HomeMy WebLinkAboutSEVEN GENERATIONS MULTIFAMILY - FDP230008 - SUBMITTAL DOCUMENTS - ROUND 1 - EROSION CONTROL LETTER/REPORT
EROSION CONTROL REPORT
FOR
Seven Generations Multifamily
Prepared by:
Highland Development Services
6355 Fairgrounds Ave, Suite 100
Windsor, Colorado 80550
Phone: 970.674.7550
Prepared for:
Black Timber Builders
1303 W. Swallow Road
Fort Collins, CO 80525
Office: 970.282.7522
March 1, 2023
Job Number 22-1057-00
6355 FAIRGROUNDS AVE, SUITE 100, WINDSOR, COLORADO 80550 | PHONE 970.674.7550
March 1, 2023
City of Fort Collins Utilities – Stormwater Department
700 Wood Street
Fort Collins, CO 80522
RE: Erosion Control/Stormwater Management Plan for Seven Generations Multifamily
Fort Collins Stormwater Department,
We are pleased to submit for your review, this Erosion Control Report/Stormwater
Management Plan for the Seven Generations Multifamily housing project. This report provides
the City with an erosion control plan for the proposed development that addresses the topics
outlined in the City Erosion Control Report Requirements. This plan mimics the State of
Colorado General Permit and Stormwater Management Plan requirements.
I appreciate your time and consideration in reviewing this submittal. Please call if you have any
questions.
Sincerely,
Highland Development Services
Zach Wiele
Page i
TABLE OF CONTENTS
Table of Contents ............................................................................................................................. i
General Description and Location .................................................................................................. 1
Site Description and Location ...................................................................................................... 1
Site Soils ....................................................................................................................................... 2
BMPs for Stormwater Pollution Prevention ................................................................................... 5
Erosion and Sediment Controls ................................................................................................... 5
Materials Handling and Spill Prevention ..................................................................................... 7
Stormwater Management Controls ................................................................................................ 9
SWMP Administrator ................................................................................................................... 9
Identification of Potential Pollution Sources ............................................................................... 9
Final Stabilization and Long-term Stormwater Management ...................................................... 11
Inspection and Maintenance ........................................................................................................ 12
SWMP Implementation................................................................................................................. 13
Appendix ....................................................................................................................................... 14
Appendix A – BMP Details ........................................................................................................... A
Appendix B – Vicinity Map and Drainage & Erosion Control Plans ............................................. B
Appendix C – Construction Sequence ......................................................................................... C
Appendix D – Erosion Control Escrow Calculation ...................................................................... D
Appendix E – Soil Information ..................................................................................................... E
Appendix F – City of Fort Collins Standard Erosion Control Notes ..............................................F
Page 1
GENERAL DESCRIPTION AND LOCATION
SITE DESCRIPTION AND LOCATION
The project site is situated in the southeast quarter of Section 30, Township 7 North, Range 68
West of the 6th Principal Meridian, City of Fort Collins, County of Larimer, in the State of
Colorado. The property consists of Lot 2 and the south 85 feet of the west 410 feet of Lot 4 of
the New Hampshire Subdivision, west of the intersection of Vermont Drive and Eastbrook
Drive. It is bounded by open space owned by the City of Fort Collins to the north, Eastbrook
Drive to the east, commercial development to the south, and the Union Pacific Railroad to the
west.
The site was previously developed as commercial office spaces with one building, the parking
lot, and all of the utility infrastructure currently constructed. The total site, including the
existing improvements and commercial office building is approximately 3.64 acres. The area of
proposed redevelopment, approximately 1.28 acres, is currently unimproved and was originally
approved with the Seven Generation Office Park for two additional commercial office buildings
and plaza space. The Seven Generations Multifamily proposes to redevelop this area with the
construction of a single 75-unit multifamily building and supporting access and plaza spaces.
The existing infrastructure, parking and utilities, is to generally be protected in place and
utilized to support the proposed redevelopment. The project site generally slopes from the
southeast to the northwest at approximately 2% toward an existing water quality pond in the
northwest corner of the property. The water quality pond was designed and constructed to
support the previous commercial office development and is well established with vegetation.
The intent is to protect the existing water quality pond and be utilized to provide water quality
enhancement for the existing improvements.
No wetlands are located within the area of proposed redevelopment.
The project site is not located within the FEMA floodway or floodplain and is within the non-
printed FEMA FIRM panel 08069C1000F, effective 12/19/2006. The site is within the City of Fort
Collins Foothill Master Drainage Basin and the City 100-yr floodplain is located along the west
and north sides of the property. The redevelopment area is outside of the City’s 100-yr
floodplain. Due to the vicinity of the site to this floodplain, timing of the peak runoff, and
proposed impervious area, on site detention was not required per the approval of the Seven
Generations Office Park.
The proposed redevelopment includes a single 75-unit multifamily building and plaza space that
will provide the required emergency access. The existing improvements will generally be
2
protected in place and will provide the required parking, utility services, and standard water
quality. A filtration gallery is proposed to provide additional the stormwater quality
enhancement and is intended to satisfy the low impact development (LID) requirement.
The site was previously analyzed within the “Final Drainage and Erosion Control Report for
Seven Generations Office,” prepared by Interwest Consulting Group, revised October 12, 2006.
SITE SOILS
The Seven Generations Multifamily redevelopment project site consists primarily of Nunn clay
loam and a small portion of Fort Collins loam both classified as Type C hydrologic group.
According to USDA/Natural Resource Conservation Group, Type C soils a have slow infiltration
rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the
downward movement of water or soils of moderately fine texture or fine texture. These soils
also have a slow rate of water transmission.
Per the “Preliminary Subsurface Exploration Report, 3400 Eastbrook Drive, Fort Collins,
Colorado,” prepared by Earth Engineering Consultants, Inc. dated March 2, 2006:
“A thin mantle of topsoil/vegetation was encountered at the surface at boring locations. The
topsoil/vegetation was underlain by clayey sand and in boring B-1 and sandy lean clay in
borings B-2 and B-3. The clayey sand and sandy lean clay showed low swell potential in
laboratory testing at present moisture and density. The essentially granular soils extended to
the bottom of borings B-1 while moderately cohesive soils extended to depths of approximately
14 and 8 ft, respectively, in borings B-2 and B-3.
The lean clay soils in boring B-2 and B-3 were underlain in poorly graded sand and gravel. The
granular soils were loose to medium dense with cobbles observed with depth. The sand and
gravel extended to the bottom of the borings at depths of approximately 15 feet below present
site grades.”
Groundwater was also observed during the subsurface soil exploration:
“Observations were made while drilling and after completion of the borings to detect the
presence and depth to the hydrostatic groundwater table. At the time of drilling, no free
groundwater was observed in the test borings.”
3
SOIL TYPE PERCENT OF
SITE
HYDROLOGIC
SOIL GROUP1
K
FACTOR2
WIND
GROUP3
Fort Collins loam, 3-5% slopes 4.8% C 0.43 5
Nunn clay loam, 1-3% slopes 79.0% C 0.28 6
Nunn clay loam, wet, 1-3% slopes 16.2% C 0.24 6
1Hydrologic soil groups range from A to D with group A having a high infiltration rate and D having a very
slow infiltration rate
2K factors range from 0.02 to 0.69. The higher value, the more susceptible the soil is to sheet and rill
erosion by water.
3Soils assigned to wind group 1 are the most susceptible to wind erosion, soils assigned to wind group 8
are the least susceptible.
Overall, the soils on site can be classified as moderately erodible and thus the project must
implement an adequate erosion control strategy to control sediment migration from leaving
the site. Please refer to Appendix E for the detailed on-site soil information from the NRCS Soil
Survey of Larimer County.
The anticipated sequence of construction shall progress as follows:
1) Installation of perimeter and offsite erosion control measures (mainly outlet
protection at the detention pond outlet structures). Other measures as required
for erosion control will be constructed throughout the project.
2) Clearing, stripping, stockpiling, and grading
3) Utility installation
4) Sub-grade preparation for the parking areas, drives and sidewalks
5) Curb, gutter, and sidewalks
6) Paving
7) Building construction (this may occur simultaneously with items 5 through 7)
8) Final grading and landscaping. All disturbed ground will be impervious (concrete,
asphalt, or building), seeded and mulched, sodded or xeriscaped to permanently
stabilize the site.
4
The run-off coefficients associated with this project for onsite sub-basins are as follows:
TRIBUTARY
SUB-BASIN
AREA
(acres)
RUNOFF
COEFFIECENT
C2 C100
1A 0.35 0.74 0.93
1B 0.99 0.83 1.00
1A+1B 1.33 0.81 1.00
2 1.72 0.73 0.92
1A+1B+2 3.05 0.77 0.96
3 0.83 0.45 0.56
Totals 3.88 0.70 0.87
No outside sources of pollution currently exist on this site. Potential pollutant sources brought
onto the site during construction will be discussed (along with spill prevention) below. The
anticipated non-stormwater components of discharge with this project are landscape irrigation
return flows. The existing storm infrastructure to convey runoff includes swales, inlets, and
storm drainpipes. Stormwater water quality enhancement is achieved through the use of the
existing water quality pond and the proposed Filtration Gallery.
5
BMPS FOR STORMWATER POLLUTION PREVENTION
EROSION AND SEDIMENT CONTROLS
STRUCTURAL PRACTICES: Structural practices for the site will consist mainly of inlet protection,
sediment control logs, and rock socks which are described in detail in the following paragraphs.
Detail drawings of these BMPs are also included in Appendix A. These BMPs are expected to
change as the construction progresses and it is the responsibility of the contractor to ensure
appropriate BMPs are in place and/or removed at the appropriate time in the construction
sequence. All temporary and permanent erosion and sediment control practices must be
maintained and repaired as needed to assure continued performance of their intended
function. All BMPs shall be inspected and repaired or replaced as described further in this
report and as required to satisfy the conditions of the Permit.
Refer to Erosion & Sedimentation Control Plans for detailed BMP sequencing and maintenance
plans for the project through all stages of construction.
Soil stockpiles, if required, should be kept below the locally mandated maximum height and
surrounded with silt fencing or other acceptable means. If the storage of these soils is going to
be for an extended period of time, then consider temporarily seeding the soil to minimize soil
loss to wind and water erosion. Per the City of Fort Collins Stormwater Criteria Manual:
No soil stockpile shall exceed ten (10) feet in height. All soil stockpiles shall be protected
from sediment transport through the use of surface roughening, watering, and down
gradient perimeter controls. All soil stockpiles shall be protected from sediment
transport by wind in accordance with Municipal Code §12-150. All stockpiles shall be
flattened to meet grade or removed from site as soon as practical, and no later than the
completion of construction activities or abandonment of the project. All off-site stockpile
storage locations in City limits shall have a stockpile permit from the City Engineering
Department prior to using the area to store material. If frequent access from hardscape
to the stockpile is needed a structural tracking Control Measure shall be implemented.
No vehicular traffic is anticipated in/out of the disturbed area of the site during construction.
All constructions vehicles are to stage within the existing site parking lot. Adjacent roadways
will be kept clean with the understanding that if this becomes a problem, a vehicle tracking pad
(VTC) will be required. Vehicle tracking pads are intended to trap mud and sediment within
coarse grain material and provide clean access to public roadways. If required, wherever
6
construction vehicle access routes intersect paved public roads a vehicle tracking control pad
shall be installed to minimize the transport of sediment (mud) by runoff or vehicles tracking
onto the paved surface. Pads shall be maintained and refurbished when necessary to obtain
their intended result.
Concrete washout area is intended to contain washout liquids and solids that result from the
cleaning of concrete trucks and pumps. Washouts should be placed near the area where the
concrete is being poured and 50 ft from any stormwater or drainage course.
Seven Generations Multifamily proposes to utilize a Filtration Gallery to provide water quality
enhancement of the redevelopment area to satisfy the Low Impact Development requirements.
Inlet protection is required at the inlet of the filtration gallery. Sediment accumulation will need
to be observed throughout construction and during the establishment period and removed
periodically to ensure no excessive sediment enters the gallery.
Inlet protection, sediment control logs, and rock socks prevent sediment from entering storm
drainage systems prior to permanent stabilization of the disturbed site area via ponding and
settling of sediment. Sediment control logs, rock socks, or gravel bags shall be placed at
existing and proposed inlets on and near the site as inlet protection. Inlet protection must be
inspected and maintained after every rainfall event that produces runoff. Sediment must be
removed and rocks replaced. Sediment control logs and rock socks will also be used as
perimeter protection at the toe of slopes and landscaped areas. Sediment control logs and rock
socks shall be installed immediately upon completion of over-lot grading.
NON-STRUCTURAL PRACTICES: All low sloped areas exposed during land disturbing activity
(stripping, grading, utility installations, stockpiling, filling, etc.) shall be kept in a roughened
condition by ripping or disking along land contours until mulch, vegetation or other permanent
erosion control is installed.
All steep sloped areas exposed during land disturbing activity (stripping, grading, utility
installations, stockpiling, filling, etc.) shall have slope protection. The contractor shall use a
"tracked" vehicle, run perpendicular to slope so that the tracking runs on the contour to inhibit
rill/gully erosion; the contractor may use other windrow-type methods as necessary.
No soil shall remain exposed by land disturbing activity for more than thirty (30) days. At that
time temporary or permanent erosion control seed/mulch, landscaping, etc. is required.
Additional Non-Structural Practices are strongly encouraged such as minimizing the disturbance
7
of soils and vegetation, providing educational materials on disposal /recycling, spill prevention /
clean up, identification and elimination of illicit discharges, promotion of street sweeping and
the development of public education programs.
THE CONTRACTOR SHALL ADD ANY AND ALL BMP’S AND DETAILS NEEDED FOR
SEDIMENT/EROSION CONTROL.
MATERIALS HANDLING AND SPILL PREVENTION
Potential impacts from significant materials and their handling are as follows:
Chemicals, cleaning substances, and petroleum products related to the construction will be
stored within the construction trailer or storage shed where it will not be in contact with
precipitation. No storage of these materials will be allowed outside.
Fueling and maintenance of equipment shall take place at the construction staging area.
Fueling will be accomplished with fueling trucks on an as needed basis. Absorbent (kitty litter)
will be in the construction trailer and applied on any spill immediately and the dry material
disposed of properly and legally.
All construction waste shall be disposed of in the available dumpsters throughout the workday.
Liquid wastes will be hauled off site and disposed of properly and legally.
Any cleaning or maintenance of small equipment will be required to be done within a
containment device (horse trough or small “kiddy pool”) and the liquid disposed of properly
and legally.
In the event of any spill, the SWMP Administrator shall be immediately notified.
Spills can be broken into three categories. Their definitions and the procedures required to
address the spills are as follow:
MINOR SPILL – A spill generally of less than 5 gallons which is unlikely to reach adjacent waters
(i.e. equipment leak).
Procedure:
a. Stop the source of the spill.
b. Contain the spillage.
c. Contact the SWMP Administrator.
d. Clean up the spill with on-site absorbent material (kitty litter)
e. Dispose of the dry material properly or legally.
f. Document the spill and the response in the SWMP including dates and times –
verify that the pollutants are completely cleaned up.
8
g. Include incident in the following training meeting.
h. Provide information to the City of Fort Collins at the next regular inspection.
SIGNIFICANT SPILL – A spill of pollutants or oils of any size that will likely or has reached
adjacent waters, may endanger health or the environment, or which may exceed a water
quality standard.
Procedure:
a. Stop the source of the spill.
b. Contain the spillage.
c. Contact the SWMP Administrator.
d. Clean up the spill with on-site absorbent material (kitty litter)
e. Dispose of the dry material properly or legally.
f. Document the spill and the response in the SWMP – verify that the pollutants
are completely cleaned up.
g. Notify the City of Fort Collins (970) 221-6700 and the Colorado Department of
Public Health and Environment spill reporting line (877) 518-5608 of the spill.
h. Notify the same two entities above with a written submission (outlined within
the permit) within 5 calendar days.
i. Include incident in the following training meeting.
HAZARDOUS SPILL – A spill of a dangerous substance requiring expert cleanup.
Procedure:
a. Secure the area – do not approach the spill.
b. Offer first aid to any injured parties.
c. Call 911 and describe the nature of the spill and any injuries.
d. If possible, isolate downstream areas from the spill (for example, cover an inlet
that is downstream and a safe distance from the spill with plastic and soil).
e. Contact the SWMP Administrator.
f. Document the spill and the response in the SWMP
g. Notify the City of Fort Collins (970) 221-6700 and the Colorado Department of
Public Health and Environment spill reporting line (877) 518-5608 of the spill.
h. Notify the same two entities above with a written submission (outlined within
the permit) within 5 calendar days.
i. Include incident in the following training meeting.
9
STORMWATER MANAGEMENT CONTROLS
SWMP ADMINISTRATOR
The Local Contact and SWMP Administrator is (INSERT CONTACT NAME, POSITION, COMPANY,
and PHONE NUMBER).
(INSERT CONTACT) will be responsible for developing, implementing, maintaining, and revising
the SWMP. (INSERT CONTACT) will also be responsible for required inspections and
coordinating and documenting changes or repairs resulting from inspections. (INSERT
CONTACT) will be responsible for the training and enforcement aspects of the SWMP and he is
the first point of contact for any stormwater issues.
IDENTIFICATION OF POTENTIAL POLLUTION SOURCES
The permit identifies 13 potential sources that must be evaluated for their potential to
contribute pollutants to stormwater discharge. These items have been evaluated below for this
project:
1. Disturbed and stored soil – YES – The construction will require that areas be
disturbed exposing soil including foundation construction, paving and repaving,
slope construction, and utility installation, and demolition required as shown on
the plans. BMPs will include silt fence and sediment control logs and inlet
protection on existing and proposed inlets, minimizing disturbance of existing
vegetation and hard surfaces, and slope roughening and tracking of slopes after
disturbance and prior to landscaping, paving, or building will be implemented.
2. Vehicle tracking of sediment – YES – The construction will require that subgrade
be prepared for pavement and that vehicles drive on unpaved surfaces to the
proposed buildings and utility improvement locations. BMPs will include a policy
that vehicles be clean prior to entering the site and, if they become muddy
during construction or earthwork activities, mud is removed by hand from the
vehicle prior to departing the site in an area near the vehicle tracking pad. Any
soil that is tracked from the site is to be disposed of in the trash dumpster by
sweeping or scraping the material off the street. Any muddy vehicle will use the
vehicle tracking pad prior to leaving the site.
3. Management of contaminated soil – NO – To our knowledge, there is not any
existing soil contamination on-site.
4. Loading and unloading operations – YES – Chemicals and petroleum products
will be brought to the site. Anytime these are being transported, they will be in
a sealed container.
5. Outdoor storage activities – YES – Inert materials such as wood and stone will be
stored outside and will likely be covered with tarps or plastic but are not
pollutant sources and are not covered by the permit. Chemicals and petroleum
10
products will be stored within the construction trailer or storage shed. Cement
and mortar bags (if not contained in a vehicle or storage shed) will be completely
covered with plastic to avoid contact with precipitation.
6. Vehicle and equipment maintenance and fueling – YES – Vehicle maintenance
and fueling, associated with construction of the proposed improvements, will
take place. No fuel will be stored on site.
7. Significant dust or particulate generating processes – YES – Most of the site will
be exposed from the over-lot grading of the project. In order to control the dust
or particulate generating process a water truck or similar watering device will be
available at all times. The disturbed ground will be watered as needed to control
dust from leaving the site. The area of heavy construction is very limited and
none of the operations are expected to generate significant dust. All dust
control measures shall be completed in reference to the City’s Fugitive Dust
Ordinance (Ordinance No. 044, 2016) and Dust Prevention and Control Manual.
8. Routine maintenance activities involving fertilizers, pesticides, detergents, fuels,
solvents, oils, etc. – YES – Fertilizers and pesticides will not be used. Any
cleaning or maintenance of small equipment will be required to be done within a
containment device (horse trough or small “kiddy pool” and the liquid disposed
of properly and legally.
9. On-site waste management – YES – The building and site construction will result
in construction waste. A dumpster for trash and a dumpster for bulk recycling
will be on the site. Waste will be hauled to the dumpsters by hand or in loaders.
Dumpsters will be hauled off as needed. No construction waste will be left
outside overnight without being located in a dumpster. No construction debris
(including broken concrete) may be buried on the site.
10. Concrete truck/equipment washing – YES – A concrete washout will be provided
on site. This will be used for trucks and for any masonry / concrete tools.
11. Dedicated asphalt of concrete batch plants – NO – None on this project.
12. Non-structural waste sources such as worker trash and portable toilets – YES –
Trash dumpster will be available for worker’s trash and will be located near the
construction trailer and emptied weekly. Portable toilets will be staked on site
near the construction trailer.
13. Other areas where potential spills can occur – NO – The above 12 items are
adequate for the anticipated construction process.
THE CONTRACTOR IS TO UPDATE THE ABOVE INFORMATION WITH EXACT LOCATIONS OF THE
CONSTRUCTION TRAILER, VEHICLE TRACKING PAD, CONCRETE WASHOUT, DUMPSTERS, AND PORTABLE
TOILETS PRIOR TO COMMENCEMENT OF CONSTRUCTION AND UPDATE AS NECESSARY THROUGHOUT
THE CONSTRUCTION SEQUENCE.
11
FINAL STABILIZATION AND LONG-TERM STORMWATER
MANAGEMENT
Final stabilization shall be considered achieved once all proposed site improvements are in
place, all vegetation is established as identified on the landscape plan, all temporary BMPs are
removed, and the downstream conveyances are inspected and certified to be clean and free
from any construction debris resulting from the construction. Areas controlled by grass sod will
be considered established upon the completion of the sod installation. Areas of seeding will be
considered established at a vegetative density of 70%.
After stabilization, there are no other long term, permanent BMPs proposed within the site
other than routine maintenance of the site (landscape mowing, permeable paver maintenance,
pavement maintenance, etc.).
12
INSPECTION AND MAINTENANCE
Site inspections will be performed to effectively address maintenance, repair, and adequacy of
BMPs. The site inspections will be performed by the SWMP Administrator or his designee a
minimum of once every fourteen (14) calendar days on active construction sites and within 24
hours after a significant storm event (event causing erosion). As part of the site inspections the
inspector will keep documentation of all inspections and BMP maintenance, including updated
Site Maps indicating new BMPs or the removal of BMPs since the previous inspection. Blank
Site Maps will be utilized and will be redlined by the SWMP Administrator throughout
construction to note all BMPs, pollutant sources, storage locations, etc.
Any maintenance, repair, or necessary installation of BMPs that are noted during the inspection
must begin immediately. The modifications shall be noted in the SWMP and the action taken as
a result of the inspection shall be noted and certified on or attached to the original inspection
report (date and time that the repair or change was started and finished and a certification that
it was done properly).
13
SWMP IMPLEMENTATION
It is the responsibility of the contractor to operate and maintain all facilities and systems of
treatment and control which are installed to achieve compliance with the conditions of the
permit. This includes effective performance, adequate funding, adequate staffing and training,
etc. (see permit).
All personnel on the construction site who will be in a position to affect or be affected by the
SWMP shall be trained prior to beginning work. These individuals will be given general
orientation information regarding the project and SWMP, shown where the SWMP is physically
located, the SWMP will be explained to them and available for their review, and the
enforcement policy will be reviewed. Throughout the construction, as a part of a weekly safety
meeting, the SWMP will be reviewed with all attendees and any incidents discussed. All
attendees shall be logged.
14
APPENDIX
Appendix A – BMP Details
Appendix B – Vicinity Map, Phasing Plan, and Drainage & Erosion Control Plans
Appendix C – Construction Sequence
Appendix D – Erosion Control Escrow Calculation
Appendix E – Soil Information
Appendix F – City of Fort Collins Standard Erosion Control Notes
Appendix A
APPENDIX A – BMP DETAILS
REVISIONNO.BYDATEHIGHLANDDEVELOPMENT SERVICES6355 FAIRGROUNDS AVENUE, SUITE 100 | WINDSOR, CO 80550PHONE: 970.674.7550 | EMAIL: Info@Highland-DS.com | www.Highland-DS.comPREPARED BY OR UNDER THE
DIRECT SUPERVISION OF:
FOR AND ON BEHALF OF HIGHLAND
DEVELOPMENT SERVICES
REVIEW SET
NOT FOR
CONSTRUCTION
OFSHEET
DRAWN BY
CHECKED BY
DATE
SCALE (H)
HDS PROJECT #
SCALE (V)SEVEN GENERATIONS MULTIFAMILYEROSION CONTROL DETAILS3/1/23
NA
N/A
ZMW
JTC
22-1057-00
C4.00
7 9
CALL UTILITY NOTIFICATION
CENTER OF COLORADO
CALL 2-BUSINESS DAYS IN ADVANCE BEFORE YOU
DIG, GRADE OR EXCAVATE FOR THE MARKING OF
UNDERGROUND MEMBER UTILITIES.
before you dig.CallKnow what's below.
R
Appendix B
APPENDIX B – VICINITY MAP AND DRAINAGE & EROSION CONTROL PLANS
SITE
E. DRAKE RD
UNION PACIFIC RAILROADS. TIMBERLINE RDE. HORSETOOTH RDS. LEMAYAVEVicinity Map
Scale: 1" = 1000'
PROJECT DATUM: NAVD88
CITY OF FORT COLLINS BENCHMARK #43-01
EAST SIDE OF TIMBERLINE ROAD, AT THE SOUTH ENTRANCE TO C.S.U. RIGDEN FARM, ON THE NORTH END OF THE
HEAD WALL OF A STORM DITCH
ELEV= 4937.02
CITY OF FORT COLLINS BENCHMARK #12-93
NORTHWEST CORNER OF HORSETOOTH ROAD AND TIMBERLINE ROAD, ON A SIGNAL POLE BASE
ELEV= 4957.08
PLEASE NOTE: THIS PLAN SET IS USING NAVD88 FOR A VERTICAL DATUM. SURROUNDING DEVELOPMENTS HAVE
USED NGVD29 UNADJUSTED DATUM (PRIOR CITY OF FORT COLLINS DATUM) FOR THEIR VERTICAL DATUMS.
IF NGVD29 UNADJUSTED DATUM (PRIOR CITY OF FORT COLLINS DATUM) IS REQUIRED FOR ANY PURPOSE,
THE FOLLOWING EQUATIONS SHOULD BE USED:
NGVD29 UNADJUSTED DATUM (PRIOR CITY OF FORT COLLINS DATUM) = 4937.02 (NAVD88 DATUM) - 3.18'
NGVD29 UNADJUSTED DATUM (PRIOR CITY OF FORT COLLINS DATUM) = 4957.08 (NAVD88 DATUM) - 3.19'
NYLOPLAST DUCTILE IRONDO NOT POLLUTE DRAINS TO WATERWAYS
NYLOPLAST DUCTILE IRON
DO NOT POLLUTE DRAINS TO WATERWAYS
NYLOPLAST DUCTILE IRON
DO NOT POLLUTE DRAINS TO WATERWAYS
100-YR FP
100-YR FP100-YR FPVERMONT
DRIVE
(54' ROW)EASTBROOK DRIVE(54' ROW)LOT 1
NEW HAMPSHIRE SUBDIVISION
EXISTING
COMMERCIAL BUILDING
FFE = 4950.70
SEVEN GENERATIONS
MULTIFAMILY
BUILDING
FFE = 4952.25UNION PACIFIC RAILROADTRACT A
TIMBERLINE VILLAGE PUD
(City of Fort Collins)
(U&DE)
APPROX LIMITS OF
REDEVELOPMENT AREA
& DISTURBED AREA
56,500± SQFT
(1.30± ACRES)
FILTRATION GALLERY
48~SC-160LP STORMTECH CHAMBERS
EXISTING STANDARD
WATER QUALITY POND
EX TRASH
ENCLOSURE
(MODIFIED)REVISIONNO.BYDATEHIGHLANDDEVELOPMENT SERVICES6355 FAIRGROUNDS AVENUE, SUITE 100 | WINDSOR, CO 80550PHONE: 970.674.7550 | EMAIL: Info@Highland-DS.com | www.Highland-DS.comPREPARED BY OR UNDER THE
DIRECT SUPERVISION OF:
FOR AND ON BEHALF OF HIGHLAND
DEVELOPMENT SERVICES
REVIEW SET
NOT FOR
CONSTRUCTION
OFSHEET
DRAWN BY
CHECKED BY
DATE
SCALE (H)
HDS PROJECT #
SCALE (V)SEVEN GENERATIONS MULTIFAMILYDRAINAGE & EROSION CONTROL PLAN3/1/23
1" = 20'
N/A
JTC
JTC
22-1057-00
C2.00
4 9
CALL UTILITY NOTIFICATION
CENTER OF COLORADO
CALL 2-BUSINESS DAYS IN ADVANCE BEFORE YOU
DIG, GRADE OR EXCAVATE FOR THE MARKING OF
UNDERGROUND MEMBER UTILITIES.
before you dig.CallKnow what's below.
R
N
W E
S
0
SCALE: 1" = 20'
40201020
BASIN COEFFICIENT (100-YR)
BASIN DESIGNATION
BASIN AREA
DESIGN POINT
DRAINAGE FLOW ARROW
DRAINAGE BASIN BOUNDARY
DRAINAGE BASIN FLOW PATH
LEGEND
EXISTING MAJOR CONTOUR
EXISTING MINOR CONTOUR
PROPOSED MAJOR CONTOUR
PROPOSED MINOR CONTOUR
ROCK SOCK
INLET PROTECTION
SEDIMENT CONTROL LOG
CONCRETE WASHOUT AREA
NOTES
1.THE NATURAL HABITAT BUFFER ZONE (NHBZ) IS INTENDED TO BE MAINTAINED
IN A NATIVE LANDSCAPE. PLEASE SEE SECTION 3.4.1 OF THE LAND USE
CODE FOR ALLOWABLE USES WITHIN THE NATURAL HABITAT BUFFER ZONE.
2.CONTRACTOR TO PROVIDE AND MAINTAIN ALL NECESSARY EROSION
CONTROL MEASURES PRIOR TO AND THROUGHOUT CONSTRUCTION.
PLACE EROSION CONTROL PROTECTION AT ALL EXISTING INLETS
DOWNSTREAM FROM THE CONSTRUCTION AREA. EROSION CONTROL
PROTECTION SHALL REMAIN IN PLACE UNTIL CONSTRUCTION IS COMPLETE
AND ALL DISTURBED GROUND IS ADEQUATELY VEGETATED WITH OWNER'S
APPROVAL FOR REMOVAL.
3.THE EXTENT OF EROSION CONTROL PROTECTION SHALL BE OBSERVED AND
ADJUSTED AS NEEDED DURING CONSTRUCTION BASED ON SITE
CONDITIONS AND THE PERFORMANCE OF THE EROSION CONTROL
CONTROL MEASURES SHOWN, TO SUPPLY SUFFICIENT EROSION CONTROL
AND MINIMIZE DOWNSTREAM WATERWAY POLLUTION.
4.LIMIT DISTURBANCE TO AREAS WITHIN EROSION CONTROL BOUNDARIES.
ADJUST EROSION CONTROL BOUNDARIES AS NECESSARY TO ADEQUATELY
COMPLETE PROPOSED WORK. ALL DISTURBED AREAS SHALL BE PREPARED
(SEEDED & MULCHED, SURFACE ROUGHENING, ETC.) TO MINIMIZE EROSION
POTENTIAL AND SOIL MIGRATION.
5.STORMWATER MANAGEMENT PLAN SHALL BE PREPARED AND SUBMITTED
BY CONTRACTOR PRIOR TO CONSTRUCTION COMMENCEMENT.
6.SEE LANDSCAPE PLAN FOR REVEGETATION METHODS AND DETAILS.
DURING CONSTRUCTION, ANY SOIL DISTURBED AND NOT UNDER ACTIVE
CONSTRUCTION SHALL BE SEEDED AND MULCHED PER CITY STANDARDS.
7.ANY DISTURBED LAND MUST RECEIVE SURFACE ROUGHENING, INCLUDING
BUT NOT LIMITED TO SLOPED AREAS.
8.NO VEHICULAR TRAFFIC IS ANTICIPATED IN/OUT OF THE REDEVELOPMENT
AREA DURING CONSTRUCTION. ALL CONSTRUCTION VEHICLES ARE TO
STAGE WITHIN THE EXISTING SITE PARKING LOT.
9.REFERENCE SEVEN GENERATIONS MULTIFAMILY DRAINAGE REPORT.
10.REFERENCE SHEET 7 FOR EROSION CONTROL DETAILS.
Appendix C
APPENDIX C – CONSTRUCTION SEQUENCE
(Construction Phases)Mobilization Demolition Grading
Utilities
Installation
Flat work
Installation
Vertical
Installation Landscape Demobilization
Best Management Practices (BMPs)
Structural "Installation"
Silt Fence Barriers*
Contour Furrows (Ripping / Disking)
Sediment Trap / Filter*
Vehicle Tracking Pad*
Flow Barriers
Inlet protection*Any prior inlets that could use protecting
Rock Bags*Any prior inlets that could use protecting
Terracing
Rip Rap
Collecting Asphalt / Concrete Saw Cutting Waste
*All BMPs to be Removed once Construction is Complete,
with the exception of silt fencing, which shall remain in
place until seeded areas are established.
Vegetative
Temporary Seeding Planting Any time the site will sit dorment longer than 30 Days.
Mulching/Sealant Any time the site will sit dorment longer than 30 Days.
Permanent Seeding Planting
Sod Installation
Rolled Products : Netting/Blankets/Mats Any time the site will sit dorment longer than 30 Days.
Appendix D
APPENDIX D – EROSION CONTROL ESCROW CALCULATION
3/1/2023
Project:Disturbed Acres:1.30
EROSION CONTROL BMPs Units
Estimated
Quantity
Unit
Price
Total
Price
L.F. 0 $2.50 $0.00
each 12 $150.00 $1,800.00
L.F. 410 $2.00 $820.00
each 0 $500.00 $0.00
each 1 $300.00 $300.00
each 0 $800.00 $0.00
LS 1 $2,500.00 $2,500.00
Sub-Total: $5,420.00
1.5 x Sub-Total: $8,130.00
Amount of security: $8,130.00
AC 1.30 $2,000.00 $2,600.00
Sub-Total: $2,600.00
1.5 x Sub-Total: $3,900.00
Amount to Re-seed: $3,900.00
Minimum escrow amount: $3,000.00
Erosion Control Escrow:$8,130.00
Seeding
Miniumum Escrow Amount
Final Escrow Amount (Maximum between BMP, Reseeding and Minimum Escrow)
“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”
Vehicle Tracking Control Pad
Inlet Protection
Outlet Protection
Street Sweeping and Cleaning
Reseeding Amount
Erosion and Sediment Control Escrow/Security Calculation
for The City of Fort Collins
Seven Generations Multifamily
BMP Amount
Silt Fence
Rock Sock
Sediment Control Log
3/1/2023 10:58 AM G:\Projects\22-1057-00 Seven Gen (FC)\03 Design Documents\Drainage\Erosion Control\22-1057-00 - Erosion Control Escrow.xls
Appendix E
APPENDIX E – SOIL INFORMATION
Hydrologic Soil Group—Larimer County Area, Colorado
(Seven Generations)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
9/6/2022
Page 1 of 44487940448796044879804488000448802044880404488060448808044879404487960448798044880004488020448804044880604488080496300496320496340496360496380496400496420496440496460496480496500496520
496300 496320 496340 496360 496380 496400 496420 496440 496460 496480 496500 496520
40° 32' 36'' N 105° 2' 37'' W40° 32' 36'' N105° 2' 27'' W40° 32' 31'' N
105° 2' 37'' W40° 32' 31'' N
105° 2' 27'' WN
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84
0 45 90 180 270
Feet
0 10 20 40 60
Meters
Map Scale: 1:1,010 if printed on A landscape (11" x 8.5") sheet.
Soil Map may not be valid at this scale.
MAP LEGEND MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Rating Polygons
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Soil Rating Lines
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Soil Rating Points
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Water Features
Streams and Canals
Transportation
Rails
Interstate Highways
US Routes
Major Roads
Local Roads
Background
Aerial Photography
The soil surveys that comprise your AOI were mapped at
1:24,000.
Warning: Soil Map may not be valid at this scale.
Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mapping and accuracy of soil
line placement. The maps do not show the small areas of
contrasting soils that could have been shown at a more detailed
scale.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as
of the version date(s) listed below.
Soil Survey Area: Larimer County Area, Colorado
Survey Area Data: Version 16, Sep 2, 2021
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Jul 2, 2021—Aug 25,
2021
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor
shifting of map unit boundaries may be evident.
Hydrologic Soil Group—Larimer County Area, Colorado
(Seven Generations)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
9/6/2022
Page 2 of 4
Hydrologic Soil Group
Map unit symbol Map unit name Rating Acres in AOI Percent of AOI
36 Fort Collins loam, 3 to 5
percent slopes
C 0.2 4.8%
74 Nunn clay loam, 1 to 3
percent slopes
C 3.7 79.0%
76 Nunn clay loam, wet, 1
to 3 percent slopes
C 0.8 16.2%
Totals for Area of Interest 4.6 100.0%
Description
Hydrologic soil groups are based on estimates of runoff potential. Soils are
assigned to one of four groups according to the rate of water infiltration when the
soils are not protected by vegetation, are thoroughly wet, and receive
precipitation from long-duration storms.
The soils in the United States are assigned to four groups (A, B, C, and D) and
three dual classes (A/D, B/D, and C/D). The groups are defined as follows:
Group A. Soils having a high infiltration rate (low runoff potential) when
thoroughly wet. These consist mainly of deep, well drained to excessively
drained sands or gravelly sands. These soils have a high rate of water
transmission.
Group B. Soils having a moderate infiltration rate when thoroughly wet. These
consist chiefly of moderately deep or deep, moderately well drained or well
drained soils that have moderately fine texture to moderately coarse texture.
These soils have a moderate rate of water transmission.
Group C. Soils having a slow infiltration rate when thoroughly wet. These consist
chiefly of soils having a layer that impedes the downward movement of water or
soils of moderately fine texture or fine texture. These soils have a slow rate of
water transmission.
Group D. Soils having a very slow infiltration rate (high runoff potential) when
thoroughly wet. These consist chiefly of clays that have a high shrink-swell
potential, soils that have a high water table, soils that have a claypan or clay
layer at or near the surface, and soils that are shallow over nearly impervious
material. These soils have a very slow rate of water transmission.
If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is
for drained areas and the second is for undrained areas. Only the soils that in
their natural condition are in group D are assigned to dual classes.
Hydrologic Soil Group—Larimer County Area, Colorado Seven Generations
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
9/6/2022
Page 3 of 4
Rating Options
Aggregation Method: Dominant Condition
Component Percent Cutoff: None Specified
Tie-break Rule: Higher
Hydrologic Soil Group—Larimer County Area, Colorado Seven Generations
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
9/6/2022
Page 4 of 4
Appendix F
APPENDIX F – CITY OF FORT COLLINS STANDARD EROSION CONTROL NOTES
Appendix F: Construction Control Measures Standard Notes
FORT COLLINS STORMWATER CRITERIA MANUAL Appendix F
Page 1
General Erosion Control Requirements
These notes are a summary for the legal requirements, that are set forth in the Fort Collins Stormwater
Criteria Manual (FCSCM), and that any conflict is resolved by the more stringent requirement controlling.
1) The Property Owner, Owner’s Representative, Developer, Design Engineer, General
Contractor, Sub-contractors, or similar title for the developing entity (here after referred to
as the Developer) has provided these Erosion Control Materials in accordance with Erosion
Control Criteria set forth in the Manual as an attempt to identify erosion, sediment, and other
potential pollutant sources associated with these Construction Activities and preventing
those pollutants from leaving the project site as an illicit discharge. Full City requirements and
are outlined and clarified in the Manual under Chapter 4: Construction Control Measures and
should be used to identify and define what is needed on a project.
2) The Developer shall make themselves thoroughly familiar with the provisions and the content
of the specifications laid out in the Manual, the Development Agreement, the Erosion Control
Materials compiled for this project, and the following notes as all these materials are
applicable to this project.
3) The Developer shall implement and maintain Control Measures for all potential pollutants
from the start of land disturbing activities until final stabilization of the construction site.
4) The City Erosion Control Inspector shall be notified at least twenty-four (24) hours prior to
the desired start of any construction activities on this site to allow adequate time for on-site
confirmation (initial inspection which can take up to two business days after receiving the
request) that the site is in fact protected from sediment and pollutants discharges off site.
Please contact erosion@fcgov.com early to schedule those Initial Erosion Control Inspections
well in advance so that demolition, clearing, grubbing, tree removal, and scraping may begin
without delay. Failure to receive an on-site confirmation before construction activities
commence is an automatic “Notice of Violation” and can result in further enforcement
actions.
5) The Developer shall proactively provide all appropriate Control Measures to prevent damage
to adjacent downstream and leeward properties. This includes but is not limited to: trees,
shrubs, lawns, walks, pavements, roadways, structures, creeks, wetlands, streams, rivers, and
utilities that are not designed for removal, relocation, or replacement in the course of
construction.
6) At all times the Developer shall be responsible to ensure adequate Control Measures are
designed, selected, installed, maintain, repaired, replaced, and ultimately removed in order
Standard Erosion Control Notes
FORT COLLINS STORMWATER CRITERIA MANUAL Appendix F
Page 2
to prevent and control erosion suspension, sediment transportation, and pollutant discharge
as a result of construction activities associated with this project.
7) All applicable Control Measures based upon the sequencing and/or phasing of the project
shall be installed prior to those construction activities commencing.
8) As dynamic conditions (due to the nature, timing, sequence, and phasing of construction) in
the field may warrant Control Measures in addition, or different, to what is shown on these
plans, the Developer shall at all times be responsible to implement the Control Measures that
are most effective with the current state and progress of construction. The Developer shall
implement whatever measures are determined necessary, and/or as directed by the City
Erosion Control Inspector. The Developer shall insure that all Erosion Control Plans (Maps) or
SWMP documents are updated to reflect the current site conditions, with updates being
initialed and dated. These site inspections and site condition updates shall be made available
upon request by the City.
9) All listings, provisions, materials, procedures, activities, site work and the like articulated in
this or other written site-specific documents (Including but not limited to the erosion control
reports, development agreements, landscape, and drainage materials) shall meet or exceed
the most restrictive language for City, County, State, and Federal regulations with regards to
erosion, sediment, pollutant, and other pollution source Control Measures. The Developer
shall be responsible to comply with all of these aforementioned laws and regulations.
10) The Developer shall ensure that all appropriate permits (CDPS General Permit Stormwater
Discharges Associated with Construction Activity, Dewatering, Clean Water Act, Army Corps
of Engineers’ 404 Wetlands Mitigation Permit, etc.) have been attained prior to the relevant
activity has begun. These permits or copies shall be made available upon request by the City.
11) The Developer shall furnish all conveniences and assistances to aid the Erosion Control
Inspectors of materials, workmanship, records, and self-inspections, etc. of the Control
Measures involved in the construction activities.
12) The Developer shall request clarification of all apparent site construction issues that may arise
due to inconsistencies in construction plans for the site or site conditions around the selected
Control Measures by contacting the Erosion Control Inspector. The Erosion Control Inspector
will not be responsible for any explanations, interpretations, or supplementary data provided
by others.
13) All Control Measures shall be installed in accordance with the Manual.
14) The City reserves the right to require additional Control Measures as site conditions warrant,
to the extent authorized by relevant legal authority.
15) As with any construction standards, occasions may arise where the minimum erosion control
standards are either inappropriate or cannot be justified. In these cases, a variance to these
FORT COLLINS STORMWATER CRITERIA MANUAL Appendix F
Page 3
standards may be applied for pursuant to the terms, conditions, and procedures of the
Manual.
16) Inspection. The contractor shall inspect site pollutant sources and implement Control
Measures at a minimum of once every two weeks during construction and within 24 hours
following a precipitation event. Documentation of each inspection shall be recorded and
retained by the contractor.
17) All temporary Control Measures shall be cleaned, repaired, or reconstructed as necessary in
order to assure continual performance of their intended function. All retained sediments,
particularly those on paved roadway surfaces, shall be removed and disposed of in a manner
and location so as not to cause their release into any drainage way.
18) Any Control Measure may be substituted for another standard Control Measure so long as
that Control Measure is equal to, or of greater protection than the original Control Measure
that was to be used in that location. (ex. silt fence, for wattles, or for compact berms) Wattle
alone on commercial construction sites have shown to be an ineffective substitute for silt
fence or compact berms unless it is accompanied by a construction fence to prevent vehicle
traffic.
19) Any implementation or replacement of existing Control Measures for a non-standard control,
or alternative Control Measure, shall require the review and acceptance by the City erosion
control staff before the measure will be allowed to be used on this project. These Control
Measures’ details shall be submitted, reviewed and accepted to be in accordance with the
Erosion Control Criteria based upon the functionality and effectiveness in accordance with
sound engineering and hydrological practices
Land disturbance, Stockpiles, and Storage of Soils
20) There shall be no earth-disturbing activity outside the limits designated on the accepted plans.
Off road staging areas or stockpiles must be preapproved by the City. Disturbances beyond
these limits will be restored to original condition.
21) Pre-disturbance vegetation shall be identified, protected, and retained wherever possible.
Removal or disturbance of existing vegetation shall be limited to the area required for
immediate construction operations, and for the shortest practical period of time. This should
include sequencing and phasing construction activities in a way so that the soil is not exposed
for long periods of time by schedule or limit grading to small areas. This should also include
when practical advancing the schedule on stabilization activities such that landscaping takes
place shortly if not immediately after grading has occurred. Vegetation efforts shall start as
soon as possible to return the site to a stabilized condition. Sensitive areas should avoid
clearing and grading activities as much possible.
FORT COLLINS STORMWATER CRITERIA MANUAL Appendix F
Page 4
22) All exposed soils or disturbed areas are considered a potential pollutant and shall have Control
Measures implemented on the site to prevent materials from leaving the site.
23) All soils exposed during land disturbing activity (stripping, grading, utility installations,
stockpiling, filling, etc.) shall be kept in a roughened condition at all times by equipment
tracking, scarifying or disking the surface on a contour with a 2 to 4 inch minimum variation
in soil surface until mulch, vegetation, and/or other permanent erosion control is installed.
24) No soil stockpile shall exceed ten (10) feet in height. All soil stockpiles shall be protected from
sediment transport through the use of surface roughening, watering, and down gradient
perimeter controls. All soil stockpiles shall be protected from sediment transport by wind in
accordance with Municipal Code §12-150. All stockpiles shall be flattened to meet grade or
removed from site as soon as practical, and no later than the completion of construction
activities or abandonment of the project. All off-site stockpile storage locations in City limits
shall have a stockpile permit from the City Engineering Department prior to using the area to
store material. If frequent access from hardscape to the stockpile is needed a structural
tracking Control Measure shall be implemented.
25) All required Control Measures shall be installed prior to any land disturbing activity
(stockpiling, stripping, grading, etc.). All of the required erosion Control Measures must be
installed at the appropriate time in the construction sequence as indicated in the approved
project schedule, construction plans, and erosion control report.
26) All inlets, curb-cuts, culverts, and other storm sewer infrastructure which could be potentially
impacted by construction activities shall be protected with Control Measures. Material
accumulated from this Control Measure shall be promptly removed and in cases where the
protection has failed, the pipes shall be thoroughly cleaned out.
27) All streams, stream corridors, buffers, woodlands, wetlands, or other sensitive areas shall be
protected from impact by any construction activity through the use of Control Measures.
28) All exposed dirt shall have perimeter control. Any perimeter controls that drain off or has the
ability to be tracked onto the nearby hardscape shall have some form of effective sediment
control as the, or as part of the, perimeter control.
29) All exposed slopes should be protected. All exposed steep slopes (Steeper than 3:1 H:V) shall
be protected from erosion and sediment transport through use of Control Measures.
30) No soils shall remain exposed by land disturbing activity for more than thirty (30) days after
activity has ceased before required temporary seeding or permanent erosion control (e.g.
seed/mulch, landscaping, etc.) is installed. This is not just limited to projects that are
abandoned; this includes any project that is temporarily halted and no immediate activity is
to resume within the next thirty (30) days, unless otherwise approved by the City Erosion
Control Inspector. During a season when seeding does not produce vegetative cover, another
FORT COLLINS STORMWATER CRITERIA MANUAL Appendix F
Page 5
temporary erosion control shall be implemented with or until temporary seeding or
permanent erosion control can be performed.
31) All individual lots shall have effective sediment controls located on the street side and any
down gradient side. Typically most lots drain to the front yet on those cases where houses
are along a pond or drainage swale have the lot drain in a different direction than the street,
those individual lots will need protection on that down gradient side to prevent sediment
from leaving the lot. See the Individual Lot Details for further clarification.
Vehicle Tracking
32) At all points where vehicles exit or leave the exposed dirt area on to a hardscape or semi
hardscape (concrete, asphalt, road base, etc.) shall have installed at least one structural
tracking Control Measure to prevent vehicle tracking. All areas not protected by an adequate
perimeter control shall be considered a point where vehicles exit the site. Access points
should be limited to as few entrances as possible (All perimeter areas shall be protected from
tracking activities).
33) In all areas that the structural tracking Control Measures fail to prevent vehicle tracking,
collection and proper disposal of that material is required. All inlets located near access points
and affected by tracking activities shall be prevented from the introduction of sediment into
the drainage system.
34) City Municipal Code §20-62, among other things, prohibits the tracking, dropping, or
depositing of soils or any other material onto city streets by or from any source. City
Municipal Code, §26-498, among other things, prohibits the discharge of pollutants on public
or private property if there is a significant potential for migration of such pollutant. Therefore,
all tracked or deposited materials (intentional or inadvertent) are not permitted to remain on
the street or gutter and shall be removed and legally disposed of by the Developer in a timely
and immediate manner. Dirt ramps installed in the curb-lines are not exempt to these
sections of code and shall not be permitted in the street right of way (public or private).
35) If repeated deposit of material occurs on a site, additional structural tracking controls may be
required of the Developer by the City Erosion Control Inspector.
Loading and Unloading Operations
36) The Developer shall apply Control Measure to limit traffic (site worker or public) impacts and
proactively locate material delivered to the site in close proximity to the work area or
immediately incorporated in the construction to limit operational impacts to disturbed areas,
vehicle tracking, and sediment deposition that could impact water quality.
FORT COLLINS STORMWATER CRITERIA MANUAL Appendix F
Page 6
Outdoor Storage or Construction Site Materials, Building Materials, Fertilizers, and Chemicals
37) Any materials of a non-polluting nature (steel, rock, brick, lumber, etc.) shall be inspected for
any residue coming off the material during routine inspection and will generally be located
where practical at least fifty (50) feet from any permanent or interim drainage ways.
38) Any high environmental impact pollutant materials that have a high likelihood to result in
discharge when in contact with stormwater (lubricants, fuels, paints, solvents, detergents,
fertilizers, chemical sprays, bags of cement mix, etc.) should not be kept on site where
practical. When not practical, they should be stored inside (vehicle, trailer, connex, building,
etc.) and out of contact with stormwater or stormwater runoff. Where not available, they
shall be stored outside in a raised (high spots or on pallets), covered (plastic or tarped), and
sealed (leak proof container) in secondary containment location. The secondary containment
or other Control Measure shall be adequately sized, located, where practical, at least fifty (50)
feet from any permanent or interim stormwater structures or drainage ways and shall be
monitored as part of the routine inspections.
Vehicle and equipment maintenance and fueling
39) Parking, refueling, and maintenance of vehicles and equipment should be limited in one area
of the site to minimize possible spills and fuel storage areas. This area shall be located, where
practical, at least fifty (50) feet from any permanent or interim stormwater structures or
drainage ways and shall be monitored as part of the routine inspections. All areas shall keep
spill kits and supplies close.
Significant Dust or Particulate generating Process
40) The property must be actively preventing the emission of fugitive dust at all times during
construction and vegetation activities. All land disturbing activities that result in fugitive dust
shall be in accordance with Municipal Code §12-150 to reduce the impacts to adjacent
properties and community health. All required practices shall be implemented and additional
ones shall be followed. These practices include watering the sites and discontinuing
construction activities until the wind subsides as determined by any City Inspectors.
Concrete truck / equipment washing, including the concrete truck chute and associated fixtures and
equipment
41) All concrete and equipment washing shall use structural Control Measures appropriate to the
volume of wash and frequency of use. These Control Measures shall be located, where
practical, at least fifty (50) feet from any permanent or interim stormwater structures or
drainage ways and shall be monitored as part of the routine inspections. These areas shall be
clearly identified and protected from any wash from leaving the Control Measure. If frequent
FORT COLLINS STORMWATER CRITERIA MANUAL Appendix F
Page 7
access from hardscape to the Control Measure is to occur, a structural tracking Control
Measure shall be implemented. These Control Measures shall be frequently cleaned out.
42) The Developer is responsible for ensuring washing activity is taking place at the appropriate
Control Measure and site workers are not washing or dumping wash water on to the dirt or
other uncontrolled locations.
Dedicated Asphalt and concrete batch plants
43) Dedicated asphalt and concrete batch plants are not acceptable on construction sites within
the City of Fort Collins without an expressed written request and plan to reduce pollutants
associated with that type of activity and approval by the City of Fort Collins specifically the
Erosion Control Inspector. The Developer shall inform the erosion control inspection staff of
any dedicated asphalt, or concrete batch plants that is to be used on site.
Concrete Saw Cutting Materials
44) Saw cutting material shall be in accordance with Municipal Code §12-150 for air emissions
and all water applications to the saw cutting shall prevent material from leaving the
immediate site and collected. These cutting locations, once dried, shall be swept and scraped
of all material and shall have proper and legal disposal.
Waste Materials Storage and Sanitary Facilities
45) Trash, debris, material salvage, and/or recycling areas shall be, where practical, at least fifty
(50) feet from any permanent or interim stormwater structures or drainage ways and shall be
monitored as part of the routine inspections. These facilities should be located out of the wind
and covered as able. Where not able to cover, locating said areas on the side of other
structures to reduce exposure to winds, and follow maximum loading guidelines as marked
on the container. The Developer is required to practice good housekeeping to keep the
construction site free of litter, construction debris, and leaking containers.
46) Sanitary facilities shall be prevented from tipping through the use of anchoring to the ground
or lashing to a stabilized structure. These facilities shall also be located as far as practical from
an inlet, curb cut, drainage swale or other drainage conveyances to prevent material transport
from leaving the local area. This consists of the facility being located, where practical, at least
fifty (50) feet from any permanent or interim drainage ways.
Other Site Operations and Potential Spill Areas
47) Spills: For those minor spills that; are less than the State’s reportable quantity for spills, stay
within the permitted area, and in no way threaten any stormwater conveyance, notify the
FORT COLLINS STORMWATER CRITERIA MANUAL Appendix F
Page 8
City of Fort Collins Utilities by email at erosion@fcgov.com or phone (970) 817-4770. For any
significant, major, or hazardous spills, notify the City of Fort Collins Utilities by phone only
after Emergency Response (911) has been notified and is on route, County Health Department
(LCDHE) has been notified through Larimer County Sheriff Dispatch (970) 416-1985, and the
State Spill Hotline Incident Reporting have been contacted 1-877-518-5608. Written
documentation shall be provided to the City within 5 days of the event. All spills shall be
cleaned up immediately.
48) Selection of “plastic welded” erosion control blankets shall not be used in areas that wildlife,
such as snakes, are likely to be located as these have proven to cause entrapment issues.
Final stabilization and project completion
49) Any stormwater facilities used as a temporary Control Measure will be restored and storm
sewer lines will be cleaned upon completion of the project and before turning the
maintenance over to the Owner, Homeowners Association (HOA), or other party responsible
for long term maintenance of those facility.
50) All final stabilization specifications shall be done in accordance with the Manual, Chapter 4:
Construction Control Measures.
51) All disturbed areas designed to be vegetated shall be amended, seeded & mulched, or
landscaped as specified in the landscape plans within 14 working days of final grading.
52) Soil in all vegetated (landscaped or seeded) areas, including parkways and medians shall
comply with all requirements set forth in Sections 12-130 through 12-132 of the City
Municipal Code, as well as Section 3.8.21 for the City Land Use Code.
53) All seeding shall refer to landscaping plans for species mixture and application rates and
depths requirements.
54) All seed shall be drilled where practical to a depth based upon the seed type. Broadcast
seeding shall be applied at double the rate as prescribed for drill seeding and shall be lightly
hand raked after application. Hydroseeding may be substituted for drill seeding on slopes
steeper than 3(H):1(V) or on other areas not practical to drill seed and crimp and mulch. All
hydroseeding must be conducted as two separate processes of seeding and tackification.
55) All seeded areas must be mulched within twenty-four (24) after planting. All mulch shall be
mechanically crimped and or adequately applied tackifier. The use of crimped mulch or
tackifier may require multiple re-applications if not properly installed or have weathered or
degraded before vegetation has been established. Areas of embankments having slopes
greater than or equal to 3H:1V shall be stabilized with an erosion mat or approved equal to
ensure seed will be able to germinate on the steep slopes. During a season when seeding does
FORT COLLINS STORMWATER CRITERIA MANUAL Appendix F
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not produce vegetative cover, another temporary erosion control shall be implemented along
with, or until, temporary seeding or permanent erosion control can be performed.
56) The Developer shall warranty and maintain all vegetative measures for two growing seasons
after installation or until seventy percent (70%) vegetative cover has been established,
whichever is longer and meets all the Criteria outlined in the Fort Collins Stormwater Criteria
Manual Chapter 4: Construction Control Measures.
57) The Developer shall maintain, monitor, repair, and replace any and all applicable Control
Measures until final stabilization has been obtained. All Control Measures must remain until
such time as all upstream contributing pollutant sources have been vegetated or removed
from the site. When any Control Measure is removed, the Developer shall be responsible for
the cleanup and removal of all sediment and debris from that Control Measure. At the point
at which the site has been deemed stabilized and verified by City Erosion Control Inspector,
all temporary Control Measures can then be fully removed. All measures shall be removed
within 30 days after final stabilization is achieved.
58) The responsible party shall maintain and keep current all payments or related forms of
security for the Erosion Control Escrow until 1) stabilization has been reached and 2) all
Control Measures and/or BMPs have sediment materials collected and the Control Measure
removed from the site. At that time the site will be considered completed and any remaining
Erosion Control Escrow shall be returned to the appropriate parties.