HomeMy WebLinkAboutMASON STREET INFRASTRUCTURE PROJECT - FDP230016 - SUBMITTAL DOCUMENTS - ROUND 6 - Stormwater Management Plan’
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STORMWATER’MANAGEMENT’PLAN’
.ASON STREET INFRASTRUCTURE
FORT COLLINS, COLORADO
.arch 12, 2024
Project Number: 1971-001
NORTHERNENGINEERING.COM
970.221.4158’
FORT COLLINS
GREELEY
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March’12,’2024’
City’of’Fort’Collins’
Stormwater’Development’Review’
700’Wood’Street’
Fort’Collins,’CO’’80521’
RE: STOR.WATER .ANAGE.ENT PLAN
.ASON STREET INFRASTRUCTURE
To’Whom’It’May’Concern:’
Northern’Engineering’Services,’Inc.’is’pleased’to’submit’this’Stormwater’Management’Plan’for’the’Mason’Street’
Infrastructure’project.’This’report’outlines’Best’Management’Practices’(BMPs)’to’be’implemented’with’the’
proposed’construction’to’minimize’potential’pollutants’in’stormwater’discharges.’’
We’have’prepared’this’report’to’accompany’the’Colorado’Department’of’Public’Health’and’Environment’
General’Permit’for’Stormwater’Discharge’Associated’with’Construction’Activities’(aka,’Stormwater’Discharge’
Permit’or’SDP).’The’General’Permit’No.’for’this’SDP’is’(to’be’filled-in’by’permittee),’and’the’Certification’No.’for’
this’SDP’is’(to’be’filled-in’by’permittee).’The’Permit’Certification’is’effective’beginning’(to’be’filled-in’by’
permittee),’and’initial’certification’expires’(to’be’filled-in’by’permittee).’A’copy’of’the’issuance’cover’letter’can’
be’found’in’Appendix’D’of’this’document’(to’be’filled-in’by’permittee).’
Please’note’this’Stormwater’Management’plan’(including’the’Site’Maps)’is’not’a’static’document.’It’is’a’dynamic’
device’that’should’be’kept’current’and’logged’as’construction’occurs.’As’such,’this’version’was’prepared’to’
facilitate’initial’plan’approvals’and’permits’but’does’not’necessarily’reflect’the’final’version’or’the’transitions’
throughout’the’construction’process.’As’the’site’develops’and’changes,’the’contractor’is’expected’and’
encouraged’to’change’the’content,’so’the’SWMP’works’as’effectively’and’efficiently’as’possible.’It’shall’be’the’
responsibility’of’the’SWMP’Administrator’and/or’the’permit’holder’(or’applicant’thereof)’to’ensure’the’plan’is’
properly’maintained’and’followed.’
If’you’should’have’any’questions’or’comments’as’you’review’this’report,’please’feel’free’to’contact’us’at’your’
convenience.’
Sincerely,’
NORTHERN ENGINEERING SERVICES, INC.
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.AKSY. .OKVYTS, EI BLAINE .ATHISEN, PE
Project’Engineer’’’’’’’’’’’’’’’’’’’’’’’’’’’Project’Engineer’’’
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TABLE OF CONTENTS
1.0 PROJECT DESCRIPTIONS AND NATURE OF CONSTRUCTION ..............................................1
1.1 EXISTING’SITE’DESCRIPTION’..................................................................................................................’1
1.2 NATURE’OF’CONSTRUCTION’ACTIVITY’...................................................................................................’1
1.3 SITE’DISTURBANCE’.................................................................................................................................’2
1.4 EXISTING’TOPOGRAPHIC’AND’SOIL’DATA’..............................................................................................’2
1.5 RECEIVING’WATERS’.................................................................................................................................’2
1.6 EXISTING’SITE’CONDITIONS’AND’VEGETATION’......................................................................................’2
1.7 EXISTING’GROUNDWATER’.......................................................................................................................’3
1.8 EXISTING’GROUND’CONTAMINATION’.....................................................................................................’3
2.0 PROPOSED CONSTRUCTION ACTIVITIES .........................................................................3
2.1 SEQUENCE’OF’MAJOR’ACTIVITIES’..........................................................................................................’3
3.0 GENERAL REQUIRE.ENTS ............................................................................................3
3.1 OBJECTIVES’.............................................................................................................................................’3
3.2 SMWP’AVAILABILITY.................................................................................................................................’4
3.3 DEFINITIONS’............................................................................................................................................’4
3.4 ADDITIONAL’PERMITTING’.......................................................................................................................’4
4.0 ENVIRON.ENTAL I.PACT ............................................................................................4
5.0 POTENTIAL POLLUTION SOURCES .................................................................................4
5.1 DISTURBED’AND’STORED’SOILS’.............................................................................................................’5
5.2 VEHICLE’TRACKING’OF’SEDIMENT’..........................................................................................................’5
5.3 MANAGEMENT’OF’CONTAMINATED’SOILS’..............................................................................................’6
5.4 LOADING’AND’UNLOADING’OPERATIONS...............................................................................................’6
5.5 OUTDOOR’STORAGE’OF’CONSTRUCTION’SITE’MATERIALS,’BUILDING’MATERIALS,’CHEMICALS,’ETC.
..................................................................................................................................................................’6
5.6 BULK’STORAGE’OF’MATERIALS’...............................................................................................................’6
5.7 VEHICLE’AND’EQUIPMENT’MAINTENANCE’AND’FUELING’......................................................................’7
5.8 SIGNIFICANT’DUST’OR’PARTICULATE’GENERATING’PROCESSES’.........................................................’7
5.9 ROUTING’MAINTENANCE’ACTIVITIES’INVOLVING’FERTILIZER,’PESTICIDES,’DETERGENTS,’FUELS,’
SOLVENTS,’OILS’......................................................................................................................................’7
5.10 ON-SITE’WASTE’MANAGEMENT’PRACTICES’...........................................................................................’8
5.11 CONCRETE’TRUCK/EQUIPMENT’WASHING’............................................................................................’8
5.12 DEDICATED’ASPHALT’AND’CONCRETE’BATCH’PLANTS’.........................................................................’8
5.13 NON-INDUSTRIAL’WASTE’SOURCES’SUCH’AS’WORKER’TRASH’AND’PORTABLE’TOILETS’...................’9
5.14 SAW’CUTTING’AND’GRINDING’.................................................................................................................’9
5.15 MATERIAL’HANDLING’AND’SPILL’PREVENTION’....................................................................................’10
5.16 NON-STORMWATER’DISCHARGES,’INCLUDING’CONSTRUCTION’DEWATERING’NOT’COVERED’
UNDER’THE’CONSTRUCTION’DEWATERING’DISCHARGES’GENERAL’PERMIT’AND’WASH’WATER’THAT’
MAY’CONTRIBUTE’TO’POLLUTANTS’TO’THE’MS4’................................................................................’10
6.0 STOR.WATER .ANAGE.ENT CONTROLS ..................................................................... 11
6.1 SWMP’ADMINISTRATOR.........................................................................................................................’11
6.2 OWNER’INFORMATION’..........................................................................................................................’11
6.3 BEST’MANAGEMENT’PRACTICES’(BMPS)’FOR’STORMWATER’POLLUTION’PREVENTION’...................’11
6.4 STRUCTURAL’PRACTICES’FOR’EROSION’AND’SEDIMENT’CONTROL’...................................................’12
6.5 NON-STRUCTURAL’PRACTICES’FOR’EROSION’AND’SEDIMENT’CONTROL’..........................................’14
6.6 PHASED’BMP’INSTALLATION’................................................................................................................’16
6.7 BMP’INSPECTION’...................................................................................................................................’17
6.8 BMP’MAINTENANCE’...............................................................................................................................’18
6.9 RECORD’KEEPING’..................................................................................................................................’18
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TABLE OF CONTENTS
7.0 FINAL STABILIZATION AND LONG-TER. STOR.WATER .ANAGE.ENT ............................. 19
7.1 FINAL’STABILIZATION’............................................................................................................................’19
7.2 LONG-TERM’STORMWATER’MANAGEMENT’..........................................................................................’20
8.0 ADDITIONAL SW.P AND B.P RESOURCES .................................................................... 20
9.0 REFERENCES ............................................................................................................ 20
FIGURES AND TABLES
FIGURE’1’–’VICINITY’MAP....................................................................................................................................’1
TABLE’2’–’PRELIMINARY’PERMIT’AND’CONSTRUCTION’SCHEDULE’...............................................................’17
TABLE’3’-’NATIVE’GRASS’SEED’MIX’..................................................................................................................’19
APPENDICES
APPENDIX’A’–’SITE’MAPS’
APPENDIX’B’–’’EROSION’CONTROL’DETAILS’
APPENDIX’C’–’LANDSCAPE’PLAN’
APPENDIX’D’–’COPIES’OF’PERMITS/APPLICATIONS’
APPENDIX’E’–’INSPECTION’LOGS’
APPENDIX’F’–’CONTRACTOR’INSERTS’(AS’NEEDED)’
APPENDIX’G’–’CONTRACTOR’INSERTS’(AS’NEEDED)’
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1.0 PROJECT DESCRIPTIONS AND NATURE OF CONSTRUCTION
1.1 EXISTING SITE DESCRIPTION
A’tract’of’land’located’in’the’Northeast’quarter’of’Section’2,’Township’7’North,’Range’69’West’of’the’6th’
P.M.,’City’of’Fort’Collins,’County’of’Larimer,’State’of’Colorado.’More’specifically’it’is’13.45-acres’of’land’
situated’around’N’Mason’Street’and’Hibdon’Court.’
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1.2 NATURE OF CONSTRUCTION ACTIVITY
The’site’is’situated’around’N’Mason’Street’and’Hibdon’Court’and’will’establish’several’lots’for’future’
development.’The’proposed’development’is’comprised’of’three’lots’(Lot’1,’Lot’2’and’Lot’3),’Mason’
Street’widening’and’right’of’way’dedication,’Lot’1’will’be’used’as’a’regional’detention’pond’known’as’
“Hickory’Detention’Pond”’which’will’be’owned’and’maintained’by’the’City’of’Fort’Collins.’Lots’2’and’3’
are’zoned’as’commercial’lots’and’will’be’developed’in’the’future.’Each’lot’is’responsible’for’providing’
water’quality’treatment’and’Low’impact’development’(LID)’per’the’Fort’Collins’Stormwater’Criteria’
Manual.’This’development’will’provide’the’interim’condition’for’the’Hickory’Regional’Detention’Pond.’
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Figure 1 – Vicinity .ap
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1.3 SITE DISTURBANCE
The’site’disturbance’will’occur’across’roughly’11.35’acres.’It’is’recommended’that’existing’site’condition’
photos’be’taken’prior’to’the’demolition.’
CALCULATIONS CHART
TOTAL DISTURBED PROJECT AREA 11.35 ACRES
TOTAL "ONSITE" AREA OF DISTURBANCE 11.09 ACRES
TOTAL "OFFSITE" AREA OF DISTURBANCE 0.26 ACRES
TOTAL STORAGE/STAGING AREA 0.2 (EST.) ACRES
TOTAL HAUL ROADS AREA N/A
CONSTRUCTION VEHICLE TRAFFIC AREA N/A
EST. PERCENT OF PROJECT AREA EXPOSED 0%
EST. PERCENT VEGETATIVE COVER ~90% DENSITY
EXISTING SOIL TYPE C
APPROX. GROUNDWATER DEPTH 8 FEET
NUMBER OF PHASES W/ PROJECT N/A
TOTAL VOLUME OF IMPORTED (+) / EXPORTED (-) MATERIALS (-)3418 CUB.
YD.
TOTAL AREA OF STOCKPILING OF FILL OR BORROW AREAS OFF SITE N/A SQ.
FEET
STEEPEST SLOPE 4:1 H:V
DISTANCE FROM A RIPARIAN AREA OR SENSITIVE AREA N/A FEET
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1.4 EXISTING TOPOGRAPHIC AND SOIL DATA
In’order’to’complete’the’associated’construction’plans,’a’topographical’survey’of’the’site’was’
completed.’’This’survey’consisted’of’field’measurements’made’by’Northern’Engineering’Services’in’April’
2019,’with’an’additional’survey’obtained’in’October’2022.’’
A’NRCS’Custom’Soil’Resource’Report’of’the’property’indicates’that’the’soil’on’site’is’composed’of’Nunn’
and’Caruso’clay’loam’with’slopes’of’0’–’1’percent.’’Nunn’clay’loam’is’considered’well’drained’and’is’
hydrologic’Soil’Group’C.’Caruso’clay’loam’is’considered’somewhat’poorly’drained’and’is’hydrologic’Soil’
Group’D.’
NRCS’indicates’a’wind’erodibility’rating’of’6’(of’a’scale’of’1’to’8,’1’is’most’susceptible’to’erosion),’and’as’
such’this’site’does’not’have’a’high’potential’for’wind’erosion.’’NRCS’indicates’an’erosion’factor,’K,’of’
0.32’(range’of’0.02-0.69,’0.69’being’more’susceptible’to’sheet’and’rill’erosion).’’As’such,’this’site’has’a’
moderate’susceptibility’to’sheet’and’rill’erosion.’
1.5 RECEIVING WATERS
The’project’site’is’the’regional’drainage’point’for’several’upstream’properties.’There’is’an’existing’
detention’pond’located’on’the’Fort’Collins’property’that’is’the’drainage’point’for’the’offsite’basins’to’the’
north.’The’outfall’for’the’detention’pond’is’conveyed’through’an’8”’PVC’pipe’to’the’east’side’of’Mason’
Street’to’an’existing’roadside’ditch’and’conveyed’to’College’Ave.’The’existing’storm’drain’is’currently’
blocked’and’does’not’connect’to’the’storm’infrastructure’in’College’Ave.’Storm’runoff’collects’in’the’
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offsite’storm’drain’and’spills’into’College’Ave’from’two’offsite’inlets’in’the’property’east’of’the’project’
site.’The’Mason’Street’Infrastructure’project’will’maintain’historical’drainage’patterns’by’routing’runoff’
to’College’Ave’and’repairing’the’connection’to’the’existing’infrastructure’in’College’Ave.’The’ultimate’
outfall’for’this’site’is’the’Cache’La’Poudre’River.’
1.6 EXISTING SITE CONDITIONS AND VEGETATION
The’site’is’currently’vacant’with’native’grasses’and’some’tree’cover.’N’Mason’Street’exists’as’a’roughly’
20’’wide’asphalt’road.’The’vacant’land’is’adjoined’by’some’commercial’and’manufacturing’buildings’to’
the’south,’single-family’residential’homes’to’the’west,’Mason’Street’to’the’east,’and’additional’vacant’
land’with’single-family’residences’to’the’north.’
There’is’not’a’significant’amount’of’grade’change’on’the’site.’
The’existing’site’vegetation’consists’of’native’grasses’and’trees.’’It’is’highly’recommended’that’pre-
construction’photos’be’taken’to’clearly’document’vegetative’conditions’prior’to’any’disturbance’
activities.’
1.7 EXISTING GROUNDWATER
Groundwater’depth’was’measured’onsite’in’August’of’2022’by’CTL’Thompson’while’drilling’bores’at’
various’locations’spread’throughout’the’property’(see’attached’Subsurface’Exploration’Report).’At’the’
time’of’measurement’(August’31,’2022),’groundwater’ranged’from’8’’to’11’’below’existing’elevations.’’
1.8 EXISTING GROUND CONTA.INATION
No’existing’groundwater’contamination’has’been’identified’at’this’time.’
2.0 PROPOSED CONSTRUCTION ACTIVITIES
2.1 SEQUENCE OF .AJOR ACTIVITIES
To’complete’the’project,’many’basic’categories’of’construction’activity’will’take’place.’’The’first’part’will’
be’the’removal’of’the’existing’concrete’and’asphalt’pavement’within’the’construction’limits’of’the’
existing’N’Mason’Street’for’utility’connections.’Once’the’existing’pavements’marked’for’demo’have’been’
removed’and’utilities’have’been’tied’into’existing’systems,’the’topsoil’and’native’grasses’that’are’
currently’on-site’will’be’removed.’Following’topsoil’stripping,’rough’grading’of’N’Mason’Street’and’
Hickory’Regional’Detention’Pond’will’occur.’’Next,’is’utility’installation’including’sanitary’sewer,’water’
main’and’storm’sewer.’’New’curb/gutter,’paving,’and’sidewalks’are’expected’to’begin’after’the’grading’
of’N’Mason’Street’subgrade’is’complete.’’The’final’stages’of’site’construction’will’be’fine’grading’of’the’
areas’mentioned’above,’and’the’installation’of’landscaping/seeding’throughout’the’project.’’The’
sequencing’is’an’initial’best’guess’and’is’subject’to’change’at’the’Contractor’s’discretion.’
3.0 GENERAL REQUIRE.ENTS
3.1 OBJECTIVES
The’objective’of’a’Stormwater’Management’Plan’(SWMP)’is’to’identify’all’potential’sources’of’pollution’
likely’to’occur’as’a’result’of’construction’activity’associated’with’the’site’construction’and’to’describe’
the’practices’that’will’be’used’to’reduce’the’pollutants’in’stormwater’discharges’from’the’site.’’The’
SWMP’must’be’completed’and’implemented’at’the’time’the’project’breaks’ground’and’revised’as’
necessary’as’construction’proceeds’to’accurately’reflect’the’conditions’and’practices’at’the’site.’’’’
This’report’summarizes’the’Stormwater’Management’Plan’for’the’construction’activity’that’will’occur’
with’The’Mason’Street’Infrastructure’Project’in’Fort’Collins,’CO.’’This’plan’has’been’prepared’according’
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to’regulations’of’the’Colorado’Department’of’Public’Health’and’Environment’(CDPHE),’Water’Quality’
Control’Division.’’This’report’has’been’provided’to’meet’the’requirements’of’the’City’of’Fort’Collins’
Municipal’Code’§26-498’on’water’quality’control.’
3.2 S.WP AVAILABILITY
This’report’is’intended’to’remain’on’the’construction’site’to’allow’for’maintenance’and’inspection’
updates’and’for’review’during’inspection.’
3.3 DEFINITIONS
BMP’–’Best’Management’Practice’encompassing’a’wide’range’of’erosion’and’sediment’control’practices,’
both’structural’and’non-structural’in’nature,’intended’to’reduce’or’eliminate’any’possible’water’quality’
impacts’from’stormwater’leaving’a’construction’site.’
Erosion’Control’BMPs’–’Practices’that’PREVENT’the’erosion’of’soil,’such’as’minimizing’the’amount’of’
disturbed’area’through’phasing,’temporary’stabilization,’and’preserving’existing’vegetation.’
Sediment’Control’’BMPs’–’Practices’to’REMOVE’sediment’from’run-off,’such’as’sediment’basins,’silt’
fence,’or’inlet’protection.’
Non-structural’’BMPs’–’The’implementation’of’methods,’practices,’and’procedures’to’minimize’water’
quality’impacts,’such’as’the’preservation’of’natural’vegetation,’preventive’maintenance,’and’spill’
response’procedures.’
Structural’’BMPs’–’Physical’devices’that’prevent’or’minimize’water’quality’impacts,’such’as’sediment’
basins,’inlet’protection,’or’silt’fence.’
3.4 ADDITIONAL PER.ITTING
As’mentioned’above,’this’Stormwater’Management’Plan’is’associated’with’the’Colorado’Department’of’
Public’Health’and’Environment’Stormwater’Permit’that’is’issued’by’the’Water’Quality’Control’Division’of’
the’CDPHE.’’Additional’Environmental’permitting’not’described’in’this’report’may’be’required’as’a’part’
of’this’project.’’An’example’is’the’Construction’Dewatering’Permit’for’groundwater.’’Another’example’is’
the’Air’Pollution’Emission’Notice’(APEN).’’The’CDPHE’website’contains’links’to’both’of’these’permits,’as’
well’as’many’other’potential’permits.’The’Contractor’is’responsible’for’ensuring’the’proper’permits’are’
acquired.’’’
4.0 ENVIRON.ENTAL I.PACT
There’are’no’known’environmental’impacts’to’endangered’species’or’other’environmentally’sensitive’
features’that’have’been’identified’in’this’project’area.’’’
5.0 POTENTIAL POLLUTION SOURCES
As’is’typical’with’most’construction’sites,’there’are’several’potential’pollution’sources’that’could’affect’
water’quality.’It’is’not’possible’for’this’report’to’identify’all’materials’used’or’stored’on’the’construction’
site.’It’is’the’sole’responsibility’of’the’contractor’to’identify’and’properly’handle’all’materials’that’are’
potential’pollution’sources.’Likely’pollution’sources’are’marked’“YES,”’unlikely’pollution’sources’are’
marked’“NO.”’Detailed’descriptions’of’each’source’are’also’provided’for’additional’reference.’Please’
note’that’not’all’items’with’a’detailed’description’are’present’in’the’project,’and’there’could’be’
additional’pollution’sources’that’are’not’listed’that’must’be’addressed’by’the’Contractor.’
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NO’-’Disturbed’and’stored’soils’’
YES’-’Vehicle’tracking’of’soils’and’sediment’’
NO’-’Management’of’contaminated’soils’’
YES’-’Loading’and’unloading’operations’’
NO’-’Outdoor’storage’of’construction’site’materials,’building’materials,’fertilizers,’chemicals,’etc.’’
NO’-’Bulk’Storage’of’Materials’
YES’-’Vehicle’and’equipment’maintenance’and’fueling’
YES’-’Significant’dust’or’particulate’generating’processes’
NO’-’Routine’maintenance’activities’involving’fertilizers,’pesticides,’detergents,’fuels,’solvents,’oils,’
etc.’
YES’-’On-site’waste’management’practices’(waste’piles,’dumpsters,’etc.)’
YES’-’Concrete’truck/equipment’washing’
NO’-’Dedicated’asphalt’and’concrete’batch’plants’
YES’-’Non-industrial’waste’sources,’such’as’worker’trash’and’portable’toilets’
YES’-’Saw’Cutting’and’Grinding’’
NO’-’Material’Handling’and’Spill’Prevention’
NO’-’Non-Stormwater’Discharges’including’construction’dewatering’not’covered’under’the’
Construction’Dewatering’Discharges’general’permit’and’wash’water’that’may’contribute’to’
pollutants’to’the’MS4’
5.1 DISTURBED AND STORED SOILS
Approximately’11.35’acres’of’the’site’will’be’disturbed’with’the’construction’activities.’Once’soils’have’
been’disturbed,’they’do’not’retain’the’same’compaction’as’in’their’native’state,’therefore’surface’runoff’
can’cause’more’soil’erosion’than’was’historically’observed.’In’the’event’that’these’erosion’control’
practices’do’not’keep’sediment’on’site’a’structural’barrier’(silt’fence)’will’be’used’and’is’called’out’for’on’
the’perimeter.’If’soil’manages’to’migrate’from’the’disturbed’areas’onto’the’hard’surfaces,’it’will’be’
swept’or’scraped’(street’sweeping)’to’prevent’the’migration’of’sediment.’In’case’that’sediment’is’
washed’away’too’quickly’the’curb’inlets’will’need’protection’(rock’sock’style’inlet’protection).’’
Soil’stockpiles’are’expected’on’this’site.’’Stockpiles’in’the’same’respect’do’not’retain’the’same’
compaction’and’are’more’susceptible’to’soil’erosion.’Stockpiles’on’this’site’shall’be’placed’in’or’near’the’
center’of’the’site’and’away’from’any’drainage’swales’to’not’require’perimeter’run’off’controls’
(Materials/Site’Management’Control).’The’stock’pile’will’be’kept’loose,’not’compacted,’and’watered’as’
needed’to’prevent’dust’issues’(site’watering).’The’stockpile’will’be’monitored’for’signs’of’erosion’
displacement’and’sediment’accumulation’and’if’conditions’warrant’it,’the’stockpile’will’be’structurally’
covered’or’if’it’is’going’to’sit’a’long’while’will’be’reseeded’(temporary’seeding).’
5.2 VEHICLE TRACKING OF SEDI.ENT
Vehicle’tracking’of’sediment’may’occur’throughout’the’construction’process’and’along’all’areas’where’
the’pavement’meets’the’disturbed’dirt.’This’occurs’most’often’after’any’melt’off’or’rain’conditions’when’
mud’collects’on’vehicles’tires’and’is’tracked’out’onto’the’road’consequently’leaving’the’site.’This’
increases’the’possibility’of’sediment’discharging’to’the’storm’system.’To’prevent’tracking,’access’to’the’
site’will’be’limited’to’construction’entrances’(vehicle’tracking’pads’to’be’installed)’on’the’northeast’side’
of’the’site’and’southeast’side’of’the’site.’Vehicle’access’will’be’limited’on’muddy’days’(site’management’
control),’in’this’case’parking’will’be’kept’to’the’stabilized’staging’area.’The’tracking’pad’will’be’
monitored’visually’every’day’and’if’track-out’becomes’a’significant’problem’a’larger’or’more’robust’
tracking’pad’may’be’installed.’Otherwise,’all’track-out’that’reaches’the’street’will’be’scraped’and’swept’
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(street’sweeping).’Secondary’controls’at’the’closest’affected’inlets’will’have’protection’(inlet’protection)’
to’capture’sediment’not’swept’up’in’a’timely’manner.’
Additional’measures’can’be’taken’to’minimize’and’control’sediment’discharges’from’the’site’due’to’
vehicle’tracking.’These’measures’can’include’fencing’around’the’site’to’control’access’points.’’The’use’of’
gravel’parking’areas’and’wash’racks’can’also’be’implemented’to’ensure’minimal’vehicle’tracking’from’
the’site.’
5.3 .ANAGE.ENT OF CONTA.INATED SOILS
All’data’about’the’site’shows’that’there’is’no’known’contamination’on’the’site.’If’encountered,’the’
contractor’will’have’the’material’stored’in’a’covered’area’(materials’management’control)’as’to’not’mix’
with’the’stormwater’until’the’material’can’be’identified’and’proper’classification’and’disposal’methods’
can’be’determined’in’accordance’with’the’various’waste’laws’as’well’as’with’good’construction’safety’
and’practices.’
5.4 LOADING AND UNLOADING OPERATIONS
During’this’project’there’will’be’a’diverse’amount’of’loading’and’unloading.’The’foundation’workers’will’
have’to’deliver’forms’to’the’site’and’deliver’premixed’concrete.’Landscapers’will’have’to’pile’the’
materials’on’site’to’complete’the’landscape’work.’Though’the’loading’and’unloading’vehicles’will’
contribute’to’the’track’out’of’materials,’depending’on’the’material’being’delivered’to’the’site’they’may’
have’a’significant’spill’potential.’Where’trailers’must’access’the’site,’an’attempt’will’be’made’to’keep’the’
vehicles’on’the’VTC’or’other’stabilized’storage’areas.’When’loading’and’unloading’is’occurring,’
depending’on’the’materials,’there’may’be’an’increased’problem’of’containers’being’dropped,’
punctured,’or’broken.’These’off-loading’activities’will’be’located’away’from’storm’drains’and’will’have’
nearby’spill’kits’accessible.’Spills’on’site’will’be’addressed’using’spill’prevention’and’response’
procedures.’
5.5 OUTDOOR STORAGE OF CONSTRUCTION SITE .ATERIALS, BUILDING .ATERIALS,
CHE.ICALS, ETC.
It’is’anticipated’that’inert’materials’like’wood,’tiles,’and’stone’will’be’stored’on’site’and’outside’in’the’
elements.’It’is’also’anticipated’that’materials’that’do’not’weather’well’(cement,’mortar,’etc.)’will’also’be’
located’outside.’Chemicals’are’not’anticipated’to’be’left’outside.’As’the’inert’materials’have’a’lower’
potential’to’leave’the’site’they’should’be’monitored’during’inspection’to’make’sure’they’are’not’being’
impacted’by’the’exposure’to’the’elements’(site’management’control).’The’materials’that’will’need’
added’attention’are’the’cements’and’mortars’as’they’quickly’mix’with’water’and’cause’pollution’issues.’
These’materials’when’not’stored’inside’will’be’placed’on’pallets’to’get’above’potential’surface’runoff’
and’covered’with’tarps’or’plastic’to’prevent’mixing’with’stormwater’(materials’management’control).’
Very’small’quantities’of’chemical’are’needed’to’contaminate’stormwater’so’the’fertilizers,’paints,’form’
oils,’petroleum’products,’and’other’typical’chemicals,’will’be’stored’in’the’construction’connex’box,’
trailers,’vehicles,’or’the’like,’out’of’contact’with’precipitation’(materials’management’control).’If’not’
stored’in’a’location’as’described,’secondary’containment’will’be’required.’The’contractor’shall’clearly’
designate’site’areas’for’staging’and’storage’of’building’materials.’’
5.6 BULK STORAGE OF .ATERIALS
This’site’is’not’expected’to’store’bulk’liquid’chemicals’of’more’than’55’gallon’drums.’’If’this’site’does’
have’the’need’to’store’liquid’chemicals’the’following’procedure’should’be’followed.’
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These’materials’should’be’stored’in’an’area’that’if’a’rupture’would’occur,’would’be’contained.’’The’area’
will’need’to’be’located’away’from’the’drainage’areas’and’area’inlets’(site’management’/’materials’
management).’The’containers’will’be’stored’in’secondary’containment’area’with’a’silt’fence’so’that’if’a’
spill’were’to’happen,’it’would’pool’in’the’bottom’of’the’area’and’be’contained.’
5.7 VEHICLE AND EQUIP.ENT .AINTENANCE AND FUELING
Based’on’the’size’of’the’site’and’the’duration’of’activities’vehicle’fueling’and’vehicle’maintenance’is’
highly’likely.’As’fueling’and’equipment’maintenance’usually’results’in’small’spills’of’petroleum’products’
it’is’important’to’monitor’these’activities’carefully.’(site’management’control)’Some’grading’companies’
require’the’maintenance’of’a’broken’machine’on’site’or’will’employ’a’fuel’truck’to’fill’heavy’equipment.’
In’the’cases’where’the’vehicle’is’not’able’to’be’maintained’off’site,’these’activities’will’be’done’in’the’
least’detrimental’way’possible.’The’maintenance’and’fueling’will’be’located’as’far’from’stormwater’
features’as’possible’and’at’least’50’feet’from’the’detention’pond’(site’management/materials’
management).’The’fueling’activity’will’have’spill’materials’nearby’and’a’bucket’or’other’container’as’
well’as’a’shovel’located’nearby’to’catch’drips,’and’to’scoop’up’any’dirt’that’inadvertently’mixed’with’the’
soil’(materials’management).’That’container’will’have’a’lid’and’be’disposed’of’when’the’activity’is’
completed.’The’maintenance’work’will’be’done’on’a’tarp’or’other’material’to’prevent’the’residual’oils’
and’greases’from’mixing’with’the’dirt’(materials’management).’’A’clearly’designated’on-site’fueling’and’
maintenance’area’is’suggested.’
5.8 SIGNIFICANT DUST OR PARTICULATE GENERATING PROCESSES
This’project’will’result’in’earth’moving’activities,’street’sweeping,’track-out’and’carry’out,’bulk’materials’
transport,’and’saw’cutting.’As’these’activities’will’result’in’offsite’transport’of’atmospheric’pollution’
reasonable’precautions’shall’be’taken.’The’project’will’follow’all’required’“BMPs”’articulated’in’the’
Fugitive’Dust’Manual’and’additional’BMP’s’included’during’each’of’the’identified’activities’in’accordance’
with’City’Ordinance’No.’044’2016.’A’copy’of’the’Fugitive’Dust’Control’Manual’will’also’be’kept’in’the’
trailer’during’construction’for’reference.’Such’precautions’will’include’but’not’be’limited’to’watering’the’
site,’covering’trucks,’slower’site’speeds’and’vehicle’tracking’mentioned’above.’
5.9 ROUTING .AINTENANCE ACTIVITIES INVOLVING FERTILIZER, PESTICIDES, DETERGENTS,
FUELS, SOLVENTS, OILS
Fertilizers’and’pesticides’will’be’used’during’the’later’phases’of’the’project’when’trying’to’establish’
healthy’vegetation.’These’chemicals’are’highly’water’soluble’and’are’easily’and’unnoticeably’carried’in’
the’stormwater.’Proper’application’rates’and’recommended’timing’of’application’will’be’strictly’
followed,’and’not’applied’on’days,’or’the’following’days,’when’the’weather’is’calling’for’precipitation’
(materials’management’control).’As’most’of’these’types’of’chemicals’will’be’brought’on’by’the’
landscapers,’they’will’be’required’to’keep’these’products’in’their’vehicles’until’time’of’application’and’
not’be’allowed’to’leave’these’materials’on’the’site’(site’management’control).’If’these’materials’are’
stored’on’site,’they’shall’be’kept’inside’or’outside’covered’and’above’the’ground’to’prevent’the’
materials’from’mixing’with’water’and’runoff’(materials’management’control).’Detergents,’paints,’acids,’
cement,’grout,’and’solvents’will’be’prevalent’in’the’interior’work’of’the’building’(materials’
management).’These’materials’also’are’easily’mixed’with’water’yet’are’typically’noticeable’by’
discolored,’cloudy,’or’sudsy’water.’As’such,’the’contractor’will’always’keep’an’eye’out’for’these’types’of’
differences’in’water’around’the’site’(site’management’control).’However,’these’materials’are’to’be’
handled,’operated,’and’cleaned’up’all’within’the’structure.’Where’external’use’is’concerned’these’
materials’will’be’stored’in’the’construction’connex’box,’trailers,’vehicles,’or’the’like,’out’of’contact’with’
precipitation’(materials’management).’If’not’stored’in’a’location’as’described’secondary’containment’
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will’be’required’(materials’management).’Fuels’and’oils’might’be’associated’with’the’smaller’equipment’
used’on’site;’chainsaws,’pumps,’generators,’etc.’Petroleum’products’are’easily’suspended’in’water’and’
are’spread’across’the’top’of’the’water’surface,’when’these’products’are’located’in’water’it’will’have’a’
rainbow’sheen.’They’are’also’monitored’during’construction’(site’management’controls).’These’
products’will’be’stored’in’the’construction’connex’box,’trailers,’vehicles,’or’similar’structures’that’will’
minimize’contact’with’precipitation’(materials’maintenance’controls).’If’not’stored’in’a’location’as’
described’secondary’containment’will’be’required’(materials’maintenance).’Any’untreated’runoff’from’
these’activities’can’be’detrimental’to’wildlife’if’not’cleaned’up.’
5.10 ON-SITE WASTE .ANAGE.ENT PRACTICES
All’large’and’heavy’weighted’waste’piles’(concrete’chunks,’excavated’pipes,’etc.)’will’be’kept’in’neatly’
grouped’piles’until’the’material’is’to’be’disposed’of’properly.’These’piles’will’be’stored’for’the’shortest’
duration’possible’and’will’be’kept’50’feet’from’any’drainage’course’or’inlet’(Administrative’Control).’All’
dry’waste’will’be’maintained’through’dumpsters’and’monthly’hauler’removal’(hauler’will’be’notified’if’
dumpster’becomes’full’and’hauled’off’as’needed).’Where’available’by’the’hauling’company’the’
dumpster’will’be’covered.’If’not’practical’or’available’by’the’haul’company,’an’increased’removal’
schedule’will’be’followed’and’the’“Max’fill’line”’on’the’dumpster’will’be’strictly’followed.’Corners’of’the’
dumpsters’will’be’monitored’for’“Dumpster’Juice”’leaking’into’the’soil’in’dry’conditions’and’rain/melt’
off’conditions’as’well’as’looking’for’it’mixing’with’the’runoff.’Dumpsters,’like’the’waste’piles,’will’be’
located’at’least’50’feet’from’any’drainage’course’or’inlet.’Workers’will’be’sent’around’at’the’end’of’the’
day’to’collect’trash’to’prevent’trash’being’left’out’overnight.’No’construction’debris’(including’broken’
concrete)’will’be’buried’on’site.’
5.11 CONCRETE TRUCK/EQUIP.ENT WASHING
Concrete’will’be’a’portion’of’this’project.’It’is’anticipated’that’it’will’be’used’with’the’joints’around’the’
manholes,’pour’in’place’inlets,’curb’and’gutter’installation,’sidewalks’and’culvert’construction.’Pre’
mixed’concrete’trucks’will’be’used’in’this’process’and’will’be’delivered’to’the’site’when’pouring’the’
culvert’components.’’Washing’the’concrete’equipment’will’be’required’to’maintain’the’equipment.’This’
concrete’wash’water’has’a’high’alkaline’content’which’is’hazardous’to’terrestrial’and’aquatic’wildlife.’A’
section’of’dirt’near’the’entrance’will’be’excavated’and’compacted’around’the’sides’to’retain’the’
concrete’wash’water’on’site,’as’an’acceptable’practice’by’the’State,’so’long’as’the’wash’water’is’kept’in’
the’washout’(concrete’washout).’There’will’be’a’rock’pad’for’the’truck’to’park’on’while’washing’as’to’
prevent’tracking’from’this’washout’(VTC).’The’placement’of’this’washout’will’be’located’at’least’50’feet’
from’any’drainage’course’or’inlet.’Later’in’the’project’after’the’parking’lots’curb’and’gutter’has’been’
poured’the’use’of’a’mobile’washout’facility’will’be’used’on’site’in’a’similar’location’after’the’ground’has’
been’leveled’(concrete’washout’–’mobile).’The’contractor’(including’all’masonry’and’concrete’
tradesmen)’shall’clean’out’equipment’within’the’washout’area’so’that’the’runoff’is’not’allowed’to’leave’
the’washout.’The’only’exception’would’be’for’them’to’wash’in’the’next’day’s’pour’location.’All’concrete’
workers’will’be’made’aware’of’the’where’they’are’to’wash’(site’management’controls’&’education).’If’
there’is’a’significant’amount’of’spillage’when’the’transfer’from’concrete’truck’to’pump’truck’occurs,’a’
tarp’or’other’ground’cloth’should’be’used’to’collect’spillage’(ground’cover’control).’
5.12 DEDICATED ASPHALT AND CONCRETE BATCH PLANTS
There’will’be’no’dedicated’asphalt’or’concrete’batch’plants’erected’onsite’for’this’project.’Premixed’
concrete’and’paving’materials’will’be’delivered’to’the’site’and’placed.’
In’the’event’that’a’plant’is’needed,’the’Contractor’should’be’aware’that’additional’permitting’will’be’
required.’’In’particular’an’Air’Pollutant’Emission’Notice’(APEN)’will’need’to’be’obtained’from’the’CDPHE.’
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5.13 NON-INDUSTRIAL WASTE SOURCES SUCH AS WORKER TRASH AND PORTABLE TOILETS
Since’facilities’are’not’located’nearby’for’workers’to’use,’trash’and’sanitary’facilities’will’be’required’on’
the’site.’’
Worker’trash’will’be’combined’with’the’industrial’trash’and’will’follow’the’same’controls’with’the’caveat’
that’a’trashcan’will’be’located’near’the’entrance’of’the’site’as’the’contractor’will’need’to’dump’their’
trash’from’lunch,’etc.’and’this’will’be’emptied’weekly’or’more’frequently,’if’needed.’’Designate’trash’and’
bulk’waste’collection’areas’on-site.’’Dumpsters’should’be’located’near’site’entrances’to’minimize’traffic’
on’disturbed’soils,’and’they’should’be’placed’on’a’level’soil’surface.’’When’possible,’materials’should’be’
recycled.’’Hazardous’material’waste’should’be’segregated’from’other’solid’waste.’’’
If’tipped’over’and’when’being’cleaned,’portable’toilet’facilities’become’a’potential’discharge’if’not’
properly’cleaned’up.’If’human’waste’is’spilled,’it’will’need’to’be’treated’as’a’biological’hazard’of’
untreated’sewage’and’will’need’to’be’cleaned’up’in’accordance’with’Larimer’County’Health’Department’
Guidance.’The’toilets’will’be’staked’in’a’way’to’prevent’tipping’on’a’dirt’surface’and’located’at’least’50’
feet’from’a’drainage’course’or’inlet.’If’the’site’cannot’accommodate’a’portable’toilet’on’dirt,’a’
containment’pan’or’other’secondary’containment’will’be’provided.’They’will’also’be’anchored’to’
prevent’from’tipping.’All’materials’shall’be’properly’disposed’of’in’accordance’with’the’law.’
5.14 SAW CUTTING AND GRINDING
The’trench’work’and’street’connections’will’require’cutting’into’the’city’street.’This’project’will’need’the’
use’of’hardened’saws.’These’saws’generate’a’significant’amount’of’dust.’Watering’the’cutting’surface’to’
prevent’airborne’particulates’(BMP’in’the’City’s’Fugitive’Dust’Manual)’is’required.’The’cutting’slurry’has’
a’high’content’of’fine’particulates’(Silica’Dust,’Metals,’etc.)’that’is’not’allowed’to’discharge’as’runoff’
from’the’site.’To’prevent’slurry’from’discharging’offsite,’contractors’will’use’the’minimum’amount’of’
water’needed’to’prevent’dust’and’blades’from’overheating’(site’management’control).’Cutting’slurry’
will’be’collected’via’vacuum’or’allowed’to’dry’out’and’be’scraped’and’swept’up’after’the’cutting’has’
finished’(saw’cutting).’
The’following’protocol’is’recommended’to’prevent’dust’and’slurry’from’asphalt’and’concrete’saw’
cutting’activities’from’migrating’into’the’existing’storm’drain’system.’
Slurry’and’cuttings’shall’be’vacuumed’during’cutting’and’surfacing’operations’
Slurry’and’cuttings’shall’not’remain’on’permanent’concrete’or’asphalt’pavement’overnight’
Slurry’and’cuttings’shall’not’drain’to’any’natural’or’constructed’drainage’conveyance’
Collected’slurry’and’cuttings’shall’be’disposed’of’in’a’manner’that’does’not’violate’groundwater’or’
surface’water’standards’
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5.15 .ATERIAL HANDLING AND SPILL PREVENTION
Potential’pollution’sources,’as’discussed’in’earlier’sections,’are’to’be’identified’by’the’contractor.’Spill’
prevention’procedures’are’to’be’determined’and’put’in’place’before’construction’by’the’contractor.’A’
spill’and’flooding’response’procedure’must’also’be’determined’and’put’in’place’before’construction’by’
the’contractor.’Additionally,’steps’should’be’taken’to’reduce’the’potential’for’leaks’and’spills’to’come’in’
contact’with’stormwater’run-off,’such’as’storing’and’handling’toxic’materials’in’covered’areas’or’storing’
chemicals’within’berms’or’other’secondary’containment’devices.’
A’notification’procedure’must’be’put’in’place’by’the’contractor,’by’which’workers’would’first’notify’the’
site’construction’superintendent,’who’would’then’notify’the’SWMP’Administrator.’Depending’on’the’
severity’of’the’spill,’the’site’construction’superintendent’and’SWMP’Administrator’would’possibly’notify’
the’Colorado’Department’of’Public’Health’and’Environment’-’Water’Quality’Control’Division,’
downstream’water’users,’or’other’appropriate’agencies.’The release of any chemical, oil, petroleum
product, sewage, etc., which enter waters of the State of Colorado (which include surface water,
groundwater, and dry gullies or storm sewers leading to surface water) must be reported
immediately to the Division’s emergency spill reporting line at (877) 518-5608. All’spills’requiring’
cleanup,’even’if’the’spill’is’minor’and’does’not’need’to’be’reported’to’the’State,’should’still’be’reported’
to’the’City’of’Fort’Collins’Utilities’office’at’970-221-6700.’
It’will’be’the’responsibility’of’the’Contractor’to’designate’a’fueling’area’and’take’the’necessary’
precautions’to’ensure’that’no’stormwater’pollution’occurs’in’the’event’that’a’fueling’area’is’needed.’’
Fueling’areas’shall’be’located’a’minimum’of’100’feet’from’all’drainage’courses.’’A’12-inch’high’
compacted’earthen’ridge’capable’of’retaining’potential’spills’shall’enclose’fueling’areas.’’Other’
secondary’containment’devices’can’be’used’instead’of’the’earthen’ridge.’’The’area’shall’be’covered’with’
a’non-porous’lining’to’prevent’soil’contamination.’’Printed’instructions’for’cleanup’procedures’shall’be’
posted’in’the’fueling’area’and’appropriate’fuel’absorbents’shall’be’available’along’with’containers’for’
used’absorbents’within’the’fueling’area.’
5.16 NON-STOR.WATER DISCHARGES, INCLUDING CONSTRUCTION DEWATERING NOT
COVERED UNDER THE CONSTRUCTION DEWATERING DISCHARGES GENERAL PER.IT AND
WASH WATER THAT .AY CONTRIBUTE TO POLLUTANTS TO THE .S4
The’Stormwater’Construction’Permit’only’covers’discharges’composed’entirely’of’stormwater.’’The’
discharge’of’pumped’stormwater,’ONLY,’from’excavations,’ponds,’depressions,’etc.’to’surface’waters,’or’
to’a’municipal’storm’sewer’system’is’allowed’by’the’Stormwater’Construction’Permit,’as’long’as’the’
dewatering’activity’and’associated’BMPs’are’identified’in’the’Stormwater’Management’Plan’(SWMP)’and’
are’implemented’in’accordance’with’the’SWMP.’
Aside’from’the’exceptions’noted’above,’non-stormwater’discharges’must’be’addressed’in’a’separate’
permit’issued’for’that’discharge.’’If’groundwater’is’encountered,’and’dewatering’is’required,’a’
Construction’Dewatering’Permit’must’be’acquired’from’the’Colorado’Department’of’Public’Health’and’
Environment.’’’’’
Based’upon’a’subsurface’exploration’report’done’in’2022’by’CTL’Thompson,’Inc.,’ground’water’levels’
indicate’that’it’may’be’present’during’construction’of’underground’utilities’at’8’’-’11’’deep.’If’
encountered,’dewatering’activities’may’be’required.’Groundwater’has’in’most’excavations’mixed’with’
the’dirt’and’as’they’are’pumped,’will’add’an’increased’velocity’out’of’the’out-flow’end’contributing’to’
erosion’and’speeding’up’the’transport’of’the’suspended’sediment’particles.’Also,’construction’
dewatering’activities’must’be’identified’in’the’Erosion’Control’Report’if’they’are’to’be’infiltrated’on’site.’
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If’the’material’is’anticipated’to’be’pumped’to’a’stormwater’conveyance’the’proper’Construction’
Dewatering’Permit’must’be’pulled’from’the’State’of’Colorado.’If’pumping’activities’are’to’occur’on’the’
site,’the’use’of’rock’packs’on’the’intake’end’of’the’pump’will’be’used’and’a’silt’bag’will’be’used’on’the’
outflow’end’of’the’pump’to’reduce’the’silt’and’sediment’from’leaving’the’activity’(dewatering’Control’
Measure).’If’this’will’be’under’a’Dewatering’Permit,’water’samples’will’be’collected’in’accordance’with’
that’permit.’
6.0 STOR.WATER .ANAGE.ENT CONTROLS
6.1 SW.P AD.INISTRATOR
A’SWMP’Administrator’must’be’designated’in’conjunction’with’the’Stormwater’Permit.’This’person’shall’
be’responsible’for’developing,’implementing,’maintaining,’and’revising’the’SWMP.’The’SWMP’
Administrator’will’also’be’the’contact’for’all’SWMP-related’issues’and’will’be’the’person’responsible’for’
the’accuracy,’completeness,’and’implementation’of’the’SWMP.’The’Administrator’should’be’a’person’
with’the’authority’to’adequately’manage’and’direct’day-to-day’stormwater’quality’management’
activities’at’the’site.’
The’SWMP’Administrator’for’this’site’is:’
Name:’’’’’’’(to’be’filled’in’by’permittee)’
Company:’’’’’’(to’be’filled’in’by’permittee)’
Phone:’’’’’’’(to’be’filled’in’by’permittee)’
E-mail:’’’’’’’(to’be’filled’in’by’permittee)’
6.2 OWNER INFOR.ATION
’
Name:’’Cheryl’Zimlich’
Company:’N.’College’1311’LLC’
Address:’’262’E’Mountain’Ave,’Fort’Collins,’CO’80524’
E-mail:’’’
’
6.3 BEST .ANAGE.ENT PRACTICES (B.PS) FOR STOR.WATER POLLUTION PREVENTION
Beginning’from’mobilization,’and’throughout’the’entire’construction’of’the’project,’erosion’control’
devices’shall’be’installed’to’ensure’minimal’pollutant’migration.’’These’erosion’control’devices’may’be’
installed’in’phases,’or’not’at’all,’depending’on’actual’conditions’encountered’at’the’site.’’It’is’the’
responsibility’of’the’Contractor’to’make’the’determination’as’to’what’practices’should’be’employed’and’
when.’’In’the’event’that’a’review’agency’deems’BMPs’to’be’insufficient,’it’shall’be’the’responsibility’of’
the’contractor’to’implement’modifications’as’directed.’’
Best’Management’Practices’(BMPs)’are’loosely’defined’as’a’method,’activity,’maintenance’procedure,’or’
other’management’practice’for’reducing’the’amount’of’pollution’entering’a’water’body.’’The’term’
originated’from’rules’and’regulations’in’Section’208’of’the’Clean’Water’Act.’’
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Details’for’Structural’and’Non-Structural’BMPs’have’been’included’in’Appendix’B.’’These’details’should’
be’used’for’additional’information’on’installation’and’maintenance’of’BMPs’specified’in’this’report.’’It’is’
also’intended’to’serve’as’a’resource’for’additional’BMPs’that’may’be’appropriate’for’the’site’that’have’
not’specifically’been’mentioned’in’the’report.
6.4 STRUCTURAL PRACTICES FOR EROSION AND SEDI.ENT CONTROL
Structural’BMPs’are’physical’devices’that’are’implemented’to’prevent’erosion’from’happening’or’to’limit’
erosion’once’it’occurs.’’These’devices’can’be’temporary’or’permanent,’and’installation’of’individual’
components’will’vary’depending’on’the’stage’of’construction.’’’
A’table’depicting’construction’sequence’and’BMP’application/removal’has’been’placed’on’the’“Dynamic’
Site’Plan”’to’help’document’the’implementation’of’these’BMPs.’’Refer’to’the’Stormwater’Management’
Plan’Static’Site’Plan’in’the’Appendix’for’the’assumed’location’of’all’BMPs.’’Construction’Details’for’
Temporary’BMPs’are’located’in’the’Appendix’for’reference.’
Again,’the’final’determination’for’which’BMP’s’will’be’installed,’where’they’will’be’located,’and’when’
they’will’be’installed’shall’be’made’by’the’Contractor,’along’with’all’documentation’throughout’the’
construction’process.’
Silt Fencing (Phase I)
Silt’fencing’shall’be’provided’to’prevent’migration’of’sediment’off-site’or’into’adjacent’properties.’’All’
silt’fencing’shall’be’installed’prior’to’any’land’disturbing’activity’(demolition,’stockpiling,’stripping,’
grading,’etc.).’’Silt’fencing’is’to’be’installed’prior’to’site’excavation’or’earthwork’activities.’’’
Inspections’of’the’silt’fence’should’identify’tears’or’holes’in’the’material’and’should’check’for’slumping’
fence’or’undercut’areas’that’allow’flows’to’bypass’the’fencing.’’Damaged’sections’of’the’silt’fence’
should’be’removed’to’maintain’BMP’effectiveness,’typically’before’it’reaches’a’depth’of’6’inches.’’’
It’is’suggested’that’silt’fencing’be’located’along’the’entire’property’line’west’of’and’not’including’N’
Mason’Street’with’a’diversion’around’the’trees’on’the’northern’side’of’the’property,’the’east’side’of’N’
Mason’Street,’and’the’east’side’of’the’existing’drainage’ditch’on’the’southeast’side’of’N’Mason’Street.’
Refer’to’the’Erosion’Control’Plan’(Sheet’EC1)’for’additional’clarification.’
Sediment Control Log – aka “Straw Wattles” (Phase I)
A’Sediment’Control’Log’is’a’linear’roll’made’of’natural’materials,’such’as’straw,’coconut’fiber,’or’other’
fibrous’material’trenched’into’the’ground’and’held’with’a’wooden’stake.’’Sediment’Control’Logs’can’be’
used’in’many’instances.’’Examples’include’perimeter’control’for’stockpiles,’as’part’of’inlet’protection’
designs,’as’check’dams’in’small’drainage’ways,’on’disturbed’slopes’to’shorten’flow’lengths,’or’in’lieu’of’
silt’fencing’(where’appropriate).’
Sediment’Control’Logs’should’be’inspected’for’excess’sediment’accumulation.’’Sediment’should’be’
removed’prior’to’reaching’half’the’height’of’the’log.’’’
At’a’minimum,’Sediment’Control’Logs’should’be’used’around’soil’stockpiles’(including’landscape’
material)’and’at’all’stormwater’discharge’locations’other’than’inlets.’All’proposed’landscape’swales,’
including’ones’discharging’into’detention’ponds’shall’have’a’straw’wattle’installed’perpendicular’to’flow’
every’4”’of’elevation’difference.’Refer’to’the’Erosion’Control’Plan’(Sheets’EC1’–’EC3)’for’additional’
clarification.’
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Vehicle Tracking Control Pads (Phase I)
Vehicle’tracking’control’pads’shall’be’provided’to’minimize’tracking’of’mud’and’sediment’onto’paved’
surfaces’and’neighboring’roadways.’’All’vehicle’tracking’control’pads’shall’be’installed’prior’to’any’land’
disturbing’activity’(demolition’–’as’necessary,’stockpiling,’stripping,’grading,’etc.).’’Location’of’vehicle’
tracking’control’pads’will’be’located’at’any’and’all’existing’and’future’vehicle’accesses’being’used’
during’any’of’the’construction’phases.’These’locations’will’primarily’be’dictated’by’gates’or’openings’in’
the’temporary’construction’fencing’that’is’expected’to’be’installed.’’Vehicle’tracking’control’pads’are’to’
be’installed’prior’to’demolition’(as’appropriate),’site’excavation’or’earthwork’activities.’
Vehicle’tracking’pads’should’be’inspected’for’degradation’and’aggregate’material’should’be’replaced’as’
needed.’If’the’area’becomes’clogged’with’water,’excess’sediment’should’be’removed.’’Aggregate’
material’should’remain’rough,’and’at’no’point’should’aggregate’be’allowed’to’compact’in’a’manner’that’
causes’the’tracking’pad’to’stop’working’as’intended.’
Suggested’locations’for’vehicle’tracking’pads’are’at’the’proposed’accesses’on’the’north’and’south’ends’
of’N’Mason’Street’during’all’phases’of’Erosion’Control.’’Refer’to’the’Erosion’Control’Plan’(Sheets’EC1’–’
EC3)’for’additional’clarification.’
Inlet Protection (Phase I & II)’
Inlet’protection’shall’be’provided’for’existing’inlets’to’prevent’sediment’transport’from’adjacent’
earthwork’disturbance.’’Installation’of’these’filters’shall’occur’before’adjacent’earth’disturbing’activities’
(Phase’I’implementation).’’Wattle’type’filters’are’to’be’implemented’for’new’and’existing’inlets’where’
asphalt’does’not’exist.’’For’these’inlets,’if’pavement’is’constructed’adjacent’to’the’structure’or’if’the’area’
adjacent’to’the’inlet’is’changed’such’that’the’wattle’type’filter’is’no’longer’effective,’it’shall’be’the’
responsibility’of’the’Contractor’to’ensure’that’an’appropriate’method’is’used’instead.’’For’example,’the’
wattle’filter’could’be’reused,’or’a’gravel-block’inlet’filter’may’be’installed.’’It’will’be’left’to’the’discretion’
of’the’Contractor’as’to’whether’replacement’of’any’inlet’filter’is’necessary.’’’
Inlet’protection’should’be’inspected’regularly’for’tears’that’can’result’in’sediment’entering’an’inlet.’’
Inlet’protection’should’also’be’inspected’for’sediment’accumulation’upstream’of’the’inlet,’and’sediment’
should’be’removed’when’the’less’than’half’of’the’capacity’is’available,’or’per’manufacturer’
specifications.’’’’’
Refer’to’the’Erosion’Control’Plan’(Sheets’EC1’–’EC3)’for’additional’clarification.’’’
Erosion Control Blankets (Phase II)
A’temporary’degradable’rolled’erosion’control’product’composed’of’natural’flexible’fibers’shall’be’used’
on’all’seeded’slopes’4:1’and’greater’(excluding’mulched’shrub’bed’areas).’Erosion’control’blankets’
should’be’utilized’to’provide’erosion’control’and’to’facilitate’vegetation’establishment.’’During’
installation,’it’is’important’to’ensure’that’no’gaps’or’voids’exist’under’the’material’and’that’all’corners’of’
the’material’are’secured’using’stakes’and’trenching.’Stakes’should’be’made’of’materials’that’are’
biodegradable.’’Continuous’contact’between’the’product’and’the’soil’is’necessary’to’avoid’failure.’’’
Erosion’Control’Blankets’should’be’inspected’regularly’for’signs’of’erosion,’including’beneath’the’mat.’’
If’voids’are’apparent,’they’should’be’filled’with’suitable’soil.’’Inspections’should’also’identify’loose’or’
damaged’stakes,’as’well’as’loose’portions’of’the’blanket.’’If’deficiencies’are’found,’they’should’be’
repaired’or’replaced.’
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Concrete Washout Area (Phase II)’
A’concrete’washout’should’be’provided’on’the’site.’’The’washout’can’be’lined’or’unlined’excavated’pits’
in’the’ground,’commercially’manufactured’prefabricated’containers,’or’aboveground’holding’areas.’’
The’concrete’washout’must’be’located’a’minimum’of’400’feet’from’any’natural’drainage’way’or’body’of’
water,’and’at’least’1000’feet’from’any’wells’or’drinking’water’sources.’’Washout’areas’should’not’be’
located’in’an’area’where’shallow’groundwater’may’be’present.’’Contractor’shall’clearly’show’the’desired’
location’and’access’to’the’Concrete’Washout’Area’on’the’Stormwater’Management’Plan’-’Dynamic’Site’
Plan.’’Contractor’shall’place’a’Vehicle’Tracking’Pad’if’the’selected’location’for’the’Concrete’Washout’
Area’is’detached’from’pavement.’’Clear’signage’identifying’the’concrete’washout’should’also’be’
provided.’
The’Concrete’Washout’Area’should’be’inspected’regularly.’’Particular’attention’should’be’paid’to’
signage’to’ensure’that’the’area’is’clearly’marked.’’Confirmation’that’the’washout’is’being’used’should’
also’be’noted’to’ensure’that’other’undesignated’areas’of’the’site’are’not’being’used’incorrectly’as’a’
concrete’washout.’
It’is’suggested’that’the’contractor’place’concrete’washout’areas’at’the’north’and’south’ends’of’N’Mason’
Street,’adjacent’to’the’road.’This’location’is’only’a’suggestion’and’can’be’relocated’at’the’discretion’of’
the’Contractor.’
Permanent/Established Vegetation (Phase IV)
Permanent’or’established’vegetation’and’landscaping’is’considered’a’permanent’form’of’sediment’and’
erosion’control’for’common’open’spaces,’steep’slopes’and’areas’not’exposed’to’prolonged’scour’
velocities,’or’acute’incipient’motion’bed’shear’stresses’that’will’create’soil’erosion,’rill’formation’and’
subsequent’sediment’transport.’’Areas’where’the’previous’conditions’apply’must’contain’sufficient’
permanent’BMPs,’such’as’riprap’or’cobble’mulch.’’Permanent’vegetation’shall’conform’to’the’approved’
Landscape’Plan’prepared’by’Ripley’Design.’Permanent/Established’vegetation’and’hardscape’defines’
Phase’IV’of’development.’
6.5 NON-STRUCTURAL PRACTICES FOR EROSION AND SEDI.ENT CONTROL
Non-Structural’BMPs’are’practices’or’activities’that’are’implemented’to’prevent’erosion’from’happening’
or’to’limit’erosion’once’it’occurs.’’These’BMPs’can’be’a’practice’resulting’in’physical’change’to’the’site,’
such’as’mulching’or’slope’stabilization.’’They’can’also’result’in’behavioral’changes’on’the’site,’such’as’
changes’to’construction’phasing’to’minimize’exposure’to’weather’elements,’or’increased’employee’
awareness’gained’through’training.’
Protection of Existing Vegetation (Phases I-IV)
Protection’of’existing’vegetation’on’a’construction’site’can’be’accomplished’through’installation’of’a’
construction’fence’around’the’area’requiring’protection.’’In’cases’where’up-gradient’areas’are’
disturbed,’it’may’also’be’necessary’to’install’perimeter’controls’to’minimize’sediment’loading’to’
sensitive’areas’such’as’wetlands.’’’
Trees’that’are’to’remain’after’construction’is’complete’must’be’protected.’’Most’tree’roots’grow’within’
the’top’12”-18”’of’soil,’and’soil’compaction’is’a’significant’threat’to’tree’health.’’As’such,’particular’care’
should’be’taken’to’avoid’activities’within’the’drip-line’of’the’tree.’’Direct’equipment’damage’should’also’
be’prevented.’’The’most’effective’way’to’ensure’the’health’of’trees’is’to’establish’a’protection’zone’at’
the’drip-line’of’the’tree’to’prevent’unintended’activity’in’the’area’directly’surrounding’the’tree.’’’
’
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Fencing’should’be’inspected’and’repaired’when’needed.’’If’damage’occurs’to’a’tree,’an’arborist’should’
be’consulted’on’how’to’care’for’the’tree.’’If’a’tree’is’damaged’beyond’repair,’the’City’Forester’should’be’
consulted’on’remediation’measures.’
At’a’minimum,’protect’all’trees’identified’for’retention’on’the’plans’by’Ripley’Design.’’
Stockpile .anagement (Phases I-III)
Stockpile’management’should’be’utilized’to’minimize’erosion’and’sediment’transport’from’soil’
stockpiles.’’In’general,’soil’stockpiles’should’be’located’a’minimum’of’100’feet’from’any’drainage’way’
and’50’feet’from’any’storm’sewer’inlets.’’Where’practical,’choose’a’stockpile’location’that’will’remain’
undisturbed’for’the’longest’period’of’time’as’the’phases’of’construction’progress.’’Sediment’control’
BMPs’should’be’placed’around’the’perimeter’of’the’stockpile,’and’a’designated’access’point’on’the’
upstream’side’of’the’stockpile’should’be’identified.’’BMPs’such’as’surface’roughening,’temporary’
seeding,’mulching,’erosion’control’blankets,’or’soil’binders’should’be’used’to’stabilize’the’stockpile’
surface.’
As’a’part’of’stockpile’management,’regular’inspections’of’the’perimeter’controls’should’be’completed.’’
If’BMPs’have’been’utilized’to’stabilize’the’surface’of’the’stockpile,’they’should’be’inspected’and’repaired’
as’needed.’
.ulching (Phase I-III)
Mulching’helps’reduce’erosion’by’protecting’bare’soil’from’rainfall’impact,’increasing’infiltration,’and’
reducing’runoff.’’Although’often’applied’in’conjunction’with’temporary’or’permanent’seeding,’it’can’
also’be’used’for’temporary’stabilization’of’areas’that’cannot’be’reseeded’due’to’seasonal’constraints.’’
The’most’common’type’of’mulch’used’is’hay’or’grass’that’is’crimped’into’the’soil’to’keep’it’secure.’’
However,’crimping’may’not’be’practical’on’slopes’steeper’than’three’to’one’(3H:1V).’
The’Contractor’shall’mulch’all’planted’areas’within’twenty-four’(24)’hours’after’planting.’’Only’weed-
free’and’seed-free’straw’mulch’may’be’used.’’Straw’mulch’should’be’applied’at’two’(2)’tons’per’acre,’
and’shall’be’adequately’secured’by’crimping,’tackifier,’netting’or’blankets.’’Hydraulic’mulching’may’also’
be’used’on’steep’slopes’or’where’access’is’limited.’’In’the’case’that’hydraulic’mulching’is’utilized,’the’
Contractor’shall’use’wood’cellulose’fibers’mixed’with’water’at’two’thousand’to’two’thousand’five’
hundred’(2,000-2,500)’pounds’per’acre’and’organic’tackifier’at’one’hundred’to’four’hundred’(100-400)’
pounds’per’acre.’’
The’Contractor’is’responsible’for’applying’wood’chip’mulch’to’all’planted’trees’and’shrubs’as’shown’on’
the’Landscape’Plan’prepared’by’Ripley’Design.’
Wind Erosion/Dust Control (Phase I-IV)
Wind’Erosion’and’Dust’Control’BMP’s’help’to’keep’soil’particles’from’entering’the’air’as’a’result’of’land’
disturbing’construction’activities.’’Attached’at’the’end’of’Appendix’B’is’the’Fort’Collins’Dust’Prevention’
and’Control’Manual.’The’purpose’of’this’manual’is’to’establish’minimum’requirements’consistent’with’
nationally’recognize’BMP’s’for’controlling’fugitive’dust’emissions’and’to’describe’applicable’best’
management’practices’to’prevent,’minimize,’and’mitigate’off-property’transport’or’off-vehicle’transport’
of’fugitive’dust’emissions’pursuant’to’Chapter’12,’Article’X’of’the’Fort’Collins’City’Code’(§12-150’et.’seq)’
for’specific’dust’generating’activities’and’sources.’Examples’include’use’of’a’water’truck’or’
irrigation/sprinkler’system’to’wet’the’top’layer’of’disturbed’soil,’seeding’and’mulching,’soil’binders,’or’
wind’fences.’
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Please’refer’to’the’last’three’pages’of’Appendix’B’for’the’Dust’Control’Plan.’A’Dust’Control’Plan’is’
required’for’all’development’projects’or’construction’sites’greater’than’five’(5)’acres’in’size.’
Street Sweeping (Phases I -IV)
Street’sweeping’should’be’used’to’remove’sediment’that’has’been’tracked’onto’adjacent’roadways.’
Roadways’should’be’inspected’at’least’once’a’day,’and’sediment’should’be’removed’as’needed.’A’check’
of’the’area’inlet’protection’should’be’completed’after’sweeping’to’ensure’nothing’was’displaced’during’
sweeping’operations.’Street’sweeping’can’reduce’the’sediment’washed’into’the’existing’storm’drain’
system.’Street’sweeping’may’be’necessary’on’the’existing’hardscape’areas’which’receive’runoff’from’the’
disturbed’areas.’
Good Housekeeping Practices (All phases)
Good’housekeeping’practices’that’will’prevent’pollution’associated’with’solid,’liquid,’and’hazardous’
construction-related’materials’and’wastes’should’be’implemented’throughout’the’project.’’Examples’of’
good’housekeeping’include’providing’an’appropriate’location’for’waste’management’containers,’
establishing’proper’building’material’staging’areas,’designating’paint’and’concrete’washout’areas,’
establishing’proper’equipment/vehicle’fueling’and’maintenance’practices.’’Development’of’a’spill’
prevention’and’response’plan’is’another’example’of’Good’housekeeping’practices’that’should’be’used’
on’the’project.’’The’following’items’are’detailed’examples’of’some’of’the’good’housekeeping’practices’
that’should’be’utilized’throughout’the’project.’’It’should’be’noted’that’a’complete’list’of’practices’and’
detailed’discussion’regarding’good’housekeeping’has’been’included’within’the’Potential’Pollution’
Sources’section’of’this’report.’
Street Sweeping and Vacuuming’–’Street’sweeping’and’vacuuming’should’be’used’to’remove’sediment’
that’has’been’tracked’onto’adjacent’roadways.’’Roadways’should’be’inspected’at’least’once’a’day,’and’
sediment’should’be’removed’as’needed.’’A’check’of’inlet’protection’should’be’completed’after’sweeping’
to’ensure’nothing’was’displaced’during’sweeping’operations.’’
Waste Management’–’Designate’trash’and’bulk’waste’collection’areas’on-site.’’When’possible,’materials’
should’be’recycled.’’Hazardous’material’waste’should’be’segregated’from’other’solid’waste.’’Waste’
collection’areas’should’be’located’away’from’streets,’gutters,’watercourses,’and’storm’drains.’’
Dumpsters’should’be’located’near’site’entrances’to’minimize’traffic’on’disturbed’soils,’and’they’should’
be’placed’on’a’level’soil’surface.’
Establish Proper Building Material Handling and Staging areas’–’Clearly’designate’site’areas’for’staging’
and’storage’of’building’materials.’’Provide’appropriate’BMPs’to’ensure’that’spills’or’leaks’are’contained.’
Establish Proper Equipment/Vehicle Fueling and Maintenance Practices’–’If’needed,’create’a’clearly’
designated’on-site’fueling’and’maintenance’area’that’is’clean’and’dry.’’Provide’appropriate’BMPs’to’
ensure’that’spills’or’leaks’are’contained.’
6.6 PHASED B.P INSTALLATION
It’is’important’to’recognize’the’four’(4)’major’Development’Phases’as’defined’by’the’State’of’Colorado’s’
Stormwater’Discharge’Permit’(SDP).’These’four’development’phases’(referred’to’as’Sequencing’by’the’
City’of’Fort’Collins)’have’been’distinguished’to’aid’in’the’appropriate’timing’of’installation/’
implementation’of’BMPs’at’different’stages’of’the’construction’process.’These’phases’are’described’as’
follows:’
Phase’I’–’Demolition’Stage;’BMPs’for’initial’installation’of’perimeter’controls’
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Phase’II’–’Infrastructure’Stage;’BMPs’for’utility,’paving,’and’curb’installation’
Phase’III’–’Vertical’Construction’Stage;’BMPs’for’individual’building’construction.’
Phase’IV’–’Permanent’BMPs’and’final’site’stabilization.’’
The’following’is’a’rough’estimate’of’the’anticipated’construction’sequence’for’site’improvements.’The’
schedule’outlined’below’is’subject’to’change’as’the’project’progresses’and’as’determined’by’the’General’
Contractor.’
Table 2 – Preliminary Permit and Construction Schedule
Included’in’the’back’map’pockets’are’two’Site’Plans:’a’“Static”’Site’Plan’and’a’“Dynamic”’Site’Plan.’The’
“Static”’plan’serves’to’display’the’overall’management’plan’all’at’once.’However,’proper’
implementation’of’BMPs’does’not’occur’at’once,’and’certain’BMPs’may’move’location’in’the’
construction’process;’therefore,’the’“Dynamic”’Site’Plan’is’intended’for’the’contractor’to’write’in’the’
BMP’symbols’to’document’the’location’and’time’the’BMPs’are’installed’and’maintained’throughout’the’
entire’construction’process.’
6.7 B.P INSPECTION
All’temporary’erosion’control’facilities’shall’be’inspected’at’a’minimum’of’once’every’two’(2)’weeks’and’
after’each’significant’storm’event’or’snowmelt.’Repairs’or’reconstruction’of’BMPs,’as’necessary,’shall’
occur’as’soon’as’possible’to’ensure’the’continued’performance’of’their’intended’function.’It’is’the’
responsibility’of’the’SWMP’Administrator’to’conduct’bi-weekly’inspections,’maintain’BMPs’if’needed,’
keep’records’of’site’conditions’and’inspections,’and’update’the’SWMP’as’necessary.’
The’construction’site’perimeter,’disturbed’areas,’all’applicable/installed’erosion’and’sediment’control’
measures,’and’areas’used’for’material’storage’exposed’to’precipitation’shall’be’inspected’for’evidence’
of,’or’the’potential’for,’pollutants’entering’the’drainage’system.’Erosion’and’sediment’control’measures’
identified’in’the’SWMP’shall’be’observed’to’ensure’they’are’operating’correctly.’Attention’should’be’paid’
to’areas’with’a’significant’potential’for’stormwater’pollution,’such’as’demolition’areas,’concrete’
washout’locations,’and’vehicle’entries’to’the’site.’The’inspection’must’be’documented’to’ensure’
compliance’with’the’permit’requirements.’
TASK BEGINNING
DATE ENDING DATE’"BMP-PHASE OF
DEVELOPMENT"’
Development Construction Permit
Issued by City of Fort Collins’Aug.’2024 Sep.’2025’I’
Overlot Grading (Demolition)Aug.’2024
’
Sep.’2025’
’
I’
Utility Installation’Sep.’2024 Jan.’2025 II’
Road Construction Sep’2024’March’2025 III’
Final Stabilization’April’2025’June’2025 IV’
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6.8 B.P .AINTENANCE
Any’BMPs’not’operating’in’accordance’with’the’SWMP’must’be’addressed’as’soon’as’possible,’
immediately’in’most’cases,’to’prevent’the’discharge’of’pollutants.’If’modifications’are’necessary,’such’
modifications’shall’be’documented’so’that’the’SWMP’accurately’reflects’on-site’conditions.’The SW.P
needs to accurately represent field conditions at all times.
Uncontrolled’releases’of’mud,’muddy’water,’or’measurable’amounts’of’sediment’found’offsite’will’be’
recorded’with’a’brief’explanation’of’the’measures’taken’to’clean’up’the’sediment’that’has’left’the’site,’
as’well’as’the’measures’taken’to’prevent’future’releases.’This’record’shall’be’made’available’to’the’
appropriate’public’agencies’(Colorado’Department’of’Public’Health’and’Environment,’Water’Quality’
Control’Division;’Environmental’Protection’Agency;’City’of’Fort’Collins;’etc.)’upon’request.’
Preventative’maintenance’of’all’temporary’and’permanent’erosion’control’BMPs’shall’be’provided’to’
ensure’the’continued’performance’of’their’intended’function.’Temporary’erosion’control’measures’are’
to’be’removed’after’the’site’has’been’sufficiently’stabilized,’as’determined’by’the’City’of’Fort’Collins.’
Maintenance’activities’and’actions’to’correct’problems’shall’be’noted’and’recorded’during’inspections.’
Inspection’and’maintenance’procedures’specific’to’each’BMP’identified’with’this’SWMP’are’discussed’in’
Section’3.’Details’have’also’been’included’in’Appendix’B.’
6.9 RECORD KEEPING
Documentation’of’site’inspections’must’be’maintained.’The’following’items’are’to’be’recorded’and’kept’
with’the’SWMP:’
Date’of’Inspection’
Name(s)’and’title(s)’of’personnel’making’the’inspection’
Location(s)’of’sediment’discharges’or’other’pollutants’from’the’site’
Location(s)’of’’BMPs’that’need’to’be’maintained’
Location(s)’of’’BMPs’that’failed’to’operate’as’designed’or’proved’inadequate’
Locations(s)’where’additional’’BMPs’are’needed’that’were’not’in’place’at’the’time’of’inspection’
Deviations’from’the’minimum’inspection’schedule’
Descriptions’of’corrective’action’taken’to’remedy’deficiencies’that’have’been’identified’
The’report’shall’contain’a’signed’statement’indicating’the’site’is’in’compliance’with’the’permit’to’
the’best’of’the’signer’s’knowledge’and’belief’after’corrective’actions’have’been’taken.’
Provided’within’Appendix’E’of’this’SWMP’is’an’Example’Inspection’Log’to’aid’in’the’record’keeping’of’
BMP’inspections’and’maintenance.’Photographs,’field’notebooks,’drawings,’and’maps’should’be’
included’by’the’SWMP’Administrator’when’appropriate.’
’
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In’addition’to’the’Inspection’Log,’records’should’be’kept’documenting:’
BMP’maintenance’and’operation’
Stormwater’contamination’
Contacts’with’suppliers’
Notes’on’the’need’for’and’performance’of’preventive’maintenance’and’other’repairs’
Implementation’of’specific’items’in’the’SWMP’
Training’events’(given’or’attended)’
Events’involving’materials’handling’and’storage’
Contacts’with’regulatory’agencies’and’personnel’
Notes’of’employee’activities,’contact,’notifications,’etc.’
Records’of’spills,’leaks,’or’overflows’that’result’in’the’discharge’of’pollutants’must’be’documented’and’
maintained.’A’record’of’other’spills’responded’to,’even’if’they’do’not’result’in’a’discharge’of’pollutants,’
should’be’made.’Information’that’should’be’recorded’for’all’occurrences’includes’the’time’and’date,’
weather’conditions,’reasons’for’the’spill,’etc.’Some’spills’may’need’to’be’reported’to’authorities’
immediately.’Specifically,’a’release’of’any’chemical,’oil,’petroleum’product,’sewage,’etc.,’which’may’
enter’waters’of’the’State’of’Colorado’(which’include’surface’water,’groundwater,’and’dry’gullies’or’
storm’sewers’leading’to’surface’water)’must’be’reported’to’the’CDPHE.’’
Additionally,’the’“Dynamic’Site’Plan”’is’intended’to’be’a’“living”’document’where’the’SWMP’
Administrator’can’handwrite’the’location’of’BMPs’as’they’are’installed’to’appropriately’reflect’the’
current’site’conditions.’Also,’on’the’“Dynamic’Site’Plan”’is’a’“Table’of’Construction’Sequence’and’BMP’
Application/Removal”’the’SWMP’Administrator’can’use’to’document’when’BMPs’were’installed’or’
removed’in’conjunction’with’construction’activities.’These’items’have’been’included’as’an’aid’to’the’
SWMP’Administrator,’and’other’methods’of’record’keeping’are’at’his’or’her’discretion.’
This Stormwater .anagement Plan (both the text and map) is not a static document. It is a
dynamic device intended to be kept current and logged as construction occurs. It shall be the
responsibility of the SW.P Administrator and/or the permit holder (or applicant thereof) to ensure
the plan is properly maintained and followed. Diligent administration is critical, including
processing the Notice to Proceed and noting on the Stormwater .anagement Plan the dates that
various construction activities occur and respective B.Ps are installed and/or removed.
7.0 FINAL STABILIZATION AND LONG-TER. STOR.WATER .ANAGE.ENT
7.1 FINAL STABILIZATION
Final’stabilization’of’the’site’will’be’achieved’by’either’leaving’a’gravel’surface’in’place’of’the’existing’
asphalt’roadway’or’by’reseeding.’If’reseeding’is’to’be’used,’all’disturbed’areas’will’be’seeded,’crimped,’
and’mulched’within’24’hours’of’seeding’per’the’FCDCM’Chapter’2’Section’6.1.4.9.’’
Soil’amendments’such’as’compost,’peat,’aged’manure,’or’other’similar’materials’shall’also’be’utilized.’
Soil’amendments’shall’be’tilled’into’the’soil’to’a’minimum’depth’of’6”’and’should’comply’with’the’
requirements’found’in’City’Code’Section’12-132’(also’refer’to’Land’Use’Code’3.8.21).’’
Per’the’Landscaping’Plans,’the’City’of’Fort’Collins’Upland’Mix’is’specified’everywhere’other’than’around’
the’detention’ponds.’Per’the’Landscaping’Plans,’the’City’of’Fort’Collins’Detention’Basin’Mix’is’specified.’
Please’refer’to’the’landscaping’plans’for’more’information.’’
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Non-seed’stabilization’is’expected’to’be’completed’soon’after’hardscape’construction’is’complete.’
Seeded’areas’will’require’more’time’to’establish’and’may’need’to’be’irrigated’to’establish’growth.’
As’defined’by’the’Colorado’Department’of’Public’Health’and’Environment’(CDPHE)’in’the’General’Permit’
Application’for’Stormwater’Discharges,’“Final’stabilization’is’reached’when’all’soil’disturbing’activities’
at’the’site’have’been’completed,’and’uniform’vegetative’cover’has’been’established’with’a’density’of’at’
least’70’percent’of’pre-disturbance’levels’or’equivalent’permanent,’physical’erosion’reduction’methods’
have’been’employed.”’Establishment’of’70’percent’is’required’for’a’determination’for’project’closure’by’
the’City’of’Fort’Collins.’’
7.2 LONG-TER. STOR.WATER .ANAGE.ENT
After’stabilization,’before’project’closure,’all’sediment’shall’be’removed’from’storm’piping’per’FCDCM’
Chapter’2’Section’6.1.4.9.’
All’disturbed’areas’will’receive’permanent’paving’or’be’vegetated’per’the’Landscape’Plan.’Low’Impact’
Development’(LID)’treatment’will’provide’significant’water’quality’enhancement’and’will’serve’the’long-
term’stormwater’management’goals’for’this’project.’
8.0 ADDITIONAL SW.P AND B.P RESOURCES
Mile’High’Flood’District’
Urban’Storm’Drainage’Criteria’Manual’-’Volume’3’“Best’Management’Practices”’
Colorado’Department’of’Transportation’
Erosion’Control’and’Stormwater’Quality’Guide’
BMP’Field’Academy’
EPA’Menu’of’’BMPs’
Construction’Site’Storm’Water’Runoff’Control’
International’Stormwater’Best’Management’(BMP)’Database’
Rocky’Mountain’Education’Center’
Rocky’Mountain’Education’Center’
Red’Rocks’Community’College,’Lakewood’
Keep’It’Clean’Partnership’
Boulder’
9.0 REFERENCES
1. Drainage’Report’for’Mason’Street’Infrastructure,’Northern’Engineering,’Oct’4th,’2023’(NE’Project’No.’
1971-001)’
2. City’of’Fort’Collins’Landscape’Design’Guidelines’for’Stormwater’and’Detention’Facilities,’November’5,’
2009,’BHA’Design,’Inc.’with’City’of’Fort’Collins’Utility’Services.’
3. Fort’Collins’Stormwater’Criteria’Manual,’City’of’Fort’Collins,’Colorado,’adopted’by’Ordinance’No.’174,’
2011,’and’referenced’in’Section’26-500’(c)’of’the’City’of’Fort’Collins’Municipal’Code’
4. Larimer’County’Urban’Area’Street’Standards,’Adopted’January’2,’2001,’Repealed’and’Reenacted,’
Effective’October’1,’2002,’Repealed’and’Reenacted,’Effective’April’1,’2007’
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5. Soil’Resource’Report’for’Larimer’County’Area,’Colorado,’Natural’Resources’Conservation’Service,’
United’States’Department’of’Agriculture.’
6. Urban’Storm’Drainage’Criteria’Manual,’Volumes’1-3,’Mile’High’Flood’Control’District,’Wright-
McLaughlin’Engineers,’Denver,’Colorado,’Revised’April’2008.’
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NORTHERNENGINEERING.COM | 970.221.4158 SWMP: MASON STREET INFRASTRUCTURE
FORT COLLINS | GREELEY APPENDIX
APPENDIX A
SITE MAPS
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SF SF SF SF SF
SFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSF
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HIBDON COURT
UNION PACIFIC RAILROAD
NCFS LLC
300 HICKORY STREET
FORT COLLINS, CO
QR INC.
280 HICKORY STREET
FORT COLLINS, CO QR INC.
200 HICKORY STREET
FORT COLLINS, CO
R AND S HOLDINGS
1235 N. COLLEGE AVENUE
FORT COLLINS, CO
HAINES BRANDON KUHRT 1295
N. COLLEGE AVENUE FORT
COLLINS, CO
GRATITUDE LLC
1303 N. COLLEGE AVENUE
FORT COLLINS, CO
HOYT JOHN R
1307 N. COLLEGE AVENUE
FORT COLLINS, CO
1311 N. COLLEGE LLC
HIBON CT.
FORT COLLINS, CO
1311 N. COLLEGE LLC
1311 N. COLLEGE AVENUE
FORT COLLINS, CO
WANKIER LANCE
1401 N. COLLEGE AVENUE
FORT COLLINS, CO
WOOD RONALD G/ JENNIFER
L/ WILLARD E
122 HIBDON COURT
FORT COLLINS, CO
THOMPSON PROPERTIES LLC
1319 N. COLLEGE AVENUE
FORT COLLINS, CO
D AND S MOTELS INC
1405 N. COLLEGE AVENUE
FORT COLLINS, CO
EXISTING
DITCH
10,000 SQ. FT
STABILIZED
STAGING AREA
HICKORY STREET
N
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36
CALL 2 BUSINESS DAYS IN ADVANCE BEFORE YOU
DIG, GRADE, OR EXCAVATE FOR THE MARKING OF
UNDERGROUND MEMBER UTILITIES.
CALL UTILITY NOTIFICATION CENTER OF
COLORADO
Know what'sbelow.
before you dig.Call
R
NORTH
( IN FEET )
1 inch = ft.
Feet05050
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of 42
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PROPOSED CONTOUR
PROPOSED STORM SEWER
PROPOSED SWALE
EXISTING CONTOUR
PROPOSED CURB & GUTTER
PROPERTY BOUNDARY
SILT FENCE
ROCK SOCK
SCOUR STOP
1.CONTRACTOR SHALL IMMEDIATELY STABILIZE ALL DISTURBED SLOPES BY CRIMP
MULCHING OR SIMILAR METHODS.
2.SWMP ADMINISTRATOR:
Contact ________________________________
Company ________________________________
Address ________________________________
Phone ________________________________
3.CONTRACTOR TO PROVIDE VEHICLE TRACKING CONTROL FOR CONCRETE
WASHOUT AREA IF ACCESS IS OFF PAVEMENT.
4.REFER TO THE FINAL DRAINAGE REPORT, DATED APRIL 24, 2024 BY NORTHERN
ENGINEERING FOR ADDITIONAL INFORMATION.
5.REFER TO INLET SCHEDULE ON SHEET D5 FOR CLARIFICATION OF INLET AND
BASIN TYPES.
GENERAL NOTES:
WATTLE DIKE
CONCRETE WASH AREA
SEDIMENT TRAP
BALE INLET PROTECTION
SLOPE DRAIN
LEGEND:
BALE OUTLET PROTECTION
INLET PROTECTION
VEHICLE TRACKING CONTROL PAD
SF
LIMIT OF DISTURBANCE LOD
TURF REINFORCEMENT (TMAX)
UPLAND SEED MIX
DETENTION BASIN SEED MIX
EXISTING/PROPOSED NATURAL
HABITAT BUFFER ZONE
SEED MIX LEGEND:
1.SEE LANDSCAPE PLANS FOR SEED MIXES, INSTALLATION, INSPECTION, AND
WARRANTY INFORMATION.
2.THE LOCATION OF PLANTINGS WILL NEED TO WITH VERIFIED WITH
ENVIRONMENTAL PLANNING AND STORMWATER DEPARTMENTS AT THE TIME OF
PLANTING TO VERIFY CURRENT GRADING.
3.SEE IRRIGATION PLAN FOR DETAILED IRRIGATION LAYOUT. PROVIDE TEMPORARY
IRRIGATION FOR THE ESTABLISHMENT PERIOD OF SEED MIXES.
SEED AND MULCH
IRRIGATED TURF
ROCK MULCH
TABLE OF CONSTRUCTION SEQUENCE AND BMP APPLICATION
Project: MASON STREET INFRASTRUCTURE
CONSTRUCTION PHASE MOBILIZATION DEMOLITION GRADING
BEST MANAGEMENT PRACTICES (BMPS)
STRUCTURAL "INSTALLATION"
Silt Fence Barriers *
Flow Barriers (Wattles) *
Inlet Filter Bags *
Vegetative
Temporary Seeding Planting
Mulching / Sealant
Permanent Seeding Planting
Sod Installation
Rolled Products : Netting / Blankets / Mats
Contour Furrows (Ripping / Disking)
Rock Bags *
UTILITIES
INSTALLATION
FLAT WORK
INSTALLATION LANDSCAPE DEMOBILIZATION
Vehicle Tracking Pad *
* All Temporary BMPs to be Removed once Construction is Complete
Any prior inlets that could use protecting
Any prior inlets that could use protecting
Anytime the site will sit dormant longer than 30 Days
Anytime the site will sit dormant longer than 30 Days
Anytime the site will sit dormant longer than 30 Days
Riprap
KEYMAP
CALCULATIONS CHART
TOTAL DISTURBED PROJECT AREA 11.35 ACRES
TOTAL "ONSITE" AREA OF DISTURBANCE 11.09 ACRES
TOTAL "OFFSITE" AREA OF DISTURBANCE 0.26 ACRES
TOTAL STORAGE/STAGING AREA 0.2 (EST.)ACRES
TOTAL HAUL ROADS AREA N/A
CONSTRUCTION VEHICLE TRAFFIC AREA N/A
EST. PERCENT OF PROJECT AREA EXPOSED 0%
EST. PERCENT VEGETATIVE COVER ~90%DENSITY
EXISTING SOIL TYPE C
APPROX. GROUNDWATER DEPTH 8 FEET
NUMBER OF PHASES W/ PROJECT N/A
TOTAL VOLUME OF IMPORTED (+) / EXPORTED (-) MATERIALS (-)3418 CUB. YD.
TOTAL AREA OF STOCKPILING OF FILL OR BORROW AREAS OFF SITE N/A SQ. FEET
STEEPEST SLOPE 4:1 H:V
DISTANCE FROM A RIPARIAN AREA OR SENSITIVE AREA N/A FEET
EROSION CONTROL NOTE
1.ALL MUD AND DEBRIS MUST BE KEPT OUT OF ADJACENT
ROADWAYS OR CLEANED UP IMMEDIATELY.
2.SEE EXISTING CONDITIONS AND DEMOLITION SHEET (SHEET 4)
FOR DETAILED SITE DEMOLITION.
INLET PROTECTION REQUIRED
FOR DOWNSTREAM INLETS.
(NOT SHOWN - INTERSECTION OF
HICKORY AND N COLLEGE AVE.)
FES
M
CONTROL
IRR
CONTROL
IRR
CONTROL
IRR
VAULT
F.O.
CONTROL
IRR
X
X X
X
X
X
X X
X X X X X X X
X
X
X
X
X
MW
FE S
FE S
XXXXXXXXXXXXX
X
X
X
X
X
X
X
X
X
X
D
ELEC
X
X
X
X
XX
X
X
X
X
SS
S
S
S
S
S
L
O
D
L
O
D
LOD LOD
LOD
LOD LOD LOD LOD
LODLODLODLOD
LOD
LODLOD
L
O
D
L
O
D
LO
D
LO
D
LO
D
LO
D
LO
D
LO
D
LO
D
LO
D
LO
D
LO
D
L
O
D
L
O
D
LO
D
LO
D
LODLODLODLODLODLODLODLODLODLODLODLODLODLODLO
D
LO
D
LO
D
LO
D
LO
D
LO
D
LO
D
LO
D
LO
D
LO
D
LO
D
LO
D
LO
D
LOD LOD LOD LOD LOD
LOD
LOD
LOD
LOD LOD LOD LOD LOD LOD LOD
LOD
LOD LOD LOD LOD LOD
LO
D
LODLOD
LO
D
LOD
LO
D
LO
D
LO
D
LO
D
L
O
D
L
O
D
LODLODLOD
L
O
D
LOD
LOD
L
O
D
LOD
L
O
D
L
O
D
L
O
D
L
O
D
L
O
D
L
O
D
LOD LOD LO
D
LO
D
XXX X
X
X
X
X
SS
SS
SS
SS
SS
SS
SS
8" W
X
SSSS
UDUDUDUDUDUDUD
UD
UD
UD
UD
U
D
U
D
UD
UD
UD
UD
UD
E
V
NCFS LLC
300 HICKORY STREET
FORT COLLINS, CO
QR INC.
280 HICKORY STREET
FORT COLLINS, CO
QR INC.
200 HICKORY STREET
FORT COLLINS, CO
R AND S HOLDINGS
1235 N. COLLEGE AVENUE
FORT COLLINS, CO
HAINES BRANDON KUHRT 1295
N. COLLEGE AVENUE FORT
COLLINS, CO
GRATITUDE LLC
1303 N. COLLEGE AVENUE
FORT COLLINS, CO
HOYT JOHN R
1307 N. COLLEGE AVENUE
FORT COLLINS, CO
1311 N. COLLEGE LLC
HIBON CT.
FORT COLLINS, CO
1311 N. COLLEGE LLC
1311 N. COLLEGE AVENUE
FORT COLLINS, CO
WANKIER LANCE
1401 N. COLLEGE AVENUE
FORT COLLINS, CO
WOOD RONALD G/ JENNIFER
L/ WILLARD E
122 HIBDON COURT
FORT COLLINS, CO
THOMPSON PROPERTIES LLC
1319 N. COLLEGE AVENUE
FORT COLLINS, CO
D AND S MOTELS INC
1405 N. COLLEGE AVENUE
FORT COLLINS, CO
N
M
A
S
O
N
S
T
R
E
E
T
HIBDON COURT
UNION PACIFIC RAILROAD
HICKORY REGIONAL
DETENTION POND
LOT 1
LOT 2
LOT 3
EXISTING STORM
DRAIN
EXISTING STORM
INLET
LOT LINE CURB CUT AND
SIDEWALK CHASE
2' CONCRETE
PAN
EXISTING 24"
STORM CULVERT
71' ROW
71' ROW
42'' FL-FL
42'' FL-FL
SWALE
PROPOSED NATURAL
HABITAT BUFFER ZONE
10,000 SQ. FT
STABILIZED
STAGING AREA
STORM DRAIN A
SEE SHEET 16
STORM DRAIN B
SEE SHEET 19
STORM DRAIN C
SEE SHEET 18
4222 SQ. FT. of
TMAX
1030 SQ. FT. of
TMAX
UNDERDRAIN
EMERGENCY
SPILLWAY
10
:
1
5:
1 5:
1
5:
1
4:1
5:
1
6:1
9:1
4:1
4:1
4:1
3:1
8:1
1
0
:
1
5:
1
10:
1
5:1
12:1
13:1
9:1
1.
7
%
1.
2
%
0
.
7
%
1.0%
1.0%
1.0%
0
.
9
%
1.6
%
3.
1
%
3.1%
3.
2
%
5.
4
%
2.4%
2.1%
3.2%
2.4
%
0.3
%
0
.
1
%
9.
4
%
2.1
%
2.
0
%
2.
0
%
0.6
%
HICKORY STREET
71' ROW
BY SEPARATE
DOCUMENT
N
M
A
S
O
N
S
T
R
E
E
T
SF SF SF SF SF
SFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSFSF
SF
SF
SF
SF
SF
SF
SF
SF
SF
SF
SF
SF
SF
SF SF SF SF SF
SF
SF
SF
S
F
S
F
S
F
SFSFSF
SF
SF
SFSF
S
F
S
F
S
F
SF
S
F
S
F
SF
SF
SF
SF
SF
SF
SF
EC2
ER
O
S
I
O
N
C
O
N
T
R
O
L
P
L
A
N
IN
T
E
R
I
M
37
NORTH
( IN FEET )
1 inch = ft.
Feet05050
50
100 150
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MA
S
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N
S
T
R
E
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I
N
F
R
A
S
T
R
U
C
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U
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E
CALL 2 BUSINESS DAYS IN ADVANCE BEFORE YOU
DIG, GRADE, OR EXCAVATE FOR THE MARKING OF
UNDERGROUND MEMBER UTILITIES.
CALL UTILITY NOTIFICATION CENTER OF
COLORADO
Know what'sbelow.
before you dig.Call
R
PROPOSED CONTOUR
PROPOSED STORM SEWER
PROPOSED SWALE
EXISTING CONTOUR
PROPOSED CURB & GUTTER
PROPERTY BOUNDARY
SILT FENCE
ROCK SOCK
SCOUR STOP
1.CONTRACTOR SHALL IMMEDIATELY STABILIZE ALL DISTURBED SLOPES BY CRIMP
MULCHING OR SIMILAR METHODS.
2.SWMP ADMINISTRATOR:
Contact ________________________________
Company ________________________________
Address ________________________________
Phone ________________________________
3.CONTRACTOR TO PROVIDE VEHICLE TRACKING CONTROL FOR CONCRETE
WASHOUT AREA IF ACCESS IS OFF PAVEMENT.
4.REFER TO THE FINAL DRAINAGE REPORT, DATED APRIL 24, 2024 BY NORTHERN
ENGINEERING FOR ADDITIONAL INFORMATION.
5.REFER TO INLET SCHEDULE ON SHEET D5 FOR CLARIFICATION OF INLET AND
BASIN TYPES.
GENERAL NOTES:
WATTLE DIKE
CONCRETE WASH AREA
SEDIMENT TRAP
BALE INLET PROTECTION
SLOPE DRAIN
LEGEND:
BALE OUTLET PROTECTION
INLET PROTECTION
VEHICLE TRACKING CONTROL PAD
SF
LIMIT OF DISTURBANCE LOD
TURF REINFORCEMENT (TMAX)
UPLAND SEED MIX
DETENTION BASIN SEED MIX
EXISTING/PROPOSED NATURAL
HABITAT BUFFER ZONE
SEED MIX LEGEND:
1.SEE LANDSCAPE PLANS FOR SEED MIXES, INSTALLATION, INSPECTION, AND
WARRANTY INFORMATION.
2.THE LOCATION OF PLANTINGS WILL NEED TO WITH VERIFIED WITH
ENVIRONMENTAL PLANNING AND STORMWATER DEPARTMENTS AT THE TIME OF
PLANTING TO VERIFY CURRENT GRADING.
3.SEE IRRIGATION PLAN FOR DETAILED IRRIGATION LAYOUT. PROVIDE TEMPORARY
IRRIGATION FOR THE ESTABLISHMENT PERIOD OF SEED MIXES.
SEED AND MULCH
IRRIGATED TURF
ROCK MULCH
TABLE OF CONSTRUCTION SEQUENCE AND BMP APPLICATION
Project: MASON STREET INFRASTRUCTURE
CONSTRUCTION PHASE MOBILIZATION DEMOLITION GRADING
BEST MANAGEMENT PRACTICES (BMPS)
STRUCTURAL "INSTALLATION"
Silt Fence Barriers *
Flow Barriers (Wattles) *
Inlet Filter Bags *
Vegetative
Temporary Seeding Planting
Mulching / Sealant
Permanent Seeding Planting
Sod Installation
Rolled Products : Netting / Blankets / Mats
Contour Furrows (Ripping / Disking)
Rock Bags *
UTILITIES
INSTALLATION
FLAT WORK
INSTALLATION LANDSCAPE DEMOBILIZATION
Vehicle Tracking Pad *
* All Temporary BMPs to be Removed once Construction is Complete
Any prior inlets that could use protecting
Any prior inlets that could use protecting
Anytime the site will sit dormant longer than 30 Days
Anytime the site will sit dormant longer than 30 Days
Anytime the site will sit dormant longer than 30 Days
Riprap
KEYMAP
HIBDON CT.
M
A
S
O
N
S
T
.
HICKORY ST.
CALCULATIONS CHART
TOTAL DISTURBED PROJECT AREA 11.35 ACRES
TOTAL "ONSITE" AREA OF DISTURBANCE 11.09 ACRES
TOTAL "OFFSITE" AREA OF DISTURBANCE 0.26 ACRES
TOTAL STORAGE/STAGING AREA 0.2 (EST.)ACRES
TOTAL HAUL ROADS AREA N/A
CONSTRUCTION VEHICLE TRAFFIC AREA N/A
EST. PERCENT OF PROJECT AREA EXPOSED 0%
EST. PERCENT VEGETATIVE COVER ~90%DENSITY
EXISTING SOIL TYPE C
APPROX. GROUNDWATER DEPTH 8 FEET
NUMBER OF PHASES W/ PROJECT N/A
TOTAL VOLUME OF IMPORTED (+) / EXPORTED (-) MATERIALS (-)3418 CUB. YD.
TOTAL AREA OF STOCKPILING OF FILL OR BORROW AREAS OFF SITE N/A SQ. FEET
STEEPEST SLOPE 4:1 H:V
DISTANCE FROM A RIPARIAN AREA OR SENSITIVE AREA N/A FEET
CONTRACTOR TO PROVIDE PERIMETER CONTROLS
FOR STOCKPILE AND WIND EROSION PROTECTION
UNTIL SEEDING AND MULCHING OF AREA
EROSION CONTROL NOTE
ALL MUD AND DEBRIS MUST BE KEPT OUT OF ADJACENT
ROADWAYS OR CLEANED UP IMMEDIATELY.
INLET PROTECTION REQUIRED
FOR DOWNSTREAM INLETS.
(NOT SHOWN - INTERSECTION OF
HICKORY AND N COLLEGE AVE.)
XXX X
X
X
X
X
SS
SS
SS
SS
SS
SS
SS
8" W
X
SSSS
S
ELEC
FES
M VAULT
ELEC
VAULT
ELEC
VAULT
ELEC
TRAFFIC
VAULT
CONTROL
IRR
CONTROL
IRR
CONTROL
IRR
VAULT
F.O.
CONTROL
IRR
VAULT
CABLE
VAULT
ELEC
VAULT
ELEC
VAULT
ELEC
CABLE
CABLE
CS
W
HY D
VAULT
ELEC
CELEC
ELEC
ELEC
CTV CTV CTV
OH
U
OH
U
OH
U
OH
U
E
E
E
E
E
E
E
E
E
OHU
E
E
X
X X
X
X
X
CT
V
CT
V
CT
V
CT
V
CTV
CT
V
CTV CTV CTV
OHU OHU
X X
X X X X X X X
X
X
X
X
X
CTV CTV CTV
CT
V
CTV CTV
CT
V
CTV CTV
G G
G G G G G G
CTV CTV
G G G
W
SS SS SS SS SS SS
SS
SS
SS
SS
SS
SS
MW
H2O
H2O
A R V
H2O H2O
H
Y D
S
FE S
FE S
W W W W W W W W W W W W W W W W W W W
XXXXXXXXXXXXX
OHU OHU OHU
OHU OHU
X
X
X
X
X
X
X
X
X
X
W W W W
S
S
SS
SS
SS
SS
SS
SS
SS
D
ELEC
X
X
X
X
XX
X
X
X
X
W W W W W
S
SS
S
S
S
S
W W
S
L
O
D
L
O
D
LOD LOD
LOD
LOD LOD LOD LOD
LODLODLODLOD
LOD
LODLOD
L
O
D
L
O
D
LO
D
LO
D
LO
D
LO
D
LO
D
LO
D
LO
D
LO
D
LO
D
LO
D
L
O
D
L
O
D
LO
D
LO
D
LODLODLODLODLODLODLODLODLODLODLODLODLODLODLO
D
LO
D
LO
D
LO
D
LO
D
LO
D
LO
D
LO
D
LO
D
LO
D
LO
D
LO
D
LO
D
LOD LOD LOD LOD LOD
LOD
LOD
LOD
LOD LOD LOD LOD LOD LOD LOD
LOD
LOD LOD LOD LOD LOD
LO
D
LODLOD
LO
D
LOD
LO
D
LO
D
LO
D
LO
D
L
O
D
L
O
D
LODLODLOD
L
O
D
LOD
LOD
L
O
D
LOD
L
O
D
L
O
D
L
O
D
L
O
D
L
O
D
L
O
D
LOD LOD LO
D
LO
D
UDUDUDUDUDUDUD
UD
UD
UD
UD
U
D
U
D
UD
UD
UD
UD
UD
E
V
NCFS LLC
300 HICKORY STREET
FORT COLLINS, CO
QR INC.
280 HICKORY STREET
FORT COLLINS, CO
QR INC.
200 HICKORY STREET
FORT COLLINS, CO
R AND S HOLDINGS
1235 N. COLLEGE AVENUE
FORT COLLINS, CO
HAINES BRANDON KUHRT 1295
N. COLLEGE AVENUE FORT
COLLINS, CO
GRATITUDE LLC
1303 N. COLLEGE AVENUE
FORT COLLINS, CO
HOYT JOHN R
1307 N. COLLEGE AVENUE
FORT COLLINS, CO
1311 N. COLLEGE LLC
HIBON CT.
FORT COLLINS, CO
1311 N. COLLEGE LLC
1311 N. COLLEGE AVENUE
FORT COLLINS, CO
WANKIER LANCE
1401 N. COLLEGE AVENUE
FORT COLLINS, CO
WOOD RONALD G/ JENNIFER
L/ WILLARD E
122 HIBDON COURT
FORT COLLINS, CO
THOMPSON PROPERTIES LLC
1319 N. COLLEGE AVENUE
FORT COLLINS, CO
D AND S MOTELS INC
1405 N. COLLEGE AVENUE
FORT COLLINS, CO
N
M
A
S
O
N
S
T
R
E
E
T
HIBDON COURT
UNION PACIFIC RAILROAD
HICKORY REGIONAL
DETENTION POND
LOT 1
LOT 2
LOT 3
71' ROW
71' ROW
42'' FL-FL
42'' FL-FL
15' GRAVEL
GEOGRID
ACCESS ROAD
EMERGENCY
SPILLWAY
1.0%
1.1%
0.8%
1.0%
1.1%
1.1%
5.
4
%
1.0%
2.6%
2.1%
3.0%
3.3%
1.
1
%
1.
1
%
1.
1
%
10
:
1
8:
1
5:
1
5:
1
4:1
5:
1
6:1
9:1
5:1
6:
1
5:1
9
:
1
6
:
1
5:1
12:1
13:1
9:1
1.6
%
7.6%
59:1
132:1
HICKORY STREET
71' ROW
BY SEPARATE
DOCUMENT
N
M
A
S
O
N
S
T
R
E
E
T
EXISTING STORM
DRAIN
EXISTING STORM
INLET
LOT LINE CURB CUT AND
SIDEWALK CHASE
2' CONCRETE
PAN
EXISTING 24"
STORM CULVERT
STORM DRAIN B
SEE SHEET 19
SWALE
PROPOSED NATURAL
HABITAT BUFFER ZONE
STORM DRAIN C
SEE SHEET 18
4222 SQ. FT. of
TMAX
1030 SQ. FT. of
TMAX
STORM DRAIN A
SEE SHEET 16
EC3
ER
O
S
I
O
N
C
O
N
T
R
O
L
P
L
A
N
FI
N
A
L
38
NORTH
( IN FEET )
1 inch = ft.
Feet05050
50
100 150
Sheet
Th
e
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r
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of 42
MA
S
O
N
S
T
R
E
E
T
I
N
F
R
A
S
T
R
U
C
T
U
R
E
PROPOSED CONTOUR
PROPOSED STORM SEWER
PROPOSED SWALE
EXISTING CONTOUR
PROPOSED CURB & GUTTER
PROPERTY BOUNDARY
SILT FENCE
ROCK SOCK
SCOUR STOP
1.CONTRACTOR SHALL IMMEDIATELY STABILIZE ALL DISTURBED SLOPES BY CRIMP
MULCHING OR SIMILAR METHODS.
2.SWMP ADMINISTRATOR:
Contact ________________________________
Company ________________________________
Address ________________________________
Phone ________________________________
3.CONTRACTOR TO PROVIDE VEHICLE TRACKING CONTROL FOR CONCRETE
WASHOUT AREA IF ACCESS IS OFF PAVEMENT.
4.REFER TO THE FINAL DRAINAGE REPORT, DATED APRIL 24, 2024 BY NORTHERN
ENGINEERING FOR ADDITIONAL INFORMATION.
5.REFER TO INLET SCHEDULE ON SHEET D5 FOR CLARIFICATION OF INLET AND
BASIN TYPES.
GENERAL NOTES:
WATTLE DIKE
CONCRETE WASH AREA
SEDIMENT TRAP
BALE INLET PROTECTION
SLOPE DRAIN
LEGEND:
BALE OUTLET PROTECTION
INLET PROTECTION
VEHICLE TRACKING CONTROL PAD
SF
LIMIT OF DISTURBANCE LOD
TURF REINFORCEMENT (TMAX)
UPLAND SEED MIX
DETENTION BASIN SEED MIX
EXISTING/PROPOSED NATURAL
HABITAT BUFFER ZONE
SEED MIX LEGEND:
1.SEE LANDSCAPE PLANS FOR SEED MIXES, INSTALLATION, INSPECTION, AND
WARRANTY INFORMATION.
2.THE LOCATION OF PLANTINGS WILL NEED TO WITH VERIFIED WITH
ENVIRONMENTAL PLANNING AND STORMWATER DEPARTMENTS AT THE TIME OF
PLANTING TO VERIFY CURRENT GRADING.
3.SEE IRRIGATION PLAN FOR DETAILED IRRIGATION LAYOUT. PROVIDE TEMPORARY
IRRIGATION FOR THE ESTABLISHMENT PERIOD OF SEED MIXES.
SEED AND MULCH
IRRIGATED TURF
ROCK MULCH
TABLE OF CONSTRUCTION SEQUENCE AND BMP APPLICATION
Project: MASON STREET INFRASTRUCTURE
CONSTRUCTION PHASE MOBILIZATION DEMOLITION GRADING
BEST MANAGEMENT PRACTICES (BMPS)
STRUCTURAL "INSTALLATION"
Silt Fence Barriers *
Flow Barriers (Wattles) *
Inlet Filter Bags *
Vegetative
Temporary Seeding Planting
Mulching / Sealant
Permanent Seeding Planting
Sod Installation
Rolled Products : Netting / Blankets / Mats
Contour Furrows (Ripping / Disking)
Rock Bags *
UTILITIES
INSTALLATION
FLAT WORK
INSTALLATION LANDSCAPE DEMOBILIZATION
Vehicle Tracking Pad *
* All Temporary BMPs to be Removed once Construction is Complete
Any prior inlets that could use protecting
Any prior inlets that could use protecting
Anytime the site will sit dormant longer than 30 Days
Anytime the site will sit dormant longer than 30 Days
Anytime the site will sit dormant longer than 30 Days
Riprap
KEYMAP
HIBDON CT.
M
A
S
O
N
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T
.
HICKORY ST.
CALCULATIONS CHART
TOTAL DISTURBED PROJECT AREA 11.35 ACRES
TOTAL "ONSITE" AREA OF DISTURBANCE 11.09 ACRES
TOTAL "OFFSITE" AREA OF DISTURBANCE 0.26 ACRES
TOTAL STORAGE/STAGING AREA 0.2 (EST.)ACRES
TOTAL HAUL ROADS AREA N/A
CONSTRUCTION VEHICLE TRAFFIC AREA N/A
EST. PERCENT OF PROJECT AREA EXPOSED 0%
EST. PERCENT VEGETATIVE COVER ~90%DENSITY
EXISTING SOIL TYPE C
APPROX. GROUNDWATER DEPTH 8 FEET
NUMBER OF PHASES W/ PROJECT N/A
TOTAL VOLUME OF IMPORTED (+) / EXPORTED (-) MATERIALS (-)3418 CUB. YD.
TOTAL AREA OF STOCKPILING OF FILL OR BORROW AREAS OFF SITE N/A SQ. FEET
STEEPEST SLOPE 4:1 H:V
DISTANCE FROM A RIPARIAN AREA OR SENSITIVE AREA N/A FEET
CONTRACTOR TO PROVIDE PERIMETER CONTROLS
FOR STOCKPILE AND WIND EROSION PROTECTION
UNTIL SEEDING AND MULCHING OF AREA
EROSION CONTROL NOTE
ALL MUD AND DEBRIS MUST BE KEPT OUT OF ADJACENT
ROADWAYS OR CLEANED UP IMMEDIATELY.
CALL 2 BUSINESS DAYS IN ADVANCE BEFORE YOU
DIG, GRADE, OR EXCAVATE FOR THE MARKING OF
UNDERGROUND MEMBER UTILITIES.
CALL UTILITY NOTIFICATION CENTER OF
COLORADO
Know what'sbelow.
before you dig.Call
R
XXX X
X
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OHU OHU OHU OHU OHU
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71' ROW
NCFS LLC
300 HICKORY STREET
FORT COLLINS, CO
QR INC.
280 HICKORY STREET
FORT COLLINS, CO
QR INC.
200 HICKORY STREET
FORT COLLINS, CO
R AND S HOLDINGS
1235 N. COLLEGE AVENUE
FORT COLLINS, CO
HAINES BRANDON KUHRT 1295
N. COLLEGE AVENUE FORT
COLLINS, CO
GRATITUDE LLC
1303 N. COLLEGE AVENUE
FORT COLLINS, CO
HOYT JOHN R
1307 N. COLLEGE AVENUE
FORT COLLINS, CO
1311 N. COLLEGE LLC
HIBON CT.
FORT COLLINS, CO
1311 N. COLLEGE LLC
1311 N. COLLEGE AVENUE
FORT COLLINS, CO
WANKIER LANCE
1401 N. COLLEGE AVENUE
FORT COLLINS, CO
WOOD RONALD G/ JENNIFER
L/ WILLARD E
122 HIBDON COURT
FORT COLLINS, CO
THOMPSON PROPERTIES LLC
1319 N. COLLEGE AVENUE
FORT COLLINS, CO
D AND S MOTELS INC
1405 N. COLLEGE AVENUE
FORT COLLINS, CO
N
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HIBDON COURT
UNION PACIFIC RAILROAD
EXISTING STORM
DRAIN
EXISTING STORM
INLET
LOT LINE
HICKORY REGIONAL
DETENTION POND
CURB CUT AND
SIDEWALK CHASE
LOT 1
LOT 2
SWALE
LOT 371' ROW
42'' FL-FL
42'' FL-FL
EC
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----
NORTH
( IN FEET )
1 inch = ft.
Feet05050
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CALL 2 BUSINESS DAYS IN ADVANCE BEFORE YOU
DIG, GRADE, OR EXCAVATE FOR THE MARKING OF
UNDERGROUND MEMBER UTILITIES.
CALL UTILITY NOTIFICATION CENTER OF
COLORADO
Know what'sbelow.
before you dig.Call
R
PROPOSED CONTOUR
PROPOSED STORM SEWER
PROPOSED SWALE
EXISTING CONTOUR
PROPOSED CURB & GUTTER
PROPERTY BOUNDARY
SILT FENCE
ROCK SOCK
SCOUR STOP
1.CONTRACTOR SHALL IMMEDIATELY STABILIZE ALL DISTURBED SLOPES BY CRIMP
MULCHING OR SIMILAR METHODS.
2.SWMP ADMINISTRATOR:
Contact ________________________________
Company ________________________________
Address ________________________________
Phone________________________________
3.CONTRACTOR TO PROVIDE VEHICLE TRACKING CONTROL FOR CONCRETE
WASHOUT AREA IF ACCESS IS OFF PAVEMENT.
4.REFER TO THE FINAL DRAINAGE REPORT, DATED MARCH 13, 2024 BY NORTHERN
ENGINEERING FOR ADDITIONAL INFORMATION.
5.REFER TO INLET SCHEDULE ON SHEET D5 FOR CLARIFICATION OF INLET AND
BASIN TYPES.
GENERAL NOTES:
WATTLE DIKE
CONCRETE WASH AREA
SEDIMENT TRAP
BALE INLET PROTECTION
SLOPE DRAIN
LEGEND:
BALE OUTLET PROTECTION
INLET PROTECTION
VEHICLE TRACKING CONTROL PAD
SF
LIMIT OF DISTURBANCE LOD
TURF REINFORCEMENT (TMAX)
UPLAND SEED MIX
DETENTION BASIN SEED MIX
EXISTING/PROPOSED NATURAL
HABITAT BUFFER ZONE
SEED MIX LEGEND:
1.SEE LANDSCAPE PLANS FOR SEED MIXES, INSTALLATION, INSPECTION, AND
WARRANTY INFORMATION.
2.THE LOCATION OF PLANTINGS WILL NEED TO WITH VERIFIED WITH
ENVIRONMENTAL PLANNING AND STORMWATER DEPARTMENTS AT THE TIME OF
PLANTING TO VERIFY CURRENT GRADING.
3.SEE IRRIGATION PLAN FOR DETAILED IRRIGATION LAYOUT. PROVIDE TEMPORARY
IRRIGATION FOR THE ESTABLISHMENT PERIOD OF SEED MIXES.
SEED AND MULCH
IRRIGATED TURF
ROCK MULCH
TABLE OF CONSTRUCTION SEQUENCE AND BMP APPLICATION
Project: MASON STREET INFRASTRUCTURE
CONSTRUCTION PHASE MOBILIZATION DEMOLITION GRADING
BEST MANAGEMENT PRACTICES (BMPS)
STRUCTURAL "INSTALLATION"
Silt Fence Barriers *
Flow Barriers (Wattles) *
Inlet Filter Bags *
Vegetative
Temporary Seeding Planting
Mulching / Sealant
Permanent Seeding Planting
Sod Installation
Rolled Products : Netting / Blankets / Mats
Contour Furrows (Ripping / Disking)
Rock Bags *
UTILITIES
INSTALLATION
FLAT WORK
INSTALLATION LANDSCAPE DEMOBILIZATION
Vehicle Tracking Pad *
* All Temporary BMPs to be Removed once Construction is Complete
Any prior inlets that could use protecting
Any prior inlets that could use protecting
Anytime the site will sit dormant longer than 30 Days
Anytime the site will sit dormant longer than 30 Days
Anytime the site will sit dormant longer than 30 Days
Riprap
CALCULATIONS CHART
TOTAL DISTURBED PROJECT AREA 11.35 ACRES
TOTAL "ONSITE" AREA OF DISTURBANCE 11.09 ACRES
TOTAL "OFFSITE" AREA OF DISTURBANCE 0.26 ACRES
TOTAL STORAGE/STAGING AREA 0.2 (EST.)ACRES
TOTAL HAUL ROADS AREA N/A
CONSTRUCTION VEHICLE TRAFFIC AREA N/A
EST. PERCENT OF PROJECT AREA EXPOSED 0%
EST. PERCENT VEGETATIVE COVER ~90%DENSITY
EXISTING SOIL TYPE C
APPROX. GROUNDWATER DEPTH 8 FEET
NUMBER OF PHASES W/ PROJECT N/A
TOTAL VOLUME OF IMPORTED (+) / EXPORTED (-) MATERIALS (-)3418 CUB. YD.
TOTAL AREA OF STOCKPILING OF FILL OR BORROW AREAS OFF SITE N/A SQ. FEET
STEEPEST SLOPE 4:1 H:V
DISTANCE FROM A RIPARIAN AREA OR SENSITIVE AREA N/A FEET
`
NORTHERNENGINEERING.COM | 970.221.4158 SWMP: MASON STREET INFRASTRUCTURE
FORT COLLINS | GREELEY APPENDIX
APPENDIX B
EROSION CONTROL DETAILS
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VTC
ROCK SOCK SECTION ROCK SOCK PLAN
ROCK SOCK JOINTING
GRADATION TABLE
SIEVE SIZE
MASS PERCENT
PASSING SQUARE
MESH SIEVES
NO. 4
2"100
1-1/2"90-100
1"20-55
3/4"0-15
3/8"0-5
MATCHES SPECIFICATIONS FOR NO. 4 COARSE AGGREGATE FOR
CONCRETE PER AASHTO M43. ALL ROCK SHALL BE FRACTURED FACE,
ALL SIDES
RS
001 CONCRETE WASHOUT AREA 002 ROCK SOCK 003 VEHICLE TRACKING PAD
004 SILT FENCE
SF
CWA
005 CURB INLET PROTECTION
IP
POSTS
PREASSEMBLED SILT FENCE POSTS SHALL OVERLAP
AT JOINTS SO THAT NO
GAPS EXIST IN SILT FENCE.
NOTE:
THICKNESS OF GEOTEXTILE
HAS BEEN EXAGGERATED.POST SHALL BE JOINED AS SHOWN, THEN
ROTATED 180° IN DIRECTION SHOWN AND
DRIVEN INTO THE GROUND.
SILT FENCE JOINTS
DRIVE POSTS VERTICALLY INTO THE GROUND TO A MINIMUM DEPTH OF 18".
EXCAVATE A TRENCH APPROXIMATELY 4" WIDE AND 4" DEEP ALONG THE
LINE OF POSTS AND UPSLOPE FROM THE BARRIER.
ANCHOR TRENCH SHALL BE EXCAVATED BY HAND, WITH TRENCHER, OR
WITH SILT FENCE INSTALLATION MACHINE. NO ROAD GRADERS, BACKHOES,
ETC. SHALL BE USED.
NOT LESS THAN THE BOTTOM 1' OF THE SILT FENCE FABRIC SHALL BE
BURIED IN THE TRENCH.
THE TRENCH SHALL BE COMPACTED BY HAND, WITH "JUMPING JACK" OR BY
WHEEL ROLLING. COMPACTION SHALL BE SUCH THAT THE SILT FENCE
RESISTS BEING PULLED OUT OF ANCHOR TRENCH BY HAND.
SILT FENCE INDICATED IN THE PLANS SHALL BE INSTALLED PRIOR TO ANY
LAND-DISTURBING ACTIVITIES.
USE WOOD POSTS OR OTHER MATERIAL AS ACCEPTED BY THE CITY.
INSTALLATION NOTES:
1.
2.
3.
4.
5.
6.
7.
THE CONTRACTOR SHALL INSPECT SILT FENCE EVERY TWO WEEKS AND
AFTER SIGNIFICANT STORM EVENTS AND MAKE REPAIRS OR CLEAN OUT
UPSTREAM SEDIMENT AS NECESSARY.
SEDIMENT ACCUMULATED UPSTREAM OF SILT FENCE SHALL BE REMOVED
WHEN THE UPSTREAM SEDIMENT REACHES A DEPTH OF 6".
SILT FENCE SHALL BE REMOVED WHEN THE UPSTREAM DISTURBED AREA IS
STABILIZED AND GRASS COVER IS ACCEPTED BY THE CITY. IF ANY
DISTURBED AREA EXISTS AFTER REMOVAL, IT SHALL BE SEEDED AND
MULCHED OR OTHERWISE STABILIZED IN A MANNER ACCEPTED BY THE CITY.
MAINTENANCE NOTES:
1.
2.
3.
4" MIN.
4" MIN.
1 12" x 1 12" WOODEN FENCE POSTS
SF
006
SECTION G-G
G
PLAN
G
BOP
BALE OUTLET PROTECTION 36" ANCHOR STRAP
BULLET ANCHOR
RECESSED LOCK
WASHER
TRANSITION MAT
TURF
REINFORCEMENT
MAT
ANCHOR PATTERN
ANCHOR ILLUSTRATION
MAX. 1"-2" DROP
FROM CULVERT FLOWLINE
ONTO SCOURSTOP MATS
PROFILE VIEW
SECTION VIEW AA
OUTLET AND CHANNEL SCOUR PROTECTION
(TRANSITION MATS)
DIRECTION OF FLOW
TURF REINFORCEMENT MAT
WIDTH OF
PROTECTION
LENGTH OF PROTECTION
D
D= CULVERT DIAMETER
TRAN
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CULVERT OUTLET PROTECTION - PLAN VIEW
INSTALL ANCHORS PER SCOURSTOP INSTALLATION GUIDELINES
MINIMUM DEPTH 24" IN COMPACTED, COHESIVE SOIL.
MINIMUM DEPTH 30" IN LOOSE, SANDY, OR WET SOIL
EXTRA ANCHORS AS NEEDED TO SECURE MAT TIGHTLY OVER SOIL
COVER
ABUT TRANSITIONS MATS TO END OF CULVERT OR CULVERT APRON.
ADJACENT MATS ABUT TOGETHER LATERALLY AND LONGITUDINALLY.
MINIMUM 8 ANCHORS PER MAT.
EXTRA ANCHORS AS NEEDED FOR LOOSE OR WET SOILS.
PROTECT BARE/ DISTURBED DOWNSTREAM
SOILS FROM EROSION WITH APPROPRIATE
SOIL COVER.
NOTE:
1.SCOUR STOP MAT PRODUCT UTILIZED FOR TURF REINFORCEMENT MAT DIMENSIONS.
2.SEEDING AT OUTFALL OF STORM SEWER SHALL BE COMPLETED PRIOR TO INSTALLATION OF TURF REINFORCEMENT MAT.
SS
SEEDING TO OCCUR
PRIOR TO INSTALLATION
007 SCOUR STOP DETAIL AND SCHEDULE
Scourstop Summary
FES ID W (FT)L (FT)Quantity of Mats Velocity (ft/s)
FES C1 (18" HDPE)8 8 4 9.70
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3'-4'
ADJACENT ROLLS SHALL
TIGHTLY ABUT
W1 NOTES:
INSTALLATION:
WHEN INSTALLING RUNNING LENGTHS OF WATTLES, BUTT THE SECOND
WATTLE TIGHTLY AGAINST THE FIRST, DO NOT OVERLAP THE ENDS. STAKE
THE WATTLES AT EACH END AND FOUR FOOT ON CENTER. FOR EXAMPLE:
A 25 FOOT WATTLE USES 6 STAKES
A 20 FOOT WATTLE USES 5 STAKES
A 12 FOOT WATTLE USES 4 STAKES
STAKES SHOULD BE DRIVEN THROUGH THE MIDDLE OF THE WATTLE.
LEAVING 2 - 3 INCHES OF THE STAKE PROTRUDING ABOVE THE WATTLE. A
HEAVY SEDIMENT LOAD WILL TEND TO PICK THE WATTLE UP AND COULD
PULL IT OFF THE STAKES IF THEY ARE DRIVEN DOWN TOO LOW. IT MAY BE
NECESSARY TO MAKE A HOLE IN THE WATTLE WITH A PICK END OF YOUR
MADDOX IN ORDER TO GET THE STAKE THROUGH THE STRAW. WHEN
STRAW WATTLES ARE USED FOR FLAT GROUND APPLICATIONS, DRIVE THE
STAKES STRAIGHT DOWN; WHEN INSTALLING WATTLES ON SLOPES, DRIVE
THE STAKES PERPENDICULAR TO THE SLOPE.
DRIVE THE FIRST END STAKE OF THE SECOND WATTLE AT AN ANGLE
TOWARD THE FIRST WATTLE IN ORDER TO HELP ABUT THEM TIGHTLY
TOGETHER. IF YOU HAVE DIFFICULTY DRIVING THE STAKE INTO EXTREMELY
HARD OR ROCKY SLOPES, A PILOT BAR MAY BE NEEDED TO BEGIN THE
STAKE HOLE.
1"x 1" WOOD STAKES
18"-24"
BAILING WIRE OR
NYLON ROPE
WATTLE "A"WATTLE "B"
1'2'
TYP.
1'1'
W2 NOTES:
INSTALLATION:
STAKES SHOULD BE DRIVEN ACROSS FROM EACH OTHER
AND ON EACH SIDE OF THE WATTLE. LEAVING 4"-6" OF
STAKE PROTRUDING ABOVE THE WATTLE. BAILING WIRE OR
NYLON ROPE SHOULD BE TIED TO THE STAKES ACROSS
THE WATTLE. STAKES SHOULD THEN BE DRIVEN UNTIL THE
BAILING WIRE OR NYLON ROPE IS SUFFICIENTLY SNUG TO
THE WATTLE.
WHEN INSTALLING RUNNING LENGTHS OF WATTLES, TO
PREVENT SHIFTING, BUTT THE SECOND WATTLE TIGHTLY
AGAINST THE FIRST. DO NOT OVERLAP THE ENDS. STAKES
SHOULD BE DRIVEN 1 FT. FROM END, ACROSS FROM AND
ON EACH SIDE OF WATTLE LEAVING 4"-6" OF STAKE
PROTRUDING ABOVE THE WATTLE. BAILING WIRE OR
NYLON ROPE SHOULD BE TIED TO STAKES IN AN HOUR
GLASS FORMATION (FRONT TO BACK OF WATTLE "A",
ACROSS TO FRONT OF WATTLE "B", ACROSS TO BACK AND
BACK TO FRONT OF WATTLE "A"). STAKES SHOULD THEN BE
DRIVEN IN UNTIL BAILING WIRE OR NYLON ROPE IS
SUFFICIENTLY SNUG TO THE WATTLE.
SEDIMENT
DEPOSITION
ZONE
STORM WATER LINE
WEIGHTED WATTLE
LIP OF GUTTER
SIDEWALK EXISTING OR
PROPOSED INLET
TOP BACK CURB
FLOW LINE
SEDIMENT
DEPOSITION
ZONE
STORM WATER LINE
LIP OF GUTTER
WEIGHTED WATTLE
AT 45 DEG. TO CURB
SIDEWALK
TOP BACK CURB
FLOW LINE
SIDEWALK
TOP BACK CURB
FLOW LINE
W4 NOTES:
1. NUMBER OF WATTLES AND SPACING SHOULD BE DETERMINED BY THE SLOPE AND SITE CONDITIONS.
2. TUBULAR MARKERS SHALL MEET THE REQUIREMENTS OF MANUAL ON UNIFORM TRAFFIC CONTROL DEVICES (MUTCD)
3. CITY RECOMMENDS INSTALLING AT LEAST 3 CHECKDAMS WHEN USING THIS SETUP.
LIP OF GUTTER
WEIGHTED WATTLE
W1 & W2 INSTALLATION NOTES:
1. THE LOCATION AND LENGTH OF WATTLE IS DEPENDENT ON THE CONDITIONS OF EACH SITE.
2. WATTLES SHALL BE INSTALLED PRIOR TO ANY LAND-DISTURBING ACTIVITIES.
3. WATTLES SHALL CONSIST OF STRAW, COMPOST, EXCELSIOR, OR COCONUT FIBER.
4. NOT FOR USE IN CONCENTRATED FLOW AREAS.
5. THE WATTLES SHALL BE TRENCHED INTO THE GROUND A MINIMUM OF TWO (2) INCHES.
6. WATTLES SHALL BE INSTALLED PER MANUFACTURERS SPECIFICATIONS.
7. ON SLOPES, WATTLES SHOULD BE INSTALLED ON CONTOUR WITH A SLIGHT DOWNWARD ANGLE AT THE END OF THE ROW IN ORDER TO PREVENT
PONDING AT THE MID SECTION.
8. RUNNING LENGTHS OF WATTLES SHOULD BE ABUTTED FIRMLY TO ENSURE NO LEAKAGE AT THE ABUTMENTS.
9. SPACING - DOWNSLOPE:
VERTICAL SPACING FOR SLOPE INSTALLATIONS SHOULD BE DETERMINED BY SITE CONDITIONS. SLOPE GRADIENT AND SOIL TYPE ARE THE MAIN
FACTORS. A GOOD RULE OF THUMB IS:
1:1 SLOPES = 10 FEET APART
2:1 SLOPES = 20 FEET APART
3:1 SLOPES = 30 FEET APART
4:1 SLOPES = 40 FEET APART, ETC.
HOWEVER, ADJUSTMENTS MAY HAVE TO BE MADE FOR THE SOIL TYPE: FOR SOFT, LOAMY SOILS - ADJUST THE ROWS CLOSER TOGETHER;
FOR HARD, ROCKY SOILS - ADJUST THE ROWS FURTHER APART. A SECONDARY WATTLE PLACED BEHIND THE ABUTMENT OF TWO WATTLES IS
ENCOURAGED ON STEEP SLOPES OR WHERE JOINTS HAVE FAILED IN THE PAST.
10. STAKING: THE CITY RECOMMENDS USING WOOD STAKES TO SECURE THE WATTLES. 1/2" TO 5/8" REBAR IS ALSO ACCEPTABLE. BE SURE TO USE A
STAKE THAT IS LONG ENOUGH TO PROTRUDE SEVERAL INCHES ABOVE THE WATTLE: 18" IS A GOOD LENGTH FOR HARD, ROCKY SOIL. FOR SOFT
LOAMY SOIL USE A 24" STAKE.
4"-6" ABOVE WATTLE AFTER BAILING WIRE
OR NYLON ROPE IS ATTACHED. STAKES
NEED TO BE TAMPED UNTIL WIRE/ROPE IS
SNUG WITH WATTLE.
W3 NOTE:
IF THE AREA BEHIND THE INLET IS NOT STABILIZED, A
BMP SHOULD BE USED TO PREVENT SEDIMENT FROM
ENTERING THE INLET
1"x 1" WOOD STAKES
18"-24"
THE CONTRACTOR SHALL INSPECT WATTLES EVERY TWO WEEKS AND AFTER ANY SIGNIFICANT STORM EVENT AND MAKE REPAIRS OR REMOVE SEDIMENT
ACCUMULATED BEHIND WATTLE AS NECESSARY.
SEDIMENT ACCUMULATED BEHIND WATTLE SHALL BE REMOVED WHEN THE SEDIMENT HAS ACCUMULATED TO ONE HALF THE DIAMETER OF THE WATTLE.
WATTLES SHALL REMAIN IN PLACE UNTIL THE UPSTREAM DISTURBED AREA IS STABILIZED AND IS ACCEPTED BY THE CITY.
WATTLE MAINTENANCE NOTES:
1.
2.
3.
ENDS SHALL ABUT TIGHTLY
TO BACK OF CURB
END SHALL ABUT TIGHTLY
TO BACK OF CURB
ENDS OF ADJACENT WATTLES
SHALL BE TIGHTLY ABUTTED
TO PREVENT SEDIMENT BYPASS
4' MAX.
SEDIMENT
DEPOSITION ZONE
W2 NOTE:
ONLY WATTLES MADE WITH COCONUT
FIBERS SHALL BE USED WHEN
INSTALLATION COMES IN CONTACT WITH A
WATER BODY.
SIDEWALK CULVERT/CHASE/PAN
W3, W4 & W5 NOTES:
1. WHEN USING STRAW WATTLE, THE STRAW WATTLE MUST HAVE A WEIGHTED
CORE.
2. ALL PRODUCTS SHALL BE INSTALLED PER THE MANUFACTURER'S
SPECIFICATIONS.
3. OTHER PRODUCTS MAY BE USED IN PLACE OF WEIGHTED WATTLES UPON
WRITTEN APPROVAL FROM THE CITY. NOTE: A COPY OF DETAILS AND
SPECIFICATIONS WILL NEED TO BE INCORPORATED INTO THE SWMP.
END SHALL
TIGHTLY ABUT TO
BACK OF CURB
SEDIMENT
DEPOSITION ZONE
TUBULAR
MARKER
EXISTING OR
PROPOSED INLET
END SHALL
TIGHTLY ABUT TO
BACK OF CURB
WATTLE INSTALLATION DETAIL008
SLOPE
INSTALLATION
DETAIL
Drawing Not To Scale
1.Prepare soil before installing rolled
erosion control products (RECPs),
including any necessary
application of lime, fertilizer, and
seed.
2.Begin at the top of the slope by
anchoring the RECPs in a
6"(15cm) deep X 6"(15cm) wide
trench with approximately 12"
(30cm) of RECPs extended beyond
the up-slope portion of the trench.
Anchor the RECPs with a row of
staples/stakes approximately 12"
(30cm) apart in the bottom of the
trench. Backfill and compact the
trench after stapling. Apply seed to
the compacted soil and fold the
remaining 12"(30cm) portion of
RECPs back over the seed and
compacted soil. Secure RECPs
over compacted soil with a row
of staples/stakes spaced
approximately 12"(30cm) apart
across the width of the RECPs.
3.Roll the RECPs (A) down or (B)
horizontally across the slope.
RECPs will unroll with appropriate
side against the soil surface. All
RECPs must be securely fastened
to soil surface by placing
staples/stakes in appropriate
locations as shown in the staple
pattern guide.
4.The edges of parallel RECPs must
be stapled with approximately 2" -
5" (5-12.5cm) overlap depending
on the RECPs type.
5.Consecutive RECPs spliced down
the slope must be end over end
(Shingle style) with an approximate
3"(7.5cm) overlap. Staple through
overlapped area, approximately
12"(30cm) apart across entire
RECPs width.
Drawn on: 3-16-11
Disclaimer:
The information presented herein is general design information only. For specific applications,
consult an independent professional for further design guidance.
2"-5"
(5-12.5cm)
3B
4
2
5
1
3A
12"(30cm)
6"
(15cm)
6"
(15cm)
*NOTE:
In loose soil conditions, the use of
staple or stake lengths greater than
6"(15cm) may be necessary to
properly secure the RECP's.
3"(7.5cm)
5401 St. Wendel - Cynthiana Rd.
Poseyville, IN 47633
PH: 800-722-2040
www.nagreen.com
TMAX EROSION CONTROL BLANKET INSTALLATION DETAIL009
010 TMAX EROSION CONTROL BLANKET STAPLE PATTERN
10"
(25cm)
10"(25cm)
20"(0.5m)
3.75 Staples per SQ.YD.
E 2"-5"
(5-12.5cm)
2"-5"
(5-12.5cm)
3.3'
(1m)
4'
(1.2m)
2'
(0.6m)
Chapter 7 Construction BMPs
November 2010 Urban Drainage and Flood Control District 7-13
Urban Storm Drainage Criteria Manual Volume 3
Final Stabilization
▪Revegetate Site
▪Activate Post Construction BMPs
(e.g., convert sediment basin to extended
detention basin)
▪Remove Temporary BMPs
▪Closeout State and Local Stormwater Permits
Construction Phase
Representative Phases:
▪Clearing and Grubbing
▪Rough Grading
▪Road Construction
▪Utility and Infrastructure Installation
▪Vertical Construction (Buildings)
▪Final Grading
Management Practices:
▪Phase Construction Activities to Minimize
Disturbed Area at a Given Time
▪Sequence Contruction within Phases to Avoid
Idle Disturbed Areas
▪Install, Inspect and Proactively Maintain BMPs
Appropriate for Each Phase of Construction
▪Maintain and Update SWMP as Construction
Progresses
Pre-Construction
▪Develop Site Plan
▪Obtain Site Survey, Hydrology and Soils
Information
▪Prepare SWMP
▪Obtain Stormwater Construction Permits
(State and Local)
▪Obtain Other Relevant Permits
(e.g., 404 , Floodplain, Dewatering)
Figure 7-2. Construction Stormwater Management
Construction BMPs Construction BMPs
7-14 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Functions Erosion
Control
Sediment
Control
Site/Material
Management
Surface Roughening Yes No No
Temporary/Permanent Seeding Yes No No
Soil Binders Yes No Moderate
Mulching Yes Moderate No
Compost Blankets and Filter Berms Yes Moderate No
Rolled Erosion Control Products Yes No No
Temporary Slope Drains Yes No No
Temporary Outlet Protection Yes Moderate No
Rough Cut Street Control Yes Moderate No
Earth Dikes / Drainage Swales Yes Moderate No
Terracing Yes Moderate No
Check Dams Yes Moderate No
Streambank Stabilization Yes No No
Wind Erosion / Dust Control Yes No Moderate
Silt Fence No Yes No
Sediment Control Log Moderate Yes No
Straw Bale Barrier No Moderate No
Brush Barrier Moderate Moderate No
Rock Sock (perimeter control)No Yes No
Inlet Protection (various forms)No Yes No
Sediment Basins No Yes No
Sediment Traps No Yes No
Vegetative Buffers Moderate Yes Yes
Chemical Treatment Moderate Yes No
Concrete Washout Area No No Yes
Stockpile Management Yes Yes Yes
Good Houskeeping (multiple practices)No No Yes
Construction Phasing Moderate Moderate Yes
Protection of Existing Vegetation Yes Moderate Yes
Construction Fence No No Yes
Vehicle Tracking Control Moderate Yes Yes
Stabilized Construction Roadway Yes Moderate Yes
Stabilized Staging Area Yes Moderate Yes
Street Sweeping / Vacuuming No Yes Yes
Temporary Diversion Channel Yes No No
Dewatering Operations Moderate Yes Yes
Temporary Stream Crossing Yes Yes No
Temporary Batch Plants No No Yes
Paving and Grinding Operations No No Yes
Site Management and Other Specific Practices
Sediment Control BMPs
Erosion Control BMPs
Materials Management
Table 7-2. Overview of Construction BMPs
Surface Roughening (SR) EC-1
November 2010 Urban Drainage and Flood Control District SR-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph SR-1. Surface roughening via imprinting for temporary
stabilization.
Description
Surface roughening is an erosion control
practice that involves tracking,
scarifying, imprinting, or tilling a
disturbed area to provide temporary
stabilization of disturbed areas. Surface
roughening creates variations in the soil
surface that help to minimize wind and
water erosion. Depending on the
technique used, surface roughening may
also help establish conditions favorable
to establishment of vegetation.
Appropriate Uses
Surface roughening can be used to
provide temporary stabilization of
disturbed areas, such as when
revegetation cannot be immediately established due to seasonal planting limitations. Surface roughening
is not a stand-alone BMP, and should be used in conjunction with other erosion and sediment controls.
Surface roughening is often implemented in conjunction with grading and is typically performed using
heavy construction equipment to track the surface. Be aware that tracking with heavy equipment will also
compact soils, which is not desirable in areas that will be revegetated. Scarifying, tilling, or ripping are
better surface roughening techniques in locations where revegetation is planned. Roughening is not
effective in very sandy soils and cannot be effectively performed in rocky soil.
Design and Installation
Typical design details for surfacing roughening on steep and mild slopes are provided in Details SR-1 and
SR-2, respectively.
Surface roughening should be performed either after final grading or to temporarily stabilize an area
during active construction that may be inactive for a short time period. Surface roughening should create
depressions 2 to 6 inches deep and approximately 6 inches apart. The surface of exposed soil can be
roughened by a number of techniques and equipment. Horizontal grooves (running parallel to the
contours of the land) can be made using tracks from equipment treads, stair-step grading, ripping, or
tilling.
Fill slopes can be constructed with a roughened surface. Cut slopes that have been smooth graded can be
roughened as a subsequent operation. Roughening should follow along the contours of the slope. The
tracks left by truck mounted equipment working perpendicular
to the contour can leave acceptable horizontal depressions;
however, the equipment will also compact the soil.
Surface Roughening
Functions
Erosion Control Yes
Sediment Control No
Site/Material Management No
EC-1 Surface Roughening (SR)
SR-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Maintenance and Removal
Care should be taken not to drive vehicles or equipment over areas that have been surface roughened.
Tire tracks will smooth the roughened surface and may cause runoff to collect into rills and gullies.
Because surface roughening is only a temporary control, additional treatments may be necessary to
maintain the soil surface in a roughened condition.
Areas should be inspected for signs of erosion. Surface roughening is a temporary measure, and will not
provide long-term erosion control.
Surface Roughening (SR) EC-1
November 2010 Urban Drainage and Flood Control District SR-3
Urban Storm Drainage Criteria Manual Volume 3
EC-1 Surface Roughening (SR)
SR-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Temporary and Permanent Seeding (TS/PS) EC-2
November 2010 Urban Drainage and Flood Control District TS/PS-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph TS/PS -1. Equipment used to drill seed. Photo courtesy of
Douglas County.
Description
Temporary seeding can be used to
stabilize disturbed areas that will be
inactive for an extended period.
Permanent seeding should be used to
stabilize areas at final grade that will not
be otherwise stabilized. Effective seeding
includes preparation of a seedbed,
selection of an appropriate seed mixture,
proper planting techniques, and protection
of the seeded area with mulch, geotextiles,
or other appropriate measures.
Appropriate Uses
When the soil surface is disturbed and
will remain inactive for an extended
period (typically 30 days or longer),
proactive stabilization measures should be implemented. If the inactive period is short-lived (on the order
of two weeks), techniques such as surface roughening may be appropriate. For longer periods of
inactivity, temporary seeding and mulching can provide effective erosion control. Permanent seeding
should be used on finished areas that have not been otherwise stabilized.
Typically, local governments have their own seed mixes and timelines for seeding. Check jurisdictional
requirements for seeding and temporary stabilization.
Design and Installation
Effective seeding requires proper seedbed preparation, selection of an appropriate seed mixture, use of
appropriate seeding equipment to ensure proper coverage and density, and protection with mulch or fabric
until plants are established.
The USDCM Volume 2 Revegetation Chapter contains detailed seed mix, soil preparations, and seeding
and mulching recommendations that may be referenced to supplement this Fact Sheet.
Drill seeding is the preferred seeding method. Hydroseeding is not recommended except in areas where
steep slopes prevent use of drill seeding equipment, and even in these instances it is preferable to hand
seed and mulch. Some jurisdictions do not allow hydroseeding or hydromulching.
Seedbed Preparation
Prior to seeding, ensure that areas to be revegetated have
soil conditions capable of supporting vegetation. Overlot
grading can result in loss of topsoil, resulting in poor quality
subsoils at the ground surface that have low nutrient value,
little organic matter content, few soil microorganisms,
rooting restrictions, and conditions less conducive to
infiltration of precipitation. As a result, it is typically
necessary to provide stockpiled topsoil, compost, or other
Temporary and Permanent Seeding
Functions
Erosion Control Yes
Sediment Control No
Site/Material Management No
EC-2 Temporary and Permanent Seeding (TS/PS)
TS/PS-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
soil amendments and rototill them into the soil to a depth of 6 inches or more.
Topsoil should be salvaged during grading operations for use and spread on areas to be revegetated later.
Topsoil should be viewed as an important resource to be utilized for vegetation establishment, due to its
water-holding capacity, structure, texture, organic matter content, biological activity, and nutrient content.
The rooting depth of most native grasses in the semi-arid Denver metropolitan area is 6 to 18 inches. At a
minimum, the upper 6 inches of topsoil should be stripped, stockpiled, and ultimately respread across
areas that will be revegetated.
Where topsoil is not available, subsoils should be amended to provide an appropriate plant-growth
medium. Organic matter, such as well digested compost, can be added to improve soil characteristics
conducive to plant growth. Other treatments can be used to adjust soil pH conditions when needed. Soil
testing, which is typically inexpensive, should be completed to determine and optimize the types and
amounts of amendments that are required.
If the disturbed ground surface is compacted, rip or rototill the surface prior to placing topsoil. If adding
compost to the existing soil surface, rototilling is necessary. Surface roughening will assist in placement
of a stable topsoil layer on steeper slopes, and allow infiltration and root penetration to greater depth.
Prior to seeding, the soil surface should be rough and the seedbed should be firm, but neither too loose
nor compacted. The upper layer of soil should be in a condition suitable for seeding at the proper depth
and conducive to plant growth. Seed-to-soil contact is the key to good germination.
Seed Mix for Temporary Vegetation
To provide temporary vegetative cover on disturbed areas which will not be paved, built upon, or fully
landscaped or worked for an extended period (typically 30 days or more), plant an annual grass
appropriate for the time of planting and mulch the planted areas. Annual grasses suitable for the Denver
metropolitan area are listed in Table TS/PS-1. These are to be considered only as general
recommendations when specific design guidance for a particular site is not available. Local governments
typically specify seed mixes appropriate for their jurisdiction.
Seed Mix for Permanent Revegetation
To provide vegetative cover on disturbed areas that have reached final grade, a perennial grass mix should
be established. Permanent seeding should be performed promptly (typically within 14 days) after
reaching final grade. Each site will have different characteristics and a landscape professional or the local
jurisdiction should be contacted to determine the most suitable seed mix for a specific site. In lieu of a
specific recommendation, one of the perennial grass mixes appropriate for site conditions and growth
season listed in Table TS/PS-2 can be used. The pure live seed (PLS) rates of application recommended
in these tables are considered to be absolute minimum rates for seed applied using proper drill-seeding
equipment.
If desired for wildlife habitat or landscape diversity, shrubs such as rubber rabbitbrush (Chrysothamnus
nauseosus), fourwing saltbush (Atriplex canescens) and skunkbrush sumac (Rhus trilobata) could be
added to the upland seedmixes at 0.25, 0.5 and 1 pound PLS/acre, respectively. In riparian zones,
planting root stock of such species as American plum (Prunus americana), woods rose (Rosa woodsii),
plains cottonwood (Populus sargentii), and willow (Populus spp.) may be considered. On non-topsoiled
upland sites, a legume such as Ladak alfalfa at 1 pound PLS/acre can be included as a source of nitrogen
for perennial grasses.
Temporary and Permanent Seeding (TS/PS) EC-2
November 2010 Urban Drainage and Flood Control District TS/PS-3
Urban Storm Drainage Criteria Manual Volume 3
Seeding dates for the highest success probability of perennial species along the Front Range are generally
in the spring from April through early May and in the fall after the first of September until the ground
freezes. If the area is irrigated, seeding may occur in summer months, as well. See Table TS/PS-3 for
appropriate seeding dates.
Table TS/PS-1. Minimum Drill Seeding Rates for Various Temporary Annual Grasses
Speciesa
(Common name)
Growth
Seasonb
Pounds of
Pure Live Seed
(PLS)/acrec
Planting
Depth
(inches)
1. Oats Cool 35 - 50 1 - 2
2. Spring wheat Cool 25 - 35 1 - 2
3. Spring barley Cool 25 - 35 1 - 2
4. Annual ryegrass Cool 10 - 15 ½
5. Millet Warm 3 - 15 ½ - ¾
6. Sudangrass Warm 5–10 ½ - ¾
7. Sorghum Warm 5–10 ½ - ¾
8. Winter wheat Cool 20–35 1 - 2
9. Winter barley Cool 20–35 1 - 2
10. Winter rye Cool 20–35 1 - 2
11. Triticale Cool 25–40 1 - 2
a Successful seeding of annual grass resulting in adequate plant growth will
usually produce enough dead-plant residue to provide protection from
wind and water erosion for an additional year. This assumes that the cover
is not disturbed or mowed closer than 8 inches.
Hydraulic seeding may be substituted for drilling only where slopes are
steeper than 3:1 or where access limitations exist. When hydraulic
seeding is used, hydraulic mulching should be applied as a separate
operation, when practical, to prevent the seeds from being encapsulated in
the mulch.
b See Table TS/PS-3 for seeding dates. Irrigation, if consistently applied,
may extend the use of cool season species during the summer months.
c Seeding rates should be doubled if seed is broadcast, or increased by 50
percent if done using a Brillion Drill or by hydraulic seeding.
EC-2 Temporary and Permanent Seeding (TS/PS)
TS/PS-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Table TS/PS-2. Minimum Drill Seeding Rates for Perennial Grasses
Commona
Name
Botanical
Name
Growth
Seasonb
Growth
Form
Seeds/
Pound
Pounds of
PLS/acre
Alakali Soil Seed Mix
Alkali sacaton Sporobolus airoides Cool Bunch 1,750,000 0.25
Basin wildrye Elymus cinereus Cool Bunch 165,000 2.5
Sodar streambank wheatgrass Agropyron riparium 'Sodar' Cool Sod 170,000 2.5
Jose tall wheatgrass Agropyron elongatum 'Jose' Cool Bunch 79,000 7.0
Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 5.5
Total 17.75
Fertile Loamy Soil Seed Mix
Ephriam crested wheatgrass Agropyron cristatum
'Ephriam' Cool Sod 175,000 2.0
Dural hard fescue Festuca ovina 'duriuscula' Cool Bunch 565,000 1.0
Lincoln smooth brome Bromus inermis leyss
'Lincoln' Cool Sod 130,000 3.0
Sodar streambank wheatgrass Agropyron riparium 'Sodar' Cool Sod 170,000 2.5
Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 7.0
Total 15.5
High Water Table Soil Seed Mix
Meadow foxtail Alopecurus pratensis Cool Sod 900,000 0.5
Redtop Agrostis alba Warm Open sod 5,000,000 0.25
Reed canarygrass Phalaris arundinacea Cool Sod 68,000 0.5
Lincoln smooth brome Bromus inermis leyss
'Lincoln' Cool Sod 130,000 3.0
Pathfinder switchgrass Panicum virgatum
'Pathfinder' Warm Sod 389,000 1.0
Alkar tall wheatgrass Agropyron elongatum
'Alkar' Cool Bunch 79,000 5.5
Total 10.75
Transition Turf Seed Mixc
Ruebens Canadian bluegrass Poa compressa 'Ruebens' Cool Sod 2,500,000 0.5
Dural hard fescue Festuca ovina 'duriuscula' Cool Bunch 565,000 1.0
Citation perennial ryegrass Lolium perenne 'Citation' Cool Sod 247,000 3.0
Lincoln smooth brome Bromus inermis leyss
'Lincoln' Cool Sod 130,000 3.0
Total 7.5
Temporary and Permanent Seeding (TS/PS) EC-2
November 2010 Urban Drainage and Flood Control District TS/PS-5
Urban Storm Drainage Criteria Manual Volume 3
Table TS/PS-2. Minimum Drill Seeding Rates for Perennial Grasses (cont.)
Common
Name
Botanical
Name
Growth
Seasonb
Growth
Form
Seeds/
Pound
Pounds of
PLS/acre
Sandy Soil Seed Mix
Blue grama Bouteloua gracilis Warm Sod-forming
bunchgrass 825,000 0.5
Camper little bluestem Schizachyrium scoparium
'Camper' Warm Bunch 240,000 1.0
Prairie sandreed Calamovilfa longifolia Warm Open sod 274,000 1.0
Sand dropseed Sporobolus cryptandrus Cool Bunch 5,298,000 0.25
Vaughn sideoats grama Bouteloua curtipendula
'Vaughn' Warm Sod 191,000 2.0
Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 5.5
Total 10.25
Heavy Clay, Rocky Foothill Seed Mix
Ephriam crested wheatgrassd Agropyron cristatum
'Ephriam' Cool Sod 175,000 1.5
Oahe Intermediate wheatgrass Agropyron intermedium
'Oahe' Cool Sod 115,000 5.5
Vaughn sideoats gramae Bouteloua curtipendula
'Vaughn' Warm Sod 191,000 2.0
Lincoln smooth brome Bromus inermis leyss
'Lincoln' Cool Sod 130,000 3.0
Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 5.5
Total 17.5
a All of the above seeding mixes and rates are based on drill seeding followed by crimped hay or straw mulch. These rates
should be doubled if seed is broadcast and should be increased by 50 percent if the seeding is done using a Brillion Drill or is
applied through hydraulic seeding. Hydraulic seeding may be substituted for drilling only where slopes are steeper than 3:1.
If hydraulic seeding is used, hydraulic mulching should be done as a separate operation.
b See Table TS/PS-3 for seeding dates.
c If site is to be irrigated, the transition turf seed rates should be doubled.
d Crested wheatgrass should not be used on slopes steeper than 6H to 1V.
e Can substitute 0.5 lbs PLS of blue grama for the 2.0 lbs PLS of Vaughn sideoats grama.
EC-2 Temporary and Permanent Seeding (TS/PS)
TS/PS-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Table TS/PS-3. Seeding Dates for Annual and Perennial Grasses
Annual Grasses
(Numbers in table reference
species in Table TS/PS-1)
Perennial Grasses
Seeding Dates Warm Cool Warm Cool
January 1–March 15
March 16–April 30 4 1,2,3
May 1–May 15 4
May 16–June 30 4,5,6,7
July 1–July 15 5,6,7
July 16–August 31
September 1–September 30 8,9,10,11
October 1–December 31
Mulch
Cover seeded areas with mulch or an appropriate rolled erosion control product to promote establishment
of vegetation. Anchor mulch by crimping, netting or use of a non-toxic tackifier. See the Mulching BMP
Fact Sheet for additional guidance.
Maintenance and Removal
Monitor and observe seeded areas to identify areas of poor growth or areas that fail to germinate. Reseed
and mulch these areas, as needed.
An area that has been permanently seeded should have a good stand of vegetation within one growing
season if irrigated and within three growing seasons without irrigation in Colorado. Reseed portions of
the site that fail to germinate or remain bare after the first growing season.
Seeded areas may require irrigation, particularly during extended dry periods. Targeted weed control may
also be necessary.
Protect seeded areas from construction equipment and vehicle access.
Soil Binders (SB) EC-3
November 2010 Urban Drainage and Flood Control District SB-1
Urban Storm Drainage Criteria Manual Volume 3
Description
Soil binders include a broad range of
treatments that can be applied to exposed
soils for temporary stabilization to reduce
wind and water erosion. Soil binders may
be applied alone or as tackifiers in
conjunction with mulching and seeding
applications.
Acknowledgement: This BMP Fact Sheet
has been adapted from the 2003
California Stormwater Quality
Association (CASQA) Stormwater BMP
Handbook: Construction
(www.cabmphandbooks.com).
Appropriate Uses
Soil binders can be used for short-term, temporary stabilization of soils on both mild and steep slopes.
Soil binders are often used in areas where work has temporarily stopped, but is expected to resume before
revegetation can become established. Binders are also useful on stockpiled soils or where temporary or
permanent seeding has occurred.
Prior to selecting a soil binder, check with the state and local jurisdiction to ensure that the chemicals
used in the soil binders are allowed. The water quality impacts of some types of soil binders are relatively
unknown and may not be allowed due to concerns about potential environmental impacts. Soil binders
must be environmentally benign (non-toxic to plant and animal life), easy to apply, easy to maintain,
economical, and should not stain paved or painted surfaces.
Soil binders should not be used in vehicle or pedestrian high traffic areas, due to loss in effectiveness
under these conditions.
Site soil type will dictate appropriate soil binders to be used. Be aware that soil binders may not function
effectively on silt or clay soils or highly compacted areas. Check manufacturer's recommendations for
appropriateness with regard to soil conditions. Some binders may not be suitable for areas with existing
vegetation.
Design and Installation
Properties of common soil binders used for erosion control
are provided in Table SB-1. Design and installation
guidance below are provided for general reference. Follow
the manufacturer's instructions for application rates and
procedures.
Soil Binders
Functions
Erosion Control Yes
Sediment Control No
Site/Material Management Moderate
Photograph SB-1. Tackifier being applied to provide temporary soil
stabilization. Photo courtesy of Douglas County.
EC-3 Soil Binders (SB)
SB-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Table SB-1. Properties of Soil Binders for Erosion Control (Source: CASQA 2003)
Evaluation Criteria
Binder Type
Plant Material
Based
(short lived)
Plant Material
Based
(long lived)
Polymeric
Emulsion Blends
Cementitious-
Based Binders
Resistance to Leaching High High Low to Moderate Moderate
Resistance to Abrasion Moderate Low Moderate to High Moderate to High
Longevity Short to Medium Medium Medium to Long Medium
Minimum Curing Time
before Rain 9 to 18 hours 19 to 24 hours 0 to 24 hours 4 to 8 hours
Compatibility with
Existing Vegetation Good Poor Poor Poor
Mode of Degradation Biodegradable Biodegradable Photodegradable/
Chemically
Degradable
Photodegradable/
Chemically
Degradable
Specialized Application
Equipment
Water Truck or
Hydraulic
Mulcher
Water Truck or
Hydraulic
Mulcher
Water Truck or
Hydraulic Mulcher
Water Truck or
Hydraulic Mulcher
Liquid/Powder Powder Liquid Liquid/Powder Powder
Surface Crusting Yes, but
dissolves on
rewetting
Yes Yes, but dissolves on
rewetting Yes
Clean Up Water Water Water Water
Erosion Control
Application Rate Varies Varies Varies 4,000 to 12,000
lbs/acre Typ.
Soil Binders (SB) EC-3
November 2010 Urban Drainage and Flood Control District SB-3
Urban Storm Drainage Criteria Manual Volume 3
Factors to consider when selecting a soil binder generally include:
Suitability to situation: Consider where the soil binder will be applied, if it needs a high resistance
to leaching or abrasion, and whether it needs to be compatible with existing vegetation. Determine
the length of time soil stabilization will be needed, and if the soil binder will be placed in an area
where it will degrade rapidly. In general, slope steepness is not a discriminating factor.
Soil types and surface materials: Fines and moisture content are key properties of surface
materials. Consider a soil binder's ability to penetrate, likelihood of leaching, and ability to form a
surface crust on the surface materials.
Frequency of application: The frequency of application can be affected by subgrade conditions,
surface type, climate, and maintenance schedule. Frequent applications could lead to high costs.
Application frequency may be minimized if the soil binder has good penetration, low evaporation,
and good longevity. Consider also that frequent application will require frequent equipment clean up.
An overview of major categories of soil binders, corresponding to the types included in Table SB-1
follows.
Plant-Material Based (Short Lived) Binders
Guar: A non-toxic, biodegradable, natural galactomannan-based hydrocolloid treated with dispersant
agents for easy field mixing. It should be mixed with water at the rate of 11 to 15 lbs per 1,000
gallons. Recommended minimum application rates are provided in Table SB-2.
Table SB-2. Application Rates for Guar Soil Stabilizer
Slope (H:V)
Flat 4:1 3:1 2:1 1:1
Application Rate (lb/acre) 40 45 50 60 70
Psyllium: Composed of the finely ground muciloid coating of plantago seeds that is applied as a wet
slurry to the surface of the soil. It dries to form a firm but rewettable membrane that binds soil
particles together but permits germination and growth of seed. Psyllium requires 12 to 18 hours
drying time. Application rates should be from 80 to 200 lbs/acre, with enough water in solution to
allow for a uniform slurry flow.
Starch: Non-ionic, cold-water soluble (pre-gelatinized) granular cornstarch. The material is mixed
with water and applied at the rate of 150 lb/acre. Approximate drying time is 9 to 12 hours.
Plant-Material Based (Long Lived) Binders
Pitch and Rosin Emulsion: Generally, a non-ionic pitch and rosin emulsion has a minimum solids
content of 48 percent. The rosin should be a minimum of 26 percent of the total solids content. The
soil stabilizer should be a non-corrosive, water dilutable emulsion that upon application cures to a
water insoluble binding and cementing agent. For soil erosion control applications, the emulsion is
diluted and should be applied as follows:
o For clayey soil: 5 parts water to 1 part emulsion
EC-3 Soil Binders (SB)
SB-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
o For sandy soil: 10 parts water to 1 part emulsion
Application can be by water truck or hydraulic seeder with the emulsion and product mixture applied
at the rate specified by the manufacturer.
Polymeric Emulsion Blend Binders
Acrylic Copolymers and Polymers: Polymeric soil stabilizers should consist of a liquid or solid
polymer or copolymer with an acrylic base that contains a minimum of 55 percent solids. The
polymeric compound should be handled and mixed in a manner that will not cause foaming or should
contain an anti-foaming agent. The polymeric emulsion should not exceed its shelf life or expiration
date; manufacturers should provide the expiration date. Polymeric soil stabilizer should be readily
miscible in water, non-injurious to seed or animal life, non-flammable, should provide surface soil
stabilization for various soil types without inhibiting water infiltration, and should not re-emulsify
when cured. The applied compound should air cure within a maximum of 36 to 48 hours. Liquid
copolymer should be diluted at a rate of 10 parts water to 1 part polymer and the mixture applied to
soil at a rate of 1,175 gallons/acre.
Liquid Polymers of Methacrylates and Acrylates: This material consists of a tackifier/sealer that is
a liquid polymer of methacrylates and acrylates. It is an aqueous 100 percent acrylic emulsion blend
of 40 percent solids by volume that is free from styrene, acetate, vinyl, ethoxylated surfactants or
silicates. For soil stabilization applications, it is diluted with water in accordance with manufacturer's
recommendations, and applied with a hydraulic seeder at the rate of 20 gallons/acre. Drying time is
12 to 18 hours after application.
Copolymers of Sodium Acrylates and Acrylamides: These materials are non-toxic, dry powders
that are copolymers of sodium acrylate and acrylamide. They are mixed with water and applied to the
soil surface for erosion control at rates that are determined by slope gradient, as summarized in Table
SB-3.
Table SB-3. Application Rates for Copolymers of Sodium Acrylates and Acrylamides
Slope (H:V)
Flat to 5:1 5:1 to 3:1 2:2 to 1:1
Application Rate (lb/acre) 3.0-5.0 5.0-10.0 10.0-20.0
Polyacrylamide and Copolymer of Acrylamide: Linear copolymer polyacrylamide is packaged as
a dry flowable solid. When used as a stand-alone stabilizer, it is diluted at a rate of 11 lb/1,000 gal. of
water and applied at the rate of 5.0 lb/acre.
Hydrocolloid Polymers: Hydrocolloid Polymers are various combinations of dry flowable
polyacrylamides, copolymers, and hydrocolloid polymers that are mixed with water and applied to the
soil surface at rates of 55 to 60 lb/acre. Drying times are 0 to 4 hours.
Cementitious-Based Binders
Gypsum: This formulated gypsum based product readily mixes with water and mulch to form a thin
protective crust on the soil surface. It is composed of high purity gypsum that is ground, calcined and
processed into calcium sulfate hemihydrate with a minimum purity of 86 percent. It is mixed in a
hydraulic seeder and applied at rates 4,000 to 12,000 lb/acre. Drying time is 4 to 8 hours.
Soil Binders (SB) EC-3
November 2010 Urban Drainage and Flood Control District SB-5
Urban Storm Drainage Criteria Manual Volume 3
Installation
After selecting an appropriate soil binder, the untreated soil surface must be prepared before applying the
soil binder. The untreated soil surface must contain sufficient moisture to assist the agent in achieving
uniform distribution. In general, the following steps should be followed:
Follow manufacturer's written recommendations for application rates, pre-wetting of application area,
and cleaning of equipment after use.
Prior to application, roughen embankment and fill areas.
Consider the drying time for the selected soil binder and apply with sufficient time before anticipated
rainfall. Soil binders should not be applied during or immediately before rainfall.
Avoid over spray onto roads, sidewalks, drainage channels, sound walls, existing vegetation, etc.
Soil binders should not be applied to frozen soil, areas with standing water, under freezing or rainy
conditions, or when the temperature is below 40°F during the curing period.
More than one treatment is often necessary, although the second treatment may be diluted or have a
lower application rate.
Generally, soil binders require a minimum curing time of 24 hours before they are fully effective.
Refer to manufacturer's instructions for specific cure time.
For liquid agents:
o Crown or slope ground to avoid ponding.
o Uniformly pre-wet ground at 0.03 to 0.3 gal/yd2 or according to manufacturer's recommendations.
o Apply solution under pressure. Overlap solution 6 to 12 in.
o Allow treated area to cure for the time recommended by the manufacturer, typically at least 24
hours.
o Apply second treatment before first treatment becomes ineffective, using 50 percent application
rate.
o In low humidity, reactivate chemicals by re-wetting with water at 0.1 to 0.2 gal/yd2.
Maintenance and Removal
Soil binders tend to break down due to natural weathering. Weathering rates depend on a variety of site-
specific and product characteristics. Consult the manufacturer for recommended reapplication rates and
reapply the selected soil binder as needed to maintain effectiveness.
Soil binders can fail after heavy rainfall events and may require reapplication. In particular, soil binders
will generally experience spot failures during heavy rainfall events. If runoff penetrates the soil at the top
of a slope treated with a soil binder, it is likely that the runoff will undercut the stabilized soil layer and
discharge at a point further down slope.
EC-3 Soil Binders (SB)
SB-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Areas where erosion is evident should be repaired and soil binder or other stabilization reapplied, as
needed. Care should be exercised to minimize the damage to protected areas while making repairs.
Most binders biodegrade after exposure to sun, oxidation, heat and biological organisms; therefore,
removal of the soil binder is not typically required.
Mulching (MU) EC-4
November 2010 Urban Drainage and Flood Control District MU-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph MU-1. An area that was recently seeded, mulched,
and crimped.
Description
Mulching consists of evenly applying
straw, hay, shredded wood mulch, bark or
compost to disturbed soils and securing
the mulch by crimping, tackifiers, netting
or other measures. Mulching helps reduce
erosion by protecting bare soil from
rainfall impact, increasing infiltration, and
reducing runoff. Although often applied
in conjunction with temporary or
permanent seeding, it can also be used for
temporary stabilization of areas that
cannot be reseeded due to seasonal
constraints.
Mulch can be applied either using
standard mechanical dry application
methods or using hydromulching equipment
that hydraulically applies a slurry of water,
wood fiber mulch, and often a tackifier.
Appropriate Uses
Use mulch in conjunction with seeding to help protect the seedbed and stabilize the soil. Mulch can also
be used as a temporary cover on low to mild slopes to help temporarily stabilize disturbed areas where
growing season constraints prevent effective reseeding. Disturbed areas should be properly mulched and
tacked, or seeded, mulched and tacked promptly after final grade is reached (typically within no longer
than 14 days) on portions of the site not otherwise permanently stabilized.
Standard dry mulching is encouraged in most jurisdictions; however, hydromulching may not be allowed
in certain jurisdictions or may not be allowed near waterways.
Do not apply mulch during windy conditions.
Design and Installation
Prior to mulching, surface-roughen areas by rolling with a crimping or punching type roller or by track
walking. Track walking should only be used where other methods are impractical because track walking
with heavy equipment typically compacts the soil.
A variety of mulches can be used effectively at construction
sites, including the following types:
Mulch
Functions
Erosion Control Yes
Sediment Control Moderate
Site/Material Management No
EC-4 Mulching (MU)
MU-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Clean, weed- and seed-free, long-stemmed grass hay (preferred) or cereal grain straw. Hay is preferred
because it is less susceptible to removal by wind. Mulch should be applied evenly at a rate of 2 tons per
acre and must be tacked or fastened by an approved method suitable for the type of mulch used. At least
50 percent of the grass hay mulch, by weight, should be 10 inches or more in length.
Grass hay mulch must be anchored and not merely placed on the surface. This can be accomplished
mechanically by crimping or with the aid of tackifiers or nets. Anchoring with a crimping implement is
preferred, and is the recommended method for areas flatter than 3:1. Mechanical crimpers must be
capable of tucking the long mulch fibers into the soil to a depth of 3 inches without cutting them. An
agricultural disk, while not an ideal substitute, may work if the disk blades are dull or blunted and set
vertically; however, the frame may have to be weighted to afford proper soil penetration.
On small areas sheltered from the wind and heavy runoff, spraying a tackifier on the mulch is satisfactory
for holding it in place. For steep slopes and special situations where greater control is needed, erosion
control blankets anchored with stakes should be used instead of mulch.
Hydraulic mulching consists of wood cellulose fibers mixed with water and a tackifying agent and should
be applied at a rate of no less than 1,500 pounds per acre (1,425 lbs of fibers mixed with at least 75 lbs of
tackifier) with a hydraulic mulcher. For steeper slopes, up to 2000 pounds per acre may be required for
effective hydroseeding. Hydromulch typically requires up to 24 hours to dry; therefore, it should not be
applied immediately prior to inclement weather. Application to roads, waterways and existing vegetation
should be avoided.
Erosion control mats, blankets, or nets are recommended to help stabilize steep slopes (generally 3:1 and
steeper) and waterways. Depending on the product, these may be used alone or in conjunction with grass
or straw mulch. Normally, use of these products will be restricted to relatively small areas.
Biodegradable mats made of straw and jute, straw-coconut, coconut fiber, or excelsior can be used instead
of mulch. (See the ECM/TRM BMP for more information.)
Some tackifiers or binders may be used to anchor mulch. Check with the local jurisdiction for allowed
tackifiers. Manufacturer's recommendations should be followed at all times. (See the Soil Binder BMP
for more information on general types of tackifiers.)
Rock can also be used as mulch. It provides protection of exposed soils to wind and water erosion and
allows infiltration of precipitation. An aggregate base course can be spread on disturbed areas for
temporary or permanent stabilization. The rock mulch layer should be thick enough to provide full
coverage of exposed soil on the area it is applied.
Maintenance and Removal
After mulching, the bare ground surface should not be more than 10 percent exposed. Reapply mulch, as
needed, to cover bare areas.
Compost Blanket and Filter Berm (CB) EC-5
November 2010 Urban Drainage and Flood Control District CB-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph CB-1. Application of a compost
blanket to a disturbed area. Photo courtesy of
Caltrans.
Description
A compost blanket is a layer of compost uniformly applied
to the soil in disturbed areas to control erosion, facilitate
revegetation, and retain sediment resulting from sheet-flow
runoff.
A compost filter berm is a dike of compost or a compost
product that is placed perpendicular to runoff to control
erosion in disturbed areas and retain sediment. Compost
berms can be placed at regular intervals to help reduce the
formation of rill and gully erosion when a compost blanket
is stabilizing a slope.
Appropriate Uses
Compost blankets can be used as an alternative to erosion
control blankets and mulching to help stabilize disturbed
areas where sheet flow conditions are present. Compost
blankets should not be used in areas of concentrated flows.
Compost provides an excellent source of nutrients for plant
growth, and should be considered for use in areas that will be
permanently vegetated.
Design and Installation
See Detail CB-1 for design details and notes.
Do not place compost in areas where it can easily be transported into drainage pathways or waterways.
When using a compost blanket on a slope, berms should be installed periodically to reduce the potential
for concentrated flow and rilling. Seeding should be completed before an area is composted or
incorporated into the compost.
Compost quality is an important consideration when selecting compost blankets or berms. Representative
compost quality factors include pH, salinity, moisture content, organic matter content, stability (maturity),
and physical contaminants. The compost should meet all local, state, and federal quality requirements.
Biosolids compost must meet the Standards for Class A biosolids outlined in 40 CFR Part 503. The U.S.
Composting Council (USCC) certifies compost products under its Seal of Testing Assurance (STA)
Program. Compost producers whose products have been certified through the STA Program provide
customers with a standard product label that allows comparison between compost products. Only STA
certified, Class I compost should be used.
Compost Blankets and Berms
Functions
Erosion Control Yes
Sediment Control Moderate
Site/Material Management No
EC-5 Compost Blanket and Filter Berm (CB)
CB-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Maintenance and Removal
When rills or gullies develop in an area that has been composted, fill and cover the area with additional
compost and install berms as necessary to help reduce erosion.
Weed control can be a maintenance challenge in areas using compost blankets. A weed control strategy
may be necessary, including measures such as mechanical removal and spot application of targeted
herbicides by licensed applicators.
For compost berms, accumulated sediments should be removed from behind the berm when the sediments
reach approximately one third the height of the berm. Areas that have been washed away should be
replaced. If the berm has experienced significant or repeated washouts, a compost berm may not be the
appropriate BMP for this area.
Compost blankets and berms biodegrade and do not typically require removal following site stabilization.
Compost Blanket and Filter Berm (CB) EC-5
November 2010 Urban Drainage and Flood Control District CB-3
Urban Storm Drainage Criteria Manual Volume 3
EC-5 Compost Blanket and Filter Berm (CB)
CB-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Rolled Erosion Control Products (RECP) EC-6
November 2010 Urban Drainage and Flood Control District RECP-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph RECP-1. Erosion control blanket protecting the slope from
erosion and providing favorable conditions for revegetation.
Description
Rolled Erosion Control Products
(RECPs) include a variety of
temporary or permanently installed
manufactured products designed to
control erosion and enhance vegetation
establishment and survivability,
particularly on slopes and in channels.
For applications where natural
vegetation alone will provide sufficient
permanent erosion protection,
temporary products such as netting,
open weave textiles and a variety of
erosion control blankets (ECBs) made
of biodegradable natural materials
(e.g., straw, coconut fiber) can be used.
For applications where natural
vegetation alone will not be sustainable under expected flow conditions, permanent rolled erosion control
products such as turf reinforcement mats (TRMs) can be used. In particular, turf reinforcement mats are
designed for discharges that exert velocities and sheer stresses that exceed the typical limits of mature
natural vegetation.
Appropriate Uses
RECPs can be used to control erosion in conjunction with revegetation efforts, providing seedbed
protection from wind and water erosion. These products are often used on disturbed areas on steep
slopes, in areas with highly erosive soils, or as part of drainageway stabilization. In order to select the
appropriate RECP for site conditions, it is important to have a general understanding of the general types
of these products, their expected longevity, and general characteristics.
The Erosion Control Technology Council (ECTC 2005) characterizes rolled erosion control products
according to these categories:
Mulch control netting: A planar woven natural fiber or extruded geosynthetic mesh used as a
temporary degradable rolled erosion control product to anchor loose fiber mulches.
Open weave textile: A temporary degradable rolled erosion control product composed of processed
natural or polymer yarns woven into a matrix, used to provide erosion control and facilitate
vegetation establishment.
Erosion control blanket (ECB): A temporary
degradable rolled erosion control product composed of
processed natural or polymer fibers which are
mechanically, structurally or chemically bound together
to form a continuous matrix to provide erosion control
and facilitate vegetation establishment. ECBs can be
further differentiated into rapidly degrading single-net
and double-net types or slowly degrading types.
Rolled Erosion Control Products
Functions
Erosion Control Yes
Sediment Control No
Site/Material Management No
EC-6 Rolled Erosion Control Products (RECP)
RECP-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Turf Reinforcement Mat (TRM): A rolled erosion control product composed of non-degradable
synthetic fibers, filaments, nets, wire mesh, and/or other elements, processed into a permanent, three-
dimensional matrix of sufficient thickness. TRMs, which may be supplemented with degradable
components, are designed to impart immediate erosion protection, enhance vegetation establishment
and provide long-term functionality by permanently reinforcing vegetation during and after
maturation. Note: TRMs are typically used in hydraulic applications, such as high flow ditches and
channels, steep slopes, stream banks, and shorelines, where erosive forces may exceed the limits of
natural, unreinforced vegetation or in areas where limited vegetation establishment is anticipated.
Tables RECP-1 and RECP-2 provide guidelines for selecting rolled erosion control products appropriate
to site conditions and desired longevity. Table RECP-1 is for conditions where natural vegetation alone
will provide permanent erosion control, whereas Table RECP-2 is for conditions where vegetation alone
will not be adequately stable to provide long-term erosion protection due to flow or other conditions.
Rolled Erosion Control Products (RECP) EC-6
November 2010 Urban Drainage and Flood Control District RECP-3
Urban Storm Drainage Criteria Manual Volume 3
Table RECP-1. ECTC Standard Specification for Temporary Rolled Erosion Control Products
(Adapted from Erosion Control Technology Council 2005)
Product Description Slope
Applications*
Channel
Applications*
Minimum
Tensile
Strength1
Expected
Longevity
Maximum
Gradient C Factor2,5 Max. Shear
Stress3,4,6
Mulch Control Nets 5:1 (H:V) ≤0.10 @
5:1
0.25 lbs/ft2
(12 Pa)
5 lbs/ft
(0.073 kN/m)
Up to 12
months
Netless Rolled
Erosion Control
Blankets
4:1 (H:V) ≤0.10 @
4:1
0.5 lbs/ft2
(24 Pa)
5 lbs/ft
(0.073 kN/m)
Single-net Erosion
Control Blankets &
Open Weave Textiles
3:1 (H:V) ≤0.15 @
3:1
1.5 lbs/ft2
(72 Pa)
50 lbs/ft
(0.73 kN/m)
Double-net Erosion
Control Blankets 2:1 (H:V) ≤0.20 @
2:1
1.75 lbs/ft2
(84 Pa)
75 lbs/ft
(1.09 kN/m)
Mulch Control Nets 5:1 (H:V) ≤0.10 @
5:1
0.25 lbs/ft2
(12 Pa)
25 lbs/ft
(0.36 kN/m) 24 months
Erosion Control
Blankets & Open
Weave Textiles
(slowly degrading)
1.5:1 (H:V) ≤0.25 @
1.5:1
2.00 lbs/ft2
(96 Pa)
100 lbs/ft
(1.45 kN/m) 24 months
Erosion Control
Blankets & Open
Weave Textiles
1:1 (H:V) ≤0.25 @
1:1
2.25 lbs/ft2
(108 Pa)
125 lbs/ft
(1.82 kN/m) 36 months
* C Factor and shear stress for mulch control nettings must be obtained with netting used in conjunction
with pre-applied mulch material. (See Section 5.3 of Chapter 7 Construction BMPs for more information
on the C Factor.)
1 Minimum Average Roll Values, Machine direction using ECTC Mod. ASTM D 5035.
2 C Factor calculated as ratio of soil loss from RECP protected slope (tested at specified or greater
gradient, H:V) to ratio of soil loss from unprotected (control) plot in large-scale testing.
3 Required minimum shear stress RECP (unvegetated) can sustain without physical damage or excess
erosion (> 12.7 mm (0.5 in) soil loss) during a 30-minute flow event in large-scale testing.
4 The permissible shear stress levels established for each performance category are based on historical
experience with products characterized by Manning's roughness coefficients in the range of 0.01 - 0.05.
5 Acceptable large-scale test methods may include ASTM D 6459, or other independent testing deemed
acceptable by the engineer.
6 Per the engineer’s discretion. Recommended acceptable large-scale testing protocol may include ASTM
D 6460, or other independent testing deemed acceptable by the engineer.
EC-6 Rolled Erosion Control Products (RECP)
RECP-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Table RECP-2. ECTC Standard Specification for Permanent1 Rolled Erosion Control Products
(Adapted from: Erosion Control Technology Council 2005)
Product Type Slope
Applications Channel Applications
TRMs with a minimum thickness of
0.25 inches (6.35 mm) per ASTM D
6525 and UV stability of 80% per
ASTM D 4355 (500 hours
exposure).
Maximum
Gradient
Maximum
Shear Stress4,5
Minimum
Tensile
Strength2,3
0.5:1 (H:V) 6.0 lbs/ft2 (288 Pa) 125 lbs/ft (1.82
kN/m)
0.5:1 (H:V) 8.0 lbs/ft2 (384 Pa) 150 lbs/ft (2.19
kN/m)
0.5:1 (H:V) 10.0 lbs/ft2 (480 Pa) 175 lbs/ft (2.55
kN/m)
1 For TRMs containing degradable components, all property values must be obtained on the non-
degradable portion of the matting alone.
2 Minimum Average Roll Values, machine direction only for tensile strength determination using ASTM
D 6818 (Supersedes Mod. ASTM D 5035 for RECPs)
3 Field conditions with high loading and/or high survivability requirements may warrant the use of a TRM
with a tensile strength of 44 kN/m (3,000 lb/ft) or greater.
4 Required minimum shear stress TRM (fully vegetated) can sustain without physical damage or excess
erosion (> 12.7 mm (0.5 in.) soil loss) during a 30-minute flow event in large scale testing.
5 Acceptable large-scale testing protocols may include ASTM D 6460, or other independent testing
deemed acceptable by the engineer.
Design and Installation
RECPs should be installed according to manufacturer’s specifications and guidelines. Regardless of the
type of product used, it is important to ensure no gaps or voids exist under the material and that all
corners of the material are secured using stakes and trenching. Continuous contact between the product
and the soil is necessary to avoid failure. Never use metal stakes to secure temporary erosion control
products. Often wooden stakes are used to anchor RECPs; however, wood stakes may present installation
and maintenance challenges and generally take a long time to biodegrade. Some local jurisdictions have
had favorable experiences using biodegradable stakes.
This BMP Fact Sheet provides design details for several commonly used ECB applications, including:
ECB-1 Pipe Outlet to Drainageway
ECB-2 Small Ditch or Drainageway
ECB-3 Outside of Drainageway
Rolled Erosion Control Products (RECP) EC-6
November 2010 Urban Drainage and Flood Control District RECP-5
Urban Storm Drainage Criteria Manual Volume 3
Staking patterns are also provided in the design details according to these factors:
ECB type
Slope or channel type
For other types of RECPs including TRMs, these design details are intended to serve as general
guidelines for design and installation; however, engineers should adhere to manufacturer’s installation
recommendations.
Maintenance and Removal
Inspection of erosion control blankets and other RECPs includes:
Check for general signs of erosion, including voids beneath the mat. If voids are apparent, fill the
void with suitable soil and replace the erosion control blanket, following the appropriate staking
pattern.
Check for damaged or loose stakes and secure loose portions of the blanket.
Erosion control blankets and other RECPs that are biodegradable typically do not need to be removed
after construction. If they must be removed, then an alternate soil stabilization method should be installed
promptly following removal.
Turf reinforcement mats, although generally resistant to biodegradation, are typically left in place as a
dense vegetated cover grows in through the mat matrix. The turf reinforcement mat provides long-term
stability and helps the established vegetation resist erosive forces.
EC-6 Rolled Erosion Control Products (RECP)
RECP-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Rolled Erosion Control Products (RECP) EC-6
November 2010 Urban Drainage and Flood Control District RECP-7
Urban Storm Drainage Criteria Manual Volume 3
EC-6 Rolled Erosion Control Products (RECP)
RECP-8 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Rolled Erosion Control Products (RECP) EC-6
November 2010 Urban Drainage and Flood Control District RECP-9
Urban Storm Drainage Criteria Manual Volume 3
Temporary Slope Drains (TSD) EC-7
November 2010 Urban Drainage and Flood Control District SD-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph TSD-1. A temporary slope drain installed to convey runoff down a slope during construction. Photo
courtesy of the City of Aurora.
Description
A temporary slope drain is a pipe or culvert used to convey water down a slope where there is a high
potential for erosion. A drainage channel or swale at the top of the slope typically directs upgradient
runoff to the pipe entrance for conveyance down the slope. The pipe outlet must be equipped with outlet
protection.
Appropriate Uses
Use on long, steep slopes when there is a high potential of flow concentration or rill development.
Design and Installation
Effective use of temporary slope drains involves design of an effective collection system to direct flows to
the pipe, proper sizing and anchoring of the pipe, and outlet protection. Upgradient of the temporary
slope drain, a temporary drainage ditch or swale should be constructed to collect surface runoff from the
drainage area and convey it to the drain entrance. The temporary slope drain must be sized to safely
convey the desired flow volume. At a minimum, it should be sized to convey the 2-year, 24-hour storm.
Temporary slope drains may be constructed of flexible or rigid pipe, riprap, or heavy (30 mil) plastic
lining. When piping is used, it must be properly anchored by burying it with adequate cover or by using
an anchor system to secure it to the ground.
The discharge from the slope drain must be directed to a stabilized outlet, temporary or permanent
channel, and/or sedimentation basin.
See Detail TSD-1 for additional sizing and design
information.
Temporary Slope Drains
Functions
Erosion Control Yes
Sediment Control No
Site/Material Management No
EC-7 Temporary Slope Drains (TSD)
SD-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Maintenance and Removal
Inspect the entrance for sediment accumulation and remove, as needed. Clogging as a result of sediment
deposition at the entrance can lead to ponding upstream causing flooding or overtopping of the slope
drain. Inspect the downstream outlet for signs of erosion and stabilize, as needed. It may also be
necessary to remove accumulated sediment at the outfall. Inspect pipe anchors to ensure that they are
secure. If the pipe is secured by ground cover, ensure erosion has not compromised the depth of cover.
Slope drains should be removed when no longer needed or just prior to installation of permanent slope
stabilization measures that cannot be installed with the slope drain in place. When slope drains are
removed, the disturbed areas should be covered with topsoil, seeded, mulched or otherwise stabilized as
required by the local jurisdiction.
Temporary Slope Drains (TSD) EC-7
November 2010 Urban Drainage and Flood Control District SD-3
Urban Storm Drainage Criteria Manual Volume 3
EC-7 Temporary Slope Drains (TSD)
SD-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Temporary Outlet Protection (TOP) EC-8
November 2010 Urban Drainage and Flood Control District TOP-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph TOP-1. Riprap outlet protection.
Description
Outlet protection helps to reduce erosion
immediately downstream of a pipe,
culvert, slope drain, rundown or other
conveyance with concentrated, high-
velocity flows. Typical outlet protection
consists of riprap or rock aprons at the
conveyance outlet.
Appropriate Uses
Outlet protection should be used when a
conveyance discharges onto a disturbed
area where there is potential for accelerated
erosion due to concentrated flow. Outlet
protection should be provided where the velocity at the culvert outlet exceeds the maximum permissible
velocity of the material in the receiving channel.
Note: This Fact Sheet and detail are for temporary outlet protection, outlets that are intended to be used
for less than 2 years. For permanent, long-term outlet protection, see the Major Drainage chapter of
Volume 1.
Design and Installation
Design outlet protection to handle runoff from the largest drainage area that may be contributing runoff
during construction (the drainage area may change as a result of grading). Key in rock, around the entire
perimeter of the apron, to a minimum depth of 6 inches for stability. Extend riprap to the height of the
culvert or the normal flow depth of the downstream channel, whichever is less. Additional erosion
control measures such as vegetative lining, turf reinforcement mat and/or other channel lining methods
may be required downstream of the outlet protection if the channel is susceptible to erosion. See Design
Detail OP-1 for additional information.
Maintenance and Removal
Inspect apron for damage and displaced rocks. If rocks are missing or significantly displaced, repair or
replace as necessary. If rocks are continuously missing or displaced, consider increasing the size of the
riprap or deeper keying of the perimeter.
Remove sediment accumulated at the outlet before the outlet protection becomes buried and ineffective.
When sediment accumulation is noted, check that upgradient BMPs, including inlet protection, are in
effective operating condition.
Outlet protection may be removed once the pipe is no longer
draining an upstream area, or once the downstream area has
been sufficiently stabilized. If the drainage pipe is
permanent, outlet protection can be left in place; however,
permanent outlet protection should be designed and
constructed in accordance with the requirements of the
Major Drainage chapter of Volume 2.
Outlet Protection
Functions
Erosion Control Yes
Sediment Control Moderate
Site/Material Management No
EC-8 Temporary Outlet Protection (TOP)
TOP-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Temporary Outlet Protection (TOP) EC-8
November 2010 Urban Drainage and Flood Control District TOP-3
Urban Storm Drainage Criteria Manual Volume 3
Rough Cut Street Control (RCS) EC-9
November 2010 Urban Drainage and Flood Control District RCS-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph RCS-1. Rough cut street controls.
Description
Rough cut street controls are rock or
earthen berms placed along dirt roadways
that are under construction or used for
construction access. These temporary
berms intercept sheet flow and divert
runoff from the roadway, and control
erosion by minimizing concentration of
flow and reducing runoff velocity.
Appropriate Uses
Appropriate uses include:
Temporary dirt construction roadways
that have not received roadbase.
Roadways under construction that will not be paved within 14 days of final grading, and that have not
yet received roadbase.
Design and Installation
Rough cut street controls are designed to redirect sheet flow off the dirt roadway to prevent water from
concentrating and eroding the soil. These controls consist of runoff barriers that are constructed at
intervals along the road. These barriers are installed perpendicular to the longitudinal slope from the
outer edge of the roadside swale to the crown of the road. The barriers are positioned alternately from the
right and left side of the road to allow construction traffic to pass in the lane not barred. If construction
traffic is expected to be congested and a vehicle tracking control has been constructed, rough-cut street
controls may be omitted for 400 feet from the entrance. Runoff from the controls should be directed to
another stormwater BMP such as a roadside swale with check dams once removed from the roadway. See
Detail RCS-1 for additional information.
Maintenance and Removal
Inspect street controls for erosion and stability. If rills are forming in the roadway or cutting through the
control berms, place the street controls at shorter intervals. If earthen berms are used, periodic
recompaction may be necessary. When rock berms are used,
repair and/or replace as necessary when damaged. Street
controls may be removed 14 days prior to road surfacing and
paving.
Rough Cut Street Control
Functions Erosion Control Yes
Sediment Control Moderate
Site/Material Management No
EC-9 Rough Cut Street Control (RCS)
RCS-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Rough Cut Street Control (RCS) EC-9
November 2010 Urban Drainage and Flood Control District RCS-3
Urban Storm Drainage Criteria Manual Volume 3
Earth Dikes and Drainage Swales (ED/DS) EC-10
November 2010 Urban Drainage and Flood Control District ED/DS-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph ED/DS-1. Example of an earth dike used to divert
flows at a construction site. Photo courtesy of CDOT.
Description
Earth dikes and drainage swales are
temporary storm conveyance channels
constructed either to divert runoff around
slopes or to convey runoff to additional
sediment control BMPs prior to discharge
of runoff from a site. Drainage swales
may be lined or unlined, but if an unlined
swale is used, it must be well compacted
and capable of resisting erosive velocities.
Appropriate Uses
Earth dikes and drainage swales are
typically used to control the flow path of
runoff at a construction site by diverting
runoff around areas prone to erosion, such
as steep slopes. Earth dikes and drainage
swales may also be constructed as
temporary conveyance features. This will
direct runoff to additional sediment control
treatment BMPs, such as sediment traps or
basins.
Design and Installation
When earth dikes are used to divert water for slope protection, the earth dike typically consists of a
horizontal ridge of soil placed perpendicular to the slope and angled slightly to provide drainage along the
contour. The dike is used in conjunction with a swale or a small channel upslope of the berm to convey
the diverted water. Temporary diversion dikes can be constructed by excavation of a V-shaped trench or
ditch and placement of the fill on the downslope side of the cut. There are two types of placement for
temporary slope diversion dikes:
A dike located at the top of a slope to divert upland runoff away from the disturbed area and convey it
in a temporary or permanent channel.
A diversion dike located at the base or mid-slope of a disturbed area to intercept runoff and reduce the
effective slope length.
Depending on the project, either an earth dike or drainage swale may be more appropriate. If there is a
need for cut on the project, then an excavated drainage
swale may be better suited. When the project is primarily
fill, then a conveyance constructed using a berm may be the
better option.
All dikes or swales receiving runoff from a disturbed
area should direct stormwater to a sediment control
BMP such as a sediment trap or basin.
Earth Dikes and Drainage Swales
Functions
Erosion Control Yes
Sediment Control Moderate
Site/Material Management No
EC-10 Earth Dikes and Drainage Swales (ED/DS)
ED/DS-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Unlined dikes or swales should only be used for intercepting sheet flow runoff and are not intended
for diversion of concentrated flows.
Details with notes are provided for several design variations, including:
ED-1. Unlined Earth Dike formed by Berm
DS-1. Unlined Excavated Swale
DS-2. Unlined Swale Formed by Cut and Fill
DS-3. ECB-lined Swale
DS-4. Synthetic-lined Swale
DS-5. Riprap-lined Swale
The details also include guidance on permissible velocities for cohesive channels if unlined approaches
will be used.
Maintenance and Removal
Inspect earth dikes for stability, compaction, and signs of erosion and repair. Inspect side slopes for
erosion and damage to erosion control fabric. Stabilize slopes and repair fabric as necessary. If there is
reoccurring extensive damage, consider installing rock check dams or lining the channel with riprap.
If drainage swales are not permanent, remove dikes and fill channels when the upstream area is stabilized.
Stabilize the fill or disturbed area immediately following removal by revegetation or other permanent
stabilization method approved by the local jurisdiction.
Earth Dikes and Drainage Swales (ED/DS) EC-10
November 2010 Urban Drainage and Flood Control District ED/DS-3
Urban Storm Drainage Criteria Manual Volume 3
EC-10 Earth Dikes and Drainage Swales (ED/DS)
ED/DS-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Earth Dikes and Drainage Swales (ED/DS) EC-10
November 2010 Urban Drainage and Flood Control District ED/DS-5
Urban Storm Drainage Criteria Manual Volume 3
Terracing (TER) EC-11
November 2010 Urban Drainage and Flood Control District TER-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph TER-1. Use of a terrace to reduce erosion by controlling
slope length on a long, steep slope. Photo courtesy of Douglas
County.
Description
Terracing involves grading steep slopes
into a series of relatively flat sections, or
terraces, separated at intervals by steep
slope segments. Terraces shorten the
uninterrupted flow lengths on steep
slopes, helping to reduce the
development of rills and gullies.
Retaining walls, gabions, cribbing,
deadman anchors, rock-filled slope
mattresses, and other types of soil
retention systems can be used in
terracing.
Appropriate Uses
Terracing techniques are most typically used to control erosion on slopes that are steeper than 4:1.
Design and Installation
Design details with notes are provided in Detail TER-1.
The type, number, and spacing of terraces will depend on the slope, slope length, and other factors. The
Revised Universal Soil Loss Equation (RUSLE) may be helpful in determining spacing of terraces on
slopes. Terracing should be used in combination with other stabilization measures that provide cover for
exposed soils such as mulching, seeding, surface roughening, or other measures.
Maintenance and Removal
Repair rill erosion on slopes and remove accumulated sediment, as needed. Terracing may be temporary
or permanent. If terracing is temporary, the slope should be topsoiled, seeded, and mulched when the
slope is graded to its final configuration and terraces are removed. Due to the steepness of the slope, once
terraces are graded, erosion control blankets or other stabilization measures are typically required. If
terraces are permanent, vegetation should be established on slopes and terraces as soon as practical.
Terracing
Functions
Erosion Control Yes
Sediment Control Moderate
Site/Material Management No
EC-11 Terracing (TER)
TER-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Check Dams (CD) EC-12
November 2010 Urban Drainage and Flood Control District CD-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph CD-1. Rock check dams in a roadside ditch. Photo
courtesy of WWE.
Description
Check dams are temporary grade control
structures placed in drainage channels to
limit the erosivity of stormwater by
reducing flow velocity. Check dams are
typically constructed from rock, gravel
bags, sand bags, or sometimes,
proprietary devices. Reinforced check
dams are typically constructed from rock
and wire gabion. Although the primary
function of check dams is to reduce the
velocity of concentrated flows, a
secondary benefit is sediment trapping
upstream of the structure.
Appropriate Uses
Use as a grade control for temporary drainage ditches or swales until final soil stabilization measures are
established upstream and downstream. Check dams can be used on mild or moderately steep slopes.
Check dams may be used under the following conditions:
As temporary grade control facilities along waterways until final stabilization is established.
Along permanent swales that need protection prior to installation of a non-erodible lining.
Along temporary channels, ditches or swales that need protection where construction of a non-
erodible lining is not practicable.
Reinforced check dams should be used in areas subject to high flow velocities.
Design and Installation
Place check dams at regularly spaced intervals along the drainage swale or ditch. Check dams heights
should allow for pools to develop upstream of each check dam, extending to the downstream toe of the
check dam immediately upstream.
When rock is used for the check dam, place rock mechanically or by hand. Do not dump rocks into the
drainage channel. Where multiple check dams are used, the top of the lower dam should be at the same
elevation as the toe of the upper dam.
When reinforced check dams are used, install erosion control fabric under and around the check dam to
prevent erosion on the upstream and downstream sides. Each
section of the dam should be keyed in to reduce the potential
for washout or undermining. A rock apron upstream and
downstream of the dam may be necessary to further control
erosion.
Check Dams
Functions
Erosion Control Yes
Sediment Control Moderate
Site/Material Management No
EC-12 Check Dams (CD)
CD-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Design details with notes are provided for the following types of check dams:
Rock Check Dams (CD-1)
Reinforced Check Dams (CD-2)
Sediment control logs may also be used as check dams; however, silt fence is not appropriate for use as a
check dam. Many jurisdictions also prohibit or discourage use of straw bales for this purpose.
Maintenance and Removal
Replace missing rocks causing voids in the check dam. If gravel bags or sandbags are used, replace or
repair torn or displaced bags.
Remove accumulated sediment, as needed to maintain BMP effectiveness, typically before the sediment
depth upstream of the check dam is within ½ of the crest height. Remove accumulated sediment prior to
mulching, seeding, or chemical soil stabilization. Removed sediment can be incorporated into the
earthwork with approval from the Project Engineer, or disposed of at an alternate location in accordance
with the standard specifications.
Check dams constructed in permanent swales should be removed when perennial grasses have become
established, or immediately prior to installation of a non-erodible lining. All of the rock and accumulated
sediment should be removed, and the area seeded and mulched, or otherwise stabilized.
Check Dams (CD) EC-12
November 2010 Urban Drainage and Flood Control District CD-3
Urban Storm Drainage Criteria Manual Volume 3
EC-12 Check Dams (CD)
CD-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Check Dams (CD) EC-12
November 2010 Urban Drainage and Flood Control District CD-5
Urban Storm Drainage Criteria Manual Volume 3
EC-12 Check Dams (CD)
CD-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Streambank Stabilization (SS) EC-13
November 2010 Urban Drainage and Flood Control District SS-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph SS-1. Streambank stabilization using geotextiles
following installation of a permanent in-stream grade control structure.
Description
Streambank stabilization involves a
combination of erosion and sediment
control practices to protect streams,
banks, and in-stream habitat from
accelerated erosion. BMPs associated
with streambank stabilization may
include protection of existing
vegetation, check dams/grade control,
temporary and permanent seeding,
outlet protection, rolled erosion control
products, temporary diversions,
dewatering operations and
bioengineering practices such as brush
layering, live staking and fascines.
Appropriate Uses
Streambank stabilization may be a construction activity in and of itself, or it may be in conjunction with a
broader construction project that discharges to a waterway that is susceptible to accelerated erosion due to
increases in the rate and volume of stormwater runoff. Depending on the health of the stream, water
quality sampling and testing may be advisable prior to and/or during construction to evaluate health and
stability of the stream and potential effects from adjacent construction activities.
Design and Installation
Streambank stabilization consists of protecting the stream in a variety of ways to minimize negative
effects to the stream environment. The following lists the minimum requirements necessary for
construction streambank stabilization:
Protect existing vegetation along the stream bank in accordance with the Vegetated Buffers and
Protection of Existing Vegetation Fact Sheets. Preserving a riparian buffer along the streambank will
help to remove sediment and decrease runoff rates from the disturbed area.
Outside the riparian buffer, provide sediment control in the form of a silt fence or equivalent sediment
control practice along the entire length of the stream that will receive runoff from the area of
disturbance. In some cases, a double-layered perimeter control may be justified adjacent to sensitive
receiving waters and wetlands to provide additional protection.
Stabilize all areas that will be draining to the stream. Use rolled erosion control products, temporary
or permanent seeding, or other appropriate measures.
Ensure all point discharges entering the stream are
adequately armored with a velocity dissipation device and
appropriate outlet protection.
See individual design details and notes for the various BMPs
referenced in this practice. Additional information on
bioengineering techniques for stream stabilization can be
Streambank Stabilization
Functions
Erosion Control Yes
Sediment Control No
Site/Material Management No
EC-13 Streambank Stabilization (SS)
SS-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
found in the Major Drainage chapter of Volume 1 and additional guidance on BMPs for working in
waterways can be found in UDFCD’s Best Management Practices for Construction in Waterways
Training Manual.
Maintenance and Removal
Inspect BMPs protecting the stream for damage on a daily basis. Maintain, repair, or replace damaged
BMPs following the guidance provided in individual BMP Fact Sheets for practices that are implemented.
Some streambank stabilization BMPs are intended to remain in place as vegetation matures (e.g. erosion
control blankets protecting seeded stream banks and turf reinforcement mats).
For BMPs that are not to remain in place as a part of final stabilization such as silt fence and other
temporary measures, BMPs should be removed when all land disturbing activities have ceased and areas
have been permanently stabilized.
Wind Erosion/Dust Control (DC) EC-14
November 2010 Urban Drainage and Flood Control District DC-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph DC-1. Water truck used for dust suppression. Photo
courtesy of Douglas County.
Description
Wind erosion and dust control BMPs
help to keep soil particles from entering
the air as a result of land disturbing
construction activities. These BMPs
include a variety of practices generally
focused on either graded disturbed areas
or construction roadways. For graded
areas, practices such as seeding and
mulching, use of soil binders, site
watering, or other practices that provide
prompt surface cover should be used.
For construction roadways, road
watering and stabilized surfaces should
be considered.
Appropriate Uses
Dust control measures should be used on any site where dust poses a problem to air quality. Dust control
is important to control for the health of construction workers and surrounding waterbodies.
Design and Installation
The following construction BMPs can be used for dust control:
An irrigation/sprinkler system can be used to wet the top layer of disturbed soil to help keep dry soil
particles from becoming airborne.
Seeding and mulching can be used to stabilize disturbed surfaces and reduce dust emissions.
Protecting existing vegetation can help to slow wind velocities across the ground surface, thereby
limiting the likelihood of soil particles to become airborne.
Spray-on soil binders form a bond between soil particles keeping them grounded. Chemical
treatments may require additional permitting requirements. Potential impacts to surrounding
waterways and habitat must be considered prior to use.
Placing rock on construction roadways and entrances will help keep dust to a minimum across the
construction site.
Wind fences can be installed on site to reduce wind
speeds. Install fences perpendicular to the prevailing
wind direction for maximum effectiveness.
Maintenance and Removal
When using an irrigation/sprinkler control system to aid in
dust control, be careful not to overwater. Overwatering will
cause construction vehicles to track mud off-site.
Wind Erosion Control/
Dust Control
Functions
Erosion Control Yes
Sediment Control No
Site/Material Management Moderate
Concrete Washout Area (CWA) MM-1
November 2010 Urban Drainage and Flood Control District CWA-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph CWA-1. Example of concrete washout area. Note gravel
tracking pad for access and sign.
Description
Concrete waste management involves
designating and properly managing a
specific area of the construction site as a
concrete washout area. A concrete
washout area can be created using one of
several approaches designed to receive
wash water from washing of tools and
concrete mixer chutes, liquid concrete
waste from dump trucks, mobile batch
mixers, or pump trucks. Three basic
approaches are available: excavation of a
pit in the ground, use of an above ground
storage area, or use of prefabricated haul-
away concrete washout containers.
Surface discharges of concrete washout
water from construction sites are prohibited.
Appropriate Uses
Concrete washout areas must be designated on all sites that will generate concrete wash water or liquid
concrete waste from onsite concrete mixing or concrete delivery.
Because pH is a pollutant of concern for washout activities, when unlined pits are used for concrete
washout, the soil must have adequate buffering capacity to result in protection of state groundwater
standards; otherwise, a liner/containment must be used. The following management practices are
recommended to prevent an impact from unlined pits to groundwater:
The use of the washout site should be temporary (less than 1 year), and
The washout site should be not be located in an area where shallow groundwater may be present, such
as near natural drainages, springs, or wetlands.
Design and Installation
Concrete washout activities must be conducted in a manner that does not contribute pollutants to surface
waters or stormwater runoff. Concrete washout areas may be lined or unlined excavated pits in the
ground, commercially manufactured prefabricated washout containers, or aboveground holding areas
constructed of berms, sandbags or straw bales with a plastic liner.
Although unlined washout areas may be used, lined pits may be required to protect groundwater under
certain conditions.
Do not locate an unlined washout area within 400 feet
of any natural drainage pathway or waterbody or
within 1,000 feet of any wells or drinking water
sources. Even for lined concrete washouts, it is
advisable to locate the facility away from waterbodies
and drainage paths. If site constraints make these
Concrete Washout Area
Functions
Erosion Control No
Sediment Control No
Site/Material Management Yes
MM-1 Concrete Washout Area (CWA)
CWA-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
setbacks infeasible or if highly permeable soils exist in the area, then the pit must be installed with an
impermeable liner (16 mil minimum thickness) or surface storage alternatives using prefabricated
concrete washout devices or a lined aboveground storage area should be used.
Design details with notes are provided in Detail CWA-1 for pits and CWA-2 for aboveground storage
areas. Pre-fabricated concrete washout container information can be obtained from vendors.
Maintenance and Removal
A key consideration for concrete washout areas is to ensure that adequate signage is in place identifying
the location of the washout area. Part of inspecting and maintaining washout areas is ensuring that
adequate signage is provided and in good repair and that the washout area is being used, as opposed to
washout in non-designated areas of the site.
Remove concrete waste in the washout area, as needed to maintain BMP function (typically when filled to
about two-thirds of its capacity). Collect concrete waste and deliver offsite to a designated disposal
location.
Upon termination of use of the washout site, accumulated solid waste, including concrete waste and any
contaminated soils, must be removed from the site to prevent on-site disposal of solid waste. If the wash
water is allowed to evaporate and the concrete hardens, it may be recycled.
Photograph CWA-3. Earthen concrete washout. Photo
courtesy of CDOT.
Photograph CWA-2. Prefabricated concrete washout. Photo
courtesy of CDOT.
Concrete Washout Area (CWA) MM-1
November 2010 Urban Drainage and Flood Control District CWA-3
Urban Storm Drainage Criteria Manual Volume 3
MM-1 Concrete Washout Area (CWA)
CWA-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Stockpile Management (SP) MM-2
November 2010 Urban Drainage and Flood Control District SP-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph SP-1. A topsoil stockpile that has been partially
revegetated and is protected by silt fence perimeter control.
Description
Stockpile management includes
measures to minimize erosion and
sediment transport from soil stockpiles.
Appropriate Uses
Stockpile management should be used
when soils or other erodible materials
are stored at the construction site.
Special attention should be given to
stockpiles in close proximity to natural
or manmade storm systems.
Design and Installation
Locate stockpiles away from all drainage system components including storm sewer inlets. Where
practical, choose stockpile locations that that will remain undisturbed for the longest period of time as the
phases of construction progress. Place sediment control BMPs around the perimeter of the stockpile, such
as sediment control logs, rock socks, silt fence, straw bales and sand bags. See Detail SP-1 for guidance
on proper establishment of perimeter controls around a stockpile. For stockpiles in active use, provide a
stabilized designated access point on the upgradient side of the stockpile.
Stabilize the stockpile surface with surface roughening, temporary seeding and mulching, erosion control
blankets, or soil binders. Soils stockpiled for an extended period (typically for more than 60 days) should
be seeded and mulched with a temporary grass cover once the stockpile is placed (typically within 14
days). Use of mulch only or a soil binder is acceptable if the stockpile will be in place for a more limited
time period (typically 30-60 days). Timeframes for stabilization of stockpiles noted in this fact sheet are
"typical" guidelines. Check permit requirements for specific federal, state, and/or local requirements that
may be more prescriptive.
Stockpiles should not be placed in streets or paved areas unless no other practical alternative exists. See
the Stabilized Staging Area Fact Sheet for guidance when staging in roadways is unavoidable due to
space or right-of-way constraints. For paved areas, rock socks must be used for perimeter control and all
inlets with the potential to receive sediment from the stockpile (even from vehicle tracking) must be
protected.
Maintenance and Removal
Inspect perimeter controls and inlet protection in accordance with their respective BMP Fact Sheets.
Where seeding, mulch and/or soil binders are used, reseeding or reapplication of soil binder may be
necessary.
When temporary removal of a perimeter BMP is necessary
to access a stockpile, ensure BMPs are reinstalled in
accordance with their respective design detail section.
Stockpile Management
Functions
Erosion Control Yes
Sediment Control Yes
Site/Material Management Yes
MM-2 Stockpile Management (SM)
SP-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
When the stockpile is no longer needed, properly dispose of excess materials and revegetate or otherwise
stabilize the ground surface where the stockpile was located.
Stockpile Management (SP) MM-2
November 2010 Urban Drainage and Flood Control District SP-3
Urban Storm Drainage Criteria Manual Volume 3
MM-2 Stockpile Management (SM)
SP-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Stockpile Management (SP) MM-2
November 2010 Urban Drainage and Flood Control District SP-5
Urban Storm Drainage Criteria Manual Volume 3
MM-2 Stockpile Management (SM)
SP-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Good Housekeeping Practices (GH) MM-3
November 2010 Urban Drainage and Flood Control District GH-1
Urban Storm Drainage Criteria Manual Volume 3
Photographs GH-1 and GH-2. Proper materials
storage and secondary containment for fuel tanks
are important good housekeeping practices. Photos
courtesy of CDOT and City of Aurora.
Description
Implement construction site good housekeeping practices to
prevent pollution associated with solid, liquid and hazardous
construction-related materials and wastes. Stormwater
Management Plans (SWMPs) should clearly specify BMPs
including these good housekeeping practices:
Provide for waste management.
Establish proper building material staging areas.
Designate paint and concrete washout areas.
Establish proper equipment/vehicle fueling and
maintenance practices.
Control equipment/vehicle washing and allowable non-
stormwater discharges.
Develop a spill prevention and response plan.
Acknowledgement: This Fact Sheet is based directly on
EPA guidance provided in Developing Your Stormwater
Pollution Prevent Plan (EPA 2007).
Appropriate Uses
Good housekeeping practices are necessary at all construction sites.
Design and Installation
The following principles and actions should be addressed in SWMPs:
Provide for Waste Management. Implement management procedures and practices to prevent or
reduce the exposure and transport of pollutants in stormwater from solid, liquid and sanitary wastes
that will be generated at the site. Practices such as trash disposal, recycling, proper material handling,
and cleanup measures can reduce the potential for stormwater runoff to pick up construction site
wastes and discharge them to surface waters. Implement a comprehensive set of waste-management
practices for hazardous or toxic materials, such as paints, solvents, petroleum products, pesticides,
wood preservatives, acids, roofing tar, and other materials. Practices should include storage,
handling, inventory, and cleanup procedures, in case of spills. Specific practices that should be
considered include:
Solid or Construction Waste
o Designate trash and bulk waste-collection areas on-
site.
Good Housekeeping
Functions
Erosion Control No
Sediment Control No
Site/Material Management Yes
MM-3 Good Housekeeping Practices (GH)
GH-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Photograph GH-3. Locate portable toilet facilities on level
surfaces away from waterways and storm drains. Photo
courtesy of WWE.
o Recycle materials whenever possible (e.g., paper, wood, concrete, oil).
o Segregate and provide proper disposal options for hazardous material wastes.
o Clean up litter and debris from the construction site daily.
o Locate waste-collection areas away from streets, gutters, watercourses, and storm drains. Waste-
collection areas (dumpsters, and such) are often best located near construction site entrances to
minimize traffic on disturbed soils. Consider secondary containment around waste collection
areas to minimize the likelihood of contaminated discharges.
o Empty waste containers before they are full and overflowing.
Sanitary and Septic Waste
o Provide convenient, well-maintained, and properly located toilet facilities on-site.
o Locate toilet facilities away from storm drain inlets and waterways to prevent accidental spills
and contamination of stormwater.
o Maintain clean restroom facilities and empty portable toilets regularly.
o Where possible, provide secondary containment pans under portable toilets.
o Provide tie-downs or stake-downs for portable toilets.
o Educate employees, subcontractors, and suppliers on locations of facilities.
o Treat or dispose of sanitary and septic waste in accordance with state or local regulations. Do not
discharge or bury wastewater at the construction site.
o Inspect facilities for leaks. If found, repair or replace immediately.
o Special care is necessary during maintenance (pump out) to ensure that waste and/or biocide are
not spilled on the ground.
Hazardous Materials and Wastes
o Develop and implement employee and
subcontractor education, as needed, on
hazardous and toxic waste handling,
storage, disposal, and cleanup.
o Designate hazardous waste-collection
areas on-site.
o Place all hazardous and toxic material
wastes in secondary containment.
Good Housekeeping Practices (GH) MM-3
November 2010 Urban Drainage and Flood Control District GH-3
Urban Storm Drainage Criteria Manual Volume 3
o Hazardous waste containers should be inspected to ensure that all containers are labeled properly
and that no leaks are present.
Establish Proper Building Material Handling and Staging Areas. The SWMP should include
comprehensive handling and management procedures for building materials, especially those that are
hazardous or toxic. Paints, solvents, pesticides, fuels and oils, other hazardous materials or building
materials that have the potential to contaminate stormwater should be stored indoors or under cover
whenever possible or in areas with secondary containment. Secondary containment measures prevent
a spill from spreading across the site and may include dikes, berms, curbing, or other containment
methods. Secondary containment techniques should also ensure the protection of groundwater.
Designate staging areas for activities such as fueling vehicles, mixing paints, plaster, mortar, and
other potential pollutants. Designated staging areas enable easier monitoring of the use of materials
and clean up of spills. Training employees and subcontractors is essential to the success of this
pollution prevention principle. Consider the following specific materials handling and staging
practices:
o Train employees and subcontractors in proper handling and storage practices.
o Clearly designate site areas for staging and storage with signs and on construction drawings.
Staging areas should be located in areas central to the construction site. Segment the staging area
into sub-areas designated for vehicles, equipment, or stockpiles. Construction entrances and exits
should be clearly marked so that delivery vehicles enter/exit through stabilized areas with vehicle
tracking controls (See Vehicle Tracking Control Fact Sheet).
o Provide storage in accordance with Spill Protection, Control and Countermeasures (SPCC)
requirements and plans and provide cover and impermeable perimeter control, as necessary, for
hazardous materials and contaminated soils that must be stored on site.
o Ensure that storage containers are regularly inspected for leaks, corrosion, support or foundation
failure, or other signs of deterioration and tested for soundness.
o Reuse and recycle construction materials when possible.
Designate Concrete Washout Areas. Concrete contractors should be encouraged to use the washout
facilities at their own plants or dispatch facilities when feasible; however, concrete washout
commonly occurs on construction sites. If it is necessary to provide for concrete washout areas on-
site, designate specific washout areas and design facilities to handle anticipated washout water.
Washout areas should also be provided for paint and stucco operations. Because washout areas can
be a source of pollutants from leaks or spills, care must be taken with regard to their placement and
proper use. See the Concrete Washout Area Fact Sheet for detailed guidance.
Both self-constructed and prefabricated washout containers can fill up quickly when concrete, paint,
and stucco work are occurring on large portions of the site. Be sure to check for evidence that
contractors are using the washout areas and not dumping materials onto the ground or into drainage
facilities. If the washout areas are not being used regularly, consider posting additional signage,
relocating the facilities to more convenient locations, or providing training to workers and
contractors.
When concrete, paint, or stucco is part of the construction process, consider these practices which will
help prevent contamination of stormwater. Include the locations of these areas and the maintenance
and inspection procedures in the SWMP.
MM-3 Good Housekeeping Practices (GH)
GH-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
o Do not washout concrete trucks or equipment into storm drains, streets, gutters, uncontained
areas, or streams. Only use designated washout areas.
o Establish washout areas and advertise their locations with signs. Ensure that signage remains in
good repair.
o Provide adequate containment for the amount of wash water that will be used.
o Inspect washout structures daily to detect leaks or tears and to identify when materials need to be
removed.
o Dispose of materials properly. The preferred method is to allow the water to evaporate and to
recycle the hardened concrete. Full service companies may provide dewatering services and
should dispose of wastewater properly. Concrete wash water can be highly polluted. It should
not be discharged to any surface water, storm sewer system, or allowed to infiltrate into the
ground in the vicinity of waterbodies. Washwater should not be discharged to a sanitary sewer
system without first receiving written permission from the system operator.
Establish Proper Equipment/Vehicle Fueling and Maintenance Practices. Create a clearly
designated on-site fueling and maintenance area that is clean and dry. The on-site fueling area should
have a spill kit, and staff should know how to use it. If possible, conduct vehicle fueling and
maintenance activities in a covered area. Consider the following practices to help prevent the
discharge of pollutants to stormwater from equipment/vehicle fueling and maintenance. Include the
locations of designated fueling and maintenance areas and inspection and maintenance procedures in
the SWMP.
o Train employees and subcontractors in proper fueling procedures (stay with vehicles during
fueling, proper use of pumps, emergency shutoff valves, etc.).
o Inspect on-site vehicles and equipment regularly for leaks, equipment damage, and other service
problems.
o Clearly designate vehicle/equipment service areas away from drainage facilities and watercourses
to prevent stormwater run-on and runoff.
o Use drip pans, drip cloths, or absorbent pads when replacing spent fluids.
o Collect all spent fluids, store in appropriate labeled containers in the proper storage areas, and
recycle fluids whenever possible.
Control Equipment/Vehicle Washing and Allowable Non-Stormwater Discharges. Implement
practices to prevent contamination of surface and groundwater from equipment and vehicle wash
water. Representative practices include:
o Educate employees and subcontractors on proper washing procedures.
o Use off-site washing facilities, when available.
o Clearly mark the washing areas and inform workers that all washing must occur in this area.
o Contain wash water and treat it using BMPs. Infiltrate washwater when possible, but maintain
separation from drainage paths and waterbodies.
Good Housekeeping Practices (GH) MM-3
November 2010 Urban Drainage and Flood Control District GH-5
Urban Storm Drainage Criteria Manual Volume 3
o Use high-pressure water spray at vehicle washing facilities without detergents. Water alone can
remove most dirt adequately.
o Do not conduct other activities, such as vehicle repairs, in the wash area.
o Include the location of the washing facilities and the inspection and maintenance procedures in
the SWMP.
Develop a Spill Prevention and Response Plan. Spill prevention and response procedures must be
identified in the SWMP. Representative procedures include identifying ways to reduce the chance of
spills, stop the source of spills, contain and clean up spills, dispose of materials contaminated by
spills, and train personnel responsible for spill prevention and response. The plan should also specify
material handling procedures and storage requirements and ensure that clear and concise spill cleanup
procedures are provided and posted for areas in which spills may potentially occur. When developing
a spill prevention plan, include the following:
o Note the locations of chemical storage areas, storm drains, tributary drainage areas, surface
waterbodies on or near the site, and measures to stop spills from leaving the site.
o Provide proper handling and safety procedures for each type of waste. Keep Material Safety Data
Sheets (MSDSs) for chemical used on site with the SWMP.
o Establish an education program for employees and subcontractors on the potential hazards to
humans and the environment from spills and leaks.
o Specify how to notify appropriate authorities, such as police and fire departments, hospitals, or
municipal sewage treatment facilities to request assistance. Emergency procedures and contact
numbers should be provided in the SWMP and posted at storage locations.
o Describe the procedures, equipment and materials for immediate cleanup of spills and proper
disposal.
o Identify personnel responsible for implementing the plan in the event of a spill. Update the spill
prevention plan and clean up materials as changes occur to the types of chemicals stored and used
at the facility.
MM-3 Good Housekeeping Practices (GH)
GH-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Spill Prevention, Control, and Countermeasure (SPCC) Plan
Construction sites may be subject to 40 CFR Part 112 regulations that require the preparation and
implementation of a SPCC Plan to prevent oil spills from aboveground and underground storage tanks.
The facility is subject to this rule if it is a non-transportation-related facility that:
Has a total storage capacity greater than 1,320 gallons or a completely buried storage capacity
greater than 42,000 gallons.
Could reasonably be expected to discharge oil in quantities that may be harmful to navigable waters
of the United States and adjoining shorelines.
Furthermore, if the facility is subject to 40 CFR Part 112, the SWMP should reference the SPCC Plan.
To find out more about SPCC Plans, see EPA's website on SPPC at www.epa.gov/oilspill/spcc.htm.
Reporting Oil Spills
In the event of an oil spill, contact the National Response Center toll free at 1-800-424- 8802 for
assistance, or for more details, visit their website: www.nrc.uscg.mil.
Maintenance and Removal
Effective implementation of good housekeeping practices is dependent on clear designation of personnel
responsible for supervising and implementing good housekeeping programs, such as site cleanup and
disposal of trash and debris, hazardous material management and disposal, vehicle and equipment
maintenance, and other practices. Emergency response "drills" may aid in emergency preparedness.
Checklists may be helpful in good housekeeping efforts.
Staging and storage areas require permanent stabilization when the areas are no longer being used for
construction-related activities.
Construction-related materials, debris and waste must be removed from the construction site once
construction is complete.
Design Details
See the following Fact Sheets for related Design Details:
MM-1 Concrete Washout Area
MM-2 Stockpile Management
SM-4 Vehicle Tracking Control
Design details are not necessary for other good housekeeping practices; however, be sure to designate
where specific practices will occur on the appropriate construction drawings.
Silt Fence (SF) SC-1
November 2010 Urban Drainage and Flood Control District SF-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph SF-1. Silt fence creates a sediment barrier, forcing
sheet flow runoff to evaporate or infiltrate.
Description
A silt fence is a woven geotextile fabric
attached to wooden posts and trenched
into the ground. It is designed as a
sediment barrier to intercept sheet flow
runoff from disturbed areas.
Appropriate Uses
A silt fence can be used where runoff is
conveyed from a disturbed area as sheet
flow. Silt fence is not designed to
receive concentrated flow or to be used
as a filter fabric. Typical uses include:
Down slope of a disturbed area to
accept sheet flow.
Along the perimeter of a receiving
water such as a stream, pond or
wetland.
At the perimeter of a construction site.
Design and Installation
Silt fence should be installed along the contour of slopes so that it intercepts sheet flow. The maximum
recommended tributary drainage area per 100 lineal feet of silt fence, installed along the contour, is
approximately 0.25 acres with a disturbed slope length of up to 150 feet and a tributary slope gradient no
steeper than 3:1. Longer and steeper slopes require additional measures. This recommendation only
applies to silt fence installed along the contour. Silt fence installed for other uses, such as perimeter
control, should be installed in a way that will not produce concentrated flows. For example, a "J-hook"
installation may be appropriate to force runoff to pond and evaporate or infiltrate in multiple areas rather
than concentrate and cause erosive conditions parallel to the silt fence.
See Detail SF-1 for proper silt fence installation, which involves proper trenching, staking, securing the
fabric to the stakes, and backfilling the silt fence. Properly installed silt fence should not be easily pulled
out by hand and there should be no gaps between the ground and the fabric.
Silt fence must meet the minimum allowable strength requirements, depth of installation requirement, and
other specifications in the design details. Improper installation
of silt fence is a common reason for silt fence failure; however,
when properly installed and used for the appropriate purposes, it
can be highly effective.
Silt Fence
Functions
Erosion Control No
Sediment Control Yes
Site/Material Management No
SC-1 Silt Fence (SF)
SF-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Photograph SF-2. When silt fence is not installed along
the contour, a "J-hook" installation may be appropriate
to ensure that the BMP does not create concentrated
flow parallel to the silt fence. Photo courtesy of Tom
Gore.
Maintenance and Removal
Inspection of silt fence includes observing the
material for tears or holes and checking for slumping
fence and undercut areas bypassing flows. Repair of
silt fence typically involves replacing the damaged
section with a new section. Sediment accumulated
behind silt fence should be removed, as needed to
maintain BMP effectiveness, typically before it
reaches a depth of 6 inches.
Silt fence may be removed when the upstream area
has reached final stabilization.
Silt Fence (SF) SC-1
November 2010 Urban Drainage and Flood Control District SF-3
Urban Storm Drainage Criteria Manual Volume 3
SC-1 Silt Fence (SF)
SF-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Sediment Control Log (SCL) SC-2
November 2010 Urban Drainage and Flood Control District SCL-1
Urban Storm Drainage Criteria Manual Volume 3
Photographs SCL-1 and SCL-2. Sediment control logs used as 1) a
perimeter control around a soil stockpile; and, 2) as a "J-hook"
perimeter control at the corner of a construction site.
Description
A sediment control log is a linear roll
made of natural materials such as
straw, coconut fiber, or other fibrous
material trenched into the ground and
held with a wooden stake. Sediment
control logs are also often referred to
as "straw wattles." They are used as a
sediment barrier to intercept sheet flow
runoff from disturbed areas.
Appropriate Uses
Sediment control logs can be used in
the following applications to trap
sediment:
As perimeter control for stockpiles
and the site.
As part of inlet protection designs.
As check dams in small drainage
ditches. (Sediment control logs
are not intended for use in
channels with high flow
velocities.)
On disturbed slopes to shorten flow
lengths (as an erosion control).
As part of multi-layered perimeter control along a receiving water such as a stream, pond or wetland.
Sediment control logs work well in combination with other layers of erosion and sediment controls.
Design and Installation
Sediment control logs should be installed along the contour to avoid concentrating flows. The maximum
allowable tributary drainage area per 100 lineal feet of sediment control log, installed along the contour, is
approximately 0.25 acres with a disturbed slope length of up to 150 feet and a tributary slope gradient no
steeper than 3:1. Longer and steeper slopes require additional measures. This recommendation only
applies to sediment control logs installed along the contour. When installed for other uses, such as
perimeter control, it should be installed in a way that will not
produce concentrated flows. For example, a "J-hook"
installation may be appropriate to force runoff to pond and
evaporate or infiltrate in multiple areas rather than concentrate
and cause erosive conditions parallel to the BMP.
Sediment Control Log
Functions
Erosion Control Moderate
Sediment Control Yes
Site/Material Management No
SC-2 Sediment Control Log (SCL)
SCL-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Although sediment control logs initially allow runoff to flow through the BMP, they can quickly become
a barrier and should be installed is if they are impermeable.
Design details and notes for sediment control logs are provided in Detail SCL-1. Sediment logs must be
properly trenched and staked into the ground to prevent undercutting, bypassing and displacement. When
installed on slopes, sediment control logs should be installed along the contours (i.e., perpendicular to
flow).
Improper installation can lead to poor performance. Be sure that sediment control logs are properly
trenched, anchored and tightly jointed.
Maintenance and Removal
Be aware that sediment control logs will eventually degrade. Remove accumulated sediment before the
depth is one-half the height of the sediment log and repair damage to the sediment log, typically by
replacing the damaged section.
Once the upstream area is stabilized, remove and properly dispose of the logs. Areas disturbed beneath
the logs may need to be seeded and mulched. Sediment control logs that are biodegradable may
occasionally be left in place (e.g., when logs are used in conjunction with erosion control blankets as
permanent slope breaks). However, removal of sediment control logs after final stabilization is typically
recommended when used in perimeter control, inlet protection and check dam applications.
Sediment Control Log (SCL) SC-2
November 2010 Urban Drainage and Flood Control District SCL-3
Urban Storm Drainage Criteria Manual Volume 3
SC-2 Sediment Control Log (SCL)
SCL-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Sediment Control Log (SCL) SC-2
November 2010 Urban Drainage and Flood Control District SCL-5
Urban Storm Drainage Criteria Manual Volume 3
Brush Barrier (BB) SC-4
November 2010 Urban Drainage and Flood Control District BB-1
Urban Storm Drainage Criteria Manual Volume 3
Description
A brush barrier is a perimeter sediment
control constructed with stacked shrubs,
tree limbs, and bushy vegetation that has
been cleared from a construction area.
Brush barriers reduce sediment loads by
intercepting and slowing sheet flow
from disturbed areas.
Appropriate Uses
A brush barrier is an appropriate BMP at
sites where there is adequate brush from
the clearing and grubbing of the
construction site to construct an
effective brush barrier. Brush barriers
are typically used at the toe of slopes and
should be implemented in combination
with other BMPs such as surface
roughening and reseeding. Brush barriers should be considered short-term, supplemental BMPs because
they are constructed of materials that naturally decompose. Brush barriers are not acceptable as a sole
means of perimeter control, but they may be used internally within a site to reduce slope length or at the
site perimeter in combination with other perimeter control BMPs for multi-layered protection.
Brush barriers are not appropriate for high-velocity flow areas. A large amount of material is needed to
construct a useful brush barrier; therefore, alternative perimeter controls such as a fabric silt fence may be
more appropriate for sites with little material from clearing.
Design and Installation
The drainage area for brush barriers should be no greater than 0.25 acre per 100 feet of barrier length.
Additionally, the drainage slope leading down to a brush barrier must be no greater than 3:1 and no longer
than 150 feet.
To construct an effective brush barrier, use only small shrubs and limbs with diameters of 6 inches or less.
Larger materials (such as a tree stump) can create void spaces in the barrier, making it ineffective. The
brush barrier mound should be at least 3 feet high and 5 feet wide at its base.
In order to avoid significant movement of the brush and improve effectiveness, a filter fabric can be
placed over the top of the brush pile, keyed in on the upstream side, and anchored on the downstream
side. On the upgradient side, the filter fabric cover should be
buried in a trench 4 inches deep and 6 inches wide.
Brush Barrier
Functions
Erosion Control Moderate
Sediment Control Moderate
Site/Material
No
Photograph BB-1. Brush barrier constructed with chipped wood.
Photo courtesy of EPA.
SC-4 Brush Barrier (BB)
BB-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Maintenance and Removal
Inspect the brush barrier for voids where concentrated flow or erosion is occurring. Voids in the brush
barrier should be filled with additional brush. Accumulated sediment should be removed from the uphill
side of the barrier when sediment height reaches one-third of the height of the barrier.
If filter fabric is used, inspect the filter fabric for damage; replace and properly secure it, as needed.
Once the upstream area has been vegetated or stabilized, the brush barrier should be removed and the
underlying area revegetated.
Rock Sock (RS) SC-5
November 2010 Urban Drainage and Flood Control District RS-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph RS-1. Rock socks placed at regular intervals in a curb
line can help reduce sediment loading to storm sewer inlets. Rock
socks can also be used as perimeter controls.
Description
A rock sock is constructed of gravel
that has been wrapped by wire mesh or
a geotextile to form an elongated
cylindrical filter. Rock socks are
typically used either as a perimeter
control or as part of inlet protection.
When placed at angles in the curb line,
rock socks are typically referred to as
curb socks. Rock socks are intended to
trap sediment from stormwater runoff
that flows onto roadways as a result of
construction activities.
Appropriate Uses
Rock socks can be used at the perimeter
of a disturbed area to control localized
sediment loading. A benefit of rock
socks as opposed to other perimeter controls is that they do not have to be trenched or staked into the
ground; therefore, they are often used on roadway construction projects where paved surfaces are present.
Use rock socks in inlet protection applications when the construction of a roadway is substantially
complete and the roadway has been directly connected to a receiving storm system.
Design and Installation
When rock socks are used as perimeter controls, the maximum recommended tributary drainage area per
100 lineal feet of rock socks is approximately 0.25 acres with disturbed slope length of up to 150 feet and
a tributary slope gradient no steeper than 3:1. A rock sock design detail and notes are provided in Detail
RS-1. Also see the Inlet Protection Fact Sheet for design and installation guidance when rock socks are
used for inlet protection and in the curb line.
When placed in the gutter adjacent to a curb, rock socks should protrude no more than two feet from the
curb in order for traffic to pass safely. If located in a high traffic area, place construction markers to alert
drivers and street maintenance workers of their presence.
Maintenance and Removal
Rock socks are susceptible to displacement and breaking due to vehicle traffic. Inspect rock socks for
damage and repair or replace as necessary. Remove sediment by sweeping or vacuuming as needed to
maintain the functionality of the BMP, typically when sediment
has accumulated behind the rock sock to one-half of the sock's
height.
Once upstream stabilization is complete, rock socks and
accumulated sediment should be removed and properly disposed.
Rock Sock
Functions
Erosion Control No
Sediment Control Yes
Site/Material Management No
SC-5 Rock Sock (RS)
RS-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Rock Sock (RS) SC-5
November 2010 Urban Drainage and Flood Control District RS-3
Urban Storm Drainage Criteria Manual Volume 3
Inlet Protection (IP) SC-6
November 2010 Urban Drainage and Flood Control District IP-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph IP-1. Inlet protection for a curb opening inlet.
Description
Inlet protection consists of permeable
barriers installed around an inlet to
filter runoff and remove sediment prior
to entering a storm drain inlet. Inlet
protection can be constructed from rock
socks, sediment control logs, silt fence,
block and rock socks, or other materials
approved by the local jurisdiction.
Area inlets can also be protected by
over-excavating around the inlet to
form a sediment trap.
Appropriate Uses
Install protection at storm sewer inlets
that are operable during construction.
Consider the potential for tracked-out
sediment or temporary stockpile areas to contribute sediment to inlets when determining which inlets
must be protected. This may include inlets in the general proximity of the construction area, not limited
to downgradient inlets. Inlet protection is not
Design and Installation
a stand-alone BMP and should be used in conjunction with
other upgradient BMPs.
To function effectively, inlet protection measures must be installed to ensure that flows do not bypass the
inlet protection and enter the storm drain without treatment. However, designs must also enable the inlet
to function without completely blocking flows into the inlet in a manner that causes localized flooding.
When selecting the type of inlet protection, consider factors such as type of inlet (e.g., curb or area, sump
or on-grade conditions), traffic, anticipated flows, ability to secure the BMP properly, safety and other
site-specific conditions. For example, block and rock socks will be better suited to a curb and gutter
along a roadway, as opposed to silt fence or sediment control logs, which cannot be properly secured in a
curb and gutter setting, but are effective area inlet protection measures.
Several inlet protection designs are provided in the Design Details. Additionally, a variety of proprietary
products are available for inlet protection that may be approved for use by local governments. If
proprietary products are used, design details and installation procedures from the manufacturer must be
followed. Regardless of the type of inlet protection selected, inlet protection is most effective when
combined with other BMPs such as curb socks and check dams. Inlet protection is often the last barrier
before runoff enters the storm sewer or receiving water.
Design details with notes are provided for these forms of inlet
protection:
IP-1. Block and Rock Sock Inlet Protection for Sump or On-grade
Inlets
IP-2. Curb (Rock) Socks Upstream of Inlet Protection, On-grade
Inlets
Inlet Protection
(various forms)
Functions
Erosion Control No
Sediment Control Yes
Site/Material Management No
SC-6 Inlet Protection (IP)
IP-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
IP-3. Rock Sock Inlet Protection for Sump/Area Inlet
IP-4. Silt Fence Inlet Protection for Sump/Area Inlet
IP-5. Over-excavation Inlet Protection
IP-6. Straw Bale Inlet Protection for Sump/Area Inlet
CIP-1. Culvert Inlet Protection
Propriety inlet protection devices should be installed in accordance with manufacturer specifications.
More information is provided below on selecting inlet protection for sump and on-grade locations.
Inlets Located in a Sump
When applying inlet protection in sump conditions, it is important that the inlet continue to function
during larger runoff events. For curb inlets, the maximum height of the protective barrier should be lower
than the top of the curb opening to allow overflow into the inlet during larger storms without excessive
localized flooding. If the inlet protection height is greater than the curb elevation, particularly if the filter
becomes clogged with sediment, runoff will not enter the inlet and may bypass it, possibly causing
localized flooding, public safety issues, and downstream erosion and damage from bypassed flows.
Area inlets located in a sump setting can be protected through the use of silt fence, concrete block and
rock socks (on paved surfaces), sediment control logs/straw wattles embedded in the adjacent soil and
stacked around the area inlet (on pervious surfaces), over-excavation around the inlet, and proprietary
products providing equivalent functions.
Inlets Located on a Slope
For curb and gutter inlets on paved sloping streets, block and rock sock inlet protection is recommended
in conjunction with curb socks in the gutter leading to the inlet. For inlets located along unpaved roads,
also see the Check Dam Fact Sheet.
Maintenance and Removal
Inspect inlet protection frequently. Inspection and maintenance guidance includes:
Inspect for tears that can result in sediment directly entering the inlet, as well as result in the contents
of the BMP (e.g., gravel) washing into the inlet.
Check for improper installation resulting in untreated flows bypassing the BMP and directly entering
the inlet or bypassing to an unprotected downstream inlet. For example, silt fence that has not been
properly trenched around the inlet can result in flows under the silt fence and directly into the inlet.
Look for displaced BMPs that are no longer protecting the inlet. Displacement may occur following
larger storm events that wash away or reposition the inlet protection. Traffic or equipment may also
crush or displace the BMP.
Monitor sediment accumulation upgradient of the inlet protection.
Inlet Protection (IP) SC-6
November 2010 Urban Drainage and Flood Control District IP-3
Urban Storm Drainage Criteria Manual Volume 3
Remove sediment accumulation from the area upstream of the inlet protection, as needed to maintain
BMP effectiveness, typically when it reaches no more than half the storage capacity of the inlet
protection. For silt fence, remove sediment when it accumulates to a depth of no more than 6 inches.
Remove sediment accumulation from the area upstream of the inlet protection as needed to maintain
the functionality of the BMP.
Propriety inlet protection devices should be inspected and maintained in accordance with
manufacturer specifications. If proprietary inlet insert devices are used, sediment should be removed
in a timely manner to prevent devices from breaking and spilling sediment into the storm drain.
Inlet protection must be removed and properly disposed of when the drainage area for the inlet has
reached final stabilization.
SC-6 Inlet Protection (IP)
IP-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Inlet Protection (IP) SC-6
November 2010 Urban Drainage and Flood Control District IP-5
Urban Storm Drainage Criteria Manual Volume 3
SC-6 Inlet Protection (IP)
IP-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Inlet Protection (IP) SC-6
November 2010 Urban Drainage and Flood Control District IP-7
Urban Storm Drainage Criteria Manual Volume 3
Sediment Basin (SB) SC-7
November 2010 Urban Drainage and Flood Control District SB-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph SB-1. Sediment basin at the toe of a slope. Photo
courtesy of WWE.
Description
A sediment basin is a temporary pond
built on a construction site to capture
eroded or disturbed soil transported in
storm runoff prior to discharge from the
site. Sediment basins are designed to
capture site runoff and slowly release it to
allow time for settling of sediment prior
to discharge. Sediment basins are often
constructed in locations that will later be
modified to serve as post-construction
stormwater basins.
Appropriate Uses
Most large construction sites (typically
greater than 2 acres) will require one or
more sediment basins for effective
management of construction site runoff. On linear construction projects, sediment basins may be
impractical; instead, sediment traps or other combinations of BMPs may be more appropriate.
Sediment basins should not be used as stand-alone sediment controls. Erosion and other sediment
controls should also be implemented upstream.
When feasible, the sediment basin should be installed in the same location where a permanent post-
construction detention pond will be located.
Design and Installation
The design procedure for a sediment basin includes these steps:
Basin Storage Volume: Provide a storage volume of at least 3,600 cubic feet per acre of drainage
area. To the extent practical, undisturbed and/or off-site areas should be diverted around sediment
basins to prevent “clean” runoff from mixing with runoff from disturbed areas. For undisturbed areas
(both on-site and off-site) that cannot be diverted around the sediment basin, provide a minimum of
500 ft3/acre of storage for undeveloped (but stable) off-site areas in addition to the 3,600 ft3/acre for
disturbed areas. For stable, developed areas that cannot be diverted around the sediment basin,
storage volume requirements are summarized in Table SB-1.
Basin Geometry: Design basin with a minimum length-to-width ratio of 2:1 (L:W). If this cannot be
achieved because of site space constraints, baffling may
be required to extend the effective distance between the
inflow point(s) and the outlet to minimize short-circuiting.
Dam Embankment: It is recommended that
embankment slopes be 4:1 (H:V) or flatter and no steeper
than 3:1 (H:V) in any location.
Sediment Basins
Functions
Erosion Control No
Sediment Control Yes
Site/Material Management No
SC-7 Sediment Basin (SB)
SB-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Inflow Structure: For concentrated flow entering the basin, provide energy dissipation at the point
of inflow.
Table SB-1. Additional Volume Requirements for Undisturbed and Developed TributaryAreas
Draining through Sediment Basins
Imperviousness (%)
Additional Storage Volume (ft3)
Per Acre of Tributary Area
Undeveloped 500
10 800
20 1230
30 1600
40 2030
50 2470
60 2980
70 3560
80 4360
90 5300
100 6460
Outlet Works: The outlet pipe shall extend through the embankment at a minimum slope of 0.5
percent. Outlet works can be designed using one of the following approaches:
o Perforated Riser/Plate: Follow the design criteria for Full Spectrum Detention outlets in the
EDB BMP Fact Sheet provided in Chapter 4 of this manual for sizing of outlet perforations with
an emptying time of approximately 72 hours. In lieu of the well-screen trash rack, pack
uniformly sized 1½ - to 2-inch gravel in front of the plate. This gravel will need to be cleaned out
frequently during the construction period as sediment accumulates within it. The gravel pack will
need to be removed and disposed of following construction to reclaim the basin for use as a
permanent detention facility. If the basin will be used as a permanent extended detention basin
for the site, a well-screen trash rack will need to be installed once contributing drainage areas
have been stabilized and the gravel pack and accumulated sediment have been removed.
o Floating Skimmer: If a floating skimmer is used, install it using manufacturer’s
recommendations. Illustration SB-1 provides an illustration of a Faircloth Skimmer Floating
Outlet™, one of the more commonly used floating skimmer outlets. A skimmer should be
designed to release the design volume in no less than 48 hours. The use of a floating skimmer
outlet can increase the sediment capture efficiency of a basin significantly. A floating outlet
continually decants cleanest water off the surface of the pond and releases cleaner water than
would discharge from a perforated riser pipe or plate.
Sediment Basin (SB) SC-7
November 2010 Urban Drainage and Flood Control District SB-3
Urban Storm Drainage Criteria Manual Volume 3
Illustration SB-1. Outlet structure for a temporary sediment basin - Faircloth Skimmer Floating Outlet. Illustration courtesy
of J. W. Faircloth & Sons, Inc., FairclothSkimmer.com.
o Outlet Protection: Outlet protection should be provided where the velocity of flow will exceed
the maximum permissible velocity of the material of the waterway into which discharge occurs.
This may require the use of a riprap apron at the outlet location and/or other measures to keep the
waterway from eroding.
o Emergency Spillway: Provide a stabilized emergency overflow spillway for rainstorms that
exceed the capacity of the sediment basin volume and its outlet. Protect basin embankments from
erosion and overtopping. If the sediment basin will be converted to a permanent detention basin,
design and construct the emergency spillway(s) as required for the permanent facility. If the
sediment basin will not become a permanent detention basin, it may be possible to substitute a
heavy polyvinyl membrane or properly bedded rock cover to line the spillway and downstream
embankment, depending on the height, slope, and width of the embankments.
Maintenance and Removal
Maintenance activities include the following:
• Dredge sediment from the basin, as needed to maintain BMP effectiveness, typically when the design
storage volume is no more than one-third filled with sediment.
• Inspect the sediment basin embankments for stability and seepage.
• Inspect the inlet and outlet of the basin, repair damage, and remove debris. Remove, clean and
replace the gravel around the outlet on a regular basis to remove the accumulated sediment within it
and keep the outlet functioning.
• Be aware that removal of a sediment basin may require dewatering and associated permit
requirements.
• Do not remove a sediment basin until the upstream area has been stabilized with vegetation.
SC-7 Sediment Basin (SB)
SB-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Final disposition of the sediment basin depends on whether the basin will be converted to a permanent
post-construction stormwater basin or whether the basin area will be returned to grade. For basins being
converted to permanent detention basins, remove accumulated sediment and reconfigure the basin and
outlet to meet the requirements of the final design for the detention facility. If the sediment basin is not to
be used as a permanent detention facility, fill the excavated area with soil and stabilize with vegetation.
Sediment Basin (SB) SC-7
November 2010 Urban Drainage and Flood Control District SB-5
Urban Storm Drainage Criteria Manual Volume 3
SC-7 Sediment Basin (SB)
SB-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Sediment Basin (SB) SC-7
November 2010 Urban Drainage and Flood Control District SB-7
Urban Storm Drainage Criteria Manual Volume 3
Sediment Trap (ST) SC-8
November 2010 Urban Drainage and Flood Control District ST-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph ST-1. Sediment traps are used to collect sediment-laden
runoff from disturbed area. Photo courtesy of EPA Menu of BMPs.
Description
Sediment traps are formed by excavating
an area or by placing an earthen
embankment across a low area or
drainage swale. Sediment traps are
designed to capture drainage from
disturbed areas less than one acre and
allow settling of sediment.
Appropriate Uses
Sediment traps can be used in
combination with other layers of erosion
and sediment controls to trap sediment
from small drainage areas (less than one
acre) or areas with localized high sediment loading. For example, sediment traps are often provided in
conjunction with vehicle tracking controls and wheel wash facilities.
Design and Installation
A sediment trap consists of a small excavated basin with an earthen berm and a riprap outlet. The berm
of the sediment trap may be constructed from the excavated material and must be compacted to
95 percent of the maximum density in accordance with ASTM D698. An overflow outlet must be
provided at an elevation at least 6 inches below the top of the berm. See Detail ST-1 for additional design
and installation information.
Maintenance and Removal
Inspect the sediment trap embankments for stability and seepage.
Remove accumulated sediment as needed to maintain the effectiveness of the sediment trap, typically
when the sediment depth is approximately one-half the height of the outflow embankment.
Inspect the outlet for debris and damage. Repair damage to the outlet, and remove all obstructions.
A sediment trap should not be removed until the upstream area is sufficiently stabilized. Upon removal of
the trap, the disturbed area should be covered with topsoil and stabilized.
Sediment Trap
Functions
Erosion Control No
Sediment Control Yes
Site/Material Management No
SC-8 Sediment Trap (ST)
ST-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Sediment Trap (ST) SC-8
November 2010 Urban Drainage and Flood Control District ST-3
Urban Storm Drainage Criteria Manual Volume 3
Vegetated Buffers (VB) SC-9
November 2010 Urban Drainage and Flood Control District VB-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph VB-1. A vegetated buffer is maintained between the
area of active construction and the drainage swale. Photo courtesy
of WWE.
Description
Buffer strips of preserved natural
vegetation or grass help protect
waterways and wetlands from land
disturbing activities. Vegetated buffers
improve stormwater runoff quality by
straining sediment, promoting
infiltration, and slowing runoff
velocities.
Appropriate Uses
Vegetated buffers can be used to
separate land disturbing activities and
natural surface waters or conveyances.
In many jurisdictions, local governments
require some type of setback from natural waterways. Concentrated flow should not be directed through
a buffer; instead, runoff should be in the form of sheet flow. Vegetated buffers are typically used in
combination with other perimeter control BMPs such as sediment control logs or silt fence for multi-
layered protection.
Design and Installation
Minimum buffer widths may vary based on local regulations. Clearly delineate the boundary of the
natural buffer area using construction fencing, silt fence, or a comparable technique. In areas that have
been cleared and graded, vegetated buffers such as sod can also be installed to create or restore a
vegetated buffer around the perimeter of the site.
Maintenance and Removal
Inspect buffer areas for signs of erosion such as gullies or rills. Stabilize eroding areas, as needed. If
erosion is due to concentrated flow conditions, it may be necessary to install a level spreader or other
technique to restore sheet flow conditions. Inspect perimeter controls delineating the vegetative buffer
and repair or replace as needed.
Vegetated Buffers
Functions
Erosion Control Moderate
Sediment Control Yes
Site/Material Management Yes
Chemical Treatment (CT) SC-10
November 2010 Urban Drainage and Flood Control District CT-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph CT-1. Proprietary chemical treatment system being
used on a construction site with sensitive receiving waters. Photo
courtesy of WWE.
Description
Chemical treatment for erosion and
sediment control can take several forms:
1. Applying chemicals to disturbed
surfaces to reduce erosion (these uses
are discussed in the Soil Binders Fact
Sheet).
2. Adding flocculants to sedimentation
ponds or tanks to enhance sediment
removal prior.
3. Using proprietary barriers or flow-
through devices containing flocculants
(e.g., "floc logs").
The use of flocculants as described in No. 2 and No. 3 above will likely require special permitting.
Check with the state permitting agency. See the Soil Binder BMP Fact Sheet for information on
surface application of chemical treatments, as described in No. 1.
Appropriate Uses
At sites with fine-grained materials such as clays, chemical addition to sedimentation ponds or tanks can
enhance settling of suspended materials through flocculation.
Prior to selecting and using chemical treatments, it is important to check state and local permit
requirements related to their use.
Design and Installation
Due to variations among proprietary chemical treatment methods, design details are not provided for this
BMP. Chemical feed systems for sedimentation ponds, settling tanks and dewatering bags should be
installed and operated in accordance with manufacturer's recommendations and applicable regulations.
Alum and chitosan are two common chemicals used as flocculants. Because the potential long-term
impact of these chemicals to natural drainageways is not yet fully understood, the state does not currently
allow chemical addition under the CDPS General Stormwater Construction Discharge Permit. Additional
permitting may be necessary, which may include sampling requirements and numeric discharge limits.
Any devices or barriers containing chemicals should be installed following manufacturer's guidelines.
Check for state and local jurisdiction usage restrictions and requirements before including these practices
in the SWMP and implementing them onsite.
Chemical Treatment
Functions
Erosion Control Moderate
Sediment Control Yes
Site/Material Management No
SC-10 Chemical Treatment (CT)
CT-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Maintenance and Removal
Chemical feed systems for sedimentation ponds or tanks should be maintained in accordance with
manufacturer's recommendations and removed when the systems are no longer being used. Accumulated
sediment should be dried and disposed of either at a landfill or in accordance with applicable regulations.
Barriers and devices containing chemicals should be removed and replaced when tears or other damage to
the devices are observed. These barriers should be removed and properly disposed of when the site has
been stabilized.
Construction Phasing/Sequencing (CP) SM-1
November 2010 Urban Drainage and Flood Control District CP-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph CP-1. Construction phasing to avoid disturbing the
entire area at one time. Photo courtesy of WWE.
Description
Effective construction site management
to minimize erosion and sediment
transport includes attention to
construction phasing, scheduling, and
sequencing of land disturbing activities.
On most construction projects, erosion
and sediment controls will need to be
adjusted as the project progresses and
should be documented in the SWMP.
Construction phasing refers to
disturbing only part of a site at a time to
limit the potential for erosion from
dormant parts of a site. Grading
activities and construction are completed
and soils are effectively stabilized on one
part of a site before grading and
construction begins on another portion of the site.
Construction sequencing or scheduling refers to a specified work schedule that coordinates the timing of
land disturbing activities and the installation of erosion and sediment control practices.
Appropriate Uses
All construction projects can benefit from upfront planning to phase and sequence construction activities
to minimize the extent and duration of disturbance. Larger projects and linear construction projects may
benefit most from construction sequencing or phasing, but even small projects can benefit from
construction sequencing that minimizes the duration of disturbance.
Typically, erosion and sediment controls needed at a site will change as a site progresses through the
major phases of construction. Erosion and sediment control practices corresponding to each phase of
construction must be documented in the SWMP.
Design and Installation
BMPs appropriate to the major phases of development should be identified on construction drawings. In
some cases, it will be necessary to provide several drawings showing construction-phase BMPs placed
according to stages of development (e.g., clearing and grading, utility installation, active construction,
final stabilization). Some municipalities in the Denver area set maximum sizes for disturbed area
associated with phases of a construction project. Additionally, requirements for phased construction
drawings vary among local governments within the UDFCD boundary. Some local governments require
separate erosion and sediment control drawings for initial
BMPs, interim conditions (in active construction), and final
stabilization.
Construction Scheduling
Functions
Erosion Control Moderate
Sediment Control Moderate
Site/Material Management Yes
SM-1 Construction Phasing/Sequencing (CP)
CP-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Typical construction phasing BMPs include:
Limit the amount of disturbed area at any given time on a site to the extent practical. For example, a
100-acre subdivision might be constructed in five phases of 20 acres each.
If there is carryover of stockpiled material from one phase to the next, position carryover material in a
location easily accessible for the pending phase that will not require disturbance of stabilized areas to
access the stockpile. Particularly with regard to efforts to balance cut and fill at a site, careful
planning for location of stockpiles is important.
Typical construction sequencing BMPs include:
Sequence construction activities to minimize duration of soil disturbance and exposure. For example,
when multiple utilities will occupy the same trench, schedule installation so that the trench does not
have to be closed and opened multiple times.
Schedule site stabilization activities (e.g., landscaping, seeding and mulching, installation of erosion
control blankets) as soon as feasible following grading.
Install initial erosion and sediment control practices before construction begins. Promptly install
additional BMPs for inlet protection, stabilization, etc., as construction activities are completed.
Table CP-1 provides typical sequencing of construction activities and associated BMPs.
Maintenance and Removal
When the construction schedule is altered, erosion and sediment control measures in the SWMP and
construction drawings should be appropriately adjusted to reflect actual "on the ground" conditions at the
construction site. Be aware that changes in construction schedules can have significant implications for
site stabilization, particularly with regard to establishment of vegetative cover.
Construction Phasing/Sequencing (CP) SM-1
November 2010 Urban Drainage and Flood Control District CP-3
Urban Storm Drainage Criteria Manual Volume 3
Table CP -1. Typical Phased BMP Installation for Construction Projects
Project
Phase BMPs
Pre-
disturbance,
Site Access
Install sediment controls downgradient of access point (on paved streets this may consist
of inlet protection).
Establish vehicle tracking control at entrances to paved streets. Fence as needed.
Use construction fencing to define the boundaries of the project and limit access to areas of
the site that are not to be disturbed.
Note: it may be necessary to protect inlets in the general vicinity of the site, even if not
downgradient, if there is a possibility that sediment tracked from the site could contribute
to the inlets.
Site Clearing
and Grubbing
Install perimeter controls as needed on downgradient perimeter of site (silt fence, wattles,
etc).
Limit disturbance to those areas planned for disturbance and protect undisturbed areas
within the site (construction fence, flagging, etc).
Preserve vegetative buffer at site perimeter.
Create stabilized staging area.
Locate portable toilets on flat surfaces away from drainage paths. Stake in areas
susceptible to high winds.
Construct concrete washout area and provide signage.
Establish waste disposal areas.
Install sediment basins.
Create dirt perimeter berms and/or brush barriers during grubbing and clearing.
Separate and stockpile topsoil, leave roughened and/or cover.
Protect stockpiles with perimeter control BMPs. Stockpiles should be located away from
drainage paths and should be accessed from the upgradient side so that perimeter controls
can remain in place on the downgradient side. Use erosion control blankets, temporary
seeding, and/or mulch for stockpiles that will be inactive for an extended period.
Leave disturbed area of site in a roughened condition to limit erosion. Consider temporary
revegetation for areas of the site that have been disturbed but that will be inactive for an
extended period.
Water to minimize dust but not to the point that watering creates runoff.
SM-1 Construction Phasing/Sequencing (CP)
CP-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Project
Phase BMPs
Utility And
Infrastructure
Installation
In Addition to the Above BMPs:
Close trench as soon as possible (generally at the end of the day).
Use rough-cut street control or apply road base for streets that will not be promptly paved.
Provide inlet protection as streets are paved and inlets are constructed.
Protect and repair BMPs, as necessary.
Perform street sweeping as needed.
Building
Construction
In Addition to the Above BMPs:
Implement materials management and good housekeeping practices for home building
activities.
Use perimeter controls for temporary stockpiles from foundation excavations.
For lots adjacent to streets, lot-line perimeter controls may be necessary at the back of
curb.
Final Grading
In Addition to the Above BMPs:
Remove excess or waste materials.
Remove stored materials.
Final
Stabilization
In Addition to the Above BMPs:
Seed and mulch/tackify.
Seed and install blankets on steep slopes.
Remove all temporary BMPs when site has reached final stabilization.
Protection of Existing Vegetation (PV) SM-2
November 2010 Urban Drainage and Flood Control District PV-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph PV-1. Protection of existing vegetation and a sensitive
area. Photo courtesy of CDOT.
Description
Protection of existing vegetation on a
construction site can be accomplished
through installation of a construction
fence around the area requiring protection.
In cases where upgradient areas are
disturbed, it may also be necessary to
install perimeter controls to minimize
sediment loading to sensitive areas such as
wetlands. Existing vegetation may be
designated for protection to maintain a
stable surface cover as part of construction
phasing, or vegetation may be protected in
areas designated to remain in natural
condition under post-development
conditions (e.g., wetlands, mature trees,
riparian areas, open space).
Appropriate Uses
Existing vegetation should be preserved for the maximum practical duration on a construction site
through the use of effective construction phasing. Preserving vegetation helps to minimize erosion and
can reduce revegetation costs following construction.
Protection of wetland areas is required under the Clean Water Act, unless a permit has been obtained from
the U.S. Army Corps of Engineers (USACE) allowing impacts in limited areas.
If trees are to be protected as part of post-development landscaping, care must be taken to avoid several
types of damage, some of which may not be apparent at the time of injury. Potential sources of injury
include soil compaction during grading or due to construction traffic, direct equipment-related injury such
as bark removal, branch breakage, surface grading and trenching, and soil cut and fill. In order to
minimize injuries that may lead to immediate or later death of the tree, tree protection zones should be
developed during site design, implemented at the beginning of a construction project, as well as continued
during active construction.
Design and Installation
General
Once an area has been designated as a preservation area, there should be no construction activity allowed
within a set distance of the area. Clearly mark the area with construction fencing. Do not allow
stockpiles, equipment, trailers or parking within the
protected area. Guidelines to protect various types of
existing vegetation follow.
Protection of Existing Vegetation
Functions
Erosion Control Yes
Sediment Control Moderate
Site/Material Management Yes
SM-2 Protection of Existing Vegetation (PV)
PV-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Surface Cover During Phased Construction
Install construction fencing or other perimeter controls around areas to be protected from clearing and
grading as part of construction phasing.
Maintaining surface cover on steep slopes for the maximum practical duration during construction is
recommended.
Open Space Preservation
Where natural open space areas will be preserved as part of a development, it is important to install
construction fencing around these areas to protect them from compaction. This is particularly important
when areas with soils with high infiltration rates are preserved as part of LID designs. Preserved open
space areas should not be used for staging and equipment storage.
Wetlands and Riparian Areas
Install a construction fence around the perimeter of the wetland or riparian (streamside vegetation) area to
prevent access by equipment. In areas downgradient of disturbed areas, install a perimeter control such as
silt fence, sediment control logs, or similar measure to minimize sediment loading to the wetland.
Tree Protection 1
Before beginning construction operations, establish a tree protection zone around trees to be
preserved by installing construction fences. Allow enough space from the trunk to protect the root
zone from soil compaction and mechanical damage, and the branches from mechanical damage (see
Table PV-1). If low branches will be kept, place the fence outside of the drip line. Where this is not
possible, place fencing as far away from the trunk as possible. In order to maintain a healthy tree, be
aware that about 60 percent of the tree's root zone extends beyond the drip line.
Table PV-1
Guidelines for Determining the Tree Protection Zone
(Source: Matheny and Clark, 1998; as cited in GreenCO and WWE 2008)
Distance from Trunk (ft) per inch of DBH
Species Tolerance to Damage Young Mature Over mature
Good 0.5' 0.75' 1.0'
Moderate 0.75' 1.0' 1.25'
Poor 1.0' 1.25' 1.5'
Notes: DBH = diameter at breast height (4.5 ft above grade); Young = <20% of
life expectancy; Mature = 20%-80% of life expectancy; Over mature =>80% of
life expectancy
Most tree roots grow within the top 12 to 18 inches of soil. Grade changes within the tree protection
zone should be avoided where possible because seemingly minor grade changes can either smother
1 Tree Protection guidelines adapted from GreenCO and WWE (2008). Green Industry Best Management Practices (BMPs) for
the Conservation and Protection of Water Resources in Colorado: Moving Toward Sustainability, Third Release. See
www.greenco.org for more detailed guidance on tree preservation.
Protection of Existing Vegetation (PV) SM-2
November 2010 Urban Drainage and Flood Control District PV-3
Urban Storm Drainage Criteria Manual Volume 3
roots (in fill situations) or damage roots (in cut situations). Consider small walls where needed to
avoid grade changes in the tree protection zone.
Place and maintain a layer of mulch 4 to 6-inch thick from the tree trunk to the fencing, keeping a
6-inch space between the mulch and the trunk. Mulch helps to preserve moisture and decrease soil
compaction if construction traffic is unavoidable. When planting operations are completed, the mulch
may be reused throughout planting areas.
Limit access, if needed at all, and appoint one route as the main entrance and exit to the tree
protection zone. Within the tree protection zone, do not allow any equipment to be stored, chemicals
to be dumped, or construction activities to take place except fine grading, irrigation system
installation, and planting operations. These activities should be conducted in consultation with a
landscaping professional, following Green Industry BMPs.
Be aware that soil compaction can cause extreme damage to tree health that may appear gradually
over a period of years. Soil compaction is easier to prevent than repair.
Maintenance and Removal
Repair or replace damaged or displaced fencing or other protective barriers around the vegetated area.
If damage occurs to a tree, consult an arborist for guidance on how to care for the tree. If a tree in a
designated preservation area is damaged beyond repair, remove and replace with a 2-inch diameter tree of
the same or similar species.
Construction equipment must not enter a wetland area, except as permitted by the U.S. Army Corps of
Engineers (USACE). Inadvertent placement of fill in a wetland is a 404 permit violation and will require
notification of the USACE.
If damage to vegetation occurs in a protected area, reseed the area with the same or similar species,
following the recommendations in the USDCM Revegetation chapter.
Construction Fence (CF) SM-3
November 2010 Urban Drainage and Flood Control District CF-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph CF-1. A construction fence helps delineate areas where
existing vegetation is being protected. Photo courtesy of Douglas
County.
Description
A construction fence restricts site access
to designated entrances and exits,
delineates construction site boundaries,
and keeps construction out of sensitive
areas such as natural areas to be
preserved as open space, wetlands and
riparian areas.
Appropriate Uses
A construction fence can be used to
delineate the site perimeter and locations
within the site where access is restricted
to protect natural resources such as
wetlands, waterbodies, trees, and other
natural areas of the site that should not be
disturbed.
If natural resource protection is an objective, then the construction fencing should be used in combination
with other perimeter control BMPs such as silt fence, sediment control logs or similar measures.
Design and Installation
Construction fencing may be chain link or plastic mesh and should be installed following manufacturer’s
recommendations. See Detail CF-1 for typical installations.
Do not place construction fencing in areas within work limits of machinery.
Maintenance and Removal
Inspect fences for damage; repair or replace as necessary.
Fencing should be tight and any areas with slumping or fallen posts should be reinstalled.
Fencing should be removed once construction is complete.
Construction Fence
Functions
Erosion Control No
Sediment Control No
Site/Material Management Yes
SM-3 Construction Fence (CF)
CF-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Construction Fence (CF) SM-3
November 2010 Urban Drainage and Flood Control District CF-3
Urban Storm Drainage Criteria Manual Volume 3
Vehicle Tracking Control (VTC) SM-4
November 2010 Urban Drainage and Flood Control District VTC-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph VTC-1. A vehicle tracking control pad constructed with
properly sized rock reduces off-site sediment tracking.
Description
Vehicle tracking controls provide
stabilized construction site access where
vehicles exit the site onto paved public
roads. An effective vehicle tracking
control helps remove sediment (mud or
dirt) from vehicles, reducing tracking onto
the paved surface.
Appropriate Uses
Implement a stabilized construction
entrance or vehicle tracking control where
frequent heavy vehicle traffic exits the
construction site onto a paved roadway. An
effective vehicle tracking control is
particularly important during the following conditions:
Wet weather periods when mud is easily tracked off site.
During dry weather periods where dust is a concern.
When poorly drained, clayey soils are present on site.
Although wheel washes are not required in designs of vehicle tracking controls, they may be needed at
particularly muddy sites.
Design and Installation
Construct the vehicle tracking control on a level surface. Where feasible, grade the tracking control
towards the construction site to reduce off-site runoff. Place signage, as needed, to direct construction
vehicles to the designated exit through the vehicle tracking control. There are several different types of
stabilized construction entrances including:
VTC-1. Aggregate Vehicle Tracking Control. This is a coarse-aggregate surfaced pad underlain by a
geotextile. This is the most common vehicle tracking control, and when properly maintained can be
effective at removing sediment from vehicle tires.
VTC-2. Vehicle Tracking Control with Construction Mat or Turf Reinforcement Mat. This type of
control may be appropriate for site access at very small construction sites with low traffic volume over
vegetated areas. Although this application does not typically remove sediment from vehicles, it helps
protect existing vegetation and provides a stabilized entrance.
Vehicle Tracking Control
Functions
Erosion Control Moderate
Sediment Control Yes
Site/Material Management Yes
SM-4 Vehicle Tracking Control (VTC)
VTC-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Photograph VTC-2. A vehicle tracking control pad with wheel wash
facility. Photo courtesy of Tom Gore.
VTC-3. Stabilized Construction Entrance/Exit with Wheel Wash. This is an aggregate pad, similar
to VTC-1, but includes equipment for tire washing. The wheel wash equipment may be as simple as
hand-held power washing equipment to more advance proprietary systems. When a wheel wash is
provided, it is important to direct wash water to a sediment trap prior to discharge from the site.
Vehicle tracking controls are sometimes installed in combination with a sediment trap to treat runoff.
Maintenance and Removal
Inspect the area for degradation and
replace aggregate or material used for a
stabilized entrance/exit as needed. If the
area becomes clogged and ponds water,
remove and dispose of excess sediment
or replace material with a fresh layer of
aggregate as necessary.
With aggregate vehicle tracking controls,
ensure rock and debris from this area do
not enter the public right-of-way.
Remove sediment that is tracked onto the
public right of way daily or more
frequently as needed. Excess sediment
in the roadway indicates that the
stabilized construction entrance needs
maintenance.
Ensure that drainage ditches at the
entrance/exit area remain clear.
A stabilized entrance should be removed only when there is no longer the potential for vehicle tracking to
occur. This is typically after the site has been stabilized.
When wheel wash equipment is used, be sure that the wash water is discharged to a sediment trap prior to
discharge. Also inspect channels conveying the water from the wash area to the sediment trap and
stabilize areas that may be eroding.
When a construction entrance/exit is removed, excess sediment from the aggregate should be removed
and disposed of appropriately. The entrance should be promptly stabilized with a permanent surface
following removal, typically by paving.
Vehicle Tracking Control (VTC) SM-4
November 2010 Urban Drainage and Flood Control District VTC-3
Urban Storm Drainage Criteria Manual Volume 3
SM-4 Vehicle Tracking Control (VTC)
VTC-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Vehicle Tracking Control (VTC) SM-4
November 2010 Urban Drainage and Flood Control District VTC-5
Urban Storm Drainage Criteria Manual Volume 3
SM-4 Vehicle Tracking Control (VTC)
VTC-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Stabilized Construction Roadway (SCR) SM-5
November 2010 Urban Drainage and Flood Control District SCR-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph SCR-1. Stabilized construction roadway.
Description
A stabilized construction roadway is a
temporary method to control sediment
runoff, vehicle tracking, and dust from
roads during construction activities.
Appropriate Uses
Use on high traffic construction roads to
minimize dust and erosion.
Stabilized construction roadways are
used instead of rough-cut street controls
on roadways with frequent construction
traffic.
Design and Installation
Stabilized construction roadways typically involve two key components: 1) stabilizing the road surface
with an aggregate base course of 3-inch-diameter granular material and 2) stabilizing roadside ditches, if
applicable. Early application of road base is generally suitable where a layer of coarse aggregate is
specified for final road construction.
Maintenance and Removal
Apply additional gravel as necessary to ensure roadway integrity.
Inspect drainage ditches along the roadway for erosion and stabilize, as needed, through the use of check
dams or rolled erosion control products.
Gravel may be removed once the road is ready to be paved. Prior to paving, the road should be inspected
for grade changes and damage. Regrade and repair as necessary.
Stabilized Construction Roadway
Functions
Erosion Control Yes
Sediment Control Moderate
Site/Material Management Yes
Stabilized Staging Area (SSA) SM-6
November 2010 Urban Drainage and Flood Control District SSA-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph SSA-1. Example of a staging area with a gravel surface to
prevent mud tracking and reduce runoff. Photo courtesy of Douglas
County.
Description
A stabilized staging area is a clearly
designated area where construction
equipment and vehicles, stockpiles, waste
bins, and other construction-related
materials are stored. The contractor
office trailer may also be located in this
area. Depending on the size of the
construction site, more than one staging
area may be necessary.
Appropriate Uses
Most construction sites will require a
staging area, which should be clearly
designated in SWMP drawings. The layout
of the staging area may vary depending on
the type of construction activity. Staging areas located in roadways due to space constraints require
special measures to avoid materials being washed into storm inlets.
Design and Installation
Stabilized staging areas should be completed prior to other construction activities beginning on the site.
Major components of a stabilized staging area include:
Appropriate space to contain storage and provide for loading/unloading operations, as well as parking
if necessary.
A stabilized surface, either paved or covered, with 3-inch diameter aggregate or larger.
Perimeter controls such as silt fence, sediment control logs, or other measures.
Construction fencing to prevent unauthorized access to construction materials.
Provisions for Good Housekeeping practices related to materials storage and disposal, as described in
the Good Housekeeping BMP Fact Sheet.
A stabilized construction entrance/exit, as described in the Vehicle Tracking Control BMP Fact Sheet,
to accommodate traffic associated with material delivery and waste disposal vehicles.
Over -sizing the stabilized staging area may result in disturbance of existing vegetation in excess of that
required for the project. This increases costs, as well as
requirements for long-term stabilization following the
construction period. When designing the stabilized staging area,
minimize the area of disturbance to the extent practical.
Stabilized Staging Area
Functions
Erosion Control Yes
Sediment Control Moderate
Site/Material
Yes
SM-6 Stabilized Staging Area (SSA)
SSA-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
See Detail SSA-1 for a typical stabilized staging area and SSA-2 for a stabilized staging area when
materials staging in roadways is required.
Maintenance and Removal
Maintenance of stabilized staging areas includes maintaining a stable surface cover of gravel, repairing
perimeter controls, and following good housekeeping practices.
When construction is complete, debris, unused stockpiles and materials should be recycled or properly
disposed. In some cases, this will require disposal of contaminated soil from equipment leaks in an
appropriate landfill. Staging areas should then be permanently stabilized with vegetation or other surface
cover planned for the development.
Minimizing Long-Term Stabilization Requirements
Utilize off-site parking and restrict vehicle access to the site.
Use construction mats in lieu of rock when staging is provided in an area that will not be disturbed
otherwise.
Consider use of a bermed contained area for materials and equipment that do not require a
stabilized surface.
Consider phasing of staging areas to avoid disturbance in an area that will not be otherwise
disturbed.
Stabilized Staging Area (SSA) SM-6
November 2010 Urban Drainage and Flood Control District SSA-3
Urban Storm Drainage Criteria Manual Volume 3
SM-6 Stabilized Staging Area (SSA)
SSA-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Street Sweeping and Vacuuming (SS) SM-7
November 2010 Urban Drainage and Flood Control District SS-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph SS-1. A street sweeper removes sediment and potential
pollutants along the curb line at a construction site. Photo courtesy of
Tom Gore.
Description
Street sweeping and vacuuming remove
sediment that has been tracked onto
roadways to reduce sediment transport
into storm drain systems or a surface
waterway.
Appropriate Uses
Use this practice at construction sites
where vehicles may track sediment
offsite onto paved roadways.
Design and Installation
Street sweeping or vacuuming should be
conducted when there is noticeable
sediment accumulation on roadways adjacent to the construction site. Typically, this will be concentrated
at the entrance/exit to the construction site. Well-maintained stabilized construction entrances, vehicle
tracking controls and tire wash facilities can help reduce the necessary frequency of street sweeping and
vacuuming.
On smaller construction sites, street sweeping can be conducted manually using a shovel and broom.
Never wash accumulated sediment on roadways into storm drains.
Maintenance and Removal
Inspect paved roads around the perimeter of the construction site on a daily basis and more
frequently, as needed. Remove accumulated sediment, as needed.
Following street sweeping, check inlet protection that may have been displaced during street
sweeping.
Inspect area to be swept for materials that may be hazardous prior to beginning sweeping operations.
Street Sweeping/ Vacuuming
Functions
Erosion Control No
Sediment Control Yes
Site/Material Management Yes
Temporary Diversion Channel (TDC) SM-8
August 2011 Urban Drainage and Flood Control District TDC-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph TDC-1. Use of a temporary diversion channel (right side)
to enable installation of a grade control structure (left side). Photo
courtesy of WWE.
Description
A temporary diversion channel diverts
water from a stream to allow for
construction activities to take place
underneath or in the stream. Diversion
channels are often required during the
construction of detention ponds, dams,
in-stream grade control structures,
utility installation and other activities
that require working in waterways.
Appropriate Uses
Temporary diversion channels vary
with the size of the waterway that is
being diverted. For large streams, a
temporary diversion may consist of
berms or coffer dams constructed in the
stream to confine flow to one side of the stream while work progresses on the dry side of the berm. For
smaller streams and often for construction of dams and detention basins, a temporary diversion channel
may divert the entire waterway, as illustrated in Figure TDC-1. For very short duration projects (typically
less than 4 weeks) during dry periods with low base flows, a pump and bypass pipe may serve as a
temporary diversion. Whenever a temporary diversion is used, construction should be scheduled during
drier times of the year if possible (October 1 through April 1), and construction in the waterway should
progress as quickly as possible to reduce the risk of exceeding the temporary diversion channel capacity.
Some construction activities within a waterway are very short lived, namely a few hours or days in
duration, and are minor in nature. These are typically associated with maintenance of utilities and stream
crossings and minor repairs to outfalls and eroded banks. In these cases, construction of temporary
diversion channels can often cause more soil disturbance and sediment movement than the maintenance
activity itself. If it can be reasonably determined based on area and duration of disturbance that channel
work will result in less disturbance and movement of sediment than would be done through installation of
a temporary diversion channel, it is reasonable to exempt these activities from the requirement to
construct a temporary diversion.
Design and Installation
Temporary Diversion Channel sizing procedures typically include the following steps:
Using the tributary area, A (in acres), determine the design peak flow rate according to Figure TDC-2.
Note: For long duration projects, or where the consequences of diversion failure warrant, a larger
design flow may be necessary.
Determine depth of flow, 1-foot maximum for flows
less than 20 cfs and 3 feet maximum for flows less
than 100 cfs. (Flows in excess of 100 cfs should be
designed in accordance with the Major Drainage
chapter in Volume 1).
Temporary Diversion Channel
Functions
Erosion Control Yes
Sediment Control No
Site/Material Management No
SM-8 Temporary Diversion Channel (TDC)
TDC-2 Urban Drainage and Flood Control District August 2011
Urban Storm Drainage Criteria Manual Volume 3
Determine channel slope based on existing and proposed site conditions.
Perform initial channel sizing calculations using Manning's Equation. Determine maximum
permissible velocities based on lining material.
Determine the channel geometry and check the capacity using Manning's Equation and the "n" value
given in Table TDC-1. The steepest side slope allowable for a temporary channel is two horizontal to
one vertical (2:1), unless vertical walls are installed using sheet piling, concrete or stacked stone.
Temporary diversion channels should have a minimum freeboard of 0.5 feet above the design water
surface elevation.
Figure TDC-2 may be used to estimate the design discharge for the sizing of temporary diversion
channels and pipes. The curves in this figure were developed using annual peak flow data collected from
17 watersheds within the UDFCD boundary. These data were collected over extended periods of time (up
to eleven years) and, as a result, provide a sound statistical basis for the figure. The data supporting
Figure TDC-2 were taken during the high flood potential period of April through September. The values
from Figure TDC-2 represent approximately the 95th percentile event that can occur, on the average, any
given year, which means that it is likely that about 95 percent of runoff peaks during an average year will
be less than values from this chart. This may not be the case in wetter-than-average seasons. Figure
TDC-2 provides estimated 2-year peak flow rates based on watershed imperviousness for small
waterways (< 12 square miles). Because Figure TDC-2 was developed using data from small watersheds,
it is not appropriate to extrapolate from this figure for larger, more complex watersheds. For larger
waterways (e.g., South Platte River, Sand Creek, Bear Creek, etc.), including ones controlled by flood
control reservoirs (e.g. Chatfield Dam, Cherry Creek Dam, etc.), site specific risk assessment may be
necessary to evaluate the appropriate level of protection to be provided by the temporary diversion. It is
also important to recognize that larger floods can and do occur. It is the responsibility of the designer and
the contractor to assess their risk of having the temporary diversion being exceeded and to evaluate the
damages such an event may cause to the project, adjacent properties and others. Consider larger capacity
diversions to protect a project if it will require a temporary diversion for more than one year.
Because temporary diversion channels typically are not in service long enough to establish adequate
vegetative lining, they must be designed to be stable for the design flow with the channel shear stress less
than the critical tractive shear stress for the channel lining material. This stability criterion applies not
only to diversion channels, but also to the stream-side of berms when berms are used to isolate a work
area within a stream. Unlined channels should not be used. Table TDC-1 gives Manning's "n" values for
lining materials. Design procedures for temporary channels are described in detail in the Hydraulic
Engineering Circular No. 15 published by the Federal Highway Administration. The methods presented
in this Fact Sheet are greatly simplified and are based on information developed using the most
commonly used erosion control materials.
Temporary Diversion Channel (TDC) SM-8
August 2011 Urban Drainage and Flood Control District TDC-3
Urban Storm Drainage Criteria Manual Volume 3
Figure TDC-1. Typical Temporary Diversion Channel
Former Location of
Stream Bank
Former Location of
Stream Bank
SM-8 Temporary Diversion Channel (TDC)
TDC-4 Urban Drainage and Flood Control District August 2011
Urban Storm Drainage Criteria Manual Volume 3
52.4%
40.2%
46.5%43.3%
33.3%
15.5%
18.0%
55.4%
24.3%
46.1%
39.1%
10.1%
60.9%
26.8%
29.8%
0
100
200
300
400
500
600
700
800
900
1000
0 2 4 6 8 10 12
TRIBUTARY AREA (SQUARE MILES)
F
L
O
W
(
C
F
S
)
Imp. = 40%
Imp. = 30%
Imp. = 20%
Imp. = 60%
Figure TDC-2. Temporary Diversion Facility Sizing Nomograph Based on 2-year Peak Flows -
Denver Metropolitan and Adjacent Areas
Temporary Diversion Channel (TDC) SM-8
August 2011 Urban Drainage and Flood Control District TDC-5
Urban Storm Drainage Criteria Manual Volume 3
Table TDC-1. Temporary Diversion Channel Design Criteria
Lining Material
Manning's n for
Flow Depth
0 ft to 1.0 ft
Manning's n for
Flow Depth
1.0 ft to 3.0 ft
Manning's n for
Flow Depth
3.0 ft to 5.0 ft
Plastic Membrane 0.011 0.010 0.009
Straw or Curled Wood
Mats
0.035 0.025 0.020
Riprap, Type VL 0.070 0.045 0.035
Riprap, Type L 0.100 0.070 0.040
Riprap, Type M 0.125 0.075 0.045
Notes: Use manufacturer's Manning's n when available.
See the Major Drainage chapter of Volume 1 for riprap gradation.
Erosion protection should extend a minimum of 0.5 feet above the design water depth.
Maintenance and Removal
Because temporary diversion channels are one of the most critical BMPs for work in waterways, they
must be inspected and maintained frequently to remain in effective operating condition. Flow barriers
should be inspected at the start and end of each workday and at any time that excess water is noted in dry
work areas. The diversion channel itself should be inspected for signs of erosion, and the lining should be
repaired or replaced if there are signs of failure. Check armoring at the diversion return point to the
waterway, and add additional armoring if erosion is noted.
Water should not be allowed to flow back through the natural stream until all construction is completed.
After redirecting the flow through the natural channel, lining materials should be removed from the
temporary diversion channel. The diversion channel should then be backfilled and stabilized. Points of
tie-in to the natural channel should be protected with riprap sized in accordance with the Major Drainage
chapter in Volume 1.
SM-8 Temporary Diversion Channel (TDC)
TDC-6 Urban Drainage and Flood Control District August 2011
Urban Storm Drainage Criteria Manual Volume 3
Temporary Diversion Channel (TDC) SM-8
August 2011 Urban Drainage and Flood Control District TDC-7
Urban Storm Drainage Criteria Manual Volume 3
Dewatering Operations (DW) SM-9
November 2010 Urban Drainage and Flood Control District DW-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph DW-1. A relatively small dewatering operation using straw
bales and a dewatering bag.
Photograph DW-2. Dewatering bags used for a relatively large
dewatering operation.
Description
The BMPs selected for construction
dewatering vary depending on site-
specific features such as soils,
topography, anticipated discharge
quantities, and discharge location.
Dewatering typically involves pumping
water from an inundated area to a BMP,
and then downstream to a receiving
waterway, sediment basin, or well-
vegetated area. Dewatering typically
involves use of several BMPs in
sequence.
Appropriate Uses
Dewatering operations are used when an
area of the construction site needs to be
dewatered as the result of a large storm
event, groundwater, or existing ponding
conditions. This can occur during deep
excavation, utility trenching, and wetland
or pond excavation.
Design and Installation
Dewatering techniques will vary
depending on site conditions. However,
all dewatering discharges must be treated
to remove sediment before discharging
from the construction site. Discharging
water into a sediment trap or basin is an
acceptable treatment option. Water may
also be treated using a dewatering filter bag,
and a series of straw bales or sediment logs. If these previous options are not feasible due to space or the
ability to passively treat the discharge to remove sediment, then a settling tank or an active treatment
system may need to be utilized. Settling tanks are manufactured tanks with a series of baffles to promote
settling. Flocculants can also be added to the tank to induce more rapid settling. This is an approach
sometimes used on highly urbanized construction sites. Contact the state agency for special requirements
prior to using flocculents and land application techniques.
Some commonly used methods to handle the pumped
water without surface discharge include land application
to vegetated areas through a perforated discharge hose
(i.e., the "sprinkler method") or dispersal from a water
truck for dust control.
Dewatering Operations
Functions
Erosion Control Moderate
Sediment Control Yes
Site/Material Management Yes
SM-9 Dewatering Operations (DW)
DW-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Dewatering discharges to non-paved areas must minimize the potential for scour at the discharge point
either using a velocity dissipation device or dewatering filter bag.
Design Details are provided for these types of dewatering situations:
DW-1. Dewatering for Pond Already Filled with Water
DW-2 Dewatering Sump for Submersed Pump
DW-3 Sump Discharge Settling Basin
DW-4 Dewatering Filter Bag
Maintenance and Removal
When a sediment basin or trap is used to enable settling of sediment from construction dewatering
discharges, inspect the basin for sediment accumulation. Remove sediment prior to the basin or trap
reaching half full. Inspect treatment facilities prior to any dewatering activity. If using a sediment
control practice such as a sediment trap or basin, complete all maintenance requirements as described in
the fact sheets prior to dewatering.
Properly dispose of used dewatering bags, as well as sediment removed from the dewatering BMPs.
Depending on the size of the dewatering operation, it may also be necessary to revegetate or otherwise
stabilize the area where the dewatering operation was occurring.
Dewatering Operations (DW) SM-9
November 2010 Urban Drainage and Flood Control District DW-3
Urban Storm Drainage Criteria Manual Volume 3
SM-9 Dewatering Operations (DW)
DW-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Dewatering Operations (DW) SM-9
November 2010 Urban Drainage and Flood Control District DW-5
Urban Storm Drainage Criteria Manual Volume 3
Temporary Stream Crossing (TSC) SM-10
November 2010 Urban Drainage and Flood Control District TSC-1
Urban Storm Drainage Criteria Manual Volume 3
Description
Where an actively flowing watercourse
must be crossed regularly by
construction vehicles, a temporary
crossing should be provided. Three
primary methods are available:
Culvert crossing
Stream ford
Temporary bridge
Culvert crossings and fords are the most
commonly used methods. Due to the
expense associated with a temporary
bridge, these are used primarily on long-
term projects.
Appropriate Uses
Construction vehicles shall be kept out of waterways to the maximum extent practicable. Use a
temporary stream crossing when it is absolutely necessary to cross a stream on a construction site.
Construct a temporary crossing even if the stream or drainageway is typically dry. Multiple stream
crossings should be avoided to minimize environmental impacts.
A permit is required for placement of fill in a waterway under Section 404 of the Clean Water Act. The
local office of the U.S. Army Corps of Engineers (USACE) should be contacted concerning the
requirements for obtaining a 404 permit. In addition, a permit from the U.S. Fish and Wildlife Service
(USFWS) may be needed if endangered species are of concern in the work area. Typically, the USFWS
issues are addressed by a 404 permit, if one is required. The municipality of jurisdiction should also be
consulted, and can provide assistance. Other permits to be obtained may include a floodplain
development permit from the local jurisdiction.
Design and Installation
Design details are provided for these types of stream crossings:
TSC-1. Culvert Crossing
TSC-2. Ford Crossing
TSC-3. Flume Crossing
Temporary Stream Crossing
Functions
Erosion Control Yes
Sediment Control Yes
Site/Material Management No
Photograph TSC-1. A temporary stream crossing using culverts.
Photo courtesy of Tom Gore.
SM-10 Temporary Stream Crossing (TSC)
TSC-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
A culvert crossing should be designed to pass at least the 2-year design flow. Use Figure DC-2 from the
Temporary Channel Diversion Fact Sheet to determine the 2-year peak flow rate. Culvert sizing must
account for the headwater and tailwater controls to properly size the culvert. For additional discussion on
design of box culverts and pipes, see the Major Drainage chapter in Volume 1. The designer also needs
to confirm that the riprap selected is appropriate for the conditions in the channel being crossed.
When a ford must be used, namely when a culvert is not practical or the best solution, the ford should be
lined with at least a 12-inch thick layer of Type VL (D50 = 6 inches) or Type L (D50 = 9 inches) riprap
with void spaces filed with 1-1/2 inch diameter rock. Ford crossings are recommended primarily for
crossings of ephemeral (i.e. intermittently, briefly flowing) streams.
For a temporary bridge crossing, consult with a structural and/or geotechnical engineer for temporary
bridge design or consider pre-fabricated alternatives.
Maintenance and Removal
Inspect stream for bank erosion and in-stream degradation. If bank erosion is occurring, stabilize banks
using erosion control practices such as erosion control blankets. If in-stream degradation is occurring,
armor the culvert outlet(s) with riprap to dissipate energy (see Outlet Protection Fact Sheet). If sediment
is accumulating upstream of the crossing, remove excess sediment as needed to maintain the functionality
of the crossing.
Remove the temporary crossing when it is no longer needed for construction. Take care to minimize the
amount of sediment lost into the stream upon removal. Once the crossing has been removed, stabilize the
stream banks with seed and erosion control blankets.
Temporary Stream Crossing (TSC) SM-10
November 2010 Urban Drainage and Flood Control District TSC-3
Urban Storm Drainage Criteria Manual Volume 3
SM-10 Temporary Stream Crossing (TSC)
TSC-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Temporary Stream Crossing (TSC) SM-10
November 2010 Urban Drainage and Flood Control District TSC-5
Urban Storm Drainage Criteria Manual Volume 3
SM-10 Temporary Stream Crossing (TSC)
TSC-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Temporary Batch Plant (TBP) SM-11
November 2010 Urban Drainage and Flood Control District TBP-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph TBP-1. Effective stormwater management at temporary
batch plants requires implementation of multiple BMPs. Photo
courtesy of California Stormwater BMP Handbook.
Description
Temporary batch plant management
includes implementing multiple BMPs
such as perimeter controls, concrete
washout area, stabilized construction
access, good housekeeping, and other
practices designed to reduce polluted
runoff from the batch plant area.
Appropriate Uses
Implement this BMP at temporary batch
plants and identify the location of the
batch plant in the SWMP.
Additional permitting may be required for
the operation of batch plants depending on their duration and location.
Design and Installation
The following lists temporary management strategies to mitigate runoff from batch plant operations:
When stockpiling materials, follow the Stockpile Management BMP.
Locate batch plants away from storm drains and natural surface waters.
A perimeter control should be installed around the temporary batch plant.
Install run-on controls where feasible.
A designated concrete washout should be located within the perimeter of the site following the
procedures in the Concrete Washout Area BMP.
Follow the Good Housekeeping BMP, including proper spill containment measures, materials
storage, and waste storage practices.
A stabilized construction entrance or vehicle tracking control pad should be installed at the plant
entrance, in accordance with the Vehicle Tracking Control BMP.
Maintenance and Removal
Inspect the batch plant for proper functioning of the BMPs, with
attention to material and waste storage areas, integrity of
perimeter BMPs, and an effective stabilized construction
entrance.
Temporary Batch Plants
Functions
Erosion Control No
Sediment Control No
Site/Material Management Yes
SM-11 Temporary Batch Plant (TBP)
TBP-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
After the temporary batch plant is no longer needed, remove stockpiled materials and equipment, regrade
the site as needed, and revegetate or otherwise stabilize the area.
Paving and Grinding Operations (PGO) SM-12
November 2010 Urban Drainage and Flood Control District PGO-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph PGO-1. Paving operations on a Colorado highway. Photo
courtesy of CDOT.
Description
Manage runoff from paving and grinding
operations to reduce pollutants entering
storm drainage systems and natural
drainageways.
Appropriate Uses
Use runoff management practices during
all paving and grinding operations such
as surfacing, resurfacing, and saw
cutting.
Design and Installation
There are a variety of management
strategies that can be used to manage runoff from paving and grinding operations:
Establish inlet protection for all inlets that could potentially receive runoff.
Schedule paving operations when dry weather is forecasted.
Keep spill kits onsite for equipment spills and keep drip pans onsite for stored equipment.
Install perimeter controls when asphalt material is used on embankments or shoulders near
waterways, drainages, or inlets.
Do not wash any paved surface into receiving storm drain inlets or natural drainageways. Instead,
loose material should be swept or vacuumed following paving and grinding operations.
Store materials away from drainages or waterways.
Recycle asphalt and pavement material when feasible. Material that cannot be recycled must be
disposed of in accordance with applicable regulations.
See BMP Fact Sheets for Inlet Protection, Silt Fence and other perimeter controls selected for use during
paving and grinding operations.
Maintenance and Removal
Perform maintenance and removal of inlet protection and perimeter controls in accordance with their
respective fact sheets.
Promptly respond to spills in accordance with the spill
prevention and control plan.
Paving and Grinding Operations
Functions
Erosion Control No
Sediment Control No
Site/Material Management Yes
Grass Buffer T-1
November 2010 Urban Drainage and Flood Control District GB-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph GB-1. A flush curb allows roadway runoff to sheet flow
through the grass buffer. Flows are then further treated by the grass
swale. Photo courtesy of Muller Engineering.
Description
Grass buffers are densely vegetated
strips of grass designed to accept sheet
flow from upgradient development.
Properly designed grass buffers play a
key role in LID, enabling infiltration and
slowing runoff. Grass buffers provide
filtration (straining) of sediment.
Buffers differ from swales in that they
are designed to accommodate overland
sheet flow rather than concentrated or
channelized flow.
Site Selection
Grass buffers can be incorporated into a
wide range of development settings.
Runoff can be directly accepted from a
parking lot, roadway, or the roof of a
structure, provided the flow is distributed in a uniform manner over the width of the buffer. This can be
achieved through the use of flush curbs, slotted curbs, or level spreaders where needed. Grass buffers are
often used in conjunction with grass swales. They are well suited for use in riparian zones to assist in
stabilizing channel banks adjacent to major drainageways and receiving waters. These areas can also
sometimes serve multiple functions such as recreation.
Hydrologic Soil Groups A and B provide the best infiltration
capacity for grass buffers. For Type C and D soils, buffers still
serve to provide filtration (straining) although infiltration rates are
lower.
Designing for Maintenance
Recommended ongoing maintenance practices for all BMPs are
provided in Chapter 6 of this manual. During design the
following should be considered to ensure ease of maintenance
over the long-term:
Where appropriate (where vehicle safety would not be
impacted), install the top of the buffer 1 to 3 inches below the
adjacent pavement so that growth of vegetation and
accumulation of sediment at the edge of the strip does not
prevent runoff from entering the buffer. Alternatively, a
sloped edge can be used adjacent to vehicular traffic areas.
Amend soils to encourage deep roots and reduce irrigation
requirements, as well as promote infiltration.
Grass Buffer
Functions
LID/Volume Red. Yes
WQCV Capture No
WQCV+Flood Control No
Fact Sheet Includes
EURV Guidance No
Typical Effectiveness for Targeted
Pollutants3
Sediment/Solids Good
Nutrients Moderate
Total Metals Good
Bacteria Poor
Other Considerations
Life-cycle Costs Low
3 Based primarily on data from the
International Stormwater BMP Database
(www.bmpdatabase.org).
T-1 Grass Buffer
GB-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Benefits
Filters (strains) sediment and
trash.
Reduces directly connected
impervious area. (See Chapter 3
for quantifying benefits.)
Can easily be incorporated into a
treatment train approach.
Provides green space available
for multiple uses including
recreation and snow storage.
Straightforward maintenance
requirements when the buffer is
protected from vehicular traffic.
Limitations
Frequently damaged by vehicles
when adjacent to roadways and
unprotected.
A thick vegetative cover is
needed for grass buffers to be
effective.
Nutrient removal in grass buffers
is typically low.
High loadings of coarse solids,
trash, and debris require
pretreatment.
Space for grass buffers may not
be available in ultra urban areas
(lot-line-to-lot-line).
Design and adjust the irrigation system (temporary or
permanent) to provide water in amounts appropriate for
the selected vegetation. Irrigation needs will change from
month to month and year to year.
Protect the grass buffer from vehicular traffic when using
this BMP adjacent to roadways. This can be done with a
slotted curb (or other type of barrier) or by constructing a
reinforced grass shoulder (see Fact Sheet T-10.5).
Design Procedure and Criteria
The following steps outline the grass buffer design procedure
and criteria. Figure GB-1 is a schematic of the facility and its
components:
1. Design Discharge: Use the hydrologic procedures
described in the Runoff chapter of Volume 1 to determine
the 2-year peak flow rate (Q2) of the area draining to the
grass buffer.
2. Minimum Width: The width (W), normal to flow of the
buffer, is typically the same as the contributing basin (see
Figure GB-1). An exception to this is where flows become
concentrated. Concentrated flows require a level spreader
to distribute flows evenly across the width of the buffer.
The minimum width should be: 𝑊𝑊=𝑄𝑄20.05 Equation GB-1
Where:
W = width of buffer (ft)
Q2 = 2-year peak runoff (cfs)
3. Length: The recommended length (L), the distance along
the sheet flow direction, should be a minimum of 14 feet.
This value is based on the findings of Barrett et al. 2004 in
Stormwater Pollutant Removal in Roadside Vegetated
Strips and is appropriate for buffers with greater than 80%
vegetative cover and slopes up to 10%. The study found
that pollutant removal continues throughout a length of 14 feet. Beyond this length, a point of
diminishing returns in pollutant reduction was found. It is important to note that shorter lengths or
slightly steeper slopes will also provide some level of removal where site constraints dictate the
geometry of the buffer.
Grass Buffer T-1
November 2010 Urban Drainage and Flood Control District GB-3
Urban Storm Drainage Criteria Manual Volume 3
Photograph GB-2. This level spreader carries concentrated flows into a
slotted pipe encased in concrete to distribute flows evenly to the grass buffer
shown left in the photo. Photo courtesy of Bill Wenk.
Use of Grass Buffers
Sheet flow of stormwater through a
grassed area provides some benefit in
pollutant removal and volume
reduction even when the geometry of
the BMP does not meet the criteria
provided in this Fact Sheet. These
criteria provide a design procedure
that should be used when possible;
however, when site constraints are
limiting, this treatment concept is
still encouraged.
4. Buffer Slope: The design slope of a grass buffer in the
direction of flow should not exceed 10%. Generally, a
minimum slope of 2% or more in turf is adequate to
facilitate positive drainage. For slopes less than 2%,
consider including an underdrain system to mitigate
nuisance drainage.
5. Flow Characteristics (sheet or concentrated):
Concentrated flows can occur when the width of the
watershed differs from that of the grass buffer.
Additionally, when the product of the watershed flow
length and the interface slope (the slope of the watershed
normal to flow at the grass buffer) exceeds approximately
one, flows may become concentrated. Use the following
equations to determine flow characteristics: Sheet Flow: FL(SI) ≤ 1 Equation GB-2 Concentrated Flow: FL(SI) > 1 Equation GB-3
Where:
FL = watershed flow length (ft)
SI = interface slope (normal to flow) (ft/ft)
6. Flow Distribution: Flows delivered to a grass buffer must be sheet flows. Slotted or flush curbing,
permeable pavements, or other devices can be used to spread flows. The grass buffer should have
relatively consistent slopes to avoid concentrating flows within the buffer.
A level spreader should be used when flows are concentrated. A level spreader can be a slotted drain
designed to discharge flow through the slot as shown in Photo GB-2. It could be an exfiltration
trench filled with gravel, which allows water to infiltrate prior to discharging over a level concrete or
rock curb. There are many ways to design and construct a level spreader. They can also be used in
series when the length of the
buffer allows flows to re-
concentrate. See Figure GB-2 for
various level spreader sections.
T-1 Grass Buffer
GB-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Photograph GB-3. This level spreader includes the added benefit of a
sedimentation basin prior to even distribution of concentrated flows
from the roadway into the grass buffer. Photo courtesy of Bill Wenk.
Photograph GB-4. Maintenance access is provided via the ramp
located at the end of the basin. Photo courtesy of Bill Wenk.
Photos GB-3 and GB-4 show a level
spreader that includes a basin for
sedimentation. Concentrated flows
enter the basin via stormsewer. The
basin is designed to drain slowly
while overflow is spread evenly to
the downstream vegetation. A small
notch, orifice, or pipe can be used to
drain the level spreader completely.
The opening should be small to
encourage frequent flows to overtop
the level spreader but not so small
that it is frequently clogged.
7. Soil Preparation: In order to
encourage establishment and long-
term health of the selected vegetation,
it is essential that soil conditions be
properly prepared prior to
installation. Following site grading,
poor soil conditions often exist.
When possible, remove, strip,
stockpile, and reuse on-site topsoil.
If the site does not contain topsoil,
the soils should be amended prior to
vegetation. Typically 3 to 5 cubic
yards of soil amendment (compost)
per 1,000 square feet, tilled 6 inches
into the soil is required in order for
vegetation to thrive, as well as to
enable infiltration of runoff.
Additionally, inexpensive soil tests
can be conducted to determine
required soil amendments. (Some
local governments may also require
proof of soil amendment in
landscaped areas for water
conservation reasons.)
8. Vegetation: This is the most critical
component for treatment within a grass buffer. Select durable, dense, and drought tolerant grasses to
vegetate the buffer. Also consider the size of the watershed as larger watersheds will experience
more frequent flows. The goal is to provide a dense mat of vegetative cover. Grass buffer
performance falls off rapidly as the vegetation coverage declines below 80% (Barrett et al.2004).
Grass Buffer T-1
November 2010 Urban Drainage and Flood Control District GB-5
Urban Storm Drainage Criteria Manual Volume 3
Turf grasses such as Kentucky bluegrass are often selected due to these qualities1
9. Irrigation: Grass buffers should be equipped with irrigation systems to promote establishment and
survival in Colorado's semi-arid environment. Systems may be temporary or permanent, depending
on the type of vegetation selected. Irrigation application rates and schedules should be developed and
adjusted throughout the establishment and growing season to meet the needs of the selected plant
species. Initially, native grasses require the same irrigation requirements as bluegrass. After the
grass is established, irrigation requirements for native grasses can be reduced. Irrigation practices
have a significant effect on the function of the grass buffer. Overwatering decreases the permeability
of the soil, reducing the infiltration capacity and contributing to nuisance baseflows. Conversely,
under watering may result in delays in establishment of the vegetation in the short term and unhealthy
vegetation that provides less filtering and increased susceptibility to erosion and rilling over the long
term.
. Dense native turf
grasses may also be selected where a more natural look is desirable. Once established, these provide
the benefit of lower irrigation requirements. See the Revegetation chapter in Volume 2 of this manual
with regard to seed mix selection, planting and ground preparation. Depending on soils and
anticipated flows, consider erosion control measures until vegetation has been established.
10. Outflow Collection: Provide a means for downstream conveyance. A grass swale can be used for
this purpose, providing additional LID benefits.
Construction Considerations
Success of grass buffers depends not only on a good design and long-term maintenance, but also on
installing the facility in a manner that enables the BMP to function as designed. Construction
considerations include:
The final grade of the buffer is critical. Oftentimes, following soil amendment and placement of sod,
the final grade is too high to accept sheet flow. The buffer should be inspected prior to placement of
seed or sod to ensure appropriate grading.
Perform soil amending, fine grading, and seeding only after tributary areas have been stabilized and
utility work crossing the buffer has been completed.
When using sod tiles stagger the ends of the tiles to prevent the formation of channels along the
joints. Use a roller on the sod to ensure there are no air pockets between the sod and soil.
Avoid over compaction of soils in the buffer area during construction to preserve infiltration
capacities.
Erosion and sediment control measures on upgradient disturbed areas must be maintained to prevent
excessive sediment loading to grass buffer.
1 Although Kentucky bluegrass has relatively high irrigation requirements to maintain a lush, green aesthetic, it also withstands
drought conditions by going dormant. Over-irrigation of Kentucky bluegrass is a common problem along the Colorado Front
Range, and it can be healthy, although less lush, with much less irrigation than is typically applied.
T-1 Grass Buffer
GB-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
PLAN
PROFILE
Figure GB-1. Typical Grass Buffer Graphic by Adia Davis.
Grass Buffer T-1
November 2010 Urban Drainage and Flood Control District GB-7
Urban Storm Drainage Criteria Manual Volume 3
Figure GB-2. Typical Level Spreader Details
Grass Swale T-2
November 2010 Urban Drainage and Flood Control District GS-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph GS-1. This grass swale provides treatment of roadway
runoff in a residential area. Photo courtesy of Bill Ruzzo.
Description
Grass swales are densely vegetated
trapezoidal or triangular channels with
low-pitched side slopes designed to
convey runoff slowly. Grass swales
have low longitudinal slopes and broad
cross-sections that convey flow in a slow
and shallow manner, thereby facilitating
sedimentation and filtering (straining)
while limiting erosion. Berms or check
dams may be incorporated into grass
swales to reduce velocities and
encourage settling and infiltration.
When using berms, an underdrain
system should be provided. Grass
swales are an integral part of the Low
Impact Development (LID) concept and
may be used as an alternative to a curb and
gutter system.
Site Selection
Grass swales are well suited for sites with low to moderate slopes.
Drop structures or other features designed to provide the same
function as a drop structures (e.g., a driveway with a stabilized
grade differential at the downstream end) can be integrated into
the design to enable use of this BMP at a broader range of site
conditions. Grass swales provide conveyance so they can also be
used to replace curb and gutter systems making them well suited
for roadway projects.
Designing for Maintenance
Recommended ongoing maintenance practices for all BMPs are
provided in Chapter 6 of this manual. During design, the
following should be considered to ensure ease of maintenance
over the long-term:
Consider the use and function of other site features so that the
swale fits into the landscape in a natural way. This can
encourage upkeep of the area, which is particularly important
in residential areas where a loss of aesthetics and/or function
can lead to homeowners filling in and/or piping reaches of
this BMP.
Grass Swale
Functions
LID/Volume Red. Yes
WQCV Capture No
WQCV+Flood Control No
Fact Sheet Includes
EURV Guidance No
Typical Effectiveness for Targeted
Pollutants3
Sediment/Solids Good
Nutrients Moderate
Total Metals Good
Bacteria Poor
Other Considerations
Life-cycle Costs Low
3 Based primarily on data from the
International Stormwater BMP Database
(www.bmpdatabase.org).
T-2 Grass Swale
GS-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Provide access to the swale for mowing equipment and
design sideslopes flat enough for the safe operation of
equipment.
Design and adjust the irrigation system (temporary or
permanent) to provide appropriate water for the selected
vegetation.
An underdrain system will reduce excessively wet areas,
which can cause rutting and damage to the vegetation
during mowing operations.
When using an underdrain, do not put a filter sock on the
pipe. This is unnecessary and can cause the slots or
perforations in the pipe to clog.
Design Procedure and Criteria
The following steps outline the design procedure and criteria
for stormwater treatment in a grass swale. Figure GS-1
shows trapezoidal and triangular swale configurations.
1. Design Discharge: Determine the 2-year flow rate to be
conveyed in the grass swale under fully developed
conditions. Use the hydrologic procedures described in
the Runoff Chapter in Volume 1.
2. Hydraulic Residence Time: Increased hydraulic
residence time in a grass swale improves water quality
treatment. Maximize the length of the swale when
possible. If the length of the swale is limited due to site
constraints, the slope can also be decreased or the cross-sectional area increased to increase hydraulic
residence time.
3. Longitudinal Slope: Establish a longitudinal slope that will meet Froude number, velocity, and
depth criteria while ensuring that the grass swale maintains positive drainage. Positive drainage can
be achieved with a minimum 2% longitudinal slope or by including an underdrain system (see step 8).
Use drop structures as needed to accommodate site constraints. Provide for energy dissipation
downstream of each drop when using drop structures.
4. Swale Geometry: Select geometry for the grass swale. The cross section should be either
trapezoidal or triangular with side slopes not exceeding 4:1 (horizontal: vertical), preferably flatter.
Increase the wetted area of the swale to reduce velocity. Lower velocities result in improved
pollutant removal efficiency and greater volume reduction. If one or both sides of the grass swale are
also to be used as a grass buffer, follow grass buffer criteria.
Benefits
Removal of sediment and
associated constituents through
filtering (straining)
Reduces length of storm sewer
systems in the upper portions of a
watershed
Provides a less expensive and
more attractive conveyance
element
Reduces directly connected
impervious area and can help
reduce runoff volumes.
Limitations
Requires more area than
traditional storm sewers.
Underdrains are recommended for
slopes under 2%.
Erosion problems may occur if not
designed and constructed
properly.
Grass Swale T-2
November 2010 Urban Drainage and Flood Control District GS-3
Urban Storm Drainage Criteria Manual Volume 3
Native grasses provide
a more natural aesthetic
and require less water
once established.
Use of Grass Swales
Vegetated conveyance elements provide some benefit in pollutant removal and volume reduction
even when the geometry of the BMP does not meet the criteria provided in this Fact Sheet. These
criteria provide a design procedure that should be used when possible; however, when site
constraints are limiting, vegetated conveyance elements designed for stability are still encouraged.
5. Vegetation: Select durable, dense, and drought tolerant grasses. Turf grasses, such as Kentucky
bluegrass, are often selected due to these qualities1
once established. Turf grass is a general term for any
grasses that will form a turf or mat as opposed to bunch
grass, which will grow in clumplike fashion. Grass
selection should consider both short-term (for
establishment) and long-term maintenance requirements,
given that some varieties have higher maintenance
requirements than others. Follow criteria in the
Revegetation Chapter of Volume 2, with regard to seed
mix selection, planting, and ground preparation.
. Native turf grasses may also be selected where a
more natural look is desirable. This will also provide the benefit of lower irrigation requirements,
6. Design Velocity: Maximum flow velocity in the swale
should not exceed one foot per second. Use the Soil
Conservation Service (now the NRCS) vegetal retardance
curves for the Manning coefficient (Chow 1959).
Determining the retardance coefficient is an iterative
process that the UD-BMP workbook automates. When
starting the swale vegetation from sod, curve "D" (low retardance) should be used. When starting
vegetation from seed, use the "E" curve (very low vegetal retardance).
7. Design Flow Depth: Maximum flow depth should not exceed one foot at the 2-year peak flow rate.
Check the conditions for the 100-year flow to ensure that drainage is being handled without flooding
critical areas, structures, or adjacent streets.
Table GS-1. Grass Swale Design Summary for Water Quality
1 Although Kentucky bluegrass has relatively high irrigation requirements to maintain a lush, green aesthetic, it also withstands
drought conditions by going dormant. Over-irrigation of Kentucky bluegrass is a common problem along the Colorado Front
Range. It can be healthy, although less lush, with much less irrigation than is typically applied.
Design Flow Maximum
Froude Number
Maximum
Velocity
Maximum
Flow Depth
2-year event 0.5 1 ft/s 1 ft
T-2 Grass Swale
GS-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
8. Underdrain: An underdrain is necessary for swales with longitudinal slopes less than 2.0%. The
underdrain can drain directly into an inlet box at the downstream end of the swale, daylight through
the face of a grade control structure or continue below grade through several grade control structures
as shown in Figure GS-1.
The underdrain system should be placed within an aggregate layer. If no underdrain is required, this
layer is not required. The aggregate layer should consist of an 8-inch thick layer of CDOT Class C
filter material meeting the gradation in Table GS-2. Use of CDOT Class C Filter material with a
slotted pipe that meets the slot dimensions provided in Table GS-3 will eliminate the need for
geotextile fabrics. Previous versions of this manual detailed an underdrain system that consisted of a
3- to 4-inch perforated HDPE pipe in a one-foot trench section of AASHTO #67 coarse aggregate
surrounded by geotextile fabric. If desired, this system continues to provide an acceptable alternative
for use in grass swales. Selection of the pipe size may be a function of capacity or of maintenance
equipment. Provide cleanouts at approximately 150 feet on center.
Table GS-2. Gradation Specifications for Class C Filter Material
(Source: CDOT Table 703-7)
Sieve Size Mass Percent Passing Square Mesh Sieves
19.0 mm (3/4") 100
4.75 mm (No. 4) 60 – 100
300 µm (No. 50) 10 – 30
150 µm (No. 100) 0 – 10
75 µm (No. 200) 0 - 3
Table GS-3. Dimensions for Slotted Pipe
Pipe Diameter Slot
Length1
Maximum Slot
Width
Slot
Centers1 Open Area1
(per foot)
4” 1-1/16” 0.032” 0.413” 1.90 in2
6” 1-3/8” 0.032” 0.516” 1.98 in2
1 Some variation in these values is acceptable and is expected from various pipe
manufacturers. Be aware that both increased slot length and decreased slot centers
will be beneficial to hydraulics but detrimental to the structure of the pipe.
Grass Swale T-2
November 2010 Urban Drainage and Flood Control District GS-5
Urban Storm Drainage Criteria Manual Volume 3
Photograph GS-2. This community used
signage to mitigate compaction of soils post-
construction. Photo courtesy of Nancy Styles.
9. Soil preparation: Poor soil conditions often exist following site grading. When the section includes
an underdrain, provide 4 inches of sandy loam at the invert of the swale extending up to the 2-year
water surface elevation. This will improve infiltration and reduce ponding. For all sections,
encourage establishment and long-term health of the bottom and side slope vegetation by properly
preparing the soil. If the existing site provides a good layer of topsoil, this should be striped,
stockpiled, and then replaced just prior to seeding or placing sod. If not available at the site, topsoil
can be imported or the existing soil may be amended. Inexpensive soil tests can be performed
following rough grading, to determine required soil amendments. Typically, 3 to 5 cubic yards of soil
amendment per 1,000 square feet, tilled 4 to 6 inches into the soil is required in order for vegetation to
thrive, as well as to enable infiltration of runoff.
10. Irrigation: Grass swales should be equipped with irrigation systems to promote establishment and
survival in Colorado's semi-arid environment. Systems may be temporary or permanent, depending
on the type of grass selected. Irrigation practices have a significant effect on the function of the grass
swale. Overwatering decreases the permeability of the soil, reducing the infiltration capacity of the
soil and contributing to nuisance baseflows. Conversely, under watering may result in delays in
establishment of the vegetation in the short term and unhealthy vegetation that provides less filtering
(straining) and increased susceptibility to erosion and riling over the long term.
Construction Considerations
Success of grass swales depends not only on a good
design and maintenance, but also on construction
practices that enable the BMP to function as designed.
Construction considerations include:
Perform fine grading, soil amendment, and seeding
only after upgradient surfaces have been stabilized
and utility work crossing the swale has been
completed.
Avoid compaction of soils to preserve infiltration
capacities.
Provide irrigation appropriate to the grass type.
Weed the area during the establishment of vegetation
by hand or mowing. Mechanical weed control is
preferred over chemical weed killer.
Protect the swale from other construction activities.
When using an underdrain, ensure no filter sock is placed on the pipe. This is unnecessary and can
cause the slots or perforations in the pipe to clog.
T-2 Grass Swale
GS-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Figure GS-1. Grass Swale Profile and Sections
Design Example
The UD-BMP workbook, designed as a tool for both designer and reviewing agency is available at
www.udfcd.org. This section provides a completed design form from this workbook as an example.
`
NORTHERNENGINEERING.COM | 970.221.4158 SWMP: MASON STREET INFRASTRUCTURE
FORT COLLINS | GREELEY APPENDIX
APPENDIX C
LANDSCAPE PLAN
DRAWING NUMBER:
ISSUED
PROJECT No.:
DRAWN BY:
REVIEWED BY:
SEAL:
PREPARED BY:
No.DESCRIPTION DATE
REVISIONS
No.DESCRIPTION DATE
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ORIGINAL SIZE 24X36
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419 Canyon Ave. Suite 200 Fort Collins, CO 80521
phone 970.224.5828 | fax 970.225.6657 | www.ripleydesigninc.com
RIPLEY DESIGN INC.
Klara Rossouw
419 Canyon Ave. Suite 200
Fort Collins, CO 80521
p. 970.224.5828
NORTH COLLEGE 1311, LLC
262 E. Mountain Ave.
Fort Collins, CO 80524
p. 970.490.2626
ENGINEER
LAND PLANNER
NORTHERN ENGINEERING
Blaine Mathisen
301 N Howes St, Suite 100
Fort Collins, CO 80521
p. 970.221.4158
OWNER
COVER SHEET
PDP/FDP SUBMITTAL
MASON STREET
INFRASTRUCTURE
5
4
PDP/FDP RD 5
PDP/FDP RD 4
03/12/2024
01/31/2024
12/20/2023PDP/FDP RD 33
10/4/2023PDP RD 22
5/24/2023PDP RD 11
FORT COLLINS, CO
KR
LO
R23-008
L0.01
VICINITY MAP
NORTH
GROSS
GROSS AREA 571,843 SF (13.13 AC)
ZONING C-S
GROSS
AREA (SF)%
TRACT A 10,683 1.9
LOT 1 339,334 59.3
LOT 2 120,748 21.1
LOT 3 57,558 10.1
PUBLIC STREET RIGHT-OF-WAY 43520 7.61
HARDSCAPE 4,942
DRIVES AND PARKING 25,588
LANDSCAPE 12,990
TOTAL GROSS COVERAGE 571,843SF
(13.13 AC)100.00
NET
NET AREA 530,365 SF (12.17 AC)
AREA COVERAGE
LAND USE CHART
MASON STREET INFRASTRUCTURE
PROJECT DEVELOPMENT PLAN
1.PLANT QUALITY: ALL PLANT MATERIAL SHALL BE A-GRADE OR NO. 1 GRADE - FREE OF ANY DEFECTS, OF NORMAL HEALTH,
HEIGHT, LEAF DENSITY AND SPREAD APPROPRIATE TO THE SPECIES AS DEFINED BY THE AMERICAN ASSOCIATION OF
NURSERYMEN (AAN) STANDARDS. ALL TREES SHALL BE BALL AND BURLAP OR EQUIVALENT.
2.IRRIGATION: ALL LANDSCAPE AREAS WITHIN THE SITE INCLUDING TURF, SHRUB BEDS AND TREE AREAS SHALL BE
IRRIGATED WITH AN AUTOMATIC IRRIGATION SYSTEM. THE IRRIGATION PLAN MUST BE REVIEWED AND APPROVED BY THE
CITY OF FORT COLLINS WATER UTILITIES DEPARTMENT PRIOR TO THE ISSUANCE OF A BUILDING PERMIT. ALL TURF
AREAS SHALL BE IRRIGATED WITH AN AUTOMATIC POP-UP IRRIGATION SYSTEM. ALL SHRUB BEDS AND TREES, INCLUDING
IN NATIVE SEED AREAS, SHALL BE IRRIGATED WITH AN AUTOMATIC DRIP (TRICKLE) IRRIGATION SYSTEM, OR WITH AN
ACCEPTABLE ALTERNATIVE APPROVED BY THE CITY WITH THE IRRIGATION PLANS. THE IRRIGATION SYSTEM SHALL BE
ADJUSTED TO MEET THE WATER REQUIREMENTS OF THE INDIVIDUAL PLANT MATERIAL.
3.TOPSOIL: TO THE MAXIMUM EXTENT FEASIBLE, TOPSOIL THAT IS REMOVED DURING CONSTRUCTION ACTIVITY SHALL BE
CONSERVED FOR LATER USE ON AREAS REQUIRING REVEGETATION AND LANDSCAPING.
4.SOIL AMENDMENTS: SOIL AMENDMENTS SHALL BE PROVIDED AND DOCUMENTED IN ACCORDANCE WITH CITY CODE
SECTION 12-132. THE SOIL IN ALL LANDSCAPE AREAS, INCLUDING PARKWAYS AND MEDIANS, SHALL BE THOROUGHLY
LOOSENED TO A DEPTH OF NOT LESS THAN EIGHT(8) INCHES AND SOIL AMENDMENT SHALL BE THOROUGHLY
INCORPORATED INTO THE SOIL OF ALL LANDSCAPE AREAS TO A DEPTH OF AT LEAST SIX(6) INCHES BY TILLING, DISCING
OR OTHER SUITABLE METHOD, AT A RATE OF AT LEAST THREE (3) CUBIC YARDS OF SOIL AMENDMENT PER ONE
THOUSAND (1,000) SQUARE FEET OF LANDSCAPE AREA. PRIOR TO THE ISSUANCE OF ANY CERTIFICATE OF OCCUPANCY, A
WRITTEN CERTIFICATION MUST BE SUBMITTED TO THE CITY THAT ALL PLANTED AREAS, OR AREAS TO BE PLANTED, HAVE
BEEN THOROUGHLY LOOSENED AND THE SOIL AMENDED, CONSISTENT WITH THE REQUIREMENTS SET FORTH IN SECTION
12-132.
5.INSTALLATION AND GUARANTEE: ALL LANDSCAPING SHALL BE INSTALLED ACCORDING TO SOUND HORTICULTURAL
PRACTICES IN A MANNER DESIGNED TO ENCOURAGE QUICK ESTABLISHMENT AND HEALTHY GROWTH. ALL LANDSCAPING
FOR EACH PHASE MUST BE EITHER INSTALLED OR THE INSTALLATION MUST BE SECURED WITH AN IRREVOCABLE LETTER
OF CREDIT, PERFORMANCE BOND, OR ESCROW ACCOUNT FOR 125% OF THE VALUATION OF THE MATERIALS AND LABOR
PRIOR TO ISSUANCE OF A CERTIFICATE OF OCCUPANCY FOR ANY BUILDING IN SUCH PHASE.
6.MAINTENANCE: TREES AND VEGETATION, IRRIGATION SYSTEMS, FENCES, WALLS AND OTHER LANDSCAPE ELEMENTS
WITH THESE FINAL PLANS SHALL BE CONSIDERED AS ELEMENTS OF THE PROJECT IN THE SAME MANNER AS PARKING,
BUILDING MATERIALS AND OTHER SITE DETAILS. THE APPLICANT, LANDOWNER OR SUCCESSORS IN INTEREST SHALL BE
JOINTLY AND SEVERALLY RESPONSIBLE FOR THE REGULAR MAINTENANCE OF ALL LANDSCAPING ELEMENTS IN GOOD
CONDITION. ALL LANDSCAPING SHALL BE MAINTAINED FREE FROM DISEASE, PESTS, WEEDS AND LITTER, AND ALL
LANDSCAPE STRUCTURES SUCH AS FENCES AND WALLS SHALL BE REPAIRED AND REPLACED PERIODICALLY TO
MAINTAIN A STRUCTURALLY SOUND CONDITION.
7.REPLACEMENT: ANY LANDSCAPE ELEMENT THAT DIES, OR IS OTHERWISE REMOVED, SHALL BE PROMPTLY REPLACED IN
ACCORDANCE WITH THE REQUIREMENTS OF THESE PLANS.
8.THE FOLLOWING SEPARATIONS SHALL BE PROVIDED BETWEEN TREES/SHRUBS AND UTILITIES:
40 FEET BETWEEN CANOPY TREES AND STREET LIGHTS
15 FEET BETWEEN ORNAMENTAL TREES AND STREETLIGHTS
10 FEET BETWEEN TREES AND PUBLIC WATER, SANITARY AND STORM SEWER MAIN LINES
6 FEET BETWEEN TREES AND PUBLIC WATER, SANITARY AND STORM SEWER SERVICE LINES.
4 FEET BETWEEN SHRUBS AND PUBLIC WATER AND SANITARY AND STORM SEWER LINES
4 FEET BETWEEN TREES AND GAS LINES
9.ALL STREET TREES SHALL BE PLACED A MINIMUM EIGHT (8) FEET AWAY FROM THE EDGES OF DRIVEWAYS AND ALLEYS
PER LUC 3.2.1(D)(2)(a).
10.PLACEMENT OF ALL LANDSCAPING SHALL BE IN ACCORDANCE WITH THE SIGHT DISTANCE CRITERIA AS SPECIFIED BY THE
CITY OF FORT COLLINS. NO STRUCTURES OR LANDSCAPE ELEMENTS GREATER THAN 24" SHALL BE ALLOWED WITHIN THE
SIGHT DISTANCE TRIANGLE OR EASEMENTS WITH THE EXCEPTION OF DECIDUOUS TREES PROVIDED THAT THE LOWEST
BRANCH IS AT LEAST 6' FROM GRADE. ANY FENCES WITHIN THE SIGHT DISTANCE TRIANGLE OR EASEMENT MUST BE NOT
MORE THAN 42" IN HEIGHT AND OF AN OPEN DESIGN.
11.THE DEVELOPER SHALL ENSURE THAT THE FINAL LANDSCAPE PLAN IS COORDINATED WITH ALL OTHER FINAL PLAN
ELEMENTS SO THAT THE PROPOSED GRADING, STORM DRAINAGE, AND OTHER DEVELOPMENT IMPROVEMENTS DO NOT
CONFLICT WITH NOR PRECLUDE INSTALLATION AND MAINTENANCE OF LANDSCAPE ELEMENTS ON THIS PLAN.
12.MINOR CHANGES IN SPECIES AND PLANT LOCATIONS MAY BE MADE DURING CONSTRUCTION -- AS REQUIRED BY SITE
CONDITIONS OR PLANT AVAILABILITY. OVERALL QUANTITY, QUALITY, AND DESIGN CONCEPT MUST BE CONSISTENT WITH
THE APPROVED PLANS. IN THE EVENT OF CONFLICT WITH THE QUANTITIES INCLUDED IN THE PLANT LIST, SPECIES AND
QUANTITIES ILLUSTRATED SHALL BE PROVIDED. ALL CHANGES OF PLANT SPECIES AND LOCATION MUST HAVE WRITTEN
APPROVAL BY THE CITY PRIOR TO INSTALLATION.
13.ALL PLANTING BEDS SHALL BE MULCHED TO A MINIMUM DEPTH OF THREE INCHES.
14.IRRIGATED TURF SHALL BE TEXAS BLUEGRASS HYBRID 'VORTEX' BY KORBY SOD LLC OR APPROVED EQUAL.
15.EDGING BETWEEN GRASS AND SHRUB BEDS SHALL BE 18" X 4" ROLLED TOP STEEL SET LEVEL WITH TOP OF SOD OR
APPROVED EQUAL.
16.THE DEVELOPER, OR ITS SUCCESSOR(S) IN INTEREST, SHALL BE RESPONSIBLE FOR THE ONGOING IRRIGATION AND
MAINTENANCE OF THE LANDSCAPING LOCATED WITHIN THE PUBLIC RIGHTOFWAY ALONG THE PORTION OF N MASON ST
THAT ABUTS THE PROPERTY AS SHOWN ON THE FINAL DEVELOPMENT PLAN DOCUMENTS. THIS OBLIGATION MAY BE
ASSIGNED TO A HOME OWNERS ASSOCIATION DULY CONSTITUTED PURSUANT TO COLORADO STATE LAW, HOWEVER,
SHOULD SUCH HOME OWNERS ASSOCIATION BE DISSOLVED, THE OBLIGATION SHALL BECOME THAT OF THE DEVELOPER
OR ITS SUCCESSOR(S) IN INTEREST.
CITY OF FORT COLLINS LANDSCAPE NOTES
OWNER (SIGNED)Date
THE FOREGOING INSTRUMENT WAS ACKNOWLEDGED BEFORE ME
WITNESS MY HAND AND OFFICIAL SEAL.
NOTARY PUBLIC ADDRESS
THIS DAY OF
MY COMMISSION EXPIRES:
AS .
(PRINT NAME)
20 .A.D., BY
THE UNDERSIGNED DOES/DO HEREBY CERTIFY THAT I/WE ARE THE LAWFUL OWNERS OF THE REAL PROPERTY
DESCRIBED ON THIS SITE PLAN AND DO HEREBY CERTIFY THAT I/WE ACCEPT THE CONDITIONS AND RESTRICTIONS
SET FORTH ON SAID SITE PLAN.
OWNER'S CERTIFICATE
Director Signature
PLANNING CERTIFICATE
APPROVED BY THE DIRECTOR OF COMMUNITY DEVELOPMENT AND NEIGHBORHOOD SERVICES OF THE CITY OF FORT
COLLINS, COLORADO ON THIS ________ DAY OF ________, 20__.
LEGAL DESCRIPTION
HICKORY ST
N
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W WILLOX LN
SHEET LIST TABLE
SHEET NUMBER SHEET TITLE
L0.01 COVER SHEET
L1.00 SITE & LANDSCAPE PLAN
L1.01 SITE & LANDSCAPE ENLARGEMENT
L1.02 SITE & LANDSCAPE ENLARGEMENT
L1.03 MITIGATION ENLARGEMENT
L2.00 NOTES & DETAILS
L2.01 RESTORATION PLAN SUMMARY
L3.00 HYDROZONE PLAN
L4.00 TREE MITIGATION
L5.00 NATURAL HABITAT BUFFER ZONE
A TRACT OF LAND LOCATED IN THE NORTHEAST QUARTER OF SECTION 2, TOWNSHIP 7 NORTH, RANGE 69 WEST OF THE 6TH P.M.,
CITY OF FORT COLLINS, COUNTY OF LARIMER, STATE OF COLORADO
SITE
SITE PLAN NOTES
1.THE PROJECT SHALL BE CONSTRUCTED IN ACCORDANCE WITH THE FINAL PLANS. AMENDMENTS TO THE PLANS MUST BE REVIEWED AND
APPROVED BY THE CITY PRIOR TO THE IMPLEMENTATION OF ANY CHANGES TO THE PLANS.
2.REFER TO FINAL UTILITY PLANS FOR EXACT LOCATIONS AND CONSTRUCTION INFORMATION FOR STORM DRAINAGE STRUCTURES, UTILITY
MAINS AND SERVICES, PROPOSED TOPOGRAPHY, STREET IMPROVEMENTS.
3.REFER TO THE SUBDIVISION PLAT AND UTILITY PLANS FOR EXACT LOCATIONS, AREAS AND DIMENSIONS OF ALL EASEMENTS, LOTS,
TRACTS, STREETS, WALKS AND OTHER SURVEY INFORMATION.
4.ALL CONSTRUCTION WITH THIS DEVELOPMENT PLAN MUST BE COMPLETED IN ONE PHASE UNLESS A PHASING PLAN IS SHOWN WITH
THESE PLANS.
5.SIGNAGE AND ADDRESSING ARE NOT PERMITTED WITH THIS PLANNING DOCUMENT AND MUST BE APPROVED BY SEPARATE CITY PERMIT
PRIOR TO CONSTRUCTION. SIGNS MUST COMPLY WITH CITY SIGN CODE UNLESS A SPECIFIC VARIANCE IS GRANTED BY THE CITY.
6.FIRE HYDRANTS MUST MEET OR EXCEED POUDRE FIRE AUTHORITY STANDARDS. ALL BUILDINGS MUST PROVIDE AN APPROVED FIRE
EXTINGUISHING SYSTEM.
7.ALL SIDEWALKS AND RAMPS MUST CONFORM TO CITY STANDARDS. ACCESSIBLE RAMPS MUST BE PROVIDED AT ALL STREET AND DRIVE
INTERSECTIONS AND AT ALL DESIGNATED ACCESSABLE PARKING SPACES. ACCESSABLE PARKING SPACES MUST SLOPE NO MORE THAN
1:48 IN ANY DIRECTION. ALL ACCESSIBLE ROUTES MUST SLOPE NO MORE THAN 1:20 IN DIRECTION OF TRAVEL AND WITH NO MORE THAN
1:48 CROSS SLOPE.
8.COMMON OPEN SPACE AREAS AND LANDSCAPING WITHIN RIGHT OF WAYS, STREET MEDIANS, AND TRAFFIC CIRCLES ADJACENT TO
COMMON OPEN SPACE AREAS ARE REQUIRED TO BE MAINTAINED BY A PROPERTY OWNERS’ ASSOCIATION. THE PROPERTY OWNERS’
ASSOCIATION IS RESPONSIBLE FOR SNOW REMOVAL ON ALL ADJACENT STREET SIDEWALKS AND SIDEWALKS IN COMMON OPEN SPACE
AREAS.
AND, IF APPLICABLE:
9.ANY DAMAGED CURB, GUTTER AND SIDEWALK EXISTING PRIOR TO CONSTRUCTION, AS WELL AS STREETS, SIDEWALKS, CURBS AND
GUTTERS, DESTROYED, DAMAGED OR REMOVED DUE TO CONSTRUCTION OF THIS PROJECT, SHALL BE REPLACED OR RESTORED TO CITY
OF FORT COLLINS STANDARDS AT THE DEVELOPER'S EXPENSE PRIOR TO THE ACCEPTANCE OF COMPLETED IMPROVEMENTS AND/OR
PRIOR TO THE ISSUANCE OF THE FIRST CERTIFICATE OF OCCUPANCY.
8" W
S
E
E
E
E
E
E
E
E E E E E E E E E E E E E E E E E E
E
E
E
E
E
E
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E
E
E
E
E
G
G
G
G
G
G
G
G
G
G
G
I
UDUDUDUDUDUDUD
UD
UD
U
D
U
D
U
D
U
D
UD
UD
UD
UD
UD
12
"
S
S
12
"
S
S
12
"
S
S
1
2
"
S
S
1
2
"
S
S
1
2
"
S
S
1
2
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S
S
1
2
"
S
S
1
2
"
S
S
1
2
"
S
S
1
2
"
S
S
12" SS 12" SS
8"
W
8
"
W
8
"
W
8
"
W
8
"
W
8
"
W
8
"
W
8
"
W
8
"
W
8
"
W
8
"
W
8
"
W
8
"
W
8"
W
8"
W
8"
W
12" SS
E
EEEEE
E
E
T
F
W
F
X
X
X
X
X
X
X
X X
S
T
S
T
S
T
S
T
S
T
S
ELEC
F E S
M VAULT
ELEC
VAULT
ELEC
VAULT
ELEC
CABLE
CABLE ELEC
CTV CTV CTV
OH
U
OH
U
OH
U
OH
U
X
X X
X
X
CT
V
CT
V
CT
V
CT
V
CTV
CT
V
CTV CTV CTV
OHU OHU
X X
X X X X X X X
X
X
X
X
X
CTV CTV CTV
CT
V
CTV CTV
CT
V
CTV CTV
G G
G G G G G G
SS SS SS SS SS SS
SS
SS
SS
SS
SS
SS
H2O
H2O
A RV
H2O H2O
HYD
S
F E
S
F E S
W W W W W W W W W W W W W W W W W W W
XXXXXXXXXXXXX
OHU OHU OHU OHU OHU
X
X
X
X
X
X
X
X
X
X
W W W W
S
S
SS
SS
SS
SS
SS
SS
SS
D
X
X
X
X
X
W W W
SS
S
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W
W
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(
7
1
'
R
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O
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W
.
)
HIBDON COURT
(45' R.O.W.)
LOT 1
(7.790 AC)
ZONING: C-S
FUTURE CITY OF FORT COLLINS
REGIONAL DETENTION
LOT 2
(2.772 AC)
ZONING: C-S
LOT 3
(1.321 AC)
ZONING: C-S
EXISTING BUSINESSES
ZONING: C-S
EXISTING MOBILE HOME PARK
ZONING: C-S
TRACT A
(.245 AC)
DU&AE
HYDRANT, TYP.
R.O.W. TYP
EXISTING FENCE
DRY CREEK TOP
OF BANK
NHBZ BUFFER
AREA BOUNDARY
PROJECT BOUNDARY
PROJECT BOUNDARY
8'-0" TREE LAWN
6'-0" WALK
9'-0" U.E.
9'-0" U.E.
71'-0"
10'-0" U.E.
10'-0" U.E.
6'-0" U.E.
EXISTING 20'-0" WATERLINE ALIGNMENT
8'-0" TREE LAWN
6'-0" WALK
9'-0" U.E.
20'-0" EMERGENCY
ACCESS EASEMENTDRAINAGE
EASEMENT
30'-0" UTILITY & STORMWATER
EASEMENT
60'-0" DRAINAGE EASEMENT
20'-0" WATERLINE & ROW EASEMENT
10'-0" UTILITY ALIGNMENT
EXISTING 6'-0" UTILITY ALIGNMENT
ACCESS EASEMENT
10'-0" UTILITY ALIGNMENT
20'-0" DRAINAGE
EASEMENT
20'-0" DRAINAGE
EASEMENT
10'-0" U.E.
3' POWER LINE EASEMENT
TO BE VACATED BY
SEPARATE DOCUMENT
RAILROAD R.O.W.
AGREEMENT TO
BE VACATED
ENCROACHMENT EASEMENT
BY SEPARATE DOCUMENT
6'-0" U.E.
16' R.O.W. EASEMENT
10'-0" U.E.
3' POWER LINE EASEMENT
53'-6" PERPETUAL
EASEMENT FOR ELECTRIC
POWER TRANSMISSION LINE
20'-0" U.E.
30'-0" R.O.W. EASEMENT
10'-0" PSC GAS
EASEMENT
20'-0" U.E.
20'-0"
DRAINAGE
EASEMENT
FO FO
G G
SS SS
T T
UE UE
W W
FIBER OPTIC UTILITY
GAS UTILITY
STORM DRAIN UTILITY
SANITARY SEWER UTILITY
TELEPHONE UTILITY
UNDERGROUND ELECTRIC UTILITY
WATER LINE UTILITY
LOT LINES
SYMBOL DESCRIPTION
VAULT
ELEC
T
G
ELEC
EXISITING TREES TO REMAIN (SEE
INVENTORY AND MITIGATION PLAN,
SHEET L4.00)
STREET LIGHT
FIRE HYDRANT
TRANSFORMER
ELECTRIC BOX
ELECTRIC VAULT
TELEPHONE PEDESTAL
EXISTING SIGN
INLET GRATE
GAS METER
x x EXISTING FENCE
PROPOSED FENCE
LEGEND
NOTE: UTILITIES SHOWN FOR REFERENCE ONLY
TOP OF BANK
PROPERTY BOUNDARY
PROPOSED NHBZ MITIGATION
UTILITY EASEMENTU.E.
SYMBOL CODE QTY BOTANICAL / COMMON NAME CONT CAL
CANOPY NATIVE TREE
PDM 6 POPULUS DELTOIDES MONILIFERA
PLAINS COTTONWOOD B & B 2"CAL
PAC 6 POPULUS X ACUMINATA
LANCELEAF COTTONWOOD B & B 2"CAL
SAM 4 SALIX AMYGDALOIDES
PEACH LEAF WILLOW B & B 2"CAL
CANOPY TREES
ASB 2 ACER SACCHARUM 'BAILSTA'
FALL FIESTA® SUGAR MAPLE B & B 2"CAL
TCG 4 TILIA CORDATA 'GLENLEVEN'
GLENLEVEN LITTLELEAF LINDEN B & B 2"CAL
UDC 1 ULMUS DAVIDIANA 'CHOICE CITY'
CHOICE CITY DAVID ELM B & B 2"CAL
EVERGREEN NATIVE TREE
JSC 9 JUNIPERUS SCOPULORUM
ROCKY MOUNTAIN JUNIPER B & B 8` HT
1. ALL LANDSCAPE IMPROVEMENTS WITHIN THE RIGHT-OF-WAY SHALL BE INSTALLED
WHEN SUBSEQUENT LOT IS DEVELOPED AND WILL BE THE RESPONSIBILITY OF THE
RESPECTIVE DEVELOPER. TREE LOCATIONS, SPECIES, AND TREE LAWN SHOWN FOR
REFERENCE ONLY. SPECIES AND LAYOUT ARE SUBJECT TO CHANGE DEPENDENT ON
LOT ACCESS POINTS. ESCROW TO BE PROVIDED FOR IMPROVEMENTS BUILT WITH
THIS PROPOSAL.
2. ANY IMPACTS TO THE REQUIRED NATURAL HABITAT BUFFER AREA SHALL BE
MITIGATED FOR ON LOT 1. EXTENTS OF MITIGATION TO BE DETERMINED AT THE TIME
OF FUTURE PROPOSAL FOR LOT 2.
3.THE OFF-SITE NATURAL HABITAT BUFFER ZONE (NHBZ) MITIGATION LOCATED ON
IRRIGATED TURF
ROCK MULCH
UPLAND NATIVE SEED MIX
DETENTION SEED MIX
GRAVEL ROAD, RE: CIVIL 14,260 SF
NOTE: UTILITIES SHOWN FOR REFERENCE ONLY
DRAWING NUMBER:
ISSUED
PROJECT No.:
DRAWN BY:
REVIEWED BY:
SEAL:
PREPARED BY:
No.DESCRIPTION DATE
REVISIONS
No.DESCRIPTION DATE
Pl
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ORIGINAL SIZE 24X36
ENT
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NOT
F
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419 Canyon Ave. Suite 200 Fort Collins, CO 80521
phone 970.224.5828 | fax 970.225.6657 | www.ripleydesigninc.com
RIPLEY DESIGN INC.
Klara Rossouw
419 Canyon Ave. Suite 200
Fort Collins, CO 80521
p. 970.224.5828
NORTH COLLEGE 1311, LLC
262 E. Mountain Ave.
Fort Collins, CO 80524
p. 970.490.2626
ENGINEER
LAND PLANNER
NORTHERN ENGINEERING
Blaine Mathisen
301 N Howes St, Suite 100
Fort Collins, CO 80521
p. 970.221.4158
OWNER
SITE & LANDSCAPE
PLAN
PDP/FDP SUBMITTAL
MASON STREET
INFRASTRUCTURE
5
4
PDP/FDP RD 5
PDP/FDP RD 4
03/12/2024
01/31/2024
12/20/2023PDP/FDP RD 33
10/4/2023PDP RD 22
5/24/2023PDP RD 11
FORT COLLINS, CO
KR
LO
R23-008
L1.00
NORTH
0 25 50 100
SCALE: 1"=50'-0"
A PERMIT MUST BE OBTAINED FROM THE CITY FORESTER BEFORE ANY TREES OR
SHRUBS AS NOTED ON THIS PLAN ARE PLANTED, PRUNED OR REMOVED IN THE
PUBLIC RIGHT-OF-WAY. THIS INCLUDES ZONES BETWEEN THE SIDEWALK AND CURB,
MEDIANS AND OTHER CITY PROPERTY. THIS PERMIT SHALL APPROVE THE LOCATION
AND SPECIES TO BE PLANTED. FAILURE TO OBTAIN THIS PERMIT IS A VIOLATION OF
THE CITY OF FORT COLLINS CODE SUBJECT TO CITATION (SECTION 27-31) AND MAY
ALSO RESULT IN REPLACING OR RELOCATING TREES AND A HOLD ON CERTIFICATE
OF OCCUPANCY.
PLANT SCHEDULE
8" W 8" W
S
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
12
"
S
S
12
"
S
S
12
"
S
S
12
"
S
S
12
"
S
S
12
"
S
S
1
2
"
S
S
1
2
"
S
S
1
2
"
S
S
1
2
"
S
S
1
2
"
S
S
1
2
"
S
S
1
2
"
S
S
1
2
"
S
S
1
2
"
S
S
8
"
W
8
"
W
8
"
W
8
"
W
8
"
W
8
"
W
8
"
W
8
"
W
8
"
W
8
"
W
8"
W
8"
W
8"
W
8"
W
8"
W
8"
W
8"
W
12" SS 12" SS 12" SS
EEEEEEEEEEE
E
E
E
E
T
F
W
F
ELEC
CTV
CTV CTV CTV CTV CTV CTV CTV
OHU OHU OHU OHU OHU OHU OHU
CTV
X G G G G
G
G G G G G G G G G
SS SS SS SS SS SS SS SS SS
H Y D
S
XX
X
X
W W W W W W W W W W
W W
SSSSSSSS
S
S
S
S
W
W
2 - ASB
4 - TCG
M
A
S
O
N
S
T
R
E
E
T
(
7
1
'
R
.
O
.
W
.
)
HIBDON COURT
(45' R.O.W.)
LOT 2
(2.772 AC)
ZONING: C-S
LOT 3
(1.321 AC)
ZONING: C-S
TRACT A
(.245 AC)
DU&AE
R.O.W. TYP
EXISTING TREES TO
REMAIN, TYP.
STREETLIGHT, TYP.
8'-0" TREE LAWN
6'-0" WALK
9'-0" UTILITY EASEMENT
9'-0" UTILITY EASEMENT
10'-0" U.E.
10'-0" U.E.
10'-0" U.E.
9'-0" U.E.
20'-0" DRAINAGE EASEMENT
3' POWER LINE EASEMENT
TO BE VACATED BY
SEPARATE DOCUMENT
ENCROACHMENT EASEMENT
BY SEPARATE DOCUMENT
FO FO
G G
SS SS
T T
UE UE
W W
FIBER OPTIC UTILITY
GAS UTILITY
STORM DRAIN UTILITY
SANITARY SEWER UTILITY
TELEPHONE UTILITY
UNDERGROUND ELECTRIC UTILITY
WATER LINE UTILITY
LOT LINES
SYMBOL DESCRIPTION
VAULT
ELEC
T
G
ELEC
EXISITING TREES TO REMAIN (SEE
INVENTORY AND MITIGATION PLAN,
SHEET L4.00)
STREET LIGHT
FIRE HYDRANT
TRANSFORMER
ELECTRIC BOX
ELECTRIC VAULT
TELEPHONE PEDESTAL
EXISTING SIGN
INLET GRATE
GAS METER
x x EXISTING FENCE
PROPOSED FENCE
LEGEND
NOTE: UTILITIES SHOWN FOR REFERENCE ONLY
TOP OF BANK
PROPERTY BOUNDARY
PROPOSED NHBZ MITIGATION
UTILITY EASEMENTU.E.
CANOPY TREES
ASB 2 ACER SACCHARUM 'BAILSTA'
FALL FIESTA® SUGAR MAPLE B & B 2"CAL
TCG 4 TILIA CORDATA 'GLENLEVEN'
GLENLEVEN LITTLELEAF LINDEN B & B 2"CAL
UDC 1 ULMUS DAVIDIANA 'CHOICE CITY'
CHOICE CITY DAVID ELM B & B 2"CAL
1. ALL LANDSCAPE IMPROVEMENTS WITHIN THE RIGHT-OF-WAY SHALL BE INSTALLED
WHEN SUBSEQUENT LOT IS DEVELOPED AND WILL BE THE RESPONSIBILITY OF THE
RESPECTIVE DEVELOPER. TREE LOCATIONS, SPECIES, AND TREE LAWN SHOWN FOR
REFERENCE ONLY. SPECIES AND LAYOUT ARE SUBJECT TO CHANGE DEPENDENT ON
LOT ACCESS POINTS. ESCROW TO BE PROVIDED FOR IMPROVEMENTS BUILT WITH
THIS PROPOSAL.
2. ANY IMPACTS TO THE REQUIRED NATURAL HABITAT BUFFER AREA SHALL BE
MITIGATED FOR ON LOT 1. EXTENTS OF MITIGATION TO BE DETERMINED AT THE TIME
OF FUTURE PROPOSAL FOR LOT 2.
3.THE OFF-SITE NATURAL HABITAT BUFFER ZONE (NHBZ) MITIGATION LOCATED ON
IRRIGATED TURF
ROCK MULCH
UPLAND NATIVE SEED MIX
DETENTION SEED MIX
GRAVEL ROAD, RE: CIVIL 14,260 SF
NOTE: UTILITIES SHOWN FOR REFERENCE ONLY
DRAWING NUMBER:
ISSUED
PROJECT No.:
DRAWN BY:
REVIEWED BY:
SEAL:
PREPARED BY:
No.DESCRIPTION DATE
REVISIONS
No.DESCRIPTION DATE
Pl
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ORIGINAL SIZE 24X36
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N
419 Canyon Ave. Suite 200 Fort Collins, CO 80521
phone 970.224.5828 | fax 970.225.6657 | www.ripleydesigninc.com
RIPLEY DESIGN INC.
Klara Rossouw
419 Canyon Ave. Suite 200
Fort Collins, CO 80521
p. 970.224.5828
NORTH COLLEGE 1311, LLC
262 E. Mountain Ave.
Fort Collins, CO 80524
p. 970.490.2626
ENGINEER
LAND PLANNER
NORTHERN ENGINEERING
Blaine Mathisen
301 N Howes St, Suite 100
Fort Collins, CO 80521
p. 970.221.4158
OWNER
SITE & LANDSCAPE
ENLARGEMENT
PDP/FDP SUBMITTAL
MASON STREET
INFRASTRUCTURE
5
4
PDP/FDP RD 5
PDP/FDP RD 4
03/12/2024
01/31/2024
12/20/2023PDP/FDP RD 33
10/4/2023PDP RD 22
5/24/2023PDP RD 11
FORT COLLINS, CO
KR
LO
R23-008
L1.01
NORTH
0 10 20 40
SCALE: 1"=20'-0"
A PERMIT MUST BE OBTAINED FROM THE CITY FORESTER BEFORE ANY TREES OR
SHRUBS AS NOTED ON THIS PLAN ARE PLANTED, PRUNED OR REMOVED IN THE
PUBLIC RIGHT-OF-WAY. THIS INCLUDES ZONES BETWEEN THE SIDEWALK AND CURB,
MEDIANS AND OTHER CITY PROPERTY. THIS PERMIT SHALL APPROVE THE LOCATION
AND SPECIES TO BE PLANTED. FAILURE TO OBTAIN THIS PERMIT IS A VIOLATION OF
THE CITY OF FORT COLLINS CODE SUBJECT TO CITATION (SECTION 27-31) AND MAY
ALSO RESULT IN REPLACING OR RELOCATING TREES AND A HOLD ON CERTIFICATE
OF OCCUPANCY.
PLANT SCHEDULE
S
E E E E E E E E E E E E E E E E E E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
G
G
G
G
G
G
G
G
G
G
G
G
I
UDUDUDUDUDUDUDUDUDUDUDUDUD
1
2
"
S
S
1
2
"
S
S
1
2
"
S
S
1
2
"
S
S
1
2
"
S
S
1
2
"
S
S
1
2
"
S
S
1
2
"
S
S
1
2
"
S
S
1
2
"
S
S
1
2
"
S
S
1
2
"
S
S
1
2
"
S
S
8
"
W
8
"
W
8
"
W
8
"
W
8
"
W
8
"
W
8" W
8
"
W
8
"
W
8
"
W
8
"
W
8
"
W
8
"
W
8
"
W
8
"
W
8
"
W
8
"
W
8
"
W
E
E
X
X
X
X
X
X
X
X
X
X
S
T
S
T
S
T
S
T
S
T
H2O
F
E
S
F
E
S
W W W W W W W W W W W W W W W W W W W W
XXXXXXXXXXXXXXXXXXXX
X
X
X
X
X
X
X
X
W W
1 - UDC
PROJECT BOUNDARY
M
A
S
O
N
S
T
R
E
E
T
(
7
1
'
R
.
O
.
W
.
)
LOT 2
(2.645 AC)
ZONING: C-S
LOT 1
(7.790 AC)
ZONING: C-S
FUTURE CITY OF FORT COLLINS REGIONAL DETENTION
HYDRANT, TYP.
EXISTING TREES TO
REMAIN, TYP.
STREETLIGHT, TYP.
EMERGENCY ACCESS EASEMENT
R.O.W. TYP8'-0" TREE LAWN
6'-0" WALK
9'-0" UTILITY EASEMENT
EXISTING 6'-0" UTILITY ALIGNMENT
60'-0" DRAINAGE EASEMENT
ACCESS EASEMENT
20'-0" U.E.
FO FO
G G
SS SS
T T
UE UE
W W
FIBER OPTIC UTILITY
GAS UTILITY
STORM DRAIN UTILITY
SANITARY SEWER UTILITY
TELEPHONE UTILITY
UNDERGROUND ELECTRIC UTILITY
WATER LINE UTILITY
LOT LINES
SYMBOL DESCRIPTION
VAULT
ELEC
T
G
ELEC
EXISITING TREES TO REMAIN (SEE
INVENTORY AND MITIGATION PLAN,
SHEET L4.00)
STREET LIGHT
FIRE HYDRANT
TRANSFORMER
ELECTRIC BOX
ELECTRIC VAULT
TELEPHONE PEDESTAL
EXISTING SIGN
INLET GRATE
GAS METER
x x EXISTING FENCE
PROPOSED FENCE
LEGEND
NOTE: UTILITIES SHOWN FOR REFERENCE ONLY
TOP OF BANK
PROPERTY BOUNDARY
PROPOSED NHBZ MITIGATION
UTILITY EASEMENTU.E.
1. ALL LANDSCAPE IMPROVEMENTS WITHIN THE RIGHT-OF-WAY SHALL BE INSTALLED
WHEN SUBSEQUENT LOT IS DEVELOPED AND WILL BE THE RESPONSIBILITY OF THE
RESPECTIVE DEVELOPER. TREE LOCATIONS, SPECIES, AND TREE LAWN SHOWN FOR
REFERENCE ONLY. SPECIES AND LAYOUT ARE SUBJECT TO CHANGE DEPENDENT ON
LOT ACCESS POINTS. ESCROW TO BE PROVIDED FOR IMPROVEMENTS BUILT WITH
THIS PROPOSAL.
2. ANY IMPACTS TO THE REQUIRED NATURAL HABITAT BUFFER AREA SHALL BE
MITIGATED FOR ON LOT 1. EXTENTS OF MITIGATION TO BE DETERMINED AT THE TIME
OF FUTURE PROPOSAL FOR LOT 2.
3.THE OFF-SITE NATURAL HABITAT BUFFER ZONE (NHBZ) MITIGATION LOCATED ON
CANOPY TREES
ASB 2 ACER SACCHARUM 'BAILSTA'
FALL FIESTA® SUGAR MAPLE B & B 2"CAL
TCG 4 TILIA CORDATA 'GLENLEVEN'
GLENLEVEN LITTLELEAF LINDEN B & B 2"CAL
UDC 1 ULMUS DAVIDIANA 'CHOICE CITY'
CHOICE CITY DAVID ELM B & B 2"CAL
IRRIGATED TURF
ROCK MULCH
UPLAND NATIVE SEED MIX
DETENTION SEED MIX
GRAVEL ROAD, RE: CIVIL 14,260 SF
NOTE: UTILITIES SHOWN FOR REFERENCE ONLY
DRAWING NUMBER:
ISSUED
PROJECT No.:
DRAWN BY:
REVIEWED BY:
SEAL:
PREPARED BY:
No.DESCRIPTION DATE
REVISIONS
No.DESCRIPTION DATE
Pl
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ORIGINAL SIZE 24X36
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419 Canyon Ave. Suite 200 Fort Collins, CO 80521
phone 970.224.5828 | fax 970.225.6657 | www.ripleydesigninc.com
RIPLEY DESIGN INC.
Klara Rossouw
419 Canyon Ave. Suite 200
Fort Collins, CO 80521
p. 970.224.5828
NORTH COLLEGE 1311, LLC
262 E. Mountain Ave.
Fort Collins, CO 80524
p. 970.490.2626
ENGINEER
LAND PLANNER
NORTHERN ENGINEERING
Blaine Mathisen
301 N Howes St, Suite 100
Fort Collins, CO 80521
p. 970.221.4158
OWNER
SITE & LANDSCAPE
ENLARGEMENT
PDP/FDP SUBMITTAL
MASON STREET
INFRASTRUCTURE
5
4
PDP/FDP RD 5
PDP/FDP RD 4
03/12/2024
01/31/2024
12/20/2023PDP/FDP RD 33
10/4/2023PDP RD 22
5/24/2023PDP RD 11
FORT COLLINS, CO
KR
LO
R23-008
L1.02
NORTH
0 10 20 40
SCALE: 1"=20'-0"
A PERMIT MUST BE OBTAINED FROM THE CITY FORESTER BEFORE ANY TREES OR
SHRUBS AS NOTED ON THIS PLAN ARE PLANTED, PRUNED OR REMOVED IN THE
PUBLIC RIGHT-OF-WAY. THIS INCLUDES ZONES BETWEEN THE SIDEWALK AND CURB,
MEDIANS AND OTHER CITY PROPERTY. THIS PERMIT SHALL APPROVE THE LOCATION
AND SPECIES TO BE PLANTED. FAILURE TO OBTAIN THIS PERMIT IS A VIOLATION OF
THE CITY OF FORT COLLINS CODE SUBJECT TO CITATION (SECTION 27-31) AND MAY
ALSO RESULT IN REPLACING OR RELOCATING TREES AND A HOLD ON CERTIFICATE
OF OCCUPANCY.
PLANT SCHEDULE
E
E
E
E
E
E
E
E
U
D
U
D
U
D
U
D
U
D
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
X X X
X X X X X X X X X X X X X X X X X X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
3 - PAC
3 - JSC
3 - JSC
3 - JSC
3 - PAC
9 - SOC
3 - SOC
3 - ACA
5 - ACA
5 - AAL
3 - RAU
3 - AAL
6 - RAU
3 - SOC
6 - RAU
3 - SOC
3 - PDM
3 - SAM
1 - PDM
1 - SAM
2 - PDM
PROJECT BOUNDARY
DRY CREEK TOP
OF BANK
NHBZ BUFFER
AREA BOUNDARY
FIELD LOCATE DOWNED
LOGS FROM SITE TREE
REMOVAL, TYP.
STORE LOGS WITHIN THE
GROVE OF TREES UNTIL
THE CITY'S REGIONAL
STORM WATER PROJECT IS
COMPLETE. AT WHICH
TIME, RELOCATE LOGS TO
THE LOCATIONS SHOWN.
LOCATION OF PLANTINGS WILL NEED TO BE
VERIFIED WITH ENVIRONMENTAL PLANNING
AND STORMWATER AT THE TIME OF PLANTING
TO DETERMINE CURRENT GRADING PLANS.
HAS CONTEXT MENU
RAILROAD R.O.W.
AGREEMENT TO
BE VACATED
FO FO
G G
SS SS
T T
UE UE
W W
FIBER OPTIC UTILITY
GAS UTILITY
STORM DRAIN UTILITY
SANITARY SEWER UTILITY
TELEPHONE UTILITY
UNDERGROUND ELECTRIC UTILITY
WATER LINE UTILITY
LOT LINES
SYMBOL DESCRIPTION
VAULT
ELEC
T
G
ELEC
EXISITING TREES TO REMAIN (SEE
INVENTORY AND MITIGATION PLAN,
SHEET L4.00)
STREET LIGHT
FIRE HYDRANT
TRANSFORMER
ELECTRIC BOX
ELECTRIC VAULT
TELEPHONE PEDESTAL
EXISTING SIGN
INLET GRATE
GAS METER
x x EXISTING FENCE
PROPOSED FENCE
LEGEND
NOTE: UTILITIES SHOWN FOR REFERENCE ONLY
TOP OF BANK
PROPERTY BOUNDARY
PROPOSED NHBZ MITIGATION
UTILITY EASEMENTU.E.
1. ALL LANDSCAPE IMPROVEMENTS WITHIN THE RIGHT-OF-WAY SHALL BE INSTALLED
WHEN SUBSEQUENT LOT IS DEVELOPED AND WILL BE THE RESPONSIBILITY OF THE
RESPECTIVE DEVELOPER. TREE LOCATIONS, SPECIES, AND TREE LAWN SHOWN FOR
REFERENCE ONLY. SPECIES AND LAYOUT ARE SUBJECT TO CHANGE DEPENDENT ON
LOT ACCESS POINTS. ESCROW TO BE PROVIDED FOR IMPROVEMENTS BUILT WITH
THIS PROPOSAL.
2. ANY IMPACTS TO THE REQUIRED NATURAL HABITAT BUFFER AREA SHALL BE
MITIGATED FOR ON LOT 1. EXTENTS OF MITIGATION TO BE DETERMINED AT THE TIME
OF FUTURE PROPOSAL FOR LOT 2.
3.THE OFF-SITE NATURAL HABITAT BUFFER ZONE (NHBZ) MITIGATION LOCATED ON
LOT 1 OF THE LIMITS OF DISTURBANCE MUST MEET THE REQUIREMENTS OF FORT
COLLINS LAND USE CODE 3.4.1. THE ONGOING RESTORATION GOALS AND
PERFORMANCE CRITERIA RELATED TO THE PLAN'S OFF-SITE MITIGATION IS THE
RESPONSIBILITY OF FORT COLLINS STORMWATER UTILITIES AND AN ESCROW
RELATED TO THE NHBZ PERFORMANCE CRITERIA WILL BE COLLECTED AT THE TIME A
MINOR AMENDMENT IS SUBMITTED FOR THE FUTURE DEVELOPMENT OF HICKORY
POND.
SYMBOL CODE QTY BOTANICAL / COMMON NAME CONT CAL
CANOPY NATIVE TREE
PDM 6 POPULUS DELTOIDES MONILIFERA
PLAINS COTTONWOOD B & B 2"CAL
PAC 6 POPULUS X ACUMINATA
LANCELEAF COTTONWOOD B & B 2"CAL
SAM 4 SALIX AMYGDALOIDES
PEACH LEAF WILLOW B & B 2"CAL
EVERGREEN NATIVE TREE
JSC 9 JUNIPERUS SCOPULORUM
ROCKY MOUNTAIN JUNIPER B & B 8` HT
SYMBOL CODE QTY BOTANICAL / COMMON NAME SIZE HYDROZONE
SHRUBS
AAL 8 AMELANCHIER ALNIFOLIA
SERVICEBERRY 5 GAL
ACA 8 ATRIPLEX CANESCENS
FOURWING SALTBUSH 5 GAL
RAU 15 RIBES AUREUM
GOLDEN CURRANT 5 GAL
SOC 18 SYMPHORICARPOS OCCIDENTALIS
WESTERN SNOWBERRY 5 GAL
IRRIGATED TURF
ROCK MULCH
UPLAND NATIVE SEED MIX
DETENTION SEED MIX
GRAVEL ROAD, RE: CIVIL 14,260 SF
NOTE: UTILITIES SHOWN FOR REFERENCE ONLY
DRAWING NUMBER:
ISSUED
PROJECT No.:
DRAWN BY:
REVIEWED BY:
SEAL:
PREPARED BY:
No.DESCRIPTION DATE
REVISIONS
No.DESCRIPTION DATE
Pl
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B
y
:
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T
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A
T
I
O
N
E
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ORIGINAL SIZE 24X36
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419 Canyon Ave. Suite 200 Fort Collins, CO 80521
phone 970.224.5828 | fax 970.225.6657 | www.ripleydesigninc.com
RIPLEY DESIGN INC.
Klara Rossouw
419 Canyon Ave. Suite 200
Fort Collins, CO 80521
p. 970.224.5828
NORTH COLLEGE 1311, LLC
262 E. Mountain Ave.
Fort Collins, CO 80524
p. 970.490.2626
ENGINEER
LAND PLANNER
NORTHERN ENGINEERING
Blaine Mathisen
301 N Howes St, Suite 100
Fort Collins, CO 80521
p. 970.221.4158
OWNER
MITIGATION
ENLARGEMENT
PDP/FDP SUBMITTAL
MASON STREET
INFRASTRUCTURE
5
4
PDP/FDP RD 5
PDP/FDP RD 4
03/12/2024
01/31/2024
12/20/2023PDP/FDP RD 33
10/4/2023PDP RD 22
5/24/2023PDP RD 11
FORT COLLINS, CO
KR
LO
R23-008
L1.03
NORTH
0 10 20 40
SCALE: 1"=20'-0"
FUTURE MITIGATION PLANT SCHEDULE
A PERMIT MUST BE OBTAINED FROM THE CITY FORESTER BEFORE ANY TREES OR
SHRUBS AS NOTED ON THIS PLAN ARE PLANTED, PRUNED OR REMOVED IN THE
PUBLIC RIGHT-OF-WAY. THIS INCLUDES ZONES BETWEEN THE SIDEWALK AND CURB,
MEDIANS AND OTHER CITY PROPERTY. THIS PERMIT SHALL APPROVE THE LOCATION
AND SPECIES TO BE PLANTED. FAILURE TO OBTAIN THIS PERMIT IS A VIOLATION OF
THE CITY OF FORT COLLINS CODE SUBJECT TO CITATION (SECTION 27-31) AND MAY
ALSO RESULT IN REPLACING OR RELOCATING TREES AND A HOLD ON CERTIFICATE
OF OCCUPANCY.
NOTE: NEW LANDSCAPE IN THE NHBZ WILL BE ESCROWED AND INSTALLED AT THE
TIME OF FUTURE PROPOSAL FOR LOT 2.
SYMBOL CODE QTY BOTANICAL / COMMON NAME CONT CAL
CANOPY NATIVE TREE
PDM 6 POPULUS DELTOIDES MONILIFERA
PLAINS COTTONWOOD B & B 2"CAL
PAC 6 POPULUS X ACUMINATA
LANCELEAF COTTONWOOD B & B 2"CAL
SAM 4 SALIX AMYGDALOIDES
PEACH LEAF WILLOW B & B 2"CAL
CANOPY TREES
ASB 2 ACER SACCHARUM 'BAILSTA'
FALL FIESTA® SUGAR MAPLE B & B 2"CAL
TCG 4 TILIA CORDATA 'GLENLEVEN'
GLENLEVEN LITTLELEAF LINDEN B & B 2"CAL
UDC 1 ULMUS DAVIDIANA 'CHOICE CITY'
CHOICE CITY DAVID ELM B & B 2"CAL
EVERGREEN NATIVE TREE
JSC 9 JUNIPERUS SCOPULORUM
ROCKY MOUNTAIN JUNIPER B & B 8` HT
SYMBOL CODE QTY BOTANICAL / COMMON NAME SIZE HYDROZONE
SHRUBS
AAL 8 AMELANCHIER ALNIFOLIA
SERVICEBERRY 5 GAL
ACA 8 ATRIPLEX CANESCENS
FOURWING SALTBUSH 5 GAL
RAU 15 RIBES AUREUM
GOLDEN CURRANT 5 GAL
SOC 18 SYMPHORICARPOS OCCIDENTALIS
WESTERN SNOWBERRY 5 GAL
DRAWING NUMBER:
ISSUED
PROJECT No.:
DRAWN BY:
REVIEWED BY:
SEAL:
PREPARED BY:
No.DESCRIPTION DATE
REVISIONS
No.DESCRIPTION DATE
Pl
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t
t
e
d
B
y
:
Li
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d
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S
&
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A
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S
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A
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S
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ORIGINAL SIZE 24X36
ENT
I
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N
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I
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G
S
NOT
F
O
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CON
S
T
R
U
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T
I
O
N
419 Canyon Ave. Suite 200 Fort Collins, CO 80521
phone 970.224.5828 | fax 970.225.6657 | www.ripleydesigninc.com
RIPLEY DESIGN INC.
Klara Rossouw
419 Canyon Ave. Suite 200
Fort Collins, CO 80521
p. 970.224.5828
NORTH COLLEGE 1311, LLC
262 E. Mountain Ave.
Fort Collins, CO 80524
p. 970.490.2626
ENGINEER
LAND PLANNER
NORTHERN ENGINEERING
Blaine Mathisen
301 N Howes St, Suite 100
Fort Collins, CO 80521
p. 970.221.4158
OWNER
NOTES & DETAILS
PDP/FDP SUBMITTAL
MASON STREET
INFRASTRUCTURE
5
4
PDP/FDP RD 5
PDP/FDP RD 4
03/12/2024
01/31/2024
12/20/2023PDP/FDP RD 33
10/4/2023PDP RD 22
5/24/2023PDP RD 11
FORT COLLINS, CO
KR
LO
R23-008
L2.00
STREET TREE NOTES
1.A PERMIT MUST BE OBTAINED FROM THE CITY FORESTER BEFORE ANY TREES OR SHRUBS AS NOTED ON THIS PLAN
ARE PLANTED, PRUNED OR REMOVED IN THE PUBLIC RIGHT-OF-WAY. THIS INCLUDES ZONES BETWEEN THE SIDEWALK
AND CURB, MEDIANS AND OTHER CITY PROPERTY. THIS PERMIT SHALL APPROVE THE LOCATION AND SPECIES TO BE
PLANTED. FAILURE TO OBTAIN THIS PERMIT IS A VIOLATION OF THE CITY OF FORT COLLINS CODE SUBJECT TO CITATION
(SECTION 27-31) AND MAY ALSO RESULT IN REPLACING OR RELOCATING TREES AND A HOLD ON CERTIFICATE OF
OCCUPANCY.
2.CONTACT THE CITY FORESTER TO INSPECT ALL STREET TREE PLANTINGS AT THE COMPLETION OF EACH PHASE OF THE
DEVELOPMENT. ALL MUST BE INSTALLED AS SHOWN ON THE LANDSCAPE PLAN. APPROVAL OF STREET TREE PLANTING
IS REQUIRED BEFORE FINAL APPROVAL OF EACH PHASE.
3.STREET LANDSCAPING, INCLUDING STREET TREES, SHALL BE SELECTED IN ACCORDANCE WITH ALL CITY CODES AND
POLICIES. ALL TREE PRUNING AND REMOVAL WORKS SHALL BE PERFORMED BY A CITY OF FORT COLLINS LICENSED
ARBORS WHERE REQUIRED BY CODE.STREET TREES SHALL BE SUPPLIED AND PLANTED BY THE DEVELOPER USING A
QUALIFIED LANDSCAPE CONTRACTOR.
4.THE DEVELOPER SHALL REPLACE DEAD OR DYING STREET TREES AFTER PLANTING UNTIL FINAL MAINTENANCE
INSPECTION AND ACCEPTANCE BY THE CITY OF FORT COLLINS FORESTRY DIVISION. ALL STREET TREES IN THE
PROJECT MUST BE ESTABLISHED, WITH AN APPROVED SPECIES AND OF ACCEPTABLE CONDITION PRIOR TO
ACCEPTANCE.
5.SUBJECT TO APPROVAL BY THE CITY FORESTER -- STREET TREE LOCATIONS MAY BE ADJUSTED TO ACCOMMODATE
DRIVEWAY LOCATIONS, UTILITY SEPARATIONS BETWEEN TREES, STREET SIGNS AND STREET LIGHTS. STREET TREES
TO BE CENTERED IN THE MIDDLE OF THE LOT TO THE EXTENT FEASIBLE. QUANTITIES SHOWN ON PLAN MUST BE
INSTALLED UNLESS A REDUCTION IS APPROVED BY THE CITY TO MEET SEPARATION STANDARDS.
TREE PROTECTION NOTES
TREE DIAMETER AT BREAST HEIGHT (INCHES)AUGER DISTANCE FROM FACE OF TREE (FEET)
0-2 1
3-4 2
5-9 5
10-14 10
15-19 12
OVER 19 15
1.ALL EXISTING TREES WITHIN THE LIMITS OF THE DEVELOPMENT AND WITHIN ANY NATURAL AREA BUFFER ZONES SHALL
REMAIN AND BE PROTECTED UNLESS NOTED ON THESE PLANS FOR REMOVAL.
2.WITHIN THE DRIP LINE OF ANY PROTECTED EXISTING TREE, THERE SHALL BE NO CUT OR FILL OVER A FOUR-INCH
DEPTH UNLESS A QUALIFIED ARBORIST OR FORESTER HAS EVALUATED AND APPROVED THE DISTURBANCE.
3.ALL PROTECTED EXISTING TREES SHALL BE PRUNED TO THE CITY OF FORT COLLINS FORESTRY STANDARDS. TREE
PRUNING AND REMOVAL SHALL BE PERFORMED BY A BUSINESS THAT HOLDS A CURRENT CITY OF FORT COLLINS
ARBORIST LICENSE WHERE REQUIRED BY CODE.
4.PRIOR TO AND DURING CONSTRUCTION, BARRIERS SHALL BE ERECTED AROUND ALL PROTECTED EXISTING TREES
WITH SUCH BARRIERS TO BE OF ORANGE FENCING A MINIMUM OF FOUR (4) FEET IN HEIGHT, SECURED WITH METAL
T-POSTS, NO CLOSER THAN SIX (6) FEET FROM THE TRUNK OR ONE-HALF (½) OF THE DRIP LINE, WHICHEVER IS
GREATER. THERE SHALL BE NO STORAGE OR MOVEMENT OF EQUIPMENT, MATERIAL, DEBRIS OR FILL WITHIN THE
FENCED TREE PROTECTION ZONE.
5.DURING THE CONSTRUCTION STAGE OF DEVELOPMENT, THE APPLICANT SHALL PREVENT THE CLEANING OF
EQUIPMENT OR MATERIAL OR THE STORAGE AND DISPOSAL OF WASTE MATERIAL SUCH AS PAINTS, OILS, SOLVENTS,
ASPHALT, CONCRETE, MOTOR OIL OR ANY OTHER MATERIAL HARMFUL TO THE LIFE OF A TREE WITHIN THE DRIP LINE
OF ANY PROTECTED TREE OR GROUP OF TREES.
6.NO DAMAGING ATTACHMENT, WIRES, SIGNS OR PERMITS MAY BE FASTENED TO ANY PROTECTED TREE.
7.LARGE PROPERTY AREAS CONTAINING PROTECTED TREES AND SEPARATED FROM CONSTRUCTION OR LAND
CLEARING AREAS, ROAD RIGHTS-OF-WAY AND UTILITY EASEMENTS MAY BE "RIBBONED OFF," RATHER THAN ERECTING
PROTECTIVE FENCING AROUND EACH TREE AS REQUIRED IN SUBSECTION (G)(3) ABOVE. THIS MAY BE ACCOMPLISHED
BY PLACING METAL T-POST STAKES A MAXIMUM OF FIFTY (50) FEET APART AND TYING RIBBON OR ROPE FROM
STAKE-TO-STAKE ALONG THE OUTSIDE PERIMETERS OF SUCH AREAS BEING CLEARED.
8.THE INSTALLATION OF UTILITIES, IRRIGATION LINES OR ANY UNDERGROUND FIXTURE REQUIRING EXCAVATION DEEPER
THAN SIX (6) INCHES SHALL BE ACCOMPLISHED BY BORING UNDER THE ROOT SYSTEM OF PROTECTED EXISTING TREES
AT A MINIMUM DEPTH OF TWENTY-FOUR (24) INCHES. THE AUGER DISTANCE IS ESTABLISHED FROM THE FACE OF THE
TREE (OUTER BARK) AND IS SCALED FROM TREE DIAMETER AT BREAST HEIGHT AS DESCRIBED IN THE CHART BELOW:
9.NO TREES SHALL BE REMOVED DURING THE SONGBIRD NESTING SEASON (FEBRUARY 1 TO JULY 31) WITHOUT FIRST
HAVING A PROFESSIONAL ECOLOGIST OR WILDLIFE BIOLOGIST COMPLETE A NESTING SURVEY 5-7 DAYS BEFORE TREE
REMOVAL OR TRIMMING TO IDENTIFY ANY ACTIVE NESTS EXISTING ON THE PROJECT SITE. THE SURVEY SHALL BE SENT
TO THE CITY ENVIRONMENTAL PLANNER. IF ACTIVE NESTS ARE FOUND, THE CITY WILL COORDINATE WITH RELEVANT
STATE AND FEDERAL REPRESENTATIVES TO DETERMINE WHETHER ADDITIONAL RESTRICTIONS ON TREE REMOVAL
AND CONSTRUCTION APPLY.
P
R
E
V
A
I
L
I
N
G
W
I
N
D
NOTES:
SET SO THAT TOP OF ROOT 1-2"
HIGHER THAN FINISHED GRADE
MARK NORTH SIDE OF TREE IN
NURSERY AND ROTATE TREE TO
FACE NORTH AT THE SITE
WHENEVER POSSIBLE
2 STRAND 12 GAUGE GAL. WIRE
(TWIST TO TIGHTEN) &
GROMMETED NYLON STRAPS
THREE (3) TWO INCH LODGE POLE STAKES
DRIVEN (MIN. 24") FIRMLY INTO UNDISTURBED
SOIL OUTSIDE OF PLANTING HOLE BEFORE
BACKFILLING STAKE ABOVE FIRST BRANCHES
OR AS NECESSARY FOR FIRM SUPPORT
REMOVE ALL WIRE, TWINE BURLAP, MESH
AND CONTAINERS FROM ENTIRE ROOT
BALL AND TRUNK
PLAN VIEW - THREE STAKES
3 X BALL DIA.
TREE PLANTING DETAIL - WOOD POSTS
SCALE: NTS
SCARIFY SIDES OF HOLE LEAVING
1:1 SLOPE
ROUND TOPPED SOIL BERM 4"
HIGH X 8" WIDE ABOVE ROOT
BALL SURFACE SHALL BE
CONSTRUCTED AROUND THE
ROOT BALL. BERM SHALL BEGIN
AT ROOT BALL PERIPHERY. (OMIT
IN TURF AREAS)
BACKFILL WITH BLEND OF EXISTING SOIL
AND A MAXIMUM 20% (BY VOL.) ORGANIC
MATERIAL PLACE FIRMLY BUT DON'T TAMP
OR COMPACT AROUND ROOT BALL. WATER
WATER THOROUGHLY TO SETTLE AND
REMOVE AIR POCKETS. PRIOR TO
MULCHING, LIGHTLY TAMP SOIL AROUND
THE ROOT BALL IN 6" LIFTS TO BRACE
TREE. DO NOT OVER COMPACT. WHEN THE
PLANTING HOLE HAS BEEN BACKFILLED,
POUR WATER AROUND THE ROOT BALL TO
SETTLE THE SOIL.
4" DEEP MULCH RING PLACED A MINIMUM
OF 6' IN DIAMETER. 1" MULCH OVER ROOT
BALL. DO NOT PLACE MULCH IN CONTACT
WITH TREE TRUNK
BOTTOM OF ROOT BALL RESTS ON
EXISTING OR RECOMPACTED SOIL
L-PL2-PLA-02
1 TREE PROTECTION FENCE
SCALE: NTS
LOWER CANOPY - CONTACT THE
CITY FORESTER IF POTENTIAL
FOR DAMAGE EXISTS AND/OR IF
PRUNING, INCLUDING BUT NOT
LIMITED TO CLEARANCE FOR
BUILDING(S) AND/OR
CONSTRUCTION SCAFFOLDING, IS
NEEDED.
CHAIN LINK FENCE
(OPTIONAL)
NOTES
1.DAMAGE TO PROTECTED TREES IS SUBJECT TO PENALTY PER CITY ORDINANCE.
2.TREE PROTECTION SHALL BE INSTALLED PRIOR TO COMMENCEMENT OF DEMOLITION/CONSTRUCTION ACTIVITIES AND
MAY ONLY BE REMOVED TEMPORARILY IF TRUNK PROTECTION IS INSTALLED. IT SHALL REMAIN IN PLACE UNTIL
CERTIFICATE OF OCCUPANCY IS ISSUED.
3.NO MATERIALS, DEBRIS, EQUIPMENT, OR SITE AMENITIES SHALL BE STORED WITHIN THE TREE PROTECTION FENCE.
4.WATER AT LEAST EVERY 14 DAYS DURING CONSTRUCTION PERIOD BY FORMING SUITABLE DIKES AND/OR SOAKING
DEVICES AT DRIP LINE AND APPLYING APPROXIMATELY 6 INCHES OF WATER EACH TIME. WATER FREQUENCY DURING
WINTER RAIN SEASON MAY BE REDUCED UPON ACCEPTANCE OF ARCHITECT.
5.TREE PROTECTION FENCING SHALL BE "ORANGE PLASTIC SAFETY FENCING," 72" IN HEIGHT, TOP SECURED TO METAL
T-POSTS WITH 12-GAUGE WIRE WOVEN THROUGH TOP OF FENCING FOR ENTIRE LENGTH.
-HEAVY DUTY T-POSTS SHALL BE PLACED SO THAT WIRE & FENCE ARE TAUT.
-CHAIN LINK FENCING IS OPTIONAL.
6. TRUNK PROTECTION IS REQUIRED IF CONSTRUCTION OCCURS WITHIN TEN FEET OR LESS OF TRUNK. CONSTRUCTION INSIDE
CRITICAL ROOT ZONE IS ONLY PERMITTED WHEN EQUIPMENT IS OPERATED EXCLUSIVELY ON EXISTING HARDSCAPE,
AND NO SOIL COMPACTION TAKES PLACE.
DBH X 12"
OR AS APPROVED
METAL "T" POST
TRUNK PROTECTION
CRITICAL ROOT ZONE
DETAIL-FILE
2
TREE SPECIES DIVERSITY
PER CITY OF FORT COLLINS 3.2.1(D)3 PROPOSED PLAN MUST HAVE A SPECIES DIVERSITY OF (10-19 TREES > 50%, 20-39
TREES > 33%, 40-59 TREES > 25%, 60+ TREES > 15%). OF THE 71 TOTAL TREES SURVEYED AND PROPOSED ON SITE, NO
SPECIES MAY HAVE MORE THAN 11 QUANTITY.
*TYPE (PROPOSED & EXISTING TO REMAIN)COUNT 60+ TREES > 15%
Populus x acuminata 6 8
Populus Deltoides 6 8
Salix amygdaloides 4 6
Acer saccharum 'Bailsta'2 3
Tilia americana 'Boulevard'4 6
Ulmus davidiana 'Choice City'1 1
Juniperus scopulorum 9 13
Cottonwood (existing)14 20
Siberian Elm (existing)16 23
Boxelder (existing)7 10
Russian Olive (existing)1 1
White Poplar (existing)1 1
TOTAL TREES 71
*CITY OF FORT COLLINS CODE SECTION 3.2.1(D)3 MINIMUM SPECIES DIVERSITY
NATIVE SEED MIX NOTES
1.THE TIME OF YEAR SEEDING IS TO OCCUR SHOULD BE OCTOBER THROUGH EARLY MAY.
2.PREPARE SOIL AS NECESSARY AND APPROPRIATE FOR NATIVE SEED MIX SPECIES THROUGH AERATION AND
ADDITION OF AMENDMENTS, THEN SEED IN TWO DIRECTIONS TO DISTRIBUTE SEED EVENLY OVER ENTIRE
AREA. DRILL SEED ALL INDICATED AREAS AS SOON AS POSSIBLE AFTER COMPLETION OF GRADING
OPERATIONS.
3.IF CHANGES ARE TO BE MADE TO SEED MIX BASED ON SITE CONDITIONS THEN APPROVAL MUST BE
PROVIDED BY CITY ENVIRONMENTAL PLANNER
4.APPROPRIATE NATIVE SEEDING EQUIPMENT WILL BE USED (STANDARD TURF SEEDING EQUIPMENT OR
AGRICULTURE EQUIPMENT SHALL NOT BE USED).
5.DRILL SEED APPLICATION RECOMMENDED PER SPECIFIED APPLICATION RATE TO NO MORE THAN 1
2" DEPTH
(OR APPROPRIATE DEPTH FOR SELECTED SPECIES). FOR BROADCAST SEEDING INSTEAD OF DRILL SEEDING
METHOD DOUBLE SPECIFIED APPLICATION RATE. REFER TO NATIVE SEED MIX TABLE FOR SPECIES,
PERCENTAGES AND APPLICATION RATES.
6.PREPARE WEED MANAGEMENT PLAN TO ENSURE THAT WEEDS ARE PROPERLY MANAGED BEFORE, DURING
AND AFTER SEEDING ACTIVITIES.
7.AFTER SEEDING, THE AREA SHALL BE COVERED WITH CRIMPED STRAW, JUTE MESH, OR OTHER
APPROPRIATE METHODS. PLASTIC BASED EROSION CONTROL MATERIALS (I.E., PLATIC WELDED BLANKETS)
SHALL NOT BE USED WITHOUT EXPRESS PERMISSION FROM THE ENVIRONMENTAL PLANNER AS THESE
MATERIALS HAVE PROVED TO CAUSE WILDLIFE ENTRAPMENT ISSUES.
8.WHERE NEEDED, TEMPORARY IRRIGATION SHOULD BE PROVIDED UNTIL SEED IS ESTABLISHED. IF
IRRIGATION IS USED, THE IRRIGATION SYSTEM FOR SEEDED AREAS SHALL BE FULLY OPERATIONAL AT THE
TIME OF SEEDING AND SHALL ENSURE 100% HEAD-TO-HEAD COVERAGE OVER ALL SEEDED AREAS. ALL
METHODS AND REQUIREMENTS IN THE APPROVED IRRIGATION PLAN SHALL BE FOLLOWED.
9.CONTRACTOR SHALL MONITOR SEEDED AREA FOR PROPER IRRIGATION, EROSION CONTROL, GERMINATION
AN RE-SEEDING AS NEEDED TO ESTABLISH COVER.
10.THE APPROVED SEED MIX AREA IS INTENDED TO BE MAINTAINED IN A NATURAL LIKE LANDSCAPE
AESTHETIC. IF AND WHEN MOWING OCCURS IN NATIVE GRASS SEED MIX AREAS DO NOT MOW LOWER
THAN 6 TO 8 INCHES IN HEIGHT TO AVOID INHIBITING NATIVE PLANT GROWTH.
11.NATIVE SEED AREA WILL BE CONSIDERED ESTABLISHED WHEN SEVENTY PERCENT (70%) VEGETATIVE COVER
IS REACHED WITH NO LARGER THAN ONE FOOT SQUARE BARE SPOTS AND/OR UNTIL DEEMED ESTABLISHED
BY CITY PLANNING SERVICES AND EROSION CONTROL.
12.THE DEVELOPER AND/OR LANDSCAPE CONTRACTOR IS RESPONSIBLE FOR ADEQUATE SEEDLING COVERAGE
AND GROWTH AT THE TIME OF FINAL STABILIZATION, AS DEFINED BY STATE AND LOCAL AGENCIES. IF FINAL
STABILIZATION IS NOT ACHIEVED TO THE SATISFACTION OF THE AGENCY, THE DEVELOPER AND/OR
LANDSCAPE CONTRACTOR SHALL BE RESPONSIBLE FOR ADDITIONAL CORRECTIVE MEASURES TO SATISFY
FINAL VEGETATIVE REQUIREMENTS FOR CLOSEOUT.
PLANT SCHEDULE
HYDROZONE AREA (SF)WATER NEEDED
(GALLONS/SF)ANNUAL WATER USE (GALLONS)
HIGH 0 18 0
MODERATE 0.00 14 0.00
LOW 326902 8 2615216
VERY LOW 0.00 3 0.00
TOTAL 326,902 8.0000 2,615,216
ANNUAL WATER USE NOT TO EXCEED 15 GAL./SF. AVERAGE OVER THE SITE
WATER USE TABLE
HYDROZONE AREA (SF)WATER NEEDED
(GALLONS/SF)ANNUAL WATER USE (GALLONS)
HIGH 0 18 0
MODERATE 0.00 14 0.00
LOW 119963 8 959704
VERY LOW 0.00 3 0.00
TOTAL 119,963 8.0000 959,704
ANNUAL WATER USE NOT TO EXCEED 15 GAL./SF. AVERAGE OVER THE SITE
LOT 1
LOT 2
RESTORATION PLAN SUMMARY
1.0 INTRODUCTION
North College 1311, LLC has proposed the Mason Street Infrastructure development project (“site”) within 3 lots totaling
approximately 13.13 acres. The City of Fort Collins (City) has also proposed a future detention basin (“Hickory Pond”) within
portions of Lot 1 and 2 within the site. The site is located within parcels 9702100007 and 9702100918 and is situated between
Willox Lane and Hickory Street to the north/south, with Mason Street to the east and railroad to the west.
An Ecological Characterization Study (ECS) was performed in September 2022 as required by Article 3, Section 3.4.1 of the City
Land Use Code (LUC) (Cedar Creek 2023). The ECS informed the City's determination that the site contains Dry Creek and will
require the implementation of a Natural Habitat Buffer Zone (NHBZ) to mitigate potential impacts from development on
ecological character and quality.
The proposed Project Development Plan presents the NHBZ delineations on site in accordance with LUC guidelines. Approval of
the proposed NHBZ delineation is contingent upon the Applicant completing additional mitigation requirements prescribed by
the City's Environmental Planning Department.
This NHBZ Restoration and Annual Monitoring Plan (Plan) presents recommended restoration and monitoring approaches which
have been designed to ascertain measurable habitat improvement in the NHBZ. The objective of this Plan is to describe the
methods and procedures that will be used to implement restoration, assess establishment and progress of restoration, identify
potential issues, and gather information used to inform adaptive management activities. Weed management is discussed within
the broader context of our proposed approach in this document and detailed more specifically in a separate Weed Management
Plan (Cedar Creek 2024).
2.0 EXISTING SITE CONDITIONS
The site primarily consists of upland grassland, containing a mixture of native, invasive, and noxious species, dominated by
smooth brome (Bromus inermis ). Other species include leafy spurge (Euphorbia esula ), Canada thistle (Cirsium arvense ),
Western wheatgrass (Pascopyrum smithii ), orchard grass (Dactylis glomerata ), alfalfa (Medicago sativa ), and prickly lettuce
(Lactuca serriola ). Dry Creek traverses the site from the northwest to the southeast. Dry Creek appears to contain no active
surface hydrology and shows little signs of conveying ephemeral flow.
As such the Dry Creek riparian area is dominated by Siberian elm (Ulmus pumila ), crack willow (Salix fragilis ), and white poplar
(Populus alba ), with a herbaceous layer dominated by smooth brome. Other species include showy milkweed (Asclepias
speciosa ), horse tail (Equisetum sp .), rose (Rosa woodsii ), wild licorice (Glycyrrhiza lepidota ), and narrowleaf willow (Salix
exigua ). The southeast portion of Dry Creek (across Mason Street) is dominated by cottonwood (Populus deltoides ) and
contains no herbaceous layer. Dry Creek is listed as requiring a 100-foot NHBZ in Section 3.4.1 of the City LUC.
Given that Dry Creek has not exhibited flowing water for a long time, it is likely that existing vegetation is dependent on shallow
ground water. Therefore, the established trees and shrubs within the riparian zone likely will not need supplemental irrigation.
However, if additional plant materials are installed supplemental temporary irrigation is warranted.
3.0 RESTORATION PLAN
3.1 Goals and Objectives
In accordance with the City LUC 3.4.1 the NHBZ should be managed to:
1.Preserve or enhance the ecological character or function and wildlife use of the natural habitat or feature and to minimize or
adequately mitigate the foreseeable impacts of development.
2.Preserve or enhance the existence of wildlife movement corridors between natural habitats and features, both within and
adjacent to the site.
3.Enhance the natural ecological characteristics of the site. If existing landscaping within the NHBZ is determined by the
decision maker to be incompatible with the purposes of the buffer zone, then the applicant shall undertake restoration and
mitigation measures such as re-grading and/or the replanting of native vegetation.
4.Provide appropriate human access to natural habitats and features and their associated NHBZ'S in order to serve recreation
purposes, provided that such access is compatible with the ecological character or wildlife use of the natural habitat or
feature.
More specific goals have been established through meetings with the City. These general goals are:
1.Control weeds prior to construction throughout the site, including the Dry Creek riparian corridor.
2.Focus on the enhancement of the Dry Creek riparian corridor through potential direction of sheet flow of hydrology on site
within Dry Creek and additional herbaceous, shrub, and tree plantings.
3.The future Hickory Pond should resemble a naturalized wetland and shrub plantings around the fringe of the pond should be
included.
4.The remaining mitigation area should be established into a higher quality upland grassland than the existing habitat.
The restoration approach and monitoring presented in this Plan has been developed to support the meeting of NHBZ goals
through evaluation of revegetation establishment and progression. Monitoring results can be used to identify problem areas or
potential issues early in the restoration process, inform adaptive management activities (i.e., weed management), and assess
progress towards the meeting of success criteria indicative favorable NHBZ restoration and management.
3.2 Step-by-Step Approach
The following is a recommended step-by-step process designed to reduce cost, improve the ecological function, and enhance
the ecological characteristics of the NHBZ while maintaining flexibility for site-specific conditions.
Step 1. Creating Opportunity and Reducing Competition
Noxious and invasive species are often non-native, aggressive spreaders, that dominate an ecosystem and outcompete native
species. Establishing native species is important for restoration goals and to provide healthy, diverse, and sustainable
ecosystem. If noxious and invasive species are left unmanaged, opportunities for native species establishment are greatly
reduced. It is recommended some method of vegetation control must be utilized to control noxious and invasive species.
Vegetation control is implemented via mechanical or chemical controls. Mechanical control entails scraping or plowing to
increase bare ground exposure which will serve as a seedbed / planting medium. Chemical control entails the use of herbicide
to diminish dominance of undesirable and noxious species. Leafy spurge and Canada thistle the dominant noxious species on
the site (see Weed Management Plan; Cedar Creek 2024). The dominant invasive species within the site is smooth brome, an
aggressive, non-native, perennial and rhizomatous grass, spread by wind-driven cross-fertilization to produce seeds and
propagate vegetatively through tillering and root fragments. While smooth brome can negatively impact biodiversity, it does
provide excellent soil stability and forage potential for wildlife. Therefore, a total eradication of this species may not be
necessary, but a chemical treatment is highly recommended prior to initiating mechanical manipulation of soil, to reduce
competition and encourage the establishment of native vegetation.
Step 2. Grading
Current development plans propose filling in portions of Dry Creek, though a majority of the channel will remain intact. Grading
will be completed to ensure some surface water flows will continue to contribute to the remnant portions of Dry Creek. Grading
and design of the future Hickory Pond should follow the City's standards and guidelines (City of Fort Collins 2009 & 2018).
Step 3. Soil Preparation
The soil surface should be optimized for seeding or planting. An agronomic assessment is recommended to evaluate the
chemical and physical properties of the soil throughout the site, and a required design standard in the location of the proposed
Hickory Pond. This information can be used to determine whether soil amendments (i.e. compost) would benefit the
establishing plant communities and allow for optimization of the seed mix to soil conditions.
Planted areas in Hickory Pond will require topsoil with appropriate levels of organic matter and should receive imported or
stockpiled topsoil to a minimum depth of four inches. Sub-grade should be loosened to a depth of 12 inches total (8” existing
sub-grade and 4” of new topsoil) in Hickory Pond and 10 inches throughout the remainder of the site. Stones, clods, sticks,
rubbish, and other matter large enough to impede planting, seeding, or mowing should be collected and removed from the site.
Removed material must be disposed of legally.
Cultivation should be repeated in areas where equipment used for hauling and spreading topsoil has recompacted the soil.
Disturbed areas should be fine graded to a smooth, uniform surface plane. Prior to seeding, the soil surface should be loose,
allowing for good soil/seed contact. Roll and rake, remove ridges, and fill depressions to meet surface grades based on grading
plans.
Step 3. Seeding and Planting
Seeding and planting should occur as soon as possible following final construction and final contouring within a suitable time
frame. For seeding, late fall to early spring (October to May) is favorable, with late fall being priority for non-irrigated areas.
Woody plantings should occur in late fall (prior to frozen ground) or early spring (October to May) to increase survival success.
Woody planting being planted from containers should have the sides and bottom of the root system scarified. Live stakes should
be installed to ensure 70 to 80% of the entire live stake is underground.
The species used should be native and suitable to the soil and moisture conditions of the NHBZ. Seed mixes should be designed
to facilitate growth of appropriate and sustainable species. If changes are to be made to the proposed seed mix based on site
conditions, then approval must be provided by a city Environmental Planner. The proposed seed mixes are based on the City's
recommended species, site conditions, and the U.S. Army Corps of Engineers (USACE) Wetland Indicator Status Plant List for
the Great Plains Region (USACE 2020). The site contains a high-water table within areas, notably the Dry Creek area. A mixture
of upland, facultative-upland, facultative, facultative-wetland, and obligate species were selected to represent varying conditions
and slopes. Species were also selected to provide pollinator habitat, with emphasis on milkweed species for the U.S. Fish and
Wildlife Service (USFWS) federal listing candidate, the monarch butterfly (Danaus plexippus ). See Table 1 for a Proposed
Hickory Pond Seed Mix and Table 2 for Proposed Upland Grassland Seed Mix.
Seeding can be accomplished using broadcasting and drilling techniques wherever applicable.
·For broadcast seeding: the seeding rate should be doubled, seed-to soil contact should be increased immediately through
manipulation which will also provide some protection from wind or water erosion and granivores. Manipulation can be
accomplished by either a light disc harrowing perpendicular to the flow of energy (wind and/or water) or hand raking
around sensitive areas (i.e. willow patches).
·For drill seeding, final drilling pass must occur on the contour, to create subtle ridges perpendicular to the flow of energy.
Drill seeding should not be conducted in sensitive areas.
Appropriate native seeding equipment will be used, which does not include standard turf seeding equipment or agriculture
equipment. Drill seed the approved mix in two passes, each at a right angles to the other and using half the seed in each pass.
Seed should be drilled at the specified application rate and to a depth of no greater than ½ inch. If areas are too wet or steep
to drill seed, broadcast seed in opposite directions at twice the application rate used for drill seeding. Restore fine grade after
seeding, and cover seed to a depth of ¼ of an inch by raking or dragging. Firm seeded areas with a roller weighing a maximum
of 100 lbs. per foot of width.
Woody plantings of trees and shrubs along Dry Creek and the fringe of Hickory Pond are also proposed to provide structural
diversity and meet restoration goals. Species to be used should be approved by a City Environmental Planner. Woody plantings
should be planted using industry Best Management Practices.
The following native trees are recommended for planting:
·Cottonwood (Populus deltoides ). This species is present within portions of Dry Creek, except in areas where non-native or
noxious species such as Siberian elm and crack willow are present. Cottonwood should be planted along Dry Creek where
possible.
·Peachleaf willow (Salix amygdaloides ). This species may be planted along Dry Creek and along the fringe of Hickory Pond.
The following upland native shrubs are recommended for planting along the fringe of Hickory Pond or other upland areas:
·Rubber Rabbitbrush (Ericameria nauseosa var. nauseosa )
·Winterfat (Krascheninnikovia lanata )
·Broom snakeweed (Gutierrezia sarothrae )
·Fourwing Saltbush (Atriplex canescens )
·Snowberry (Symphoricarpos occidentalis )
The following mesic to wetland native shrubs are recommended for planting within Hickory Pond or along Dry Creek, where the
water table may be high and surface water may be present after rain events:
·Redosier dogwood (Cornus sericea)
·Coyote willow (Salix exigua )
·Waterbirch (Betula occidentalis )
·Wild black currant (Ribes americanum )
Plantings and/or plugs of wetland species is recommended in Hickory Pond or Dry Creek if inundation or saturation precludes
seeding. If necessary, these plantings should be concentrated in areas with high risk of erosion to minimize the risk of soil loss.
Planting should also be concentrated where favorable moisture zones are likely to exist. Planting small plugs in the fall is not
desirable due to the loss of plants to Canada geese (Branta canadensis ). Subsequent plantings are recommended after initial
establishment and when weeds are controlled (2-5 growing seasons after initial construction). These plantings can be
concentrated in areas needing additional erosion control protection and/or bare areas. Supplemental temporary irrigation should
be used to aid in establishing newly installed plant materials.
Step 4. Maintenance and Management
Maintenance and management activities should be implemented to ensure success of the ecological restoration project. After
seeding, the area shall be covered with crimped straw, jute mesh, or other appropriate soil surface stabilization methods. Straw
mulch should be certified weed-free hay or certified weed-free straw with no seed heads. In the stormwater drainage area,
natural fiber blankets are recommended, as synthetic blankets can entangle reptiles and amphibians in aquatic habitats. Routine
inspections for erosion should be performed during the time between seeding and vegetation establishment to assure no
excessive erosion features form on the project area.
Restoration goals can be achieved without the use of supplemental water if planting plans correspond to local climatic patterns
for native seeding, late fall or early spring. Supplemental irrigation can have substantial effects on the trajectory of the
establishing plant community that can negatively affect site diversity and self-sustainability (USFS 1984). For example,
supplemental water can negate important site characteristics such as micro-topographic features, while also providing a
competitive advantage to sod-forming or more quickly growing species, leading to decreased structural diversity throughout the
site. Species proposed in this restoration plan are native species which are adapted to local climatic conditions and should be
able to establish under natural conditions. By not applying supplemental water, the development of a more diverse, drought
tolerant, and ultimately more resilient and sustainable ecosystem will be allowed to establish at the site.
The Weed Management Plan (Cedar Creek 2024) provided for the site will be implemented to ensure that weeds are properly
managed before, during, and after seeding activities. Overall, the contractor shall monitor seeded area for erosion control,
germination, and reseeding as needed to establish cover.
4.0 ANNUAL MONITORING PLAN
The applicant will be responsible for ensuring execution of the monitoring and reporting protocol described below.
4.1 Schedule
The NHBZ will be surveyed twice a year on the following schedule:
1.In the spring, a qualified ecologist will traverse the entirety of the site to assess noxious weed populations prior to
implementation of management strategies. This effort will result in optimized and targeted weed control efforts and provide
sufficient time to manage weeds prior to seed production.
2.At the peak of growing season, a qualified ecologist will implement the quantitative procedure described in section 4.2 to
measure ground cover within the NHBZ. The ecologist will also traverse the entirety of the site to identify potential problems
or issues with restoration. During these traverses, the observer will take note of areas of poor seedling emergence,
indicators of soil fertility problems, noxious weeds or invasive plant infestation, expectations for noxious weed
seeding/flowering, excessive erosion, and any other similar revegetation / restoration related issues (if observed).
Annual monitoring will continue for a total of three years following restoration of the NHBZ. A brief memo containing survey
findings and recommendations will be provided to the City by September 30th of each year. This will give the City and the
applicant ample time to discuss and implement adaptive management to address any underperforming areas prior to when
on-the-ground treatment implementation would be needed, if determined necessary.
4.2 Permanent Photo-points
Eight permanent photo-points (marked with GPS coordinates) on the site will be established to visually catalog vegetation
progress, including, 4 along the Dry Creek riparian corridor, 2 within Hickory Pond, and 2 within surrounding upland grassland
area. Photo-points should be determined in the field at a location representative of the NHBZ area, each location marked with
GPS coordinates, and each designated with a number which will remain consistent throughout the 3-year monitoring period.
Each photo-point should be documented during the summer evaluation at the peak of the growing season, for each of the
annual monitoring efforts that will follow restoration. At each point, four photos will be collected, one each in a cardinal
compass direction (N-E-S-W), using a photo board that is visible in each frame to indicate the photo-point number.
4.3 Sampling Methodology
Cover sampling will be conducted at a minimum of 15 sample points in the reclaimed areas of the NHBZ to assess progress
towards standards. A minimum of 5 sample points each should be located in the Dry Creek riparian corridor and within Hickory
Pond (10 total).
At each sample point, ground cover will be measured using ocular estimates in a 1 meter by 1 meter quadrat. Sample locations
will be determined randomly prior to field evaluation. Upon reaching the sample point, the quadrat will be placed on the ground
and the ecologist will estimate and record vegetative ground cover by species to the nearest 1%. All species, including noxious
and invasive species, and their respective percent ground cover will be recorded. In addition, percent cover of litter, rock, and
bare ground exposure will be estimated and recorded; when summed with vegetation estimates, these will produce 100%
coverage of ground cover at each sample point.
4.4 Success Criteria
During the third year of annual monitoring, a determination of successful establishment in the NHBZ will be made by the City
Environmental Planning Department based on site surveys and vegetative performance compared to success criteria. The
developer and/or landscape contractor is responsible for adequate seedling coverage and growth at the time of final
stabilization, as defined by state and local agencies. Restored vegetation communities will be considered established when an
effort to achieve the NHBZ goals has been demonstrated through mitigation and/or reclamation efforts and all of the following
are met:
1.70% total vegetative cover (excluding noxious weeds) is reached with no bare spots larger than one square-foot, except in
areas that receive consistent seasonal flow or standing water.
2.Noxious weeds do not exceed 10% total cover.
3.The site is deemed acceptable by the City Environmental Planning Department and Utility Services Department.
The City Environmental Planning Department has the authority to deem revegetation established in lieu of meeting success
criteria, as well as withhold approval despite meeting success criteria, if they so choose. If final stabilization is not achieved to
the satisfaction of the agency, the developer and/or landscape contractor shall be responsible for additional corrective measures
to satisfy final vegetative requirements for closeout.
DRAWING NUMBER:
ISSUED
PROJECT No.:
DRAWN BY:
REVIEWED BY:
SEAL:
PREPARED BY:
No.DESCRIPTION DATE
REVISIONS
No.DESCRIPTION DATE
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419 Canyon Ave. Suite 200 Fort Collins, CO 80521
phone 970.224.5828 | fax 970.225.6657 | www.ripleydesigninc.com
RIPLEY DESIGN INC.
Klara Rossouw
419 Canyon Ave. Suite 200
Fort Collins, CO 80521
p. 970.224.5828
NORTH COLLEGE 1311, LLC
262 E. Mountain Ave.
Fort Collins, CO 80524
p. 970.490.2626
ENGINEER
LAND PLANNER
NORTHERN ENGINEERING
Blaine Mathisen
301 N Howes St, Suite 100
Fort Collins, CO 80521
p. 970.221.4158
OWNER
RESTORATION PLAN
SUMMARY
PDP/FDP SUBMITTAL
MASON STREET
INFRASTRUCTURE
5
4
PDP/FDP RD 5
PDP/FDP RD 4
03/12/2024
01/31/2024
12/20/2023PDP/FDP RD 33
10/4/2023PDP RD 22
5/24/2023PDP RD 11
FORT COLLINS, CO
KR
LO
R23-008
L2.01
SEED MIXES
UPLAND NATIVE SEED MIX
COMMON NAME SCIENTIFIC NAME PLS*/LB.LBS/PLS/
ACRE PLS/FT²PERCENT
OF MIX
WILDLOWERS/FORBS
SHOWY MILKWEED ASCLEPIAS SPECIOSA 72,000 4.2 6.9 9%
PLAINS COREOPSIS COREOPSIS TINCTORIA 1,400,000 0.17 5.5 7%
PURPLE PRAIRIE CLOVER DALEA PURPUREA 210,000 0.81 3.9 5%
INDIAN BLANKETFLOWER GAILLARDIA ARISTATA 132,000 1.85 5.6 7%
ROCKY MOUNTAIN
PENSTEMON PENSTEMON STRICTUS 592,000 0.35 4.8 6%
MEXICAN HAT RATIBIDA COLUMNIFERA 737,000 0.20 3.4 4%
FORB SUBTOTAL 7.60 30.1 40%
GRASSES
INDIAN RICEGRASS ACHNATHERUM HYMENOIDES 141,000 1.13 3.7 5%
SIDEOATS GRAMA BOUTELOUA CURTIPENDULA 191,000 1.15 5.0 7%
BUFFALOGRASS BOUTELOUA DACTYLOIDES 56,000 3.27 4.2 6%
BLUE GRAMA BOUTELOUA GRACILIS 825,000 0.25 4.7 6%
BOTTLEBRUSH SQUIRRELTAIL ELYMUS ELYMOIDES 192,000 0.95 4.2 6%
PRAIRIE JUNEGRASS KOELERIA MACRANTHA 2,315,400 0.08 4.3 6%
GREEN NEEDLEGRASS NASSELLA VIRIDULA 181,000 1.01 4.2 6%
SWITCHGRASS PANICUM VIRGATUM 389,000 0.71 6.3 8%
WESTERN WHEATGRASS PASCOPYRUM SMITHII 110,000 1.61 4.1 5%
SAND DROPSEED SPOROBOLUS CRYPTANDRUS 5,298,000 0.04 4.9 6%
GRASSES SUBTOTAL 10.20 45.5 60%
SEED MIX TOTALS 17.80 75.6 100%
ACCEPTABLE SUBSTITUTES PLS/LB.LBS/PLS/
ACRE PLS/FT²
FORBS
FRINGED SAGE ARTEMISIA FRIGIDA 4,536,000 0.20 20.8
BLUE FLAX LINUM LEWISII 293,000 0.80 5.4
PRAIRIE ASTER MACHAERANTHERA TANACETIFOLIA 108,000 0.60 1.5
GRASSES
CANADA WILDRYE ELYMUS CANADENSIS 115,000 10.40 27.5
INLAND SALTGRASS DISTICHLIS SPICATA 520,000 1.20 14.3
MOUNTAIN MUHLY MUHLENBERGIA MONTANA 1,500,000 2.00 68.9
ALKALI SACATON SPOROBOLUS AIROIDES 1,750,000 1.00 40.2
* PLS = PURE LIVE SEED. ALL MATERIALS FURNISHED SHALL BE FREE OF COLORADO STATE NOXIOUS WEEDS AS DEFINED IN ARTICLE III, SECTION
21-40 OF THE CODE OF THE CITY OF FORT COLLINS. THIS MIX IS BASED ON DRILL SEED APPLICATION. IF BROADCAST AND HARROW METHODS ARE
USED, RATES SHOULD BE DOUBLED. IF HYDROSEEDING OCCURS, SEED MUST NOT BE MIXED WITH A MULCH FOR APPLICATION. THEY MUST BE
APPLIED IN TWO PASSES: FIRST PASS SEED, SECOND PASS MULCH.
DETENTION SEED MIX
COMMON NAME SCIENTIFIC NAME PLS*/LB.LBS/PLS/
ACRE PLS/FT²PERCENT
OF MIX
WILDLOWERS/FORBS
PLAINS COREOPSIS COREOPSIS TINCTORIA 1,400,000 0.17 5.5 4.5%
WHITE PRAIRIE CLOVER DALEA CANDIDA 210,000 0.65 3.1 2.6%
SWAMP MILKWEED ASCLEPIAS INCARNATA 153,000 1.00 3.5 2.9%
SHOWY MILKWEED ASCLEPIAS SPECIOSA 72,000 1.00 1.7 1.4%
BLUE VERVAIN VERBENA HASTATA 1,792,800 0.40 16.5 13.5%
FORB SUBTOTAL 3.20 30.2 25%
GRASSES
PRAIRIE CORDGRASS SPARTINA PECTINATA 197,000 1.00 4.5 3.7%
SWITCHGRASS PANICUM VIRGATUM 389,000 1.50 13.4 11.0%
FOWL BLUEGRASS POA PALUSTRIS 3,156,000 0.35 25.4 20.8%
BUFFALOGRASS BOUTELOUA DACTYLOIDES 56,000 3.27 4.2 3.4%
BLUE GRAMA BOUTELOUA GRACILIS 825,000 0.25 4.7 3.9%
INLAND SALTGRASS DISTICHLIS SPICATA 520,000 0.35 4.2 3.4%
BOTTLEBRUSH SQUIRRELTAIL ELYMUS ELYMOIDES 192,000 0.95 4.2 3.4%
STREAMBANK WHEATGRASS ALYMUS LANCEOLATUS SSP.
LANCEOLATUS 156,000 1.36 4.9 4.0%
LITTLE BLUESTEM SCHIZACHYRIUM SCOPARIUM 260,000 0.70 4.2 3.4%
NEBRASKA SEDGE CAREX NEBRASCENSIS 534,100 0.40 4.9 4.0%
THREE SQUARE BULRUSH SCHOENOPLECTUS PUNGENS 300,000 0.70 4.8 3.9%
ARCTIC RUSH JUNCUS BALTICUS 10,900,000 0.05 12.5 10.2%
GRASSES SUBTOTAL 10.90 91.9 75%
SEED MIX TOTALS 14.10 122.1 100%
ACCEPTABLE SUBSTITUTES PLS/LB.LBS/PLS/
ACRE PLS/FT²
FORBS
BLUE FLAX LINUM LEWISII 170,000 0.83 3.2
BLACK-EYED SUSAN RUDBECKIA HIRTA 1,710,000 0.14 5.5
MARSH SUNFLOWER HELIANTHUS NUTTALLII 125,000 1.50 4.3
GRASSES
SALT AND PEPPER GRASS DESCHAMPSIA CAESPITOSA 1,300,000 0.07 2.1
WATER SEDGE CAREX AQUATILLIS 485,000 0.30 3.3
SLENDER WHEATGRASS ELYMUS TRACHYCAULUS 159,000 1.36 5.0
* PLS = PURE LIVE SEED. ALL MATERIALS FURNISHED SHALL BE FREE OF COLORADO STATE NOXIOUS WEEDS AS DEFINED IN ARTICLE III, SECTION
21-40 OF THE CODE OF THE CITY OF FORT COLLINS. THIS MIX IS BASED ON DRILL SEED APPLICATION. IF BROADCAST AND HARROW METHODS ARE
USED, RATES SHOULD BE DOUBLED. IF HYDROSEEDING OCCURS, SEED MUST NOT BE MIXED WITH A MULCH FOR APPLICATION. THEY MUST BE
APPLIED IN TWO PASSES: FIRST PASS SEED, SECOND PASS MULCH.
8" W
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(
7
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'
R
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)
HIBDON COURT
(45' R.O.W.)
LOT 1
(7.790 AC)
ZONING: C-S
FUTURE CITY OF FORT COLLINS
REGIONAL DETENTION
LOT 2
(2.772 AC)
ZONING: C-S
LOT 3
(1.321 AC)
ZONING: C-S
EXISTING BUSINESSES
ZONING: C-S
EXISTING MOBILE HOME PARK
ZONING: C-S
TRACT A
(.245 AC)
DU&AE
HYDRANT, TYP.
R.O.W. TYP
EXISTING FENCE
DRY CREEK TOP
OF BANK
NHBZ BUFFER
AREA BOUNDARY
PROJECT BOUNDARY
PROJECT BOUNDARY
8'-0" TREE LAWN
6'-0" WALK
9'-0" U.E.
9'-0" U.E.
71'-0"
10'-0" U.E.
10'-0" U.E.
6'-0" U.E.
EXISTING 20'-0" WATERLINE ALIGNMENT
8'-0" TREE LAWN
6'-0" WALK
9'-0" U.E.
20'-0" EMERGENCY
ACCESS EASEMENTDRAINAGE
EASEMENT
30'-0" UTILITY & STORMWATER
EASEMENT
60'-0" DRAINAGE EASEMENT
20'-0" WATERLINE & ROW EASEMENT
10'-0" UTILITY ALIGNMENT
EXISTING 6'-0" UTILITY ALIGNMENT
ACCESS EASEMENT
10'-0" UTILITY ALIGNMENT
20'-0" DRAINAGE
EASEMENT
20'-0" DRAINAGE
EASEMENT
10'-0" U.E.
3' POWER LINE EASEMENT
TO BE VACATED BY
SEPARATE DOCUMENT
RAILROAD R.O.W.
AGREEMENT TO
BE VACATED
ENCROACHMENT EASEMENT
BY SEPARATE DOCUMENT
6'-0" U.E.
16' R.O.W. EASEMENT
10'-0" U.E.
3' POWER LINE EASEMENT
53'-6" PERPETUAL
EASEMENT FOR ELECTRIC
POWER TRANSMISSION LINE
20'-0" U.E.
30'-0" R.O.W. EASEMENT
10'-0" PSC GAS
EASEMENT
20'-0" U.E.
20'-0"
DRAINAGE
EASEMENT
FO FO
G G
SS SS
T T
UE UE
W W
FIBER OPTIC UTILITY
GAS UTILITY
STORM DRAIN UTILITY
SANITARY SEWER UTILITY
TELEPHONE UTILITY
UNDERGROUND ELECTRIC UTILITY
WATER LINE UTILITY
LOT LINES
SYMBOL DESCRIPTION
VAULT
ELEC
T
G
ELEC
EXISITING TREES TO REMAIN (SEE
INVENTORY AND MITIGATION PLAN,
SHEET L4.00)
STREET LIGHT
FIRE HYDRANT
TRANSFORMER
ELECTRIC BOX
ELECTRIC VAULT
TELEPHONE PEDESTAL
EXISTING SIGN
INLET GRATE
GAS METER
x x EXISTING FENCE
PROPOSED FENCE
LEGEND
NOTE: UTILITIES SHOWN FOR REFERENCE ONLY
TOP OF BANK
PROPERTY BOUNDARY
PROPOSED NHBZ MITIGATION
UTILITY EASEMENTU.E.
SYMBOL CODE QTY BOTANICAL / COMMON NAME CONT CAL
CANOPY NATIVE TREE
PDM 6 POPULUS DELTOIDES MONILIFERA
PLAINS COTTONWOOD B & B 2"CAL
PAC 6 POPULUS X ACUMINATA
LANCELEAF COTTONWOOD B & B 2"CAL
SAM 4 SALIX AMYGDALOIDES
PEACH LEAF WILLOW B & B 2"CAL
CANOPY TREES
ASB 2 ACER SACCHARUM 'BAILSTA'
FALL FIESTA® SUGAR MAPLE B & B 2"CAL
TCG 4 TILIA CORDATA 'GLENLEVEN'
GLENLEVEN LITTLELEAF LINDEN B & B 2"CAL
UDC 1 ULMUS DAVIDIANA 'CHOICE CITY'
CHOICE CITY DAVID ELM B & B 2"CAL
EVERGREEN NATIVE TREE
JSC 9 JUNIPERUS SCOPULORUM
ROCKY MOUNTAIN JUNIPER B & B 8` HT
1. ALL LANDSCAPE IMPROVEMENTS WITHIN THE RIGHT-OF-WAY SHALL BE INSTALLED
WHEN SUBSEQUENT LOT IS DEVELOPED AND WILL BE THE RESPONSIBILITY OF THE
RESPECTIVE DEVELOPER. TREE LOCATIONS, SPECIES, AND TREE LAWN SHOWN FOR
REFERENCE ONLY. SPECIES AND LAYOUT ARE SUBJECT TO CHANGE DEPENDENT ON
LOT ACCESS POINTS. ESCROW TO BE PROVIDED FOR IMPROVEMENTS BUILT WITH
THIS PROPOSAL.
2. ANY IMPACTS TO THE REQUIRED NATURAL HABITAT BUFFER AREA SHALL BE
MITIGATED FOR ON LOT 1. EXTENTS OF MITIGATION TO BE DETERMINED AT THE TIME
OF FUTURE PROPOSAL FOR LOT 2.
3.THE OFF-SITE NATURAL HABITAT BUFFER ZONE (NHBZ) MITIGATION LOCATED ON
SYMBOL DESCRIPTION DETAIL
HYDROZONE - HIGH (TURF)2,103 SF
HYDROZONE - LOW (NATIVE SEED)446,865 SF
IRRIGATED TURF
ROCK MULCH
UPLAND NATIVE SEED MIX
DETENTION SEED MIX
GRAVEL ROAD, RE: CIVIL 14,260 SF
NOTE: UTILITIES SHOWN FOR REFERENCE ONLY
DRAWING NUMBER:
ISSUED
PROJECT No.:
DRAWN BY:
REVIEWED BY:
SEAL:
PREPARED BY:
No.DESCRIPTION DATE
REVISIONS
No.DESCRIPTION DATE
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419 Canyon Ave. Suite 200 Fort Collins, CO 80521
phone 970.224.5828 | fax 970.225.6657 | www.ripleydesigninc.com
RIPLEY DESIGN INC.
Klara Rossouw
419 Canyon Ave. Suite 200
Fort Collins, CO 80521
p. 970.224.5828
NORTH COLLEGE 1311, LLC
262 E. Mountain Ave.
Fort Collins, CO 80524
p. 970.490.2626
ENGINEER
LAND PLANNER
NORTHERN ENGINEERING
Blaine Mathisen
301 N Howes St, Suite 100
Fort Collins, CO 80521
p. 970.221.4158
OWNER
HYDROZONE PLAN
PDP/FDP SUBMITTAL
MASON STREET
INFRASTRUCTURE
5
4
PDP/FDP RD 5
PDP/FDP RD 4
03/12/2024
01/31/2024
12/20/2023PDP/FDP RD 33
10/4/2023PDP RD 22
5/24/2023PDP RD 11
FORT COLLINS, CO
KR
LO
R23-008
L3.00
NORTH
0 25 50 100
SCALE: 1"=50'-0"
A PERMIT MUST BE OBTAINED FROM THE CITY FORESTER BEFORE ANY TREES OR
SHRUBS AS NOTED ON THIS PLAN ARE PLANTED, PRUNED OR REMOVED IN THE
PUBLIC RIGHT-OF-WAY. THIS INCLUDES ZONES BETWEEN THE SIDEWALK AND CURB,
MEDIANS AND OTHER CITY PROPERTY. THIS PERMIT SHALL APPROVE THE LOCATION
AND SPECIES TO BE PLANTED. FAILURE TO OBTAIN THIS PERMIT IS A VIOLATION OF
THE CITY OF FORT COLLINS CODE SUBJECT TO CITATION (SECTION 27-31) AND MAY
ALSO RESULT IN REPLACING OR RELOCATING TREES AND A HOLD ON CERTIFICATE
OF OCCUPANCY.
PLANT SCHEDULE
TREE MITIGATION LEGEND
EXISTING TREES TO
SAVE IN PLACE
XXX XXX
EXISTING TO BE REMOVED
#TYPE STEMS DBH CONDITION
FORESTRY TREE
MITIGATION REMOVE? (Y/N)REASON FOR REMOVAL/ NOTES
1 COTTONWOOD 2 29, 34 FAIR-3.5 Y
2 COTTONWOOD 2 38, 35 FAIR-3.5 Y
3 SIBERIAN ELM 4 4-6 FAIR 1.5 Y
4 SIBERIAN ELM CLOUD 2-25 FAIR-4 Y
5 SIBERIAN ELM CLOUD 6-12 FAIR 3 Y
6 SIBERIAN ELM 1 7 FAIR 0 Y
7 SIBERIAN ELM 3 3-10 FAIR 1.5 Y
8 BOXELDER 1 9 FAIR 1.5 Y
9 WILLOW/BOXELDER CLOUD 7-16 FAIR-4.5 Y
10 RUSSIAN OLIVE 2 12, 12 FAIR 2.5 Y
11 BOXELDER 22 3-12 FAIR 4.5 Y
12 BOXELDER 2 14, 14 FAIR-2.5 N
13 BOXELDER 10 6-11 FAIR-3 N
14 WHITE POPLAR MULTI DEAD 0 N
15 BOXELDER 11 2-8 FAIR-2.5 N
16 SIBERIAN ELM 1 33 FAIR-3 N
17 SIBERIAN ELM 1 32 FAIR-3 N
18 SIBERIAN ELM 1 35 FAIR-3 Y
19 SIBERIAN ELM 1 18 FAIR-2 N
20 SIBERIAN ELM 1 8 FAIR 0 N
21 SIBERIAN ELM 1 10 FAIR-0 N
22 COTTONWOOD 3 12-26 FAIR-3.5 N
23 COTTONWOOD 5 15-31 FAIR 5 N
24 SIBERIAN ELM 1 12 FAIR-1.5 N
25 COTTONWOOD 1 21 FAIR-2.5 N
26 COTTONWOOD 2 16, 19 FAIR-2.5 N
27 COTTONWOOD 1 18 DEAD 0 N
28 COTTONWOOD 2 11-20 FAIR-3 N
29 SIBERIAN ELM 1 20 POOR 2 N
30 COTTONWOOD 1 31 FAIR-3.5 N
31 COTTONWOOD 1 18 FAIR 2.5 N
32 COTTONWOOD 1 12 POOR 1.5 N
33 COTTONWOOD 3 20-39 FAIR-5 N
34 COTTONWOOD 1 37 FAIR 4 N
35 SIBERIAN ELM 1 22 POOR 2.5 N
36 SIBERIAN ELM 1 14 POOR 2 N
37 COTTONWOOD 3 20-35 FAIR 3 N
38 SIBERIAN ELM 38 1-20 FAIR-4 Y
39 BOXELDER 21 2-12 DEAD 0 Y
40 WHITE POPLAR 1 20 FAIR 3 N
41 BOXELDER 3 15-21 FAIR-3 N
TOTAL MITIGATION
REQUIRED:37.0
X
X
X
X
X
X
X
X X
S
T
S
T
S
T
S
T
S
T
S
ELEC
F E S
M VAULT
ELEC
VAULT
ELEC
VAULT
ELEC
CABLE
CABLE ELEC
CTV CTV CTV
OH
U
OH
U
OH
U
OH
U
X
X X
X
X
CT
V
CT
V
CT
V
CT
V
CTV
CT
V
CTV CTV CTV
OHU OHU
X X
X X X X X X X
X
X
X
X
X
CTV CTV CTV
CT
V
CTV CTV
CT
V
CTV CTV
G G
G G G G G G
SS SS SS SS SS SS
SS
SS
SS
SS
SS
SS
H2O
H2O
A RV
H2O H2O
HYD
S
F E
S
F E S
W W W W W W W W W W W W W W W W W W W
XXXXXXXXXXXXX
OHU OHU OHU OHU OHU
X
X
X
X
X
X
X
X
X
X
W W W W
S
S
SS
SS
SS
SS
SS
SS
SS
D
X
X
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SS
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E E E E E E E E E E E E E E E E E E
E
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G
G
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UD
UD
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UD
UD
UD
UD
UD
12
"
S
S
12
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S
S
12
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S
S
1
2
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S
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1
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S
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1
2
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8"
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8
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8
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8
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8
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8
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8
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8
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8
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8"
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#1
#2
#3
#4
#5
#6
#7
#8
#9
#10
#11
#12
#14
#13
#15
#16 #17 #18
HYDRANT, TYP.
M
A
S
O
N
S
T
R
E
E
T
(
7
1
'
R
.
O
.
W
.
)
HIBDON COURT
MA
S
O
N
S
T
R
E
E
T
(7
1
'
R
.
O
.
W
.
)
LOT 1
(7.01 AC)
ZONING: C-S
FUTURE CITY OF FORT COLLINS
REGIONAL DETENTION
LOT 2
(3.91 AC)
ZONING: C-S
LOT 3
(1.29 AC)
ZONING: C-S
EXISTING BUSINESSES
ZONING: C-S
EXISTING MOBILE HOME PARK
ZONING: C-S
#19
#20
#21
#22
#23
#24
#25
#26
#27
#28
#29
#30
#31
#32
#33
#38
#37
#34
#35
#36
#39
#41
#40
FO FO
G G
SS SS
T T
UE UE
W W
FIBER OPTIC UTILITY
GAS UTILITY
STORM DRAIN UTILITY
SANITARY SEWER UTILITY
TELEPHONE UTILITY
UNDERGROUND ELECTRIC UTILITY
WATER LINE UTILITY
LOT LINES
SYMBOL DESCRIPTION
VAULT
ELEC
T
G
ELEC
STREET LIGHT
FIRE HYDRANT
TRANSFORMER
ELECTRIC BOX
ELECTRIC VAULT
TELEPHONE PEDESTAL
EXISTING SIGN
INLET GRATE
GAS METER
x x EXISTING FENCE
PROPOSED FENCE
NOTE: UTILITIES SHOWN FOR REFERENCE ONLY
TOP OF BANK
PROPERTY BOUNDARY
PROPOSED NHBZ MITIGATION
DRAWING NUMBER:
ISSUED
PROJECT No.:
DRAWN BY:
REVIEWED BY:
SEAL:
PREPARED BY:
No.DESCRIPTION DATE
REVISIONS
No.DESCRIPTION DATE
Pl
o
t
t
e
d
B
y
:
Li
n
d
s
a
y
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l
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v
e
r
La
y
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t
:
TR
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E
M
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T
I
G
A
T
I
O
N
Pr
i
n
t
e
d
O
n
:
3/
1
2
/
2
0
2
4
9
:
0
6
A
M
Fi
l
e
N
a
m
e
:
TR
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E
M
I
T
I
G
A
T
I
O
N
.
d
w
g
ORIGINAL SIZE 24X36
ENT
I
T
L
E
M
E
N
T
DRA
W
I
N
G
S
NOT
F
O
R
CON
S
T
R
U
C
T
I
O
N
419 Canyon Ave. Suite 200 Fort Collins, CO 80521
phone 970.224.5828 | fax 970.225.6657 | www.ripleydesigninc.com
RIPLEY DESIGN INC.
Klara Rossouw
419 Canyon Ave. Suite 200
Fort Collins, CO 80521
p. 970.224.5828
NORTH COLLEGE 1311, LLC
262 E. Mountain Ave.
Fort Collins, CO 80524
p. 970.490.2626
ENGINEER
LAND PLANNER
NORTHERN ENGINEERING
Blaine Mathisen
301 N Howes St, Suite 100
Fort Collins, CO 80521
p. 970.221.4158
OWNER
TREE MITIGATION
PDP/FDP SUBMITTAL
MASON STREET
INFRASTRUCTURE
5
4
PDP/FDP RD 5
PDP/FDP RD 4
03/12/2024
01/31/2024
12/20/2023PDP/FDP RD 33
10/4/2023PDP RD 22
5/24/2023PDP RD 11
FORT COLLINS, CO
KR
LO
R23-008
L4.00
NORTH
0 25 50 100
SCALE: 1"=50'-0"
TREE MITIGATION SUMMARY TABLE
MITIGATION TREES
REQUIRED
MITIGATION TREES
PROVIDED FEE IN LIEU PROVIDED
37 25 FEE IN LIEU PROVIDED FOR 12
TREES
NOTE: MITIGATION TREES ARE WITHIN THE NHBZ PLANTING, SEE SHEET L1.03
LEGEND
S
E
E
E
E
E
E
E E E E E E E E E E E E E E E
E
E
E
E
E
E
E
E
E
E
E
E
G
G
G
G
G
G
G
G
G
I
UDUDUDUDUDUD
UD
U
D
U
D
UD
UD
UD
UD
UD
8
"
W
8
"
W
8" W
8
"
W
8
"
W
8
"
W
8
"
W
8
"
W
8
"
W
8"
W
8"
W
E
EEEE
E
T
F
W
F
X
X
X
S
T
S
T
S
T
S
T
ELEC
F ES
M VAULT
ELEC
CABLE ELEC
CTV
OH
U
OH
U
OH
U
X X
CT
V
CT
V
CT
V
CT
V
CTVCTVCTV
OHU OHU
X X
X X X X X X
X
X
X
X
CTV CTVCTVCTVCTVCTV
G G G G G G G
SS SS SS SS SS
H2O
H2O
A RV
H2O H2O
H YD
S
F E
S
F E S
W W W W W W W W W W W W W W W
XXXXXXXXXX
OHU OHU
X
X
X
X
X
X
X
X
W W W
D
W W
SS
S
S
W
W
DRY CREEK TOP
OF BANK
LOT 2 BOUNDARY
DRY CREEK TOP
OF BANK
HIBDON COURT
EXISTING MOBILE HOME PARK
ZONING: C-S
LOT 2
(2.645 AC)
ZONING: C-S
LOT 1
(8.112 AC)
ZONING: C-S
FUTURE CITY OF FORT COLLINS
REGIONAL DETENTION
LOT 3
(1.293 AC)
ZONING: C-S
M
A
S
O
N
S
T
R
E
E
T
100'-0" TYP.
100'-0" TYP.
EXISTING NHBZ AREA 164,420 SF
AREA TO BE MITIGATED 76,484 SF
NHBZ MITIGATION 77,013 SF
S
E
E
E
E
E
E
E E E E E E E E E E E E E E E
E
E
E
E
E
E
E
E
E
E
E
E
G
G
G
G
G
G
G
G
G
I
UDUDUDUDUDUD
UD
U
D
U
D
UD
UD
UD
UD
UD
8
"
W
8
"
W
8" W
8
"
W
8
"
W
8
"
W
8
"
W
8
"
W
8
"
W
8"
W
8"
W
E
EEEE
E
T
F
W
F
X
X
X
S
T
S
T
S
T
S
T
ELEC
F ES
M VAULT
ELEC
CABLE ELEC
CTV
OH
U
OH
U
OH
U
X X
CT
V
CT
V
CT
V
CT
V
CTVCTVCTV
OHU OHU
X X
X X X X X X
X
X
X
X
CTV CTVCTVCTVCTVCTV
G G G G G G G
SS SS SS SS SS
H2O
H2O
A RV
H2O H2O
H YD
S
F E S
F E
S
W W W W W W W W W W W W W W W
XXXXXXXXXX
OHU OHU
X
X
X
X
X
X
X
X
W W W
D
W W
SS
S
S
W
W
DRY CREEK TOP
OF BANK
LOT 2 BOUNDARY
DRY CREEK TOP
OF BANK
HIBDON COURT
EXISTING MOBILE HOME PARK
ZONING: C-S
LOT 2
(2.645 AC)
ZONING: C-S
LOT 1
(8.112 AC)
ZONING: C-S
FUTURE CITY OF FORT COLLINS
REGIONAL DETENTION
LOT 3
(1.293 AC)
ZONING: C-S
M
A
S
O
N
S
T
R
E
E
T
DRAWING NUMBER:
ISSUED
PROJECT No.:
DRAWN BY:
REVIEWED BY:
SEAL:
PREPARED BY:
No.DESCRIPTION DATE
REVISIONS
No.DESCRIPTION DATE
Pl
o
t
t
e
d
B
y
:
Li
n
d
s
a
y
O
l
i
v
e
r
La
y
o
u
t
:
L4
.
0
0
N
A
T
U
R
A
L
H
A
B
I
T
A
T
B
U
F
F
E
R
Z
O
N
E
Pr
i
n
t
e
d
O
n
:
3/
1
2
/
2
0
2
4
9
:
0
6
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M
Fi
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N
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m
e
:
L4
.
0
0
N
A
T
U
R
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H
A
B
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T
A
T
B
U
F
F
E
R
Z
O
N
E
.
d
w
g
ORIGINAL SIZE 24X36
ENT
I
T
L
E
M
E
N
T
DRA
W
I
N
G
S
NOT
F
O
R
CON
S
T
R
U
C
T
I
O
N
419 Canyon Ave. Suite 200 Fort Collins, CO 80521
phone 970.224.5828 | fax 970.225.6657 | www.ripleydesigninc.com
RIPLEY DESIGN INC.
Klara Rossouw
419 Canyon Ave. Suite 200
Fort Collins, CO 80521
p. 970.224.5828
NORTH COLLEGE 1311, LLC
262 E. Mountain Ave.
Fort Collins, CO 80524
p. 970.490.2626
ENGINEER
LAND PLANNER
NORTHERN ENGINEERING
Blaine Mathisen
301 N Howes St, Suite 100
Fort Collins, CO 80521
p. 970.221.4158
OWNER
NATURAL HABITAT
BUFFER ZONE
PDP/FDP SUBMITTAL
MASON STREET
INFRASTRUCTURE
5
4
PDP/FDP RD 5
PDP/FDP RD 4
03/12/2024
01/31/2024
12/20/2023PDP/FDP RD 33
10/4/2023PDP RD 22
5/24/2023PDP RD 11
FORT COLLINS, CO
KR
LO
R23-008
L5.00
NORTH
0 25 50 100
SCALE: 1"=50'-0"
PROPERTY BOUNDARY
LOT LINES
DRY CREEK TOP OF BANK
EXISTING TREES
LEGEND
NATURAL AREA BUFFER NOTES
1.STANDARDS FOR PROTECTION DURING CONSTRUCTION - THE DIRECTOR SHALL ESTABLISH A "LIMITS OF
DEVELOPMENT" ("LOD") LINE(S) TO ESTABLISH THE BOUNDARY OF THE PROJECT OUTSIDE OF WHICH NO
LAND DISTURBANCE ACTIVITIES WILL OCCUR DURING THE CONSTRUCTION OF THE PROJECT.
2.SEE SECTION 3.4.1 OF THE LAND USE CODE FOR ALLOWABLE USES WITHIN THE BUFFER ZONE.
3.CONSTRUCTION SHALL BE ORGANIZED AND TIMED TO MINIMIZE THE DISTURBANCE OF SENSITIVE SPECIES
OCCUPYING OR USING ON-SITE AND ADJACENT NATURAL HABITATS OR FEATURES.
4.CONSTRUCTION OF BARRIER FENCING SHALL BE PROVIDED AT THE LIMITS OF THE DEVELOPMENT DURING
CONSTRUCTION.
NATURAL HABITAT BUFFER ZONE
MITIGATION
NHBZ TO BE MITIGATED 76,484 SF
NHBZ MITIGATION 77,013 SF
NHBZ
EXISTING NHBZ 164,420 SF
PROPOSED NHBZ 165,013 SF
`
NORTHERNENGINEERING.COM | 970.221.4158 SWMP: MASON STREET INFRASTRUCTURE
FORT COLLINS | GREELEY APPENDIX
APPENDIX D
PERMITS / APPLICATIONS
`
NORTHERNENGINEERING.COM | 970.221.4158 SWMP: MASON STREET INFRASTRUCTURE
FORT COLLINS | GREELEY APPENDIX
APPENDIX E
INSPECTION LOGS
STORM WATER MANAGEMENT PLAN
INSPECTION TABLE
Engines Energy Conversions Lab
BMP Name/ Desc.Date Erosion Control Measures Effective Brief Revision Description
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
1
STORM WATER MANAGEMENT PLAN
INSPECTION TABLE
Engines Energy Conversions Lab
BMP Name/ Desc.Date Erosion Control Measures Effective Brief Revision Description
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
2
STORM WATER MANAGEMENT PLAN
INSPECTION TABLE
Engines Energy Conversions Lab
BMP Name/ Desc.Date Erosion Control Measures Effective Brief Revision Description
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
3
STORM WATER MANAGEMENT PLAN
INSPECTION TABLE
Engines Energy Conversions Lab
BMP Name/ Desc.Date Erosion Control Measures Effective Brief Revision Description
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
4
STORM WATER MANAGEMENT PLAN
INSPECTION TABLE
Engines Energy Conversions Lab
BMP Name/ Desc.Date Erosion Control Measures Effective Brief Revision Description
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
5
STORM WATER MANAGEMENT PLAN
INSPECTION TABLE
Engines Energy Conversions Lab
BMP Name/ Desc.Date Erosion Control Measures Effective Brief Revision Description
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
6
STORM WATER MANAGEMENT PLAN
INSPECTION TABLE
Engines Energy Conversions Lab
BMP Name/ Desc.Date Erosion Control Measures Effective Brief Revision Description
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
7
STORM WATER MANAGEMENT PLAN
INSPECTION TABLE
Engines Energy Conversions Lab
BMP Name/ Desc.Date Erosion Control Measures Effective Brief Revision Description
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
8
STORM WATER MANAGEMENT PLAN
INSPECTION TABLE
Engines Energy Conversions Lab
BMP Name/ Desc.Date Erosion Control Measures Effective Brief Revision Description
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
9
STORM WATER MANAGEMENT PLAN
INSPECTION TABLE
Engines Energy Conversions Lab
BMP Name/ Desc.Date Erosion Control Measures Effective Brief Revision Description
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
10
STORM WATER MANAGEMENT PLAN
INSPECTION TABLE
Engines Energy Conversions Lab
BMP Name/ Desc.Date Erosion Control Measures Effective Brief Revision Description
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
11
`
NORTHERNENGINEERING.COM | 970.221.4158 SWMP: MASON STREET INFRASTRUCTURE
FORT COLLINS | GREELEY APPENDIX
APPENDIX F
CONTRACTOR INSERTS
`
NORTHERNENGINEERING.COM | 970.221.4158 SWMP: MASON STREET INFRASTRUCTURE
FORT COLLINS | GREELEY APPENDIX
APPENDIX G
CONTRACTOR INSERTS