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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 COFC18.1 Erosion Control‐SWMP Report (June 6 2017).docx ii Anderson Consulting Engineers, Inc. TABLE OF CONTENTS (Continued) LIST OF APPENDICES Appendix A: BMP Details Appendix B: Erosion Control Plan Appendix C: Construction Sequence COFC18.1 Erosion Control‐SWMP Report (June 6 2017).docx 1 Anderson Consulting Engineers, Inc. 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. COFC18.1 Erosion Control‐SWMP Report (June 6 2017).docx 2 Anderson Consulting Engineers, Inc. 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 COFC18.1 Erosion Control‐SWMP Report (June 6 2017).docx 3 Anderson Consulting Engineers, Inc. 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. COFC18.1 Erosion Control‐SWMP Report (June 6 2017).docx 4 Anderson Consulting Engineers, Inc. Legend Project Area COFC18.1 Erosion Control‐SWMP Report (June 6 2017).docx 5 Anderson Consulting Engineers, Inc. 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. COFC18.1 Erosion Control‐SWMP Report (June 6 2017).docx 6 Anderson Consulting Engineers, Inc. 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. COFC18.1 Erosion Control‐SWMP Report (June 6 2017).docx 7 Anderson Consulting Engineers, Inc. 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. COFC18.1 Erosion Control‐SWMP Report (June 6 2017).docx 8 Anderson Consulting Engineers, Inc. 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. COFC18.1 Erosion Control‐SWMP Report (June 6 2017).docx 9 Anderson Consulting Engineers, Inc. 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. COFC18.1 Erosion Control‐SWMP Report (June 6 2017).docx 10 Anderson Consulting Engineers, Inc. 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. COFC18.1 Erosion Control‐SWMP Report (June 6 2017).docx 11 Anderson Consulting Engineers, Inc. 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. COFC18.1 Erosion Control‐SWMP Report (June 6 2017).docx 12 Anderson Consulting Engineers, Inc. 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. COFC18.1 Erosion Control‐SWMP Report (June 6 2017).docx 13 Anderson Consulting Engineers, Inc. 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. COFC18.1 Erosion Control-SWMP Report (June 6 2017).docx 14 Anderson Consulting Engineers, Inc. • 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. COFC18.1 Erosion Control-SWMP Report (June 6 2017).docx 15 Anderson Consulting Engineers, Inc. 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. COFC18.1 Erosion Control‐SWMP Report (June 6 2017).docx 16 Anderson Consulting Engineers, Inc. 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 COFC18.1 Erosion Control‐SWMP Report (June 6 2017).docx 17 Anderson Consulting Engineers, Inc. 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. COFC18.1 Erosion Control‐SWMP Report (June 6 2017).docx 18 Anderson Consulting Engineers, Inc. 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