HomeMy WebLinkAboutPOUDRE RIVER WHITEWATER PARK - - SUBMITTAL DOCUMENTS - ROUND 1 - EROSION CONTROL LETTER/REPORTPRELIMINARY
EROSION CONTROL/STORMWATER MANAGEMENT PLAN (SWMP)
FOR THE
POUDRE RIVER WHITEWATER PARK PROJECT
PREPARED FOR:
City of Fort Collins
Park Planning & Development
215 North Mason Street
Fort Collins, CO 80524
PREPARED BY:
Anderson Consulting Engineers, Inc.
375 East Horsetooth Road, Building 5
Fort Collins, CO 80525
(ACE Project Nos. COFC18.1)
ECI Site Construction Management
P.O. Box 2135
2526 SE 14th Street
Loveland, CO 80539
June 6, 2017
COFC18.1 Erosion Control‐SWMP Report (June 6 2017).docx i Anderson Consulting Engineers, Inc.
TABLE OF CONTENTS
I. INTRODUCTION ............................................................................................................................... 1
II. PROJECT INFORMATION .................................................................................................................. 2
2.1 Project Location .................................................................................................................. 2
2.2 Site Description ................................................................................................................... 2
2.3 Construction Activity........................................................................................................... 5
2.4 Sequence of Activities ......................................................................................................... 5
2.5 Site Disturbance Area ......................................................................................................... 6
2.6 Soils Information ................................................................................................................. 6
2.7 Existing Vegetation ............................................................................................................. 6
2.8 Potential Pollutant Sources ................................................................................................ 6
2.9 Allowable Sources of Non‐Stormwater Discharge .............................................................. 7
III. BMPS FOR STORMWATER POLLUTION PREVENTION ...................................................................... 8
3.1 Erosion and Sediment Controls .......................................................................................... 8
3.2 Materials Handling and Spill Prevention ............................................................................. 9
IV. STORMWATER MANAGEMENT CONTROLS ................................................................................... 12
4.1 SWMP Administrator ........................................................................................................ 12
4.2 Potential Pollutant Sources .............................................................................................. 12
4.3 Best Management Practices ............................................................................................. 13
V. FINAL STABILIZATION AND LONG TERM STORMWATER MANAGEMENT ..................................... 15
VI. INSPECTION AND MAINTENANCE .................................................................................................. 16
6.1 City of Fort Collins Standard Erosion and Sediment Control Notes .................................. 16
6.2 City of Fort Collins Erosion Control Security Calculations................................................. 17
VII. SWMP IMPLEMENTATION ............................................................................................................. 18
VIII. REFERENCES ................................................................................................................................... 19
LIST OF FIGURES
Figure 2.1 Site Map .............................................................................................................................. 3
Figure 2.2 Effective FIRM Panel with Project Area .............................................................................. 4
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TABLE OF CONTENTS (Continued)
LIST OF APPENDICES
Appendix A: BMP Details
Appendix B: Erosion Control Plan
Appendix C: Construction Sequence
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I. INTRODUCTION
The purpose of this Erosion Control/Stormwater Management Plan (SWMP) report is to address
the potential impacts that may affect the quality of stormwater being discharged from the project due
to the construction activities associated with the Poudre River Whitewater Park. The preparation and
execution of an erosion control/SWMP plan will contribute to the objective of maintaining and
improving the health and quality of the State’s waterways by utilizing various Best Management
Practices (BMPs) to reduce erosion, sediment and pollutants that reach waterways through stormwater
discharges. The project area is over one acre and will require a SWMP permit from the Colorado
Department of Public Health and Environment (CDPHE).
This project is being managed and constructed by ECI Site Construction Management (ECI) as
part of the Construction Manager/General Contractor (CMGC) delivery method selected by the City of
Fort Collins for this project. This report has been developed in a joint effort between Anderson
Consulting Engineers (ACE) and ECI and will serve as part of the required documentation for the
procurement of a SWMP permit prior to construction.
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II. PROJECT INFORMATION
2.1 Project Location
A site map for the project area has been provided as Figure 2.1. The project area is located in
Sections 11 and 12, of Township 7N, Range 69W of Larimer County, Colorado and is located entirely within
the limits of the City of Fort Collins. As illustrated on Figure 2.1, the project area is generally bounded by
Vine Drive on the north, the Union Pacific Railroad on the west, the Cache la Poudre River on the south,
and the Burlington Northern and Santa Fe (BNSF) Railroad on the east. The project area encompasses
approximately 13.3 acres of land that is currently, or will soon be owned, by the City of Fort Collins. Xcel
Energy owns a natural gas regulation station just north of the river and west of the BNSF Railroad that is
excluded from the project area.
2.2 Site Description
The project site lies within the Cache la Poudre River Basin. The Cache la Poudre River has its
origins in the Rocky Mountains, in both Roosevelt National Forest and Rocky Mountain National Park,
located west of the City of Fort Collins, Colorado. The river conveys flows from the mouth of the Poudre
Canyon, southeast to its confluence with the South Platte River east of Greeley, Colorado. The Cache la
Poudre River is regulated by the Federal Emergency Management Agency (FEMA) as part of the National
Flood Insurance Program (NFIP). The Effective Flood Insurance Rate Map (FIRM) for the project is
#08069C0977G, dated June 17, 2008. As illustrated on Figure 2.2, the majority of the project area is
situated within the effective 1‐percent annual chance (100‐year) floodplain (Zone AE) and the
southwestern portion of the project site located within the floodway.
The proposed project area includes the western portion of the Gustav Swanson Natural Area and
approximately 970 linear feet of the Poudre River. The site consists of residential/commercial property
along Vine Drive, with open space between these properties and the river. The abandoned Coy Ditch runs
through the middle of the property and previously fed the two man‐made ponds, which are referred to
as the Eastern and Western Coy Ponds throughout this report. An existing stormwater retention pond is
the located in northeastern corner of the project site and retains stormwater runoff from the
Inverness/Innosphere development properties located on the north side of Vine Drive.
In general, the site is relatively level with an approximate 1.0%‐0.50% slope towards the Cache la
Poudre River. Existing site drainage generally consists of overland flow from north to south. Off‐site
drainage enters the project site from properties north of Vine Drive. The majority of rainfall‐generated
runoff in this basin is conveyed as overland flow and is captured by the Coy Ditch, or the adjacent man‐
made ponds (Eastern and Western Coy Ponds). A small storm sewer system, consisting of four single
valley grate inlets and a 12‐inch pipe, collects runoff from the western portion of Vine Drive and conveys
it to the Western Coy Pond. When the capacity of this system is exceeded, flow overtops Vine Drive west
of Jerome Street and is conveyed overland into the Western Coy Pond. It is presumed that most of the
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Figure 2.1 Site Map for the Poudre River Whitewater Project.
Ca
c
he
La Po
u
dre
R
iver
Vine Dr
Linden Street
Cherry St
College Ave
Project Area
Union Pacific Railroad
Burlington Northern Railroad
Jerome St
0 250 500 1,000
Feet
Figure 2.2 Effective FIRM Panel with Project Area.
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Legend
Project Area
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rainfall‐generated runoff that reaches the Coy Ditch or Coy Ponds infiltrates into the groundwater table.
Flow that does not infiltrate is conveyed to the Cache la Poudre River either by direct runoff or via the Coy
Ditch through a culvert underneath the BNSF. The Cache la Poudre River ultimately discharged into the
South Platte River near Greeley, Colorado.
2.3 Construction Activity
The proposed project consists of the following improvements:
Cache la Poudre River Channel Improvements – Whitewater and grade control features will
be added upon removal of the Coy Ditch diversion dam and boat chute to provide flood
mitigation, fish passage, and increase recreational opportunities.
Pedestrian Access – trails and a new pedestrian bridge will be added to connect the project
to surrounding areas and provide access to the river.
Vine Drive – street improvements, including vertical curb, gutter, parallel parking, and storm
drainage facilities will be added on the south side of Vine Drive.
Parking Lots – A 35 space parking lot will be constructed during Phase 1. An additional 27
parking spaces will be added as part of a second phase based on parking needs and funding.
Stormwater Outfall and Water Quality Treatment – A storm sewer system and outfall to the
river will be added to provide water quality treatment and conveyance of rainfall‐generated
runoff to the river.
The activities associated with the project that could impact stormwater runoff will include, fine
grading, soil preparation, concrete sidewalk, curb and gutter, paved roadway and parking lot installation,
storm drain and pipe installation, water quality pond installation, and landscaping/irrigation.
2.4 Sequence of Activities
The construction of the project will be phased and move from west to east. Initial activities will
include the removal of the coy diversion structure, existing vegetation, relocation of existing utilities,
and the installation of a new storm sewer outfall system. The trail, park structure, and river bed areas
will be graded and prepared for installation. The parking areas will then be graded and prepared as well.
The Vine Drive curb and gutter improvements will be made along with the water quality pond
modifications. The construction will conclude with a new parking lot and final landscaping and site
stabilization.
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2.5 Site Disturbance Area
The overall area of the project site is approximately 13.3 acres. With approximately 1.15 acres
being hardscaped with concrete and asphaltic pavement and the remaining 12.15 acres being riverine or
landscaped and irrigated.
2.6 Soils Information
Existing soils general consist of a thin layer of top soil that overlays silty/clayey sands and gravels.
Depth to groundwater varies throughout the site, with general depths of 5‐10 feet. Due to the proximity
to the river and coarse soil material, groundwater depths fluctuate seasonally. Depth to bedrock also
varies throughout the site, but is generally located at depths of 15‐20 feet. Reference is made to the soils
report for the project developed by Earth Engineering Consultants (EEC) Inc called “Subsurface Exploration
Report, proposed City of Fort Collins’ – Poudre River Whitewater Park and Vine Drive Roadway
Improvements” December 8, 2016. Reference is also made to the Phase I Environmental Site Assessment
of the project area conducted by Walsh Environmental in June 2007 that indicates the possibility of
existing soil contaminants within the project area and provides recommendations for
removal/remediation.
2.7 Existing Vegetation
Existing vegetation of the site consists of upland herbaceous, sub‐canopy, riparian forest, and
developed land. Additionally, there are four wetland areas located along the Coy Ditch/Ponds. The
vegetation of the site and wetland areas were classified as part of the ecological characterization study
(ECS) that was conducted by Biohabitats and submitted to the City as part of the development review
process for this project. Due to the extensive river work and small impact to existing wetland areas, the
procurement of a 404‐permit from the U.S. Army Corps of Engineers (ACOE) will be required prior to
construction. An initial 404‐permit application was submitted to the ACOE on November 2, 2016, with a
revised submittal application provided on April 4, 2017. Reference is made to the 404‐permit application
and supplemental information prepared by Ecology and Environment, Inc.
2.8 Potential Pollutant Sources
The potential pollutant sources that may have an impact on the stormwater quality include excess
sediment from the topsoil and disturbed areas, the tracking of sediment by vehicles traveling through the
site, fuel from refueling activities, waste from concrete trails and structures, waste from asphalt paving,
and waste from portable sanitation facilities. All pollutant sources identified in the Site Assessment will
be detailed in the management plan.
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2.9 Allowable Sources of Non‐Stormwater Discharge
It is anticipated that there will be discharges associated with dewatering groundwater from the
excavation areas during construction. A separate Construction Dewatering permit will be obtained from
CDPHE and all ground water dewatering activities will be done in accordance with the permit. There will
be irrigation improvements made during the course of this project. The surface flows from the
installation of the irrigation improvements will be routed through the BMPs to mitigate any affect they
may have on the storm water quality as it is discharged from the site.
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III. BMPS FOR STORMWATER POLLUTION PREVENTION
3.1 Erosion and Sediment Controls
Structural Practices: Structural practices for the site will consist mainly of concrete washout
structure, vehicle tracking pad, construction fence with wattles and/or silt fencing for perimeter control,
sediment traps, inlet protection, erosion logs and wattles, and aggregate bags which are described in
detail in the following paragraphs. Detail drawings of these BMPs are also included in Appendix A. These
BMPs are expected to change as the construction progresses and it is the responsibility of the contractor
to ensure appropriate BMPs are in place and/or removed at the appropriate time in the construction
sequence. All temporary and permanent erosion and sediment control practices must be maintained and
repaired as needed to assure continued performance of their intended function. All BMPs shall be
inspected and repaired or replaced as required to satisfy the conditions of the Permit.
Concrete washout structure is intended to contain washout liquids and solids that result from the
cleaning of concrete trucks and pumps. Washouts should be placed near the area where the concrete is
being poured.
Vehicle tracking pad is intended to trap mud and sediment within coarse grain material and
provide clean access to public roadways. Wherever construction vehicle access routes intersect paved
public roads a vehicle tracking control pad shall be installed to minimize the transport of sediment (mud)
by runoff or vehicles tracking onto the paved surface. Pads shall be maintained and refurbished when
necessary to obtain their intended result.
Construction fence with wattles and/or silt fencing will prevent sediment from leaving the site or
being discharged into the existing wetland areas during a runoff event by collecting the deposits along the
fence/wattle while allowing the storm water to seep through. Construction fence with wattles or silt
fencing shall, at a minimum, be placed along the banks of the river and around the perimeter of the
existing Coy Ponds to prevent sediment transport and project existing wetland areas. This shall be
inspected and maintained regularly every 2 weeks/14 days and after every rainfall event that produces
runoff. Sediment must be removed and rocks replaced. This fence with wattles shall be installed prior to
any work commencing on‐site.
Sediment traps are designed to capture drainage from disturbed areas and allow settling of
sediment. Sediment traps shall be placed in the water quality pond and the Coy Ponds upstream of the
proposed storm sewer system that will convey runoff directly to the river. Inspect the sediment trap
embankments for stability and seepage. Remove accumulated sediment as needed to maintain the
effectiveness of the sediment trap. This is typically when the sediment depth is approximately one‐half
the height of the outflow embankment. Inspect the outlet for debris and damage. Repair damage to the
outlet and remove all obstructions. A sediment trap should not be removed until the upstream area is
sufficiently stabilized. Upon removal of the trap, the disturbed area should be covered with topsoil and
stabilized.
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Inlet protection, erosion logs and wattles, and aggregate bags prevent sediment from entering
storm drainage systems prior to permanent stabilization of the disturbed site area via ponding and settling
of sediment. Storm inlet protection shall be used at the existing and proposed Type R inlets and must be
inspected and maintained after every rainfall event that produces runoff. Sediment must be removed
and rocks replaced. Erosion logs shall be used at the outlets of the storm sewer lines and within the
proposed stormwater swales.
Non‐Structural Practices: If there are any low sloped areas exposed during land disturbing activity
(stripping, grading, utility installations, stockpiling, filling, etc.) they shall be kept in a roughened condition
by ripping or disking along land contours until mulch, vegetation or other permanent erosion control is
installed.
If there are any exposed steep sloped areas exposed during land disturbing activity (stripping,
grading, utility installations, stockpiling, filling, etc.) they 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 /recycling, spill prevention / clean up,
identification and elimination of illicit discharges, promotion of street sweeping and the development of
public education programs.
It is noted that the contractor shall ultimately be responsible for any and all BMPS and details
needed for sediment/erosion control.
3.2 Materials Handling and Spill Prevention
Potential impacts from significant materials and their handling are as follows:
Chemicals, cleaning substances, and petroleum products related to the construction will
be stored within the construction trailer or storage shed where it will not be in contact
with precipitation. No storage of these materials will be allowed outside.
Maintenance of equipment shall not take place on site. Fueling will be accomplished off‐
site. 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.
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In the event of any spill, the SWMP Administrator shall be immediately notified.
Spills can be broken into three categories. Their definitions and the procedures required to
address the spills are as follow:
Minor Spill – A spill generally of less than 5 gallons which is unlikely to reach adjacent
waters (i.e. equipment leak).
Procedure:
A. Stop the source of the spill.
B. Contain the spillage.
C. Contact the SWMP Administrator.
D. Clean up the spill with on‐site absorbent material.
E. Dispose of the dry material properly or legally.
F. Document the spill and the response in the SWMp including dates and time:
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.
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.
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.
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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 escribe the nature of the spill and any injuries.
D. If possible, isolate downstream areas from the spill (for example, cover an
inlet that is downstream and a safe distance from the spill with plastic and
soil).
E. Contact the SWMP Administrator.
F. Document the spill and the response in the SWMP.
G. Notify the City of Fort Collins (970) 221‐6700 and the Colorado Department
of Public Health and Environment spill reporting line (877) 518‐5608 of the
spill.
H. Notify the same two entities above with a written submission (outlined within
the permit) within 5 calendar days.
I. Include incident in the following training meeting.
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IV. STORMWATER MANAGEMENT CONTROLS
4.1 SWMP Administrator
The SWMP administrator will be David Jablonski of ECI. He will be responsible for developing,
implementing, maintaining, and revising the SWMP throughout the duration of the project. He will have
day‐to‐day control over the project and will ensure that the all SWMP conditions are met. He will also
be responsible for required inspections and coordinating and documenting changes or repairs resulting
from inspections.
4.2 Potential Pollutant Sources
Several pollutant sources have been identified which may affect the quality of stormwater
discharges from the site. They include the following:
Sediment from the topsoil and excavation storage areas that enter stormwater flows will be
filtered from these flows using a variety of natural and synthetic BMPs.
Sediment being tracked by vehicles will be removed from the vehicles as they cross the
gravel/rock vehicle tracking pad BMP at the entrances to the site. Access to the site will be
restricted to locations where vehicle tracking pads are located. Any sediment that is not
removed by the vehicle tracking pad as vehicles exit the site will be cleaned from the roadway
surfaces as required via sweeping or scraping activities. The vehicle tracking pad will be
periodically roughened to ensure that it maintains its effectiveness throughout the course of
the construction.
Contamination of soils resulting from fuel spills may occur. Any soil contaminated by a fuel
spill will be immediately removed from the site and disposed of per the spill response plan
submitted.
Any contaminated soils resulting from a spill or leak from a portable toilet facility will be
immediately removed from the site and landfilled per the spill response plan submitted.
Any soil contaminated by asphalt paving activities will be immediately removed from the site
and landfilled per the spill response plan submitted.
Any soil contaminated by concrete or concrete wash water will be removed from the site and
landfilled. All concrete wash water and waste products captured by the concrete washout
area will be removed from the site and landfilled per the spill response plan submitted.
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4.3 Best Management Practices
The Best Management Practices that will be used during the construction of the Rehabilitation
are described in the following sections indicating the implementation and phasing for each element.
Copies of the proposed erosion control plan and construction sequencing that were prepared as part of
the construction drawings are provided in Appendices B and C, respectively.
Structural Practices: The structural practices that will be in place during construction include
a vehicle tracking control pad, concrete washout area, inlet protection, and perimeter control.
Details on the construction of the individual structural BMPs are shown on the Erosion Control
Details drawing in Appendix A.
Non‐Structural Practices: The non‐structural practices will include a detailed SWMP, Spill
Response Plan, Dewatering Plan, and Erosion Control Plan.
Phased BMP Implementation: Structural BMPs will be installed prior to each phase of
construction. The vehicle tracking pad will be installed prior to allowing any access at the
entrance to the project site. The perimeter control will be installed prior to any site
disturbance. The concrete washout area will be installed prior to any concrete installation.
Material Handling and Spill Prevention: The contractor will have a port‐a‐let facility on the
project site and BMP’s will be installed around the port‐a‐let to contain any potential spills.
The contractor will provide the location and update the plan prior to construction. The vendor
supplying the port‐a‐let will be notified by the contractor if a spill occurs and the vendor will
provide the necessary means to clean up the area. Any contaminated soil from the spill will
be removed from the site and landfilled. The port‐a‐let facility will also be staked down to
prevent accidental tipping. The contractor shall provide phone numbers and a call list that will
be added to this plan when the contractor begins work on the project.
The contractor will employ a mobile refueling tank to service the equipment being used for
the construction of the project. Any contaminated soil from a spill will be immediately
removed from the site and landfilled per the spill response plan. No vehicle maintenance will
be performed on the site.
Dedicated Concrete or Asphalt Batch Plants: No concrete or asphalt batch plants will be
present on site.
Vehicle Tracking Control: A gravel/rock vehicle tracking control pad along with installed
cattle guards will be installed at the entrances to the site, as shown on the Grading and
Erosion Control Plan and per the Erosion Control Details (refer to Appendix A), prior to this
entrance being used. The adjacent roadways will be monitored and cleaned as necessary to
limit the tracking of sediment from the site by vehicles.
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• Waste Management and Control: Procedures for waste disposal will include placing the
waste in haul trucks/pickup trucks. The waste will then be removed from the site and
landfilled.
• Groundwater and Stormwater Dewatering: Any storm water that enters the excavation
areas will be removed from the excavation and routed through the BMPs to ensure that the
quality of the water that is discharged from the site is maintained. It is anticipated that there
will be discharges associated with dewatering groundwater from the excavation during
construction. A separate Construction Dewatering permit will be obtained from CDPHE. Any
groundwater that is discharged will be routed through the BMPs or treated as required by this
permit to ensure that the quality of the water that is discharged from the site is maintained.
The contractor is to update the above information with the exact locations of the concrete
washout, dumpsters, and portable toilets prior to the commencement of construction and updated as
necessary throughout the construction sequence.
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V. FINAL STABILIZATION AND LONG TERM STORMWATER MANAGEMENT
The final stabilization measures will include river bed and bank stabilization, landscaping, and
native seeding in all the areas that are disturbed during construction. Final stabilization shall be considered
achieved once all earth disturbing activities have been completed and vegetation is established. The
temporary erosion control measures can be removed when the vegetation coverage has reached
completion or the equivalent of the 70% of pre-disturbance levels.
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VI. INSPECTION AND MAINTENANCE
The BMP’s shall be maintained and kept in good repair for the duration of each phase of the
project until final stabilization. The SWMP Administrator or his designee shall inspect BMP’s at least every
seven days and immediately after any significant (greater than 0.1” precipitation) storm events that has
caused surface erosion. More frequent inspections may be required to ensure the BMPs are performing
acceptably. The maintenance and repair shall be completed in a timely manner. Sediment and debris shall
be removed when reaching half of the BMP height or impact the function of the BMP.
Record keeping shall be the contractor’s responsibility and inspection reports must become a
part of the SWMP. Records of spills, leaks, or overflows that result in the discharge of pollutants must
also be documented and recorded to become a part of the plan. Any release of a chemical, oil,
petroleum product, sewage, etc. which may enter a water of the State of Colorado must be reported the
State. The State of Colorado’s toll‐free 24‐hour environmental emergency spill reporting line is (877)
518‐5608 per the aforementioned Spill Response Plan.
6.1 City of Fort Collins Standard Erosion and Sediment Control Notes
1) The City Stormwater Department erosion control inspector must be notified at least 24
hours prior to any construction on this site.
2) All required BMPs shall be installed prior to any land disturbing activity (stockpiling,
stripping, grading, etc.). All of their required erosion control measures shall be installed
at the appropriate time in the construction sequence as indicated in the approved project
schedule, construction plans, and erosion control report.
3) Pre‐disturbance vegetation shall be 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.
4) All soils exposed during land disturbing activity (stripping, grading, stockpiling, filling, etc.)
shall be kept in a roughened condition by ripping or disking along land contours until
mulch, vegetation, or other permanent erosion control is installed. No soils in areas
outside project street rights of way shall remain exposed by land disturbing activity for
more than thirty (30) days before required temporary or permanent erosion control (e.g.
seed/mulch, landscaping, etc.) is installed, unless otherwise approved by the Stormwater
Department.
5) The project must be watered and maintained at all times during construction activities so
as to prevent wind‐caused erosion. All land disturbing activities shall be immediately
discontinued when fugitive dust impacts adjacent properties, as determined by the City
Engineering Department.
6) All temporary (structural) erosion control measures must be inspected and repaired or
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reconstructed as necessary after each runoff event and every 14 days in order to assure
continued 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.
7) No stockpile shall exceed ten (10) feet in height. All soil stockpiles shall be protected from
sediment transport by surface roughening, watering, and perimeter silt fencing. Any soil
stockpile remaining after 30 days shall be seeded and mulched.
8) City Ordinance prohibits the tracking, dropping, or depositing of soils or any other
material onto city streets by or from any vehicle. Any inadvertent deposited material shall
be cleaned immediately by the contractor.
6.2 City of Fort Collins Erosion Control Security Calculations
Pending review and approval of the erosion control plan proposed as part of this preliminary
report, costs associated with the proposed BMPs and revegetation of the site will be developed to
establish an erosion control escrow amount. This information will be provided as part of a revised/final
version of this report.
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VII. 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.
After this training, a certification that the employee or subcontractor’s employee is familiar with the
document and its procedures will be signed. 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.
COFC18.1 Erosion Control‐SWMP Report (June 6 2017).docx 19 Anderson Consulting Engineers, Inc.
VIII. REFERENCES
Anderson Consulting Engineers, Hydraulic Analysis for the Cache la Poudre River Between Linden Street
and the Lake Canal Diversion Dam (Prepared in Support of a Conditional Letter of Map Revision
for the Poudre River Whitewater Park), Draft, April 11, 2017.
Anderson Consulting Engineers and ECI, Drainage, Water Quality and Erosion Control Report for the
Poudre Whitewater Park Project, June 6, 2017
Biohabitats, Ecological Characterization Study of Poudre River Whitewater Park, November 2016.
Biohabitats, Poudre River Whitewater Park Ecological Characterization Study: Addendum for 101 East Vine
Drive (the Krush Property), January 2017.
City of Fort Collins, Stormwater Criteria Manual (Amendments to the Urban Drainage and Flood Control
District Manual), December 2011
City of Fort Collins Stormwater Construction Standards and Details
Earth Engineering Consultants, Inc., Subsurface Exploration Report, Proposed City of Fort Collins’ – Poudre
River Whitewater Park and Vine Drive Roadway Improvements, December 2016
Ecology and Environment, Inc., Application for Department of the Army Pert (33 CFR 25) Poudre River
Whitewater Park, Fort Collins, Colorado: Supplement to Engineering Form 4345, Final Draft, April
4, 2017
Walsh Environmental Scientists and Engineers, LLC, Phase I Environmental Site Assessment, Poudre River
Water Craft Course Property, Fort Collins, Co, June 4, 2017
Urban Drainage and Flood Control District, Urban Storm Drainage Criteria Manual, Volumes 1 and 2,
Updated January 2016, Volume 3 Updated November 2015.
APPENDIX A
BMP DETAILS
Anderson Consulting Engineers, Inc
Civil ▪ Water Resources ▪ Environmental
375 East Horsetooth Road, Building 5, Fort Collins, CO 80525
Phone (970) 226-0120 / Fax (970) 226-0121
www.acewater.com
34 D6
DETAIL SHEET (6 OF 7)
CITY OF FORT COLLINS
POUDRE RIVER
WHITEWATER PARK
FINAL DEVELOPMENT PLAN
APPROVED:
CITY ENGINEER DATE
CHECKED BY:
WATER & WASTEWATER UTILITY DATE
STORMWATER UTILITY DATE
PARKS & RECREATION DATE
TRAFFIC ENGINEER DATE
ENVIRONMENTAL PLANNER DATE
CHECKED BY:
CHECKED BY:
CHECKED BY:
CHECKED BY:
CITY OF FORT COLLINS, COLORADO
UTILITY PLAN APPROVAL
Drawn on: 3-16-11
Disclaimer:
The information presented herein is general design information only. For specific applications,
consult an independent professional for further design guidance.
STAPLE
PATTERN GUIDE
NOTES:
* Use ECMDS for more accurate
staple pattern selection.
2"-5"
(5-12.5cm)
3.3'
(1m)
6'
(1.8m)
3'
(0.9m)
4'
(1.2m)
1.6'
(0.5m)
2'
(0.6m)
10"
(25cm)
10"(25cm)
20"(0.5m)
0.7 Staples per SQ.YD. 1.15 Staples per SQ.YD.
1.7 Staples per SQ.YD. 3.4 Staples per SQ.YD. 3.75 Staples per SQ.YD.
4:1 Slopes (A)
3:1 Slopes (B)
2:1 Slopes (C)
1:1 & Steeper Slopes (D)
Medium/High Flow Channel (D)
High Flow Channel And
Shoreline (E)
Drawing Not To Scale
A B
C D E
2"-5"
(5-12.5cm)
2"-5"
(5-12.5cm)
2"-5"
(5-12.5cm)
2"-5"
(5-12.5cm)
2"-5"
(5-12.5cm)
2"-5"
(5-12.5cm)
2"-5"
(5-12.5cm)
6'
(1.8m)
3.3'
(1m)
3.3'
(1m)
3'
APPENDIX B
EROSION CONTROL PLAN
CACHE LA POUDRE RIVER
BNSF RAILROAD
CACHE LA POUDRE RIVER
COLLEGE AVENUE
UNION PACIFIC RAILROAD
LAKE CANAL
JEROME STREET
VINE DRIVE
COY DITCH
NOTES:
1.) ALL UNDISTURBED AREAS ARE INTENDED TO BE MAINTAINED IN A
NATIVE AND/OR DROUGHT TOLERANT LANDSCAPE. PLEASE SEE SECTION
3.4.1 OF THE LAND USE CODE FOR ALLOWABLE USES AND REQUIREMENTS
AND PROTECTING NATURAL FEATURES
2.) PROPERTY CORNER COORDINATES HAVE BEEN IDENTIFIED ON THE
SURVEY CONTROL SHEET FOR REFERENCE.
3.) SEE FLOODPLAIN PLAN FOR FLOODPLAIN INFORMATION
4.) PORTIONS OF THE PROJECT AREA ARE LOCATED IN THE FEMA
REGULATED 100-YEAR FLOODPLAIN OF THE CACHE LA POUDRE RIVER. ALL
DEVELOPMENT MUST SATISFY REQUIREMENTS OF CHAPTER 10 OF THE
CITY CODE.
5.) PRIOR TO BEGINNING ANY WORK IN THE FLOOD FRINGE, AN APPROVED
FLOODPLAIN USE PERMIT IS REQUIRED
6.) PERIMETER CONTROL ALONG NORTH AND SOUTH OF THE CACHE LA
POUDRE RIVER WILL BE PLACED ONCE SHEET PILE IS MOVED AND WILL
REMAIN UNTIL THE RIVER IS NOT AT RISK.
7.) ALL INLETS NOT SHOWN ON THIS PLAN WILL BE PROTECTED
ACCORDING TO CDOT SPECIFICATIONS
8.) ROCK SOCK PLACEMENT SHOWN IS NOT TO SCALE. APPROPRATE
PLACEMENT ALONG CURB AND GUTTER WILL BE USED
RS RS RS RS
IP
IP
IP-EL
IP-EL
IP IP
OP
OP
OP
OP
OP
OP
OP
IP
IP
IP-EL
ST
ST
ST
ECM
Anderson Consulting Engineers, Inc
Civil ▪ Water Resources ▪ Environmental
375 East Horsetooth Road, Building 5, Fort Collins, CO 80525
Phone (970) 226-0120 / Fax (970) 226-0121
www.acewater.com
27 C22
EROSION CONTROL PLAN
CITY OF FORT COLLINS
POUDRE RIVER
WHITEWATER PARK
APPENDIX C
CONSTRUCTION SEQUENCE
Mobilization Demolition Grading
Utilities
Installation
Flat Work/
Paving Installation
Vertical
Installation
Landscape Demobilization
Best Management Practices (BMPs)
Structural "Installation"
Sediment Trap*
Contour Furrows (Ripping/Disking)
Concrete Washout Structure*
Vehicle Tracking Pad*
Erosion Logs* Protect existing inlets/stormwater facilities
Wattles*
Inlet Filter Bags* Protect existing inlets/stormwater facilities
Aggregate Bags* Protect existing inlets/stormwater facilities
Terracing
Collecting Asphalt/Concrete Saw Cutting Waste
*All BMPs to be Removed Once Construction is Complete
Vegetative
Temporary Seeding Plantings Any time the site will be dormant longer than 30 days
Mulching/Sealant Any time the site will be dormant longer than 30 days
Permanent Seeding Planting
Sod Installation
Other:
CONSTRUCTION SEQUENCE CHART
FINAL DEVELOPMENT PLAN
APPROVED:
CITY ENGINEER DATE
CHECKED BY:
WATER & WASTEWATER UTILITY DATE
STORMWATER UTILITY DATE
PARKS & RECREATION DATE
TRAFFIC ENGINEER DATE
ENVIRONMENTAL PLANNER DATE
CHECKED BY:
CHECKED BY:
CHECKED BY:
CHECKED BY:
CITY OF FORT COLLINS, COLORADO
UTILITY PLAN APPROVAL
RS
IP
OP
IP-EL
ST
ECM
(0.9m)
3.3'
(1m)
3.3'
(1m)
3.3'
(1m)
1.6'
(0.5m)
4'
(1.2m)
4'
(1.2m)
2'
(0.6m)
2'
(0.6m)
20"(0.5m)
R
5401 St. Wendel - Cynthiana Rd.
Poseyville, IN 47633
PH: 800-722-2040
www.nagreen.com
CHANNEL
INSTALLATION
DETAIL
Drawing Not To Scale
1. Prepare soil before installing rolled
erosion control products (RECPs),
including any necessary application of
lime, fertilizer, and seed.
2. Begin at the top of the channel by
anchoring the RECPs in a 6"(15cm)
deep X 6"(15cm) wide trench with
approximately 12"(30cm) of RECPs
extended beyond the up-slope portion
of the trench. Use ShoreMax mat at the
channel/culvert outlet as supplemental
scour protection as needed. Anchor the
RECPs with a row of staples/stakes
approximately 12"(30cm) apart in the
bottom of the trench. Backfill and
compact the trench after stapling. Apply
seed to the compacted soil and fold the
remaining 12"(30cm) portion of RECPs
back over the seed and compacted soil.
Secure RECPs over compacted soil
with a row of staples/stakes spaced
approximately 12" apart across the
width of the RECPs.
3. Roll center RECPs in direction of water
flow in bottom of channel. RECPs will
unroll with appropriate side against the
soil surface. All RECPs must be
securely fastened to soil surface by
placing staples/stakes in appropriate
locations as shown in the staple pattern
guide.
4. Place consecutive RECPs end-over-end
(Shingle style) with a 4"-6" overlap. Use
a double row of staples staggered 4"
apart and 4" on center to secure
RECPs.
5. Full length edge of RECPs at top of side
slopes must be anchored with a row of
staples/stakes approximately 12"(30cm)
apart in a 6"(15cm) deep X 6"(15cm)
wide trench. Backfill and compact the
trench after stapling.
6. Adjacent RECPs must be overlapped
approximately 2"-5" (5-12.5cm)
(Depending on RECPs type) and
stapled.
7. In high flow channel applications a
staple check slot is recommended at 30
to 40 foot (9 -12m) intervals. Use a
double row of staples staggered
4"(10cm) apart and 4"(10cm) on center
over entire width of the channel.
8. The terminal end of the RECPs must be
anchored with a row of staples/stakes
approximately 12" (30cm) apart in a
6"(15cm) deep X 6"(15cm) wide trench.
Backfill and compact the trench after
stapling.
Drawn on: 3-16-11
Disclaimer:
The information presented herein is general design information only. For specific applications,
consult an independent professional for further design guidance.
2"-5"
(5-12.5cm)
6
2
4
12"(30cm)
6"
(15cm)
6"
(15cm)
4"-6"
(10-15cm)
8
6"
(15cm)
5 7
4"(10cm)
3
1
A
B
C
A
B C
NOTES:
*Horizontal staple spacing should be
altered if necessary to allow staples to
secure the critical points along the channel
surface.
**In loose soil conditions, the use of staple
or stake lengths greater than 6"(15cm) may
be necessary to properly secure the
RECP's.
CRITICAL POINTS
A. Overlaps and Seams
B. Projected Water Line
C. Channel Bottom/Side Slope Vertices
4"(10cm)
6"
(15cm)
5401 St. Wendel - Cynthiana Rd.
Poseyville, IN 47633
PH: 800-722-2040
www.nagreen.com
Anderson Consulting Engineers, Inc
Civil ▪ Water Resources ▪ Environmental
375 East Horsetooth Road, Building 5, Fort Collins, CO 80525
Phone (970) 226-0120 / Fax (970) 226-0121
www.acewater.com
35 D7
DETAIL SHEET (7 OF 7)
CITY OF FORT COLLINS
POUDRE RIVER
WHITEWATER PARK
FINAL DEVELOPMENT PLAN
APPROVED:
CITY ENGINEER DATE
CHECKED BY:
WATER & WASTEWATER UTILITY DATE
STORMWATER UTILITY DATE
PARKS & RECREATION DATE
TRAFFIC ENGINEER DATE
ENVIRONMENTAL PLANNER DATE
CHECKED BY:
CHECKED BY:
CHECKED BY:
CHECKED BY:
CITY OF FORT COLLINS, COLORADO
UTILITY PLAN APPROVAL