HomeMy WebLinkAboutTIMBERLINE INTERNATIONAL APU - PDP200014 - SUBMITTAL DOCUMENTS - ROUND 3 - STORMWATER MANAGEMENT PLAN
Stormwater Management Plan
for
Timberline-International
Preliminary Development Plan
Fort Collins, Colorado
April 26, 2021
Prepared for:
FR Holdings, LLC
Devin Ferrey
125 S. Howes Street; 2nd Floor
Fort Collins, CO 80521
Prepared by:
11582 Colony Row
Broomfield, Colorado 80021
Phone: (720)259-0965, Fax: (720)259-1519
Project Number: 1805.00 - TIM
I hereby certify that this Stormwater Management Plan for the Timberline-
International PDP was prepared under my direct supervision in accordance with the
State of Colorado storm drainage design and technical criteria, for the Owners thereof.
_____________________________________ 4/26/2021
Mary B. Wohnrade, P.E.
Registered Professional Engineer
State of Colorado No. 30325
Table of Contents
I. SITE DESCRIPTION ................................................................................................................................... 1
1.1 Introduction ........................................................................................................................................... 1
1.2 Site Location and Description ......................................................................................................... 1
1.3 Construction Documents .................................................................................................................. 1
1.4 Proposed Site Improvements ......................................................................................................... 1
1.5 Sequence of Major Activities ........................................................................................................... 2
1.6 Area of Site and Disturbed Area..................................................................................................... 2
1.7 Runoff Information ............................................................................................................................. 2
1.8 Existing Vegetation/Ground Cover............................................................................................... 3
1.9 Potential Pollution Sources ............................................................................................................. 3
1.10 Non-Stormwater Components of Discharge ......................................................................... 5
1.11 Receiving Water ............................................................................................................................... 5
II. BMP’S FOR STORMWATER POLLUTION PREVENTION ............................................................. 6
2.1 Site Map ................................................................................................................................................... 6
2.2 BMPs Before and During Construction ....................................................................................... 6
2.3 Post Construction BMPs .................................................................................................................... 8
2.4 Materials Handling and Spill Prevention .................................................................................... 9
III. FINAL STABILIZATION AND LONG-TERM STORMWATER MANAGEMENT ..................... 9
3.1 Measures to Achieve Final Stabilization ..................................................................................... 9
IV. INSPECTION AND MAINTENANCE PROCEDURES .................................................................... 10
4.1 Inspection Procedures .................................................................................................................... 10
4.2 Maintenance Procedures ............................................................................................................... 10
4.3 Record keeping .................................................................................................................................. 11
4.4 Revising BMP’s and the SWMP .................................................................................................... 11
V. AIR QUALITY STATIONARY SOURCE PERMITTING .................................................................... 11
5.1 Regulations ......................................................................................................................................... 11
5.2 Air Pollutant Emission Notice (APEN) ..................................................................................... 11
5.3 Fugitive Dust Control Plan for Land Development .............................................................. 12
VI. REFERENCES .......................................................................................................................................... 12
APPENDICES
Appendix A Erosion and Sediment Control Inspection List
Erosion and Sediment Control Escrow Calculations
Construction Sequence Chart
Appendix B City of Fort Collins Construction Control Measures, Standard Notes
PLANS
Sheet 1 Stormwater Management Plan (SWMP) Pre-Disturbance Plan
Sheet 2 Stormwater Management Plan (SWMP) Interim Plan
Sheet 3 Stormwater Management Plan (SWMP) Final Stabilization Plan
Sheet 4 Erosion Control Details
Sheet 5 Erosion Control Details
Timberline-International
Stormwater Management Plan (SWMP)
April 26, 2021
P a g e | 2
Stormwater Management Plan
for
Timberline-International FDP
Fort Collins, Colorado
April 26, 2021
I. SITE DESCRIPTION
1.1 Introduction
This Stormwater Management Plan (SWMP) has been prepared in compliance with the
Colorado Discharge Permit System (CDPS) for stormwater discharges associated with
construction activities, from the Colorado Department of Public Health and
Environment, Water Quality Control Division (Division). A copy of this SWMP must be
kept onsite, in order to be readily available to the contractor, and to facilitate its review
by the City of Fort Collins staff during an inspection.
The objective of this SWMP is to identify Best Management Practices (BMPs), which
when implemented, will meet the terms and conditions of the CDPS.
The SWMP Administrator for this Stormwater Management Plan will be Andrew Rauch
of FR Corp., who will be the project manager during construction.
1.2 Site Location and Description
The site is located in the southwest quarter of Section 8, Township 7 North, Range 68
West of the 6th Principal Meridian, County of Larimer, Colorado. The property is
bounded by Timberline Road on the east, International Boulevard on the south, Lake
Canal on the west, and an existing commercial property on the north (See Vicinity Map).
The property site is approximately 1.39 acres, located in a commercial area and is
currently being annexed into the City of Fort Collins. The site is currently undeveloped
and contains an existing ditch access road, a fill pile, and some existing utilities.
1.3 Construction Documents
The Grading and Erosion Control Plan that accompanies this Stormwater Management
Plan (SWMP) is contained in the construction plans entitled, Timberline-International,
which have been prepared by Wohnrade Civil Engineers, Inc.
1.4 Proposed Site Improvements
Proposed improvements to the site consist of the following:
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Construction of approximately 2,900 sf and 624 sf commercial buildings;
Installation of utilities including: a new sanitary sewer service line; new water
service line; gas, telephone line, and underground electric lines;
Construction of new paved parking areas, and drives;
Construction of a new stormwater detention and water quality facility.
1.5 Sequence of Major Activities
Construction activities are expected to commence in Summer 2021. The sequence of
major activities includes:
1. Mobilization of crews and equipment, and pre-disturbance site access;
2. Site clearing and grubbing;
3. Utility and infrastructure installation;
4. Building construction;
5. Site grading;
6. Final stabilization
Site demolition will include asphalt patching, the removal of existing sanitary sewer line
and removal of existing headwall and wingwalls. Site activities continue with the
installation of underground utilities, followed by construction of the new single-story
building, site grading, construction of the parking areas and drives, and finally site
stabilization with landscaping.
Upon completion of construction, all disturbed areas will be stabilized with permanent
vegetation, bark mulch, thermal bluegrass, and cobbles. Disturbed areas will be seeded
with a native seed mix as specified on the Landscape Plan, which is contained in the
project construction plans.
1.6 Area of Site and Disturbed Area
The total area of the Timberline-International site is approximately 1.39 acres. Roughly
1.39 acres of the site are expected to be disturbed as part of this project. There will be a
minor amount offsite disturbance as part of the new storm sewer installation along
Timberline Road, and proposed street and drainage improvements at the northwest
corner of Timberline Road and International Boulevard.
1.7 Runoff Information
Soils information was obtained from the soils report for the Lot 1 Industrial Business
Park, International PUD project, dated October 1, 2018 (See Reference 1). Four
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exploratory test holes were placed within the approximate limits of the proposed site
improvements. The subsurface conditions encountered generally consisted of 2 to 3
feet of sand and clay fill overlying 2 to 7 feet of clayey sand over sand and gravel.
Groundwater was encountered during drilling at depths ranging from 11.5 to 13 feet. A
Construction Dewatering permit from the State of Colorado may be required if
groundwater is encountered during the installation of water and/or sewer utilities.
Stormwater runoff calculations have been performed as part of this project, and
developed coefficients have been derived. The 100-yr developed runoff coefficients
vary from 0.26 to 0.87.
Soil erosion potential prior to development is moderate due to existing vegetation on
the project site. Soil erosion during construction will be high due to site disturbance as
a result of construction activities.
The potential for soil erosion subsequent to development is moderate as a result of site
stabilization by re-vegetation and new paved surfaces. Re-vegetation will include a
native grass seed mix, rain garden growing media, and other vegetation, as shown on
the project Landscape Plan. Specifications and procedures for final site stabilization,
including the native grass seed mix and soil amendments, can be found on the project
Landscape Plan.
1.8 Existing Vegetation/Ground Cover
Roughly 70% of the existing site is vegetated with native grasses, weeds and trees. The
density of the existing vegetation is estimated to be roughly 60%.
1.9 Potential Pollution Sources
Potential pollution sources include the following:
1. Disturbed and Stored Soils: Disturbed soils will be stabilized at the
completion of construction as per the project Landscape Plan.
Existing vegetation will be preserved whenever possible, and
stabilized as soon as practical. Disturbed soils will be prevented from
migrating offsite through the use of inlet protection, and outlet
protection.
2. Vehicle Tracking of Sediment: The tracking of sediment onto adjacent
streets will be controlled using a vehicle tracking control pad. The
tracking control pad will help reduce the amount of sediment that is
tracked onto adjacent streets. Any sediment that enters the street will
be removed by street sweeping, either manually or, using a street
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sweeping vehicle.
3. Management of contaminated soils: Contaminated soils may be
generated onsite during construction, and may include soils
surrounding the concrete washout area, portable toilets, or near the
hazardous waste disposal area. Contaminated soils will be removed
at the conclusion of construction, and disposed of as required.
4. Loading and Unloading Operations: A stabilized staging/outdoor
storage area will be designated by the site superintendent and is likely
to change as the project progresses due to the site’s tight constraints.
This area will be stabilized to provide storage of construction
materials, and for the loading and unloading of construction vehicles.
The area will be secured using 6-foot high chain link construction
fencing. The loading of trucks for exporting excavated material will be
at a minimum, as a result of an earthwork balance.
5. Outdoor Storage Activities: Outdoor storage of building materials will
be enclosed by perimeter chain link fencing that will not require
secondary BMPs. There will be no onsite storage of fertilizers or
chemicals.
6. Equipment Maintenance and Fueling: The fueling and possible
maintenance of equipment will take place onsite in a designated
fueling/maintenance area, the location of which will be determined by
the project superintendent. The fueling and maintenance area should
be located away from adjacent streets, drainage facilities, and
watercourses.
7. Significant Dust or Particulate Generation: Dust control measures will
be used onsite when dust poses a problem to air quality. Disturbed
areas will be sprinkled with water (until wet) using a water truck to
prevent windblown sediment transport.
8. Routine Maintenance Activities: Routine maintenance activities
involving fertilizers, pesticides, detergents, fuels, solvents, and oils
include the regular inspection of hazardous waste containers, and
secondary containers. Ensure that secondary containment is
provided for hazardous materials, and ensure that all containers are
labeled property and no leaks are present.
9. On-site Waste Management: Waste materials that are generated
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onsite will be disposed of immediately, or will be placed in an onsite
designated trash and bulk waste collection area. Hazardous materials
will be segregated in a designated onsite hazardous waste collection
area, and placed in secondary containment. The contractor shall clean
up litter and debris on a regular basis. Waste collection areas will be
located away from streets, gutters, watercourses and storm sewers.
10. Concrete Washing: A concrete washout area has been delineated on
the Interim Erosion Control Plan. The designated washout area will
be identified using signage, which must be kept in good condition.
11. Dedicated asphalt or concrete batch plants: No batch plant onsite.
12. Non-industrial waste sources (worker trash and portable toilets):
Waste generated onsite will be contained in an appropriate waste
management container in a designated onsite waste collection area
located a minimum of 50-feet from any storm inlet structure or
watercourse.
Portable toilets will be located adjacent to the job trailer, as shown on
the Interim Plan, and will be maintained on a regular basis. Tie-
downs will also be provided for portable toilets to prevent a spill due
to high winds. Toilets will be located a minimum of 50-feet from any
storm inlet structure or watercourse.
13. Other potential spills: None.
1.10 Non-Stormwater Components of Discharge
There are no known springs or irrigation return flows which would contribute to non-
stormwater components of discharge from the site. The potential for dewatering
during construction is moderate based on information contained in the soils report,
which indicates that groundwater was encountered at depths ranging from 11.5' to 13'.
Should groundwater be encountered, the contractor shall obtain a Construction
Dewatering permit from the Colorado Department of Public Health and Environment.
1.11 Receiving Water
The existing site drains generally from northeast to southwest to the adjacent Lake
Canal that flows along the west and south property line. The ultimate receiving water
for all stormwater runoff from the Lot 1 Industrial Park International PUD site is the
Cache La Poudre River. Under post-project conditions, stormwater will be detained and
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released through a pond outlet pipe that conveys stormwater runoff to Lake Canal
which eventually is then conveyed to the existing storm sewer. The storm sewer then
conveys runoff to the Cache La Poudre River, which is located approximately 0.85 miles
to the south.
II. BMP’S FOR STORMWATER POLLUTION PREVENTION
2.1 Site Map
Three Site Maps have been prepared for the Initial, Interim, and Final stages of the
project.
The Pre-disturbance Site Map includes temporary erosion control measures to be
installed prior to earth moving activities. This map has been prepared by the design
engineer, and has been included in this Stormwater Management Plan.
The Interim Site Map includes structural and non-structural BMP’s to be installed
during site grading, and construction of site improvements including: the building;
parking areas and drives, and onsite detention/water quality pond. This plan has been
prepared by the design engineer, and has been included in this Stormwater
Management Plan.
The Final Stabilization Map has been prepared by the design engineer, and includes
permanent stormwater quality measures for final stabilization of the site. This plan has
been included in this Stormwater Management Plan.
Construction details for structural BMP’s can be found on the General Details sheets of
the civil construction plans for the proposed project.
2.2 BMPs Before and During Construction
Construction activities inherently produce several kinds of pollutants which may lead to
stormwater contamination. The primary concern at construction sites is sediment
transport. Best Management Practices (BMPs) describe a wide range of management
procedures, schedules of activities, prohibitions on practices, and other management
practices. BMPs include operating procedures, treatment requirements, and practices
to control site runoff, and drainage from materials storage. BMPs are also designed to
prevent or control stormwater pollutants before it has a chance to affect receiving
streams.
There are two basic types of BMPs, structural and non-structural. Structural BMPs are
generally intended to minimize erosion and sediment transport, and include physical
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processes. Non-Structural BMPs are mainly definitions of operational or managerial
techniques, and generally address temporary and permanent vegetative stabilization,
and preservation of existing mature vegetation.
Structural BMPs that will be implemented prior to construction activities include the
following:
Vehicular Tracking Control Construction equipment and vehicles will be allowed to
enter the site only at the designated entrance, which will be equipped with a stone
stabilized pad. This will act as a control measure, and minimize potential transport of
mud by vehicles or runoff. The location of the tracking pad is identified on the
Stormwater Management Plan (SWMP) Pre-Disturbance Plan (Sheet 1 of 3, attached).
The contractor will also be required to remove any sediment that is transported onto
Timberline Road using either manual or vehicular street sweeping.
Silt Fence Silt fencing is a temporary measure used to control sediment transport, and
as a perimeter control measure. Silt fencing will be installed in the location shown on
the Stormwater Management Plan (SWMP) Pre-Disturbance Plan (Sheet 1 of 3,
attached). Silt fencing is used in small drainage areas to retain sediment, and is most
effective in situations where there is overland flow. Silt fences can also be used to
capture windblown sediment.
Rock Sock Rock socks are intended to trap sediment contained in stormwater runoff
that flows into roadways as a result of construction activities. Rock socks will be placed
at regular intervals in the curb flowline to help reduce sediment loading to adjacent
storm sewer inlets. Rock socks are located in the gutter flowline near the existing curb
inlets located on the north side of International Boulevard. Since nearly the entire
property drains to an existing box culvert in the southwest corner of the site, the
proposed rock socks are an added measure of protection.
Sediment Control Logs Sediment control logs or, straw wattles, are used as a sediment
barrier to intercept sheet flow runoff from disturbed areas. Sediment control logs will
be installed along the north property line.
Non-Structural BMPs that will be implemented during construction activities include
the following:
Dust Suppression Wind erodes soil and transports sediment offsite where it may be
washed into receiving water during the next rainstorm. Disturbed areas will be
sprinkled with water until wet, as required, to prevent sediment transport.
Preservation of Natural Vegetation This practice is used as a permanent control
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measure, and provides a natural buffer zone. The contractor should ensure that
existing vegetation is preserved where possible, and that disturbed areas are stabilized
as soon as practical.
Structural BMP's that will be implemented during construction activities include the
following:
Concrete Washout Equipment and vehicles used to handle concrete will be cleaned at a
designated area selected by the construction superintendent. This area will be clearly
marked and maintained by the contractor. Once the concrete washout area is retired,
all dried concrete will be removed and hauled offsite for disposal. One concrete
washout area have been designated in the Stormwater Management Plan (SWMP)
Interim Plan (Sheet 2 of 3, attached).
Inlet Protection Storm drain inlet protection is a filtering measure placed around any
inlet or culvert to trap sediment, and prevents sediment from entering inlet structures
and existing storm sewers. Four cubic yards of pea gravel will be placed at the
upstream end of the pond outlet structure to prevent sediment from exiting the site
through the pond outlet pipe, and into the existing canal. Rock sock inlet protection will
also be placed in the gutter line along International Boulevard.
The above structural and non-structural BMP’s are shown on the Stormwater
Management Plan (SWMP) Interim Plan (Sheet 2 of 3, attached).
2.3 Post Construction BMPs
Stabilization measures will be initiated as soon as practicable in portions of the site
where construction activities have ceased. The following BMPs will be used after
construction is complete:
Outlet Protection Scour Stop transition mats will be provided at the outlet of the valley
pan, at the pond overflow weir to dissipate the velocity of concentrated stormwater
flows and prevent scour, and at the downstream end of the new access driveway curb
and gutter return transition to existing edge of pavement along Timberline Road.
Seed/Sod/Erosion Control Blankets Areas which have been disturbed by construction
will be revegetated using a native seed mix as specified on the Landscape Plan.
Permanent seeding has been specified in the areas throughout the site, including cut
slopes and the detention/water quality pond. A Landscape Plan has been prepared for
the project, and includes landscape areas surrounding the building, and adjacent to the
public right-of-way.
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The above post construction BMPs are shown on the Stormwater Management Plan
(SWMP) Final Stabilization Plan (Sheet 3 of 3, attached).
2.4 Materials Handling and Spill Prevention
There will be moderate use of chemicals, fuels and other similar materials, as it relates
to construction activities at the site. Substantial amounts of hazardous materials are
not expected to be stored onsite.
Proper precautions to be followed for spill containment are outlined in the Urban
Drainage Criteria Manual, Volume 3, Chapter 7, Construction Best Management
Practices, Section 4.4, Materials Management.
III. FINAL STABILIZATION AND LONG-TERM STORMWATER
MANAGEMENT
3.1 Measures to Achieve Final Stabilization
Final stabilization is achieved when all soil disturbing activities at the site have been
completed, and uniform vegetative cover has been established with a density of at least
seventy (70) percent of pre-disturbance levels, or equivalent permanent, physical
erosion reduction methods have been employed.
As soon as practicable after construction activities have ceased, permanent stabilization
should commence to prevent further erosion of soil from disturbed areas. All disturbed
areas (with the exception of paved and building areas) should be permanently
stabilized once construction activities have ceased.
Stormwater management controls to prevent or control pollution of stormwater
subsequent to construction include: permanent native seeding, landscape areas, and
paved surfaces.
The project Landscape Plan contains all information related to soil preparation, soil
type, native seed mixture, soil amendments, and mulching.
All temporary erosion and sediment control measures shall be removed and disposed of
within 30 days after final site stabilization is achieved, or after the temporary measures
are no longer necessary.
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IV. INSPECTION AND MAINTENANCE PROCEDURES
4.1 Inspection Procedures
Under the Term and Conditions of Section 5 of the CDPS General Permit, the permittee
will perform inspections of the storm drainage system at least once every 14 calendar
days, and within 24 hours of the end of any storm event, including but not limited to
rain or snowmelt, which results in water or sediment being transported across the site
during active construction. Inspections will occur at least once every month when all
construction activities are completed.
The permittee will designate a qualified person, or persons, to perform the following
inspections:
1) Disturbed areas and areas used for storage of materials that are
exposed to precipitation will be inspected for evidence of, or the
potential for, pollutants entering the drainage system.
2) Erosion and sediment control measures identified in this SWMP will
be observed to ensure that they are operating correctly.
3) Where discharge locations or points are accessible, they will be
inspected to ascertain whether erosion control measures are effective
in preventing significant impacts to receiving waters.
4) Locations where vehicles enter or exit the site will be inspected for
evidence of off-site sediment tracking.
Based on the results of the inspection, BMPs which are identified in this SWMP may be
revised as required, and as soon as practicable following the inspection.
The inspector will complete an Erosion and Sediment Control Inspection List (see
attachment, Appendix A) for each inspection performed. The operator will keep a
record of inspections to be made available upon request by the Colorado Water Quality
Control Division. The inspection reports will be kept on site and a copy of each
inspection report will be provided to the local and/or state agencies as requested.
4.2 Maintenance Procedures
During construction activities, every effort will be made to prevent migration of
sediment from the site. Erosion and sediment control measures must be inspected
regularly, as described in Section 4.1. All erosion and sediment control measures must
be maintained in an effective operating condition.
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Damage to erosion and sediment control systems caused by construction traffic shall be
repaired immediately by the contractor. The contractor is responsible for collecting
and disposing of all sediment and waste materials in an appropriate manner.
All maintenance activities will be performed as indicated in the manufacturer’s
specifications, or other sources determined to be acceptable.
4.3 Record keeping
Record keeping is an important component of the SWMP. Keeping records of spills,
leaks, SWMP implementation, etc. is a requirement of the general permit. Enforcement
actions, including fines, could result if records are not adequate. A logbook will be
maintained at the site for inspection reports, maintenance records, spill response, BMP
revisions, weather conditions, training, correspondence, or any other records
pertaining to implementation of the SWMP during construction.
4.4 Revising BMP’s and the SWMP
The SWMP is a “living document” that is continuously being reviewed and modified to
reflect changing site conditions. The SWMP must be modified to reflect actual field
conditions, and documented according to the procedure outlined in paragraph 4.3.
V. AIR QUALITY STATIONARY SOURCE PERMITTING
5.1 Regulations
The Colorado Department of Public Health and Environment, Air Quality Control
Commission, Regulation Number 3, states the requirements for stationary source
permitting, and air pollution emission notice requirements. Part A, Paragraph II.D.1.
specifies exemptions from Air Pollution Emission Notice Requirements. Paragraph
II.D.1.j. pertains to disturbance of surface areas for purposes of land development.
Disturbance to sites which do not exceed twenty-five (25) contiguous acres, and do not
exceed six months in duration are exempt for the requirements of Regulation Number
3.
Information regarding the City of Fort Collins Fugitive Dust Ordinance can also be found
at http://www.fcgov.com/airquality/fugitive-dust.php.
5.2 Air Pollutant Emission Notice (APEN)
Disturbance of surface areas for purposes of land development, that exceed twenty-five
(25) contiguous acres, or exceed six months in duration will be required to complete an
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Air Pollution Emission Notice (APEN) and Application for Construction Permit.
5.3 Fugitive Dust Control Plan for Land Development
The Colorado Department of Public Health and Environment, Air Quality Control
Commission, Regulation Number 1, states the requirements for emission control for
particulate matter, smoke, carbon monoxide, and sulfur oxides. Regulation 1 requires
that a fugitive dust control plan be submitted by applicants whose activity results in
fugitive dust emissions.
VI. REFERENCES
1) Geotechnical Investigation Report, Proposed Commercial Development
Lot 1, Industrial Business Park, Fort Collins, Colorado, prepared by CTL
Thompson Inc., October 1, 2018.
2) Urban Storm Drainage Criteria Manual, Mile High Flood District, Volume 3,
November, 2015.
Timberline-International
Stormwater Management Plan (SWMP)
Appendix A
ESCIL Form Prepared 5 May 2003 ESClL No. _____________
Erosion and Sediment Control Inspection Checklist (ESCIL) Page 1
E ROSION AND S EDIMENT C ONTROL I NSPECTION L IST (ESCIL)
Subdivision, Project or Site Name:
Address:
Inspection Date: __________________ Time: _____________
Temp: _______ Weather Conditions (rain, snow, cloudy, windy, etc.):
___________________________________________________________
Building Permit No.: ______________________
Reason for Inspection (check one):
Water Running Across Site
Routine Complaint High Winds
Other _______________________________ Discharge Permit No.: ______________
Construction Activities Construction Sequence
No. Type of Activity Today Planned for this Week Planned for Next Week
1 Grading
2 Excavation
3 Utility Construction
4 Foundations
5 Structural Work
6 Asphalt Paving
7 Landscaping
Erosion & Sediment Control Measures
Practice
Used
To Be
Constructed
Requires
Maintenance
Needs Replacement
(Not Functional)
Comments
No. BMP Yes No Yes No Yes No
1 Seed/Sod
2 Mulching
3 Vehicle Tracking Pad
4 Silt Fence
5 Wattles
6 Straw Bales
7 Erosion Blanket
8 Diversion Swale/Berm
9 Surface Roughening
10 Check Dams
11 Inlet Protection
12 Outlet Protection
13 Sediment Trap/Basin
14 Street Sweeping
15 Other
Additional Comments & Notes (Use back if needed):
Inspector (Signature)______________________________________ (Printed)__________________________________________
Agency: __________________________________________________________________ Date: ___________________________
ESCIL Form Prepared 5 May 2003 ESClL No. _____________
Erosion and Sediment Control Inspection Checklist (ESCIL) Page 2
Additional Comments & Notes (Cont. from Page 1):
Required Compliance Action:
3/2/2020
Project: Disturbed Acres:1.39
Area to be Revegetated (Ac)0.58
EROSION CONTROL BMPs Units
Estimated
Quantity
Unit
Price
Total
Price
L.F.421 $2.50 $1,052.50
L.F.278 $4.00 $1,112.00
EA.2 $100.00 $200.00
C.Y.4 $45.00 $180.00
EA.1 $2,000.00 $2,000.00
EA.1 $3,000.00 $3,000.00
S.F.288 $19.50 $5,616.00
Sub-Total:$13,160.50
1.5 x Sub-Total:$19,740.75
Amount of security:$19,740.75
Total Acres x Price/acre:$870.00
$1,500.00 Sub-Total: $870.00
1.5 x Sub-Total:$1,305.00
Amount to Re-seed:$1,305.00
Minimum escrow amount:$3,000.00
Erosion Control Escrow:$19,740.75
Fields in yellow should be amended for this project.
Miniumum Escrow Amount
Timberline - International
Unit Price of Seeding per acre:
“The amount of the security must be based on one and one-half times the estimate of the cost to install the approved measures, or one and one-half times the
cost to re-vegetate the disturbed land to dry land grasses based upon unit cost determined by the City's Annual Revegetation and Stabilization Bid, whichever is
greater. In no instance, will the amount of security be less than one thousand five hundred dollars ($1,500) for residential development or three thousand
dollars ($3,000) for commercial development”
Inlet Protection (IP)-Straw Wattle (SCL)
Concrete Washout Area (CWA)
Final Escrow Amount
Inlet Protection (IP)-Rock Sock
Erosion and Sediment Control Escrow/Security Calculation
for The City of Fort Collins
BMP Amount
Silt Fence (SF)
Vehicle Tracking Control (VTC)
Reseeding Amount
Scour Stop (TRM)
Gravel Inlet Protection(IP)@PondOutletStruct
3/2/2020 6:09 PM S:\1805.00_TIM\PROJECTS\SWMP\TIM_Escrow.xls
Timberlake-International FDP
Mobilization Demolition Grading
Utilities
Installation
Flat work
Installation
Vertical
Installation Landscape Demobilization (Construction Phases)
Best Management Practices (BMPs)
Structural "Installation"
Silt Fence Barriers for Perimeter Control*
Contour Furrows (Ripping / Disking)
Sediment Trap / Filter
Vehicle Tracking Pad (VTC)*
Flow Barriers (Block and Rock Inlet Protection, IP)*
Detention Pond Outlet Structure Pea Gravel Inlet Filter*
Rock Socks (RS)*
Sediment Control Logs (SCL)
Stream Flow Diversion*
Scour Stop TRM (OP)
Collecting Asphalt / Concrete Saw Cutting Waste
*All BMPs to be Removed once Construction is Complete.
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.
Other:
Timberline-International
Stormwater Management Plan (SWMP)
Appendix B
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
Page 9
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.
Project:Date:Sheets11582 Colony Row
Broomfield, Colorado 80021
Phone: (720)259-0965
Fax: (720)259-1519
No.Revisions:By:Date:
WOHNRADE CIVIL ENGINEERS, INC.TIM: 1805.004/26/20215Scale:Designed By:Reviewed By:Sheet1MBWJR1"=30'
Project:Date:Sheets11582 Colony Row
Broomfield, Colorado 80021
Phone: (720)259-0965
Fax: (720)259-1519
No.Revisions:By:Date:
WOHNRADE CIVIL ENGINEERS, INC.TIM: 1805.004/26/20215Scale:Designed By:Reviewed By:Sheet2MBWJR1"=30'
Project:Date:Sheets11582 Colony Row
Broomfield, Colorado 80021
Phone: (720)259-0965
Fax: (720)259-1519
No.Revisions:By:Date:
WOHNRADE CIVIL ENGINEERS, INC.TIM: 1805.004/26/20215Scale:Designed By:Reviewed By:Sheet3MBWJR1"=30'
Project:Date:Sheets11582 Colony Row
Broomfield, Colorado 80021
Phone: (720)259-0965
Fax: (720)259-1519
No.Revisions:By:Date:
WOHNRADE CIVIL ENGINEERS, INC.TIM: 1805.004/26/20215Scale:Designed By:Reviewed By:Sheet4MBWJR1"=30'
Project:Date:Sheets11582 Colony Row
Broomfield, Colorado 80021
Phone: (720)259-0965
Fax: (720)259-1519
No.Revisions:By:Date:
WOHNRADE CIVIL ENGINEERS, INC.TIM: 1805.004/26/20215Scale:Designed By:Reviewed By:Sheet5MBWJR1"=30'