HomeMy WebLinkAboutReports - Erosion Control - 07/16/2025Project: Disturbed Acres:15.32
EROSION CONTROL BMPs Units
Estimated
Quantity
Unit
Price
Total
Price
LF 3450 $2.50 $8,625.00
LF 1120 $2.20 $2,464.00
EA 16 $250.00 $4,000.00
EA 1 $1,250.00 $1,250.00
EA 1 $1,700.00 $1,700.00
EA 8 $450.00 $3,600.00
EA 4 $1,000.00 $4,000.00
AC 3 $1,000.00 $3,000.00
Sub-Total: $28,639.00
1.5 x Sub-Total: $42,958.50
Amount of security: $42,958.50
Total Acres x Price/acre: $15,320.00
$1,000.00 Sub-Total: $15,320.00
1.5 x Sub-Total: $22,980.00
Amount to Re-seed: $22,980.00
Minimum escrow amount: $3,000.00
Erosion Control Escrow:$42,958.50
Erosion and Sediment Control Escrow/Security Calculation
for The City of Fort Collins
BMP Amount
Construction Fence (CF)
Vehicle Tracking Control (VTC)
Reseeding Amount
Seeding & Mulching
Sediment Control Log (SCL)
Miniumum Escrow Amount
Touchmark Fort Collins
Unit Price of Seeding per acre:
“The amount of the security must be based on one and one-half times the estimate of the cost to install the approved measures, or one and one-half times
the cost to re-vegetate the disturbed land to dry land grasses based upon unit cost determined by the City's Annual Revegetation and Stabilization Bid,
whichever is greater. In no instance, will the amount of security be less than one thousand five hundred dollars ($1,500) for residential development or three
thousand dollars ($3,000) for commercial development”
Inlet Protection (IP)
Concrete Washout (CWA)
(add all other BMPs for the site in this list)
Final Escrow Amount
Outlet Protection (OP)
Street Sweeping (SS)
7/16/2025 10:03 AM K:\NCO_Civil\292068000_Touchmark\Project Files\Eng\SWMP\Erosion Escrow_Touchmark.xls
EROSION CONTROL REPORT
Touchmark Fort Collins
Prepared for:
Touchmark
4710 Cinquefoil Lane
Fort Collins, CO 80528
Prepared by:
Kimley-Horn and Associates, Inc.
3325 South Timberline Road - Suite 130
Fort Collins, Colorado 80525
(970) 822-7911
Project #: 292068000
Prepared: July 16, 2025
kimley-horn.com 3325 S Timberline Rd, Suite 130, Fort Collins, CO 80525 970 822 7911
July 16, 2025
City of Fort Collins
Stormwater Engineering
281 N. College Ave.
Fort Collins, CO 80524
RE: Touchmark Fort Collins
Erosion Control Report
To Whom it May Concern,
Kimley-Horn and Associates, Inc. is pleased to submit this Erosion Control Report for your review
as part of the Final Development Plan (FDP) submittal for the above referenced project. The report
outlines Best Management Practices (BMPs) to be implemented with the proposed construction to
minimize potential pollutants in stormwater discharge.
This report and attached drainage plans have been prepared in accordance with the Fort Collins
Stormwater Criteria Manual (“FCSCM”) and the latest Mile High Flood District Urban Storm
Drainage Criteria Manual (“USDCM”). This report also accompanies 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).
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 Erosion Control
Report works as effectively and efficiently as possible.
Please contact us with any questions or concerns.
Thank You,
KIMLEY-HORN AND ASSOCIATES, INC.
Mary Carlson, P.E.
Erosion Control Report
Touchmark – Fort Collins, Colorado
kimley-horn.com 3325 S Timberline Rd, Suite 130, Fort Collins, CO 80525 970 822 7911
TABLE OF CONTENTS
I. PROJECT DESCRIPTION AND NATURE OF CONSTRUCTION ............................... 1
SITE LOCATION .............................................................................................................. 1
EXISTING SITE CONDITION ............................................................................................. 1
PROPOSED CONSTRUCTION ACTIVITIES .......................................................................... 2
II. POTENTIAL POLLUTANT SOURCES ....................................................................... 2
ALL DISTURBED AND STORED SOILS ............................................................................... 2
VEHICLE TRACKING OF SEDIMENTS ................................................................................. 2
MANAGEMENT OF CONTAMINATED SOILS ........................................................................ 3
LOADING AND UNLOADING OPERATIONS .......................................................................... 3
OUTDOOR STORAGE OF CONSTRUCTION SITE MATERIALS, BUILDING MATERIALS,
FERTILIZERS, AND CHEMICALS ........................................................................................ 3
BULK STORAGE OF MATERIALS ....................................................................................... 4
VEHICLE AND EQUIPMENT MAINTENANCE AND FUELING ................................................... 4
SIGNIFICANT DUST OR PARTICULATE GENERATING PROCESSES ....................................... 4
ROUTINE MAINTENANCE ACTIVITIES INVOLVING FERTILIZERS, PESTICIDES, DETERGENTS,
FUELS, SOLVENTS, AND OILS ......................................................................................... 4
ON-SITE WASTE MANAGEMENT PRACTICES ..................................................................... 5
CONCRETE TRUCK/EQUIPMENT WASHING, INCLUDING THE CONCRETE TRUCK CHUTE AND
ASSOCIATED FIXTURES AND EQUIPMENT ......................................................................... 5
DEDICATED ASPHALT AND CONCRETE BATCH PLANTS ..................................................... 6
NON-INDUSTRIAL WASTE SOURCES SUCH AS WORKER TRASH AND PORTABLE TOILETS .... 6
SAW CUTTING AND GRINDING ......................................................................................... 6
OTHER NON-STORMWATER DISCHARGES INCLUDING CONSTRUCTION DEWATERING NOT
COVERED UNDER THE CONSTRUCTION DEWATERING DISCHARGES GENERAL PERMIT AND
WASH WATER THAT MAY CONTRIBUTE POLLUTANTS TO THE MS4 .................................... 6
III. CONSTRUCTION CONTROL MEASURES ............................................................... 7
IV. INSTALLATION AND REMOVAL SEQUENCE OF CONSTRUCTION MEASURES 8
V. MAINTENANCE AND INSPECTION REQUIREMENTS ............................................. 8
VI. FINAL VEGETATION AND STABILIZATION ............................................................ 9
X. REFERENCES ......................................................................................................... 10
XI. LIST OF APPENDICES ........................................................................................... 10
APPENDIX A – SITE REFERENCES
APPENDIX B – EROSION CONTROL PLANS
APPENDIX C – EROSION CONTROL DETAILS
APPENDIX D – LANDSCAPE PLANS
APPENDIX E – PERMITS/APPLICATIONS
APPENDIX F – INSPECTION LOGS
APPENDIX G – CONTRACTOR INSERTS
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Touchmark – Fort Collins, Colorado
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I. PROJECT DESCRIPTION AND NATURE OF CONSTRUCTION
Site Location
Touchmark Fort Collins (the “Project” or “Site”) an 18.82 acre project is located in the
northeast quarter of Section 4, Township 6 North, Range 68 West, of the Sixth Principal
Meridian, City of Fort Collins, Larimer County, State of Colorado. The parcel number for
the property is 8604000017. The address for the Site is 4710 Cinquefoil Lane,
40°31'14.25"N, 105° 0'21.50"W.
The property is currently undeveloped and is generally bounded by Cinquefoil Lane to the
West, Le Fever Drive to the South, an undeveloped farmstead to the North and the Fossil
Creek Reservoir Inlet Ditch to the East. A Vicinity Map is shown in Figure 1 below.
Figure 1: Vicinity Map
Existing Site Condition
Historically, the site drains from west to east, towards the existing regional detention pond.
The Project site is located within the Harmony Corridor (HC) Zone District. The Fossil
Creek Reservoir Inlet Ditch borders the eastern portion of the property.
Soil Properties
A Natural Resource Conservation Service (NRCS) Web Soil Survey for the project area
was obtained to determine the soil characteristics of the site. The results of this study
show that the majority of the site consists of hydrologic soil group (HSG) Type C with soils
including Larimer-Stoneham complex (within the existing pond area) and Nunn clay loam.
Therefore, HSG Type C soils were assumed for the entirety of the site for hydrologic
calculations. A copy of the Custom Soil Resource Report can be found in Appendix A.
Pathway to Nearest State Water
The Project is located within the McClellands Creek Basin, see copy of the City of Fort
Collins Drainage Basins image included in Appendix A. There is an existing regional
detention pond along the eastern boundary of the property. Stormwater ultimately drains
to the Poudre River.
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Existing Vegetative Area to Impervious Area
The site currently consists of 2% impervious area, and around 98% pervious native grass.
Existing Groundwater Depth
A Final Geotechnical Engineering Report dated October 31, 2024, was prepared by
Terracon. Per the report, there are no known significant geologic features at this site.
Groundwater was encountered at depths ranging from 22 to 28 feet below the existing
ground surface in all of the test holes. Groundwater levels will not likely affect planned
development at this site. A copy of the Geotechnical report may be found within Appendix
A.
Proposed Construction Activities
The Project is proposing to develop the site as commercial long-term care which will
include one main building, attached villas, detached cottages, as well as associated walks,
access drives, parking and landscaping to support the development. Sawcuts will be used
in adjacent roadways for utility installations. The project will provide Low Impact
Development (LID) and water quality treatment for the roadway improvements, while each
respective future lot is anticipated to provide separate LID and water quality treatment.
II. POTENTIAL POLLUTANT SOURCES
All Disturbed and Stored Soils
The whole site except for the existing regional pond area will be disturbed during
demolition and grading of the site. 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.
Based upon the site design this site should not disturb all areas of construction until it is
required to as part of the Construction Activities (phasing). Once exposed those areas of
exposed soils should be kept in a roughened condition (surface roughening). Around the
perimeter, construction fence with rock wattles should be used to ensure sediment does
not leave the site. Soil that is transported onto adjacent roadways should be swept or
scraped (street sweeping) to prevent the migration of sediment. Curb inlet protection
should be placed at all downstream inlets to limit suspended runoff bring transported
downstream in stormwater runoff (rock sock style inlet protection).
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 stockpile should be kept loose, not compacted,
and watered as needed to prevent dust issues (site watering). The stockpile should be
monitored for signs of erosion displacement and sediment accumulation and if conditions
warrant it, the stockpile should be structurally covered or if it is going to sit a long while
will be reseeded (temporary seeding).
Vehicle Tracking of Sediments
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
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off or rain conditions when mud collects on vehicles tires and is tracked out onto the road
consequently leaving site. This increases the possibility of sediment discharging to the
storm system. To prevent tracking, construction fence (site barrier/site management
control) should be used site wide to limit the access by the contractor and their subs to
only one construction entrance (vehicle tracking pad to be installed) on the south side of
the site off of Lefever Drive. There will be a gate at the entrance that will be closed before
contractors come on site during the muddy days (site management control) and should
only be opened to let larger deliveries drop off, otherwise subcontractor parking should be
kept to the street. All contractors have signed contracts that should have them clean the
streets if they are found to be tracking dirt onto the street (site management control). The
tracking pad should 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 should be scraped and swept (street sweeping). Secondary
controls at the closest affected combination inlets should have protection (drop inlet
protection) to capture sediment not swept up in a timely manner.
Management of Contaminated Soils
There are no known contaminated soils on the site. If encountered, the contractor should
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 and with
good construction safety and practices.
Loading and Unloading Operations
This project will have diverse loading and unloading. There should not be a significant
amount of export leaving the site, the foundation workers should have to deliver forms to
the site and deliver premixed concrete. Building materials should have to be staged
around the site and Landscapers should need to pile the materials on site to complete the
landscape work. It is anticipated that the loading and unloading vehicles will be
contributing to material being tracked out onto adjacent roadways. Depending on the type
of material delivered to the site they may have a significant spill potential. In addition to
the vehicle tracking of sediments section of this report, (VTC, Sweeping, etc.) contractors
should require subcontractors to park offsite or on stabilized areas with lower potential for
tracking debris (site management control). Where the project is mostly dirt, and not stable
contractors should encourage semi-trailers to pull alongside the project and site loaders
should be used to off load the trailers. Where the site parking lot and private drives have
been installed materials should be placed in piles along the hardscape the use of site
forklifts should be more heavily used. 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 should be done under roofs or awnings
where possible and be located away from storm drains and where nearby spill kits are
accessible. Spills on site should be addressed using spill prevention and response
procedures.
Outdoor Storage of Construction Site Materials, Building Materials,
Fertilizers, and Chemicals
It is anticipated that inert material like wood, shingles, tiles, siding insulation and stone
should be stored on site and outside in the elements. It is also anticipated that materials
that do not weather well (cement, mortar, etc.) should also be located outside. Chemicals
are not anticipated to be left outside. The contractor should monitor as the inert materials
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have a lower potential to leave the site to make sure they are not being impacted by the
exposure to the elements (site management control). The materials that should need
added attention are the cements and mortars as they quickly mix with water and cause
pollution issues. When not stored inside the contractor should place these materials 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, should be stored in the construction CONEX 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.
Bulk Storage of Materials
No structures will be built on site at this time and no liquid chemicals above 55 gallons are
expected.
Vehicle and Equipment Maintenance and Fueling
In the case that vehicle and equipment maintenance and fueling is needed on site, the
contractor should monitor these activities carefully to avoid contamination from small spills
of petroleum. Some grading companies will employee a fuel truck to fill the heavy
equipment on site or require the maintenance of a broken machine. In those 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 should be located as far from
stormwater features as possible and at least 50 feet from a stormwater feature (site
management/materials management). Spill materials should be nearby, and a bucket or
other container and shovel located nearby to hang a hose after filling to catch drips, and
to scoop up any dirt that inadvertently mixed with the soil (materials management). That
container should have a lid and be disposed of when the activity is completed. The
contractor should require maintenance work to be done on a tarp or other material to
prevent the residual oils and greases from mixing with the dirt (materials management).
Significant Dust or Particulate Generating Processes
This project will result in earth moving activities, street sweeping, and track -out and carry
out, bulk materials transport and saw cutting. As these activities result in offsite transport
of atmospheric pollution reasonable precautions shall be taken. The contractor should
follow all required “BMPs” articulated in the Fugitive Dust Manual and a least one
additional BMP included during each of the identified activities in accordance with City
Ordinance No. 044,2016. Also, a copy of the Dust Control Manual should be kept in the
trailer during construction for reference. Such activities will include but not limited to
watering the site, covering trucks, slower site speeds and vehicle tracking mentioned
above.
Routine Maintenance Activities Involving Fertilizers, Pesticides,
Detergents, Fuels, Solvents, and Oils
Fertilizers and Pesticides should be used during the later phases of the project when trying
to establish a 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 should be strictly followed and not on days, or the next day, where
the weather is calling for precipitation (materials management control). As most of these
types of chemicals will be brought on by the Landscaper, the contractor should require
them to keep these products in their vehicles until time of application and they should not
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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). If any detergents, paints, acids, cement, grout, and solvents are used, they could
be mixed with water and cause the water to be discolored, cloudy, or sudsy. The contractor
should keep an eye out for water that is discolored, cloudy, or sudsy around the site (site
management control). When these materials are to be handled, operated, and cleaned up
all within the inside of the structure, where external use is concerned these materials will
be stored in the construction CONEX box, trailers, vehicles, or the like out of contact with
precipitation (materials management). If not stored in a location as described secondary
containment will be required (materials management). Fuels and oils might be associated
with the smaller equipment used on site, chainsaws, pumps, generators, etc. As petroleum
products are easily suspended in water and are spread across the top of the water surface.
These products when located in water have rainbow sheen on them. The contractor
should also monitor during construction (site management controls). These products will
be stored in the construction CONEX box, trailers, vehicles, or similar structure 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.
On-site Waste Management Practices
All large and heavy weighted waste piles (concrete chunks, excavated pipes, etc.) should
be kept in a neat, grouped pile until the material is to be disposed of properly. The
contractor should only store these piles for a short duration 5-10 days and should keep
them 50 feet from any drainage course or inlet (Administrative Control). All dry wastes
should be maintained through dumpsters and monthly hauler removal (hauler should 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, the contractor should require an increased removal schedule where the “Max
fill line” on the dumpster should be strictly followed. Corners of the dumpsters should be
monitored for “Dumpster Juice” leaking into the soil in dry conditions and rain/melt off
conditions looking for it mixing with the runoff. Dumpsters, like the waste piles, should be
located at least 50 feet from any drainage course or inlet. Contractors should require
workers to collect trash at the end of the day to prevent trash being left out overnight. No
construction debris (including broken concrete) should be buried on site.
Concrete Truck/Equipment Washing, Including the Concrete Truck Chute
and Associated Fixtures and Equipment
Concrete will be a large portion of this project. It is anticipated that it should be used with
the joints around the manholes, pour in place inlets, curb and gutter installation, sidewalks,
and foundations. Premixed concrete trucks should be used in this process and should be
delivered to the site and when pouring the foundation, a pump truck should be used all of
which will need to be maintained through the washing of their chutes and pump arms to
prevent the concrete from hardening and ruining the equipment. This concrete wash water
has a high alkaline content which is hazardous material to terrestrial and aquatic wildlife.
The contractor should designate a section of dirt near the entrance to be excavated and
compacted around the sides formed 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 should 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 should be
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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 can be
used on site in a similar location and 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 should 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).
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 should be delivered to the site and placed.
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
should be required on the site. Worker trash will be comingled with the industrial trash and
should follow the same controls with the caveat that a trashcan should 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. If tipped over and when being
cleaned, portable toilet facilities become a potential discharge if not cleaned up. If human
waste is spilled, the contractor should require it be treated as a biological hazard of
untreated sewage, and it should need to be cleaned up in accordance with Larimer County
Health Department Guidance. The toilets should 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
should be provided. They should also be anchored prevent from tipping. All materials shall
be properly disposed of in accordance with the law.
Saw Cutting and Grinding
The street connections will require cutting into the city street. This project should need the
use of hardened saws. These saws generate a significant amount of dust. The contractor
should require the watering the cutting surface to prevent airborne particulates (BMP in
the City’s Fugitive Dust Manual). 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 should use the minimum amount of water
needed to prevent dust and blades from overheating (site management control). Cutting
slurry should be collected via vacuum or allowed to dry out and be scraped and swept up
after the cutting has finished (saw cutting).
Other Non-Stormwater Discharges Including Construction Dewatering not
Covered under the Construction Dewatering Discharges General Permit
and Wash Water that may Contribute Pollutants to the MS4
Based upon the geotechnical data, ground water levels indicate that it will be significantly
lower (11 ½ to 15 feet) than the bottom of the deepest excavation. However, if
encountered, dewatering activities may be required. Groundwater has in most excavations
mixed with the dirt and as they are pumped, they will add an increased velocity coming
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out of the out flow end contributing to erosion and speeding 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. 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 should be used and a silt bag should 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
should be collected in accordance with that permit.
III. CONSTRUCTION CONTROL MEASURES
Throughout the entire construction of the project, erosion control devices shall be installed
to ensure minimal pollutant migration. These erosion control measures 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 measures 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.
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.
Construction Fence (CF)
A construction fence restricts site access to designated entrances and exits, delineates
construction site boundaries and keeps construction out of sensitive areas. Fencing
should be used in combination with other perimeter control BMPs such as rock wattles or
silt fence. Fencing should be inspected daily.
Rock Wattle (RW)
Rock wattles is made of rock or gravel wrapped in a geotextile having a long cylindrical
shape. They are used as a part of perimeter and sediment control. Rock wattles are often
placed along the base of construction fence around the entire perimeter of a site.
Inlet Protection (IP)
Inlet Protection consists of permeable barriers installed around inlets to filter runoff and
keep sediment from entering a storm drain inlet. Existing and proposed inlets should be
covered with inlet protection during construction.
Outlet Protection (OP)
Outlet Protection consists of permeable barriers installed around outlets to help 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. Existing and proposed outlets should be covered with outlet
protection during construction.
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Concrete Washout (CWA)
Concrete Washout area involves designating and properly managing a specific area for
concrete washout. It can be created using one of several approached designed to
receive wash water from washing tools, dump trucks, mobile batch mixers or pump
trucks.
Vehicle Tracking Control (VTC)
Vehicle tracking controls provide stabilized construction site access where vehicles can
enter and exit the site on to paved public roads. It is used to remove sediment (mud or
dirt) from vehicles to limit tracking onto the paved surface.
Stockpile Management (SP)
Stockpile management included measures to minimize erosion and sediment transport
from soil stockpiles.
Surface Roughening (SR)
Surface Roughening involves tracking, scarifying, imprinting, or tilling a disturbed area to
provide temporary stabilization of disturbed areas. Surface roughening created variations
in the soil surface to minimize wind and water erosion.
IV. INSTALLATION AND REMOVAL SEQUENCE OF
CONSTRUCTION MEASURES
Prior to construction a construction fence, vehicle tracking control, and concrete washout
areas should be installed to ensure limited access to the site and to control sediment being
transported on and off site. Inlet protection at any existing inlets should also be put in
place. As demolition is occurring surface roughening should be completed on the empty
lots to limit runoff occurring on site.
Following demolition and as the site and roadways are being constructed curb socks
should be added along the flowlines, a stabilized staging area and stockpile management
area should be created to hold construction equipment and materials. Inlet protection
should be added to proposed inlets as they are constructed.
Finally temporary vegetation should be added to the empty lots to stabilize them prior to
future development being added. Street sweeping should take place to ensure sediment
does not enter storm network.
These erosion control measures 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 measures 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.
V. MAINTENANCE AND INSPECTION REQUIREMENTS
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. 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. Attention should be paid to areas
with a significant potential for stormwater pollution, such as demolition areas, concrete
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washout locations, and vehicle entries to the site. The inspection must be documented to
ensure compliance with the permit requirements.
Any BMPs not operating in correctly 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 in the inspection logs found in Appendix F.
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 rele ases.
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. Details have also been included in Appendix B.
VI. FINAL VEGETATION AND STABILIZATION
Final stabilization of the site will be achieved by either leaving a paved surface in place or
by reseeding. All areas to be seeded as outlined in the Final Landscape Plan, or required
by the City in the disturbance of other properties, will have the area amended in
accordance with section 12-132 of City Municipal Code and be seeded based upon the
specs called out in the landscape plan. A copy of the Landscape plans can be found in
Appendix D. All seeded areas will be crimped and mulched same day or next day after
seeding in accordance with the Temporary and Permanent Seeding Details associated
with this project, and in accordance with the City of Fort Collins Erosion Control Criteria.
Once installed there will be no temporary irrigation system so all seeding will be monitored
until the site has reached a vegetative cover (density) of 70%.
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 irrigation 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.
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X. REFERENCES
City of Fort Collins Flood Maps, City of Fort Collins GIS, Accessed October 22, 2024, at
<https://gisweb.fcgov.com/HTML5Viewer/Index.html?viewer=FCMaps&LayerTheme=flo
odplains>
Custom Soil Resource Report, Natural Resources Conservation Service, United States
Department of Agriculture. Web Soil Survey. October 22, 2024.
Fort Collins Stormwater Criteria Manual, City of Fort Collins, December 2018.
Urban Storm Drainage Criteria Manual, Volumes 1-3, Mile High Flood District, Updated
March 2024.
XI. LIST OF APPENDICES
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Appendix A – Site References
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Appendix B – Erosion Control Plans
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Appendix C – Erosion Control Details
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Appendix D – Landscape Plans
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Appendix E – Permits/Applications
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Appendix F – Inspection Logs
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Appendix G – Contractor Inserts