HomeMy WebLinkAboutPACIFIC COAST SUPPLY WAREHOUSE - FDP200019 - - EROSION CONTROL LETTER/REPORTEROSION CONTROL REPORT
FOR
PACIFIC COAST SUPPLY
A TRACT OF LAND LOCATED IN THE SOUTHWEST QUARTER OF SECTION 3,
TOWNSHIP 7 NORTH, RANGE 68 WEST OF THE 6TH P.M.,
CITY OF FORT COLLINS, COUNTY OF LARIMER, STATE OF COLORADO
ZP#: Z19-050
September 22, 2020
Rev. January 28, 2021
EROSION CONTROL REPORT
FOR
PACIFIC COAST SUPPLY
A TRACT OF LAND LOCATED IN THE SOUTHWEST QUARTER OF SECTION 3,
TOWNSHIP 7 NORTH, RANGE 68 WEST OF THE 6TH P.M.,
CITY OF FORT COLLINS, COUNTY OF LARIMER, STATE OF COLORADO
ZP#: Z19-050
September 22, 2020
Rev. January 28, 2021
Prepared for: Pacific Coast Supply
1012 NE I-25 Frontage Road
Fort Collins, CO 80524
Owners Rep: Stuart Nielson
303-659-3213
Prepared by: ZP Architects Engineers, Inc.
2727 Bryant Street, Suite 610
Denver, CO 80211
(303) 455-3322
William J. Logan, P.E.
Project Engineer
i
September 22, 2020
City of Fort Collins
700 Wood Street
Fort Collins, CO 80522
RE: Erosion Control Report/Stormwater Management Plan for Pacific Coast Supply
Dear Sir;
We are pleased to submit for your review, this Erosion Control Report/Stormwater
Management Plan for the Pacific Coast Supply. 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.
Thank you for your consideration in reviewing this submittal. Please call if you have any
questions.
Sincerely,
William J. Logan, P.E.
ii
TABLE OF CONTENTS
I. GENERAL LOCATION AND DESCRIPTION
A. Location ................................................................................................................. 1
B. Site Soils ............................................................................................................... 1
C. Construction and Erosion Control Sequencing ...................................................... 2
II. BMPs FOR STORMWATER POLLUTION PREVENTION
A. Erosion and Sediment Controls ............................................................................. 3
B. Materials Handling and Spill Prevention ................................................................ 5
III. STORMWATER MANAGEMENT CONTROLS
A. SWMP Administrator ............................................................................................. 8
B. Identification of Potential Pollution Sources ........................................................... 8
IV. FINAL STABILIZATION AND LONG-TERM STORMWATER MANAGEMENT ....... 11
V. INSPECTION AND MAINTENANCE ........................................................................ 12
VI. SWMP IMPLEMENTATION ..................................................................................... 13
VII. REFERENCES ....................................................................................................... 14
APPENDICES .............................................................................................................. 15
Appendix A – Vicinity Map, Drainage Plan, & Erosion Control Plans ....................... 16
Appendix B – BMP Details ........................................................................................ 20
Appendix C – Construction Sequence....................................................................... 24
Appendix D – Erosion Control Escrow Calculation .................................................... 26
Appendix E – Soil Information ................................................................................... 28
Appendix F – City of Fort Collins Standard Erosion Control Notes ........................... 39
iii
I. GENERAL LOCATION AND DESCRIPTION
A. Location and Description
The proposed Pacific Coast Supply building is located on two tracts of land located
in the Southwest Quarter of Section 3, Township 7 North, Range 68 West of the 6th
Principal Meridian, City of Fort Collins, County of Larimer, State of Colorado. The
site is specifically located at 1012 NE I-25 Frontage Road.
The existing topography across the north tract slopes over native vegetative from
east to the west at an average slope of 1.2%. The currently developed south tract
also slopes east to west over a combination of native vegetation, pavement, and off
building roofs. The existing southern tract includes three buildings currently used by
Pacific Coast Supply. Both tract areas contain 4.263 acres.
A new 20,000 square-feet storage building is proposed on the north tract along with
a new storm detention pond at the northwest corner of the site. Development will
include new drive lanes from the west and south sides of the property along with
additional hard and gravel surfaces between the two tracts of land. Additional
outside storage is planned in the northeast corner of the site. Pacific Coast Supply
provides building materials such as roofing, drywall, insulation, and other non-
pollutant products.
B. Site Soils
The web soil survey describes the site soils primarily as Longmont Clay and Nunn
Clay Loam to Satanta Loam with Hydrologic Soils Group C and D. Group C/D soils
have a slow infiltration rate when thoroughly wet, and consist chiefly of layers that
impedes the downward movement of water or soils of moderately fine to fine texture
(Reference Appendix E for soil survey information). The site also has a high water
table per the Geotechnical Evaluation Report by American Geoservices (Reference
3).
SOIL TYPE PERCENT
OF SITE
HYDROLOGIC
SOIL GROUP1
K
FACTOR2
WIND
GROUP3
Longmont clay loam, 0-3% slopes 29% D 0.24 4
Nunn clay loam, 1-3% slopes 51% C 0.28 6
Satanta loam, 0-1% slopes 20% C 0.32 5
1Hydrologic soil groups C and D have slow to very slow infiltration rates.
2K factors range from 0.02 to 0.69. Higher K values are soils more susceptible to sheet and rill
erosion by water.
3Soils assigned to wind group 1 are the most susceptible, and soils assigned to wind group 8 are the
least susceptible to wind erosion.
1
Overall, the site soils 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. (Appendix E).
C. Construction and Erosion Control Sequencing
Construction Sequence:
1. Begin with ground clearing of vegetation and loose top soils.
2. Rough grade the site and establish building or other permanent pad
elevations.
3. Once the pad elevations are established, foundations and utility installations
will begin. Vertical construction can commence once foundations and rough
utilities are completed.
4. After construction nears completion, final grading will follow and the site
asphalt and concrete pavement, and aggregate yard cover can be completed.
5. Next the landscaping will be installed and the any exposed soils will be
stabilized.
BMP Phases During Construction:
1. Initial BMPs: Before any grading begins, the limits of construction, silt fences,
vehicle tracking control, stabilized staging area, ditch culvert protection and
check dams shall be installed. These items shall remain in place throughout
construction, unless noted otherwise.
2. Intermediate BMPs: The concrete washout area and additional inlet protection
as needed shall be installed during the course of Improvements are made.
Regular street sweeping and maintenance of all BMPs will be completed
weekly or as directed by the City personal.
3. Final BMP: Ground stabilization shall be completed with landscaping and the
reduction and removal of the temporary staging area.
4. Once construction is completed and approved by City personal, all BMPs
shall be removed and properly disposed.
Re-Vegetation/Final Stabilization:
1. Remove all BMPs upon re-vegetation & stabilized earthwork with landscaping
installed per landscape drawing.
2
Onsite Sub-basin Runoff Coefficients:
Sub-Basins Area Runoff Coefficient
(acres) C2 C100
A 1.995 0.73 0.91
B 0.230 0.95 1.00
C 0.491 0.35 0.44
DRS 0.915 0.55 0.69
DRE 0.053 0.25 031
DRN 0.378 0.40 0.50
DRW 0.201 0.26 0.32
(Appendix A for Drainage Plan)
No outside sources of pollution currently exist on this site. Potential pollutant sources
brought onto the site during construction are discussed below. The anticipated non-
stormwater components of discharge with this project are landscape irrigation return
flows. Runoff from the site will flow to the detention pond and into the drainage ditch
along NE I-25 Frontage Road.
II. BMPs FOR STORMWATER POLLUTION PREVENTION
A. Erosion and Sediment Controls
Structural Practices: Structural practices for the site will consist of vehicle tracking
pads, concrete washout areas, Check Dams, a Sediment Trap at the Bioretention
Pond, inlet protection, silt fencing, sediment control logs (Reference Appendix B for
BMP details). BMPs are expected to change as construction progresses, and it is
the responsibility of the contractor to ensure appropriate BMPs are in place and/or
removed at the appropriate times during construction sequencing. 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.
This project will not be phased, completing all of the proposed improvements within
a one year window. Importing and stockpiling additional soils needed for the project
will be stored on the east side of the site. Refer to Erosion & Sedimentation Control
Plans for BMP locations, detailing and sequencing.
Soil stockpiles 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. Reference City of Fort Collins
Standard Erosion Control Note number 24 (Reference 1):
3
“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.”
Vehicle tracking pads are intended to trap mud and sediment within coarse grain
material and provide clean access to public roadways. Vehicle tracking control pads
shall be installed wherever construction vehicle access routes intersect paved public
roads. This will 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 collect liquids and solids that result from the
cleaning of concrete trucks and equipment. Washouts should be placed near the
area where the concrete is being poured and 50 ft from any stormwater or drainage
course.
In addition to the detention pond’s Extended Drainage Basin (EDB), a Bioretention
pond is proposed to meet the Cities Low Impact Development (LID) requirements for
water quality treatment. This LID is located in basin A and will be installed before the
sites drive lane is completed . Necessary erosion control protection will be placed to
minimize risk of native soils migrating to the Bioretention pond. The Bioretention
pond may be utilized as a sediment trap prior to the completion of the detention
pond.
Inlet/outlet protection, silt fencing, straw bales, check dams and sediment control
logs prevent eroded soils from entering storm drainage ways prior to permanent
stabilization of the disturbed areas. Sediment Control Logs (or gravel bags) shall be
placed at existing and proposed inlets, along with a check dam within the existing
drainage ditch near the outfall from the detention pond. Straw bales shall be placed
in front of the detention pond outlet structure. Sediment and debris must be removed
and BMPs restored. Silt fencing will also be used as perimeter protection at the toe
of slopes and landscaped areas. Silt fencing and sediment control logs shall be
installed before over-lot grading commences.
Non-Structural Practices: All low sloped areas exposed during land disturbing
activity (stripping, grading, utility installations, stockpiling, filling, etc.) shall be kept in
4
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 of soils and vegetation, providing educational materials on disposal and
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.
B. 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 a 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.
5
Spills can be broken into three categories. Their definitions and the procedures
required to address the spills are as follow:
1. Minor Spills: 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.
g. Include incident in the following training meeting.
h. Provide information to the City of Fort Collins at the next regular
inspection.
2. 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.
3. 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
6
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.
7
III. STORMWATER MANAGEMENT CONTROLS
A. SWMP Administrator
The Local Contact and SWMP Administrator is:
Contact Name:
Position:
Company:
will be responsible for developing, implementing, maintaining, and
revising the SWMP. will also be responsible for required inspections
and coordinating and documenting changes or repairs resulting from inspections.
will be responsible for the training and enforcement aspects of the
SWMP and he is the first point of contact for any stormwater issues.
B. 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.
8
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
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 58 acre
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.
CONTRACTOR TO UPDATE THE ABOVE INFORMATION WITH EXACT LOCATIONS
OF THE CONSTRUCTION TRAILER, VEHICLE TRACKING PAD, CONCRETE
9
WASHOUT, DUMPSTERS, AND PORTABLE TOILETS PRIOR TO COMMENCEMENT
OF CONSTRUCTION AND UPDATED AS NECESSARY THROUGHOUT THE
CONSTRUCTION SEQUENCE.
10
IV. 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 is 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.).
11
V. 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).
12
VI. 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.
13
VII. REFERENCES
1. “Fort Collins Stormwater Criteria Manual”, dated revised November 2017.
2. "Urban Storm Drainage Criteria Manual", by Urban Drainage and Flood
Control District, Vol. 1 and 2 dated January 2016, and Vol. 3, dated
November 2010.
3. Geotechnical Evaluation Report, Project No. 0281-D20, by American
Geoservices, dated June 30, 2020.
4. Final Drainage and Erosion Control Report for Pacific Coast Supply,
by ZP Architects-Engineers, dated Sept. 2, 2020.
14
APPENDICES
Appendix A – Vicinity Map, Drainage Plan, & Erosion Control Plans
Appendix B – BMP Details
Appendix C – Construction Sequence
Appendix D – Erosion Control Escrow Calculation
Appendix E – Soil Information
Appendix F – City of Fort Collins Standard Erosion Control Notes
15
Appendix A
Vicinity Map, Drainage Plan, & Erosion Control Plans
16
17
18
19
Appendix B
BMP Details
20
21
22
23
Appendix C
Construction Sequence
24
Construction SequenceMobilization Demolition GradingUtilities InstallationFlat work InstallationVertical Installation Landscape DemobilizationBest Management Practices (BMPs)Structural "Installation"Silt Fence Barriers*Contour Furrows (Ripping / Disking)Sediment Trap / Filter (Bioretention)Vehicle Tracking Pad*Flow Barriers (Wattles)*Inlet Filter Bags*Any prior inlets that could use protectingRock Bags*Any prior inlets that could use protectingTerracingStream Flow Diversion*Rip RapCollecting Asphalt / Concrete Saw Cutting Waste*All BMPs to be Removed once Construction is Complete.VegetativeTemporary Seeding PlantingAny time the site will sit dorment longer than 30 Days.Mulching/SealantAny time the site will sit dorment longer than 30 Days.Permanent Seeding PlantingSod InstallationRolled Products : Netting/Blankets/MatsAny time the site will sit dorment longer than 30 Days.Other:25
Appendix D
Erosion Control Escrow Calculation
26
Project:Disturbed Acres:3.34
EROSION CONTROL BMPs Units
Estimated
Quantity
Unit
Price
Total
Price
L.F. 1008 $1.80 $1,814.40
E.A. 2 $315.00 $630.00
E.A. 1 $500.00 $500.00
E.A. 1 $1,200.00 $1,200.00
L.F. 75 $1.50 $112.50
E.A. 6 $50.00 $300.00
E.A. 1 $500.00 $500.00
E.A. 1 $400.00 $400.00
Sub-Total: $5,456.90
1.5 x Sub-Total: $8,185.35
Amount of security: $8,185.35
Total Acres x Price/acre: $10,034.71
$3,000.00 Sub-Total: $10,034.71
1.5 x Sub-Total: $15,052.07
Amount to Re-seed: $15,052.07
Minimum escrow amount: $3,000.00
Erosion Control Escrow:$15,052.07
Miniumum Escrow Amount
Pacific Coast Supply
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/Outlet Protection (IP/OP)
Concrete Washout (CW)
Final Escrow Amount
Erosion and Sediment Control Escrow/Security Calculation
for The City of Fort Collins
BMP Amount
Silt Fence (SF)
Vehicle Tracking Control (VTC)
Reseeding Amount
Sediment Control Log (SCL)
Straw Bales (STB)
Check Dams (CD)
Sediment Trap (ST)
9/22/2020 27
Appendix E
Soil Information
28
Hydrologic Soil Group—Larimer County Area, Colorado
(Pacific Coast Supply)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
9/23/2020
Page 1 of 44494360449438044944004494420449444044944604494480449450044943604494380449440044944204494440449446044944804494500499900499920499940499960499980500000500020500040500060500080500100500120
499900 499920 499940 499960 499980 500000 500020 500040 500060 500080 500100 500120
40° 36' 4'' N 105° 0' 4'' W40° 36' 4'' N104° 59' 54'' W40° 35' 59'' N
105° 0' 4'' W40° 35' 59'' N
104° 59' 54'' WN
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84
0 50 100 200 300
Feet
0 15 30 60 90
Meters
Map Scale: 1:1,070 if printed on A landscape (11" x 8.5") sheet.
Soil Map may not be valid at this scale.29
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 15, Jun 9, 2020
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Jul 19, 2018—Aug
10, 2018
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
(Pacific Coast Supply)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
9/23/2020
Page 2 of 430
Hydrologic Soil Group
Map unit symbol Map unit name Rating Acres in AOI Percent of AOI
63 Longmont clay, 0 to 3
percent slopes
D 1.3 29.5%
74 Nunn clay loam, 1 to 3
percent slopes
C 2.2 51.2%
94 Satanta loam, 0 to 1
percent slopes
C 0.8 19.3%
Totals for Area of Interest 4.3 100.0%
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 Pacific Coast Supply
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
9/23/2020
Page 3 of 4
31
Rating Options
Aggregation Method: Dominant Condition
Component Percent Cutoff: None Specified
Tie-break Rule: Higher
Hydrologic Soil Group—Larimer County Area, Colorado Pacific Coast Supply
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
9/23/2020
Page 4 of 4
32
K Factor, Rock Free—Larimer County Area, Colorado
(Pacific Coast Supply)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
9/22/2020
Page 1 of 34494360449438044944004494420449444044944604494480449450044943604494380449440044944204494440449446044944804494500499890499910499930499950499970499990500010500030500050500070500090500110
499890 499910 499930 499950 499970 499990 500010 500030 500050 500070 500090 500110
40° 36' 4'' N 105° 0' 4'' W40° 36' 4'' N104° 59' 54'' W40° 35' 59'' N
105° 0' 4'' W40° 35' 59'' N
104° 59' 54'' WN
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84
0 50 100 200 300
Feet
0 15 30 60 90
Meters
Map Scale: 1:1,080 if printed on A landscape (11" x 8.5") sheet.
Soil Map may not be valid at this scale.33
MAP LEGEND MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Rating Polygons
.02
.05
.10
.15
.17
.20
.24
.28
.32
.37
.43
.49
.55
.64
Not rated or not available
Soil Rating Lines
.02
.05
.10
.15
.17
.20
.24
.28
.32
.37
.43
.49
.55
.64
Not rated or not available
Soil Rating Points
.02
.05
.10
.15
.17
.20
.24
.28
.32
.37
.43
.49
.55
.64
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 15, Jun 9, 2020
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Jul 19, 2018—Aug
10, 2018
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.
K Factor, Rock Free—Larimer County Area, Colorado
(Pacific Coast Supply)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
9/22/2020
Page 2 of 334
K Factor, Rock Free
Map unit symbol Map unit name Rating Acres in AOI Percent of AOI
63 Longmont clay, 0 to 3
percent slopes
.24 1.2 29.2%
74 Nunn clay loam, 1 to 3
percent slopes
.28 2.1 50.7%
94 Satanta loam, 0 to 1
percent slopes
.32 0.8 20.1%
Totals for Area of Interest 4.2 100.0%
Description
Erosion factor K indicates the susceptibility of a soil to sheet and rill erosion by
water. Factor K is one of six factors used in the Universal Soil Loss Equation
(USLE) and the Revised Universal Soil Loss Equation (RUSLE) to predict the
average annual rate of soil loss by sheet and rill erosion in tons per acre per
year. The estimates are based primarily on percentage of silt, sand, and organic
matter and on soil structure and saturated hydraulic conductivity (Ksat). Values of
K range from 0.02 to 0.69. Other factors being equal, the higher the value, the
more susceptible the soil is to sheet and rill erosion by water.
"Erosion factor Kf (rock free)" indicates the erodibility of the fine-earth fraction, or
the material less than 2 millimeters in size.
Rating Options
Aggregation Method: Dominant Condition
Component Percent Cutoff: None Specified
Tie-break Rule: Higher
Layer Options (Horizon Aggregation Method): Surface Layer (Not applicable)
K Factor, Rock Free—Larimer County Area, Colorado Pacific Coast Supply
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
9/22/2020
Page 3 of 3
35
Wind Erodibility Group—Larimer County Area, Colorado
(Pacific Coast Supply)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
9/23/2020
Page 1 of 34494360449438044944004494420449444044944604494480449450044943604494380449440044944204494440449446044944804494500499900499920499940499960499980500000500020500040500060500080500100500120
499900 499920 499940 499960 499980 500000 500020 500040 500060 500080 500100 500120
40° 36' 4'' N 105° 0' 4'' W40° 36' 4'' N104° 59' 54'' W40° 35' 59'' N
105° 0' 4'' W40° 35' 59'' N
104° 59' 54'' WN
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84
0 50 100 200 300
Feet
0 15 30 60 90
Meters
Map Scale: 1:1,070 if printed on A landscape (11" x 8.5") sheet.
Soil Map may not be valid at this scale.36
MAP LEGEND MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Rating Polygons
1
2
3
4
4L
5
6
7
8
Not rated or not available
Soil Rating Lines
1
2
3
4
4L
5
6
7
8
Not rated or not available
Soil Rating Points
1
2
3
4
4L
5
6
7
8
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 15, Jun 9, 2020
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Jul 19, 2018—Aug
10, 2018
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.
Wind Erodibility Group—Larimer County Area, Colorado
(Pacific Coast Supply)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
9/23/2020
Page 2 of 337
Wind Erodibility Group
Map unit symbol Map unit name Rating Acres in AOI Percent of AOI
63 Longmont clay, 0 to 3
percent slopes
4 1.3 29.5%
74 Nunn clay loam, 1 to 3
percent slopes
6 2.2 51.2%
94 Satanta loam, 0 to 1
percent slopes
5 0.8 19.3%
Totals for Area of Interest 4.3 100.0%
Description
A wind erodibility group (WEG) consists of soils that have similar properties
affecting their susceptibility to wind erosion in cultivated areas. The soils
assigned to group 1 are the most susceptible to wind erosion, and those
assigned to group 8 are the least susceptible.
Rating Options
Aggregation Method: Dominant Condition
Component Percent Cutoff: None Specified
Tie-break Rule: Lower
Wind Erodibility Group—Larimer County Area, Colorado Pacific Coast Supply
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
9/23/2020
Page 3 of 3
38
Appendix F
City of Fort Collins Standard Erosion Control Notes
39
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
40
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
41
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.
42
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
43
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.
44
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
45
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
46
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
47
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.
48