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Home My WebLink AboutSEVEN GENERATIONS MULTIFAMILY - FDP230008 - SUBMITTAL DOCUMENTS - ROUND 2 - EROSION CONTROL LETTER/REPORT EROSION CONTROL REPORT FOR Seven Generations Multifamily Prepared by: Highland Development Services 6355 Fairgrounds Ave, Suite 100 Windsor, Colorado 80550 Phone: 970.674.7550 Prepared for: Black Timber Builders 1303 W. Swallow Road Fort Collins, CO 80525 Office: 970.282.7522 Owner/Developer: 3221 Eastbrook, LLC c/o Russel Baker 417 Jefferson St Fort Collins, CO 80524 April 19, 2023 Job Number 22-1057-00 6355 FAIRGROUNDS AVE, SUITE 100, WINDSOR, COLORADO 80550 | PHONE 970.674.7550 April 19, 2023 City of Fort Collins Utilities – Stormwater Department 700 Wood Street Fort Collins, CO 80522 RE: Erosion Control/Stormwater Management Plan for Seven Generations Multifamily Fort Collins Stormwater Department, We are pleased to submit for your review, this Erosion Control Report/Stormwater Management Plan for the Seven Generations Multifamily housing project. This report provides the City with an erosion control plan for the proposed development that addresses the topics outlined in the City Erosion Control Report Requirements. This plan mimics the State of Colorado General Permit and Stormwater Management Plan requirements. I appreciate your time and consideration in reviewing this submittal. Please call if you have any questions. Sincerely, Highland Development Services Zach Wiele Jason T. Claeys, P.E., LEED AP Page i TABLE OF CONTENTS Table of Contents ............................................................................................................................. i General Description and Location .................................................................................................. 1 Site Description and Location ...................................................................................................... 1 Site Soils ....................................................................................................................................... 2 Anticipated Permits ..................................................................................................................... 3 Sequence of Construction ........................................................................................................... 3 BMPs for Stormwater Pollution Prevention ................................................................................... 5 Erosion and Sediment Controls ................................................................................................... 5 Materials Handling and Spill Prevention ..................................................................................... 7 Stormwater Management Controls ................................................................................................ 9 SWMP Administrator ................................................................................................................... 9 Identification of Potential Pollution Sources ............................................................................... 9 Final Stabilization and Long-term Stormwater Management ...................................................... 11 Inspection and Maintenance ........................................................................................................ 12 SWMP Implementation................................................................................................................. 13 Appendix ....................................................................................................................................... 14 Appendix A – BMP Details ........................................................................................................... A Appendix B – Vicinity Map and Drainage & Erosion Control Plans ............................................. B Appendix C – Construction Sequence ......................................................................................... C Appendix D – Erosion Control Escrow Calculation ...................................................................... D Appendix E – Soil Information ..................................................................................................... E Appendix F – City of Fort Collins Standard Erosion Control Notes ..............................................F Page 1 GENERAL DESCRIPTION AND LOCATION SITE DESCRIPTION AND LOCATION The project site is situated in the southeast quarter of Section 30, Township 7 North, Range 68 West of the 6th Principal Meridian, City of Fort Collins, County of Larimer, in the State of Colorado. The property consists of Lot 2 and the south 85 feet of the west 410 feet of Lot 4 of the New Hampshire Subdivision, west of the intersection of Vermont Drive and Eastbrook Drive. It is bounded by open space owned by the City of Fort Collins to the north, Eastbrook Drive to the east, commercial development to the south, and the Union Pacific Railroad to the west. The site was previously developed as commercial office spaces with one building, the parking lot, and all of the utility infrastructure currently constructed. The total site, including the existing improvements and commercial office building is approximately 3.64 acres. The area of proposed redevelopment, approximately 1.28 acres, is currently unimproved and was originally approved with the Seven Generation Office Park for two additional commercial office buildings and plaza space. The Seven Generations Multifamily proposes to redevelop this area with the construction of a single 75-unit multifamily building and supporting access and plaza spaces. The existing infrastructure, parking and utilities, is to generally be protected in place and utilized to support the proposed redevelopment. The project site generally slopes from the southeast to the northwest at approximately 2% toward an existing water quality pond in the northwest corner of the property. The water quality pond was designed and constructed to support the previous commercial office development and is well established with vegetation. The intent is to protect the existing water quality pond and be utilized to provide water quality enhancement for the existing improvements. No wetlands are located within the area of proposed redevelopment. The project site is not located within the FEMA floodway or floodplain and is within the non- printed FEMA FIRM panel 08069C1000F, effective 12/19/2006. The site is within the City of Fort Collins Foothill Master Drainage Basin and the City 100-yr floodplain is located along the west and north sides of the property. The redevelopment area is outside of the City’s 100-yr floodplain. Due to the vicinity of the site to this floodplain, timing of the peak runoff, and proposed impervious area, on site detention was not required per the approval of the Seven Generations Office Park. The proposed redevelopment includes a single 75-unit multifamily building and plaza space that will provide the required emergency access. The existing improvements will generally be protected in place and will provide the required parking, utility services, and standard water 2 quality. A filtration gallery is proposed to provide additional stormwater quality enhancement and is intended to satisfy the low impact development (LID) requirement. The run-off coefficients associated with this project for onsite sub-basins are as follows: TRIBUTARY SUB-BASIN AREA (acres) RUNOFF COEFFIECENT C2 C100 1A 0.35 0.74 0.93 1B 0.99 0.83 1.00 1A+1B 1.33 0.81 1.00 2 1.72 0.73 0.92 1A+1B+2 3.05 0.77 0.96 3 0.83 0.45 0.56 Totals 3.88 0.70 0.87 The site was previously analyzed within the “Final Drainage and Erosion Control Report for Seven Generations Office,” prepared by Interwest Consulting Group, revised October 12, 2006. No outside sources of pollution currently exist on this site. Potential pollutant sources brought onto the site during construction will be discussed (along with spill prevention) below. The anticipated non-stormwater components of discharge with this project are landscape irrigation return flows. The existing storm infrastructure to convey runoff includes swales, inlets, and storm drainpipes. Stormwater water quality enhancement is achieved through the use of the existing water quality pond and the proposed Filtration Gallery. SITE SOILS The Seven Generations Multifamily redevelopment project site consists primarily of Nunn clay loam and a small portion of Fort Collins loam both classified as Type C hydrologic group. According to USDA/Natural Resource Conservation Group, Type C soils a have slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils also have a slow rate of water transmission. Per the “Preliminary Subsurface Exploration Report, 3400 Eastbrook Drive, Fort Collins, Colorado,” prepared by Earth Engineering Consultants, Inc. dated March 2, 2006: “A thin mantle of topsoil/vegetation was encountered at the surface at boring locations. The topsoil/vegetation was underlain by clayey sand and in boring B-1 and sandy lean clay in borings B-2 and B-3. The clayey sand and sandy lean clay showed low swell potential in laboratory testing at present moisture and density. The essentially granular soils extended to 3 the bottom of borings B-1 while moderately cohesive soils extended to depths of approximately 14 and 8 ft, respectively, in borings B-2 and B-3. The lean clay soils in boring B-2 and B-3 were underlain in poorly graded sand and gravel. The granular soils were loose to medium dense with cobbles observed with depth. The sand and gravel extended to the bottom of the borings at depths of approximately 15 feet below present site grades.” Groundwater was also observed during the subsurface soil exploration: “Observations were made while drilling and after completion of the borings to detect the presence and depth to the hydrostatic groundwater table. At the time of drilling, no free groundwater was observed in the test borings.” SOIL TYPE PERCENT OF SITE HYDROLOGIC SOIL GROUP1 K FACTOR2 WIND GROUP3 Fort Collins loam, 3-5% slopes 4.8% C 0.43 5 Nunn clay loam, 1-3% slopes 79.0% C 0.28 6 Nunn clay loam, wet, 1-3% slopes 16.2% C 0.24 6 1Hydrologic soil groups range from A to D with group A having a high infiltration rate and D having a very slow infiltration rate 2K factors range from 0.02 to 0.69. The higher value, the more susceptible the soil is to sheet and rill erosion by water. 3Soils assigned to wind group 1 are the most susceptible to wind erosion, soils assigned to wind group 8 are the least susceptible. Overall, the soils on site can be classified as moderately erodible and thus the project must implement an adequate erosion control strategy to control sediment migration from leaving the site. Please refer to Appendix E for the detailed on-site soil information from the NRCS Soil Survey of Larimer County. ANTICIPATED PERMITS Based on information determined and/or provided, the only permits needed outside of the City’s required permits is: - State of Colorado – Construction Stormwater Discharge Permits SEQUENCE OF CONSTRUCTION The anticipated sequence of construction shall progress as follows: 4 1) Installation of perimeter and offsite erosion control measures (mainly outlet protection at the detention pond outlet structures). Other measures as required for erosion control will be constructed throughout the project. 2) Clearing, stripping, stockpiling, and grading 3) Utility installation 4) Sub-grade preparation for the parking areas, drives and sidewalks 5) Curb, gutter, and sidewalks 6) Paving 7) Building construction (this may occur simultaneously with items 5 through 7) 8) Final grading and landscaping. All disturbed ground will be impervious (concrete, asphalt, or building), seeded and mulched, sodded or xeriscaped to permanently stabilize the site. 5 BMPS FOR STORMWATER POLLUTION PREVENTION EROSION AND SEDIMENT CONTROLS STRUCTURAL PRACTICES: Structural practices for the site will consist mainly of inlet protection, sediment control logs, and rock socks which are described in detail in the following paragraphs. Detail drawings of these BMPs are also included in Appendix A. These BMPs are expected to change as the construction progresses and it is the responsibility of the contractor to ensure appropriate BMPs are in place and/or removed at the appropriate time in the construction sequence. All temporary and permanent erosion and sediment control practices must be maintained and repaired as needed to assure continued performance of their intended function. All BMPs shall be inspected and repaired or replaced as described further in this report and as required to satisfy the conditions of the Permit. Refer to Erosion & Sedimentation Control Plans for detailed BMP sequencing and maintenance plans for the project through all stages of construction. Soil stockpiles, if required, should be kept below the locally mandated maximum height and surrounded with silt fencing or other acceptable means. If the storage of these soils is going to be for an extended period of time, then consider temporarily seeding the soil to minimize soil loss to wind and water erosion. Per the City of Fort Collins Stormwater Criteria Manual: No soil stockpile shall exceed ten (10) feet in height. All soil stockpiles shall be protected from sediment transport through the use of surface roughening, watering, and down gradient perimeter controls. All soil stockpiles shall be protected from sediment transport by wind in accordance with Municipal Code §12-150. All stockpiles shall be flattened to meet grade or removed from site as soon as practical, and no later than the completion of construction activities or abandonment of the project. All off-site stockpile storage locations in City limits shall have a stockpile permit from the City Engineering Department prior to using the area to store material. If frequent access from hardscape to the stockpile is needed a structural tracking Control Measure shall be implemented. Vehicle tracking pads are 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. Concrete washout area is intended to contain washout liquids and solids that result from the cleaning of concrete trucks and pumps. Washouts should be placed near the area where the concrete is being poured and 50 ft from any stormwater or drainage course. 6 Seven Generations Multifamily proposes to utilize a Filtration Gallery to provide water quality enhancement of the redevelopment area to satisfy the Low Impact Development requirements. Inlet protection is required at the inlet of the filtration gallery. Sediment accumulation will need to be observed throughout construction and during the establishment period and removed periodically to ensure no excessive sediment enters the gallery. Inlet protection, sediment control logs, and rock socks prevent sediment from entering storm drainage systems prior to permanent stabilization of the disturbed site area via ponding and settling of sediment. Sediment control logs, rock socks, or gravel bags shall be placed at existing and proposed inlets on and near the site as inlet protection. Inlet protection must be inspected and maintained after every rainfall event that produces runoff. Sediment must be removed and rocks replaced. Sediment control logs and rock socks will also be used as perimeter protection at the toe of slopes and landscaped areas. Sediment control logs and rock socks shall be installed immediately upon completion of over-lot grading. NON-STRUCTURAL PRACTICES: All low sloped areas exposed during land disturbing activity (stripping, grading, utility installations, stockpiling, filling, etc.) shall be kept in a roughened condition by ripping or disking along land contours until mulch, vegetation or other permanent erosion control is installed. All steep sloped areas exposed during land disturbing activity (stripping, grading, utility installations, stockpiling, filling, etc.) shall have slope protection. The contractor shall use a "tracked" vehicle, run perpendicular to slope so that the tracking runs on the contour to inhibit rill/gully erosion; the contractor may use other windrow-type methods as necessary. No soil shall remain exposed by land disturbing activity for more than thirty (30) days. At that time temporary or permanent erosion control seed/mulch, landscaping, etc. is required. Additional Non-Structural Practices are strongly encouraged such as minimizing the disturbance of soils and vegetation, providing educational materials on disposal /recycling, spill prevention / clean up, identification and elimination of illicit discharges, promotion of street sweeping and the development of public education programs. THE CONTRACTOR SHALL ADD ANY AND ALL BMP’S AND DETAILS NEEDED FOR SEDIMENT/EROSION CONTROL. 7 MATERIALS HANDLING AND SPILL PREVENTION Potential impacts from significant materials and their handling are as follows: Chemicals, cleaning substances, and petroleum products related to the construction will be stored within the construction trailer or storage shed where it will not be in contact with precipitation. No storage of these materials will be allowed outside. Fueling and maintenance of equipment shall take place at the construction staging area. Fueling will be accomplished with fueling trucks on an as needed basis. Absorbent (kitty litter) will be in the construction trailer and applied on any spill immediately and the dry material disposed of properly and legally. All construction waste shall be disposed of in the available dumpsters throughout the workday. Liquid wastes will be hauled off site and disposed of properly and legally. Any cleaning or maintenance of small equipment will be required to be done within a containment device (horse trough or small “kiddy pool”) and the liquid disposed of properly and legally. In the event of any spill, the SWMP Administrator shall be immediately notified. Spills can be broken into three categories. Their definitions and the procedures required to address the spills are as follow: MINOR SPILL – A spill generally of less than 5 gallons which is unlikely to reach adjacent waters (i.e. equipment leak). Procedure: a. Stop the source of the spill. b. Contain the spillage. c. Contact the SWMP Administrator. d. Clean up the spill with on-site absorbent material (kitty litter) e. Dispose of the dry material properly or legally. f. Document the spill and the response in the SWMP including dates and times – verify that the pollutants are completely cleaned up. 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. 8 b. Contain the spillage. c. Contact the SWMP Administrator. d. Clean up the spill with on-site absorbent material (kitty litter) e. Dispose of the dry material properly or legally. f. Document the spill and the response in the SWMP – verify that the pollutants are completely cleaned up. g. Notify the City of Fort Collins (970) 221-6700 and the Colorado Department of Public Health and Environment spill reporting line (877) 518-5608 of the spill. h. Notify the same two entities above with a written submission (outlined within the permit) within 5 calendar days. i. Include incident in the following training meeting. HAZARDOUS SPILL – A spill of a dangerous substance requiring expert cleanup. Procedure: a. Secure the area – do not approach the spill. b. Offer first aid to any injured parties. c. Call 911 and describe the nature of the spill and any injuries. d. If possible, isolate downstream areas from the spill (for example, cover an inlet that is downstream and a safe distance from the spill with plastic and soil). e. Contact the SWMP Administrator. f. Document the spill and the response in the SWMP g. Notify the City of Fort Collins (970) 221-6700 and the Colorado Department of Public Health and Environment spill reporting line (877) 518-5608 of the spill. h. Notify the same two entities above with a written submission (outlined within the permit) within 5 calendar days. i. Include incident in the following training meeting. 9 STORMWATER MANAGEMENT CONTROLS SWMP ADMINISTRATOR The Local Contact and SWMP Administrator is (INSERT CONTACT NAME, POSITION, COMPANY, and PHONE NUMBER). (INSERT CONTACT) will be responsible for developing, implementing, maintaining, and revising the SWMP. (INSERT CONTACT) will also be responsible for required inspections and coordinating and documenting changes or repairs resulting from inspections. (INSERT CONTACT) will be responsible for the training and enforcement aspects of the SWMP and he is the first point of contact for any stormwater issues. IDENTIFICATION OF POTENTIAL POLLUTION SOURCES The permit identifies 13 potential sources that must be evaluated for their potential to contribute pollutants to stormwater discharge. These items have been evaluated below for this project: 1. Disturbed and stored soil – YES – The construction will require that areas be disturbed exposing soil including foundation construction, paving and repaving, slope construction, and utility installation, and demolition required as shown on the plans. BMPs will include silt fence and sediment control logs and inlet protection on existing and proposed inlets, minimizing disturbance of existing vegetation and hard surfaces, and slope roughening and tracking of slopes after disturbance and prior to landscaping, paving, or building will be implemented. 2. Vehicle tracking of sediment – YES – The construction will require that subgrade be prepared for pavement and that vehicles drive on unpaved surfaces to the proposed buildings and utility improvement locations. BMPs will include a policy that vehicles be clean prior to entering the site and, if they become muddy during construction or earthwork activities, mud is removed by hand from the vehicle prior to departing the site in an area near the vehicle tracking pad. Any soil that is tracked from the site is to be disposed of in the trash dumpster by sweeping or scraping the material off the street. Any muddy vehicle will use the vehicle tracking pad prior to leaving the site. 3. Management of contaminated soil – NO – To our knowledge, there is not any existing soil contamination on-site. 4. Loading and unloading operations – YES – Chemicals and petroleum products will be brought to the site. Anytime these are being transported, they will be in a sealed container. 5. Outdoor storage activities – YES – Inert materials such as wood and stone will be stored outside and will likely be covered with tarps or plastic but are not pollutant sources and are not covered by the permit. Chemicals and petroleum 10 products will be stored within the construction trailer or storage shed. Cement and mortar bags (if not contained in a vehicle or storage shed) will be completely covered with plastic to avoid contact with precipitation. 6. Vehicle and equipment maintenance and fueling – YES – Vehicle maintenance and fueling, associated with construction of the proposed improvements, will take place. No fuel will be stored on site. 7. Significant dust or particulate generating processes – YES – Most of the site will be exposed from the over-lot grading of the project. In order to control the dust or particulate generating process a water truck or similar watering device will be available at all times. The disturbed ground will be watered as needed to control dust from leaving the site. The area of heavy construction is very limited and none of the operations are expected to generate significant dust. All dust control measures shall be completed in reference to the City’s Fugitive Dust Ordinance (Ordinance No. 044, 2016) and Dust Prevention and Control Manual. 8. Routine maintenance activities involving fertilizers, pesticides, detergents, fuels, solvents, oils, etc. – YES – Fertilizers and pesticides will not be used. Any cleaning or maintenance of small equipment will be required to be done within a containment device (horse trough or small “kiddy pool” and the liquid disposed of properly and legally. 9. On-site waste management – YES – The building and site construction will result in construction waste. A dumpster for trash and a dumpster for bulk recycling will be on the site. Waste will be hauled to the dumpsters by hand or in loaders. Dumpsters will be hauled off as needed. No construction waste will be left outside overnight without being located in a dumpster. No construction debris (including broken concrete) may be buried on the site. 10. Concrete truck/equipment washing – YES – A concrete washout will be provided on site. This will be used for trucks and for any masonry / concrete tools. 11. Dedicated asphalt of concrete batch plants – NO – None on this project. 12. Non-structural waste sources such as worker trash and portable toilets – YES – Trash dumpster will be available for worker’s trash and will be located near the construction trailer and emptied weekly. Portable toilets will be staked on site near the construction trailer. 13. Other areas where potential spills can occur – NO – The above 12 items are adequate for the anticipated construction process. THE CONTRACTOR IS TO UPDATE THE ABOVE INFORMATION WITH EXACT LOCATIONS OF THE CONSTRUCTION TRAILER, VEHICLE TRACKING PAD, CONCRETE WASHOUT, DUMPSTERS, AND PORTABLE TOILETS PRIOR TO COMMENCEMENT OF CONSTRUCTION AND UPDATE AS NECESSARY THROUGHOUT THE CONSTRUCTION SEQUENCE. 11 FINAL STABILIZATION AND LONG-TERM STORMWATER MANAGEMENT Soil amendments shall be provided and documented with city code section 12-132. The soil in all landscape areas shall be thoroughly loosened to a depth of not less than eight inches and soil amendment shall be thoroughly incorporated into the soil of all landscape areas to a depth of at least six inches by tilling, discing or other suitable method, at a rate of at least three cubic yards of soil amendment per one thousand square feet of landscape area. Prior to the issuance of any certificate of occupancy, a written certification must be submitted to the city that all planted areas, or areas to be planted, have been thoroughly loosened and the soil amended, consistent with the requirements set forth in section 12-132. All landscaping shall be installed according to sound horticultural practices to encourage successful establishment and healthy growth. Refer to the site and landscape plan for detailed instructions and estimated timelines. Final stabilization shall be considered achieved once all proposed site improvements are in place, all vegetation is established as identified on the site and landscape plan, all temporary BMPs are removed, and the downstream conveyances are inspected and certified to be clean and free from any construction debris resulting from the construction. No soils shall remain exposed by land disturbing activity for more than (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 temporary erosion control shall be implemented with or until temporary seeding or permanent erosion control can be performed. After stabilization, there are no other long term, permanent BMPs proposed within the site other than routine maintenance of the site (landscape mowing, permeable paver maintenance, pavement maintenance, etc.). 12 INSPECTION AND MAINTENANCE Site inspections will be performed to effectively address maintenance, repair, and adequacy of BMPs. The site inspections will be performed by the SWMP Administrator or his designee a minimum of once every fourteen (14) calendar days on active construction sites and within 24 hours after a significant storm event (event causing erosion). As part of the site inspections the inspector will keep documentation of all inspections and BMP maintenance, including updated Site Maps indicating new BMPs or the removal of BMPs since the previous inspection. Blank Site Maps will be utilized and will be redlined by the SWMP Administrator throughout construction to note all BMPs, pollutant sources, storage locations, etc. Any maintenance, repair, or necessary installation of BMPs that are noted during the inspection must begin immediately. The modifications shall be noted in the SWMP and the action taken as a result of the inspection shall be noted and certified on or attached to the original inspection report (date and time that the repair or change was started and finished and a certification that it was done properly). 13 SWMP IMPLEMENTATION It is the responsibility of the contractor to operate and maintain all facilities and systems of treatment and control which are installed to achieve compliance with the conditions of the permit. This includes effective performance, adequate funding, adequate staffing and training, etc. (see permit). All personnel on the construction site who will be in a position to affect or be affected by the SWMP shall be trained prior to beginning work. These individuals will be given general orientation information regarding the project and SWMP, shown where the SWMP is physically located, the SWMP will be explained to them and available for their review, and the enforcement policy will be reviewed. Throughout the construction, as a part of a weekly safety meeting, the SWMP will be reviewed with all attendees and any incidents discussed. All attendees shall be logged. 14 APPENDIX Appendix A – BMP Details Appendix B – Vicinity Map, Phasing Plan, and Drainage & Erosion Control Plans Appendix C – Construction Sequence Appendix D – Erosion Control Escrow Calculation Appendix E – Soil Information Appendix F – City of Fort Collins Standard Erosion Control Notes Appendix A APPENDIX A – BMP DETAILS Appendix B APPENDIX B – VICINITY MAP AND DRAINAGE & EROSION CONTROL PLANS Page i TABLE OF CONTENTS Table of Contents ............................................................................................................................. i General Description and Location .................................................................................................. 1 Site Description and Location ...................................................................................................... 1 Site Soils ....................................................................................................................................... 2 Anticipated Permits ..................................................................................................................... 3 Sequence of Construction ........................................................................................................... 3 BMPs for Stormwater Pollution Prevention ................................................................................... 5 Erosion and Sediment Controls ................................................................................................... 5 Materials Handling and Spill Prevention ..................................................................................... 7 Stormwater Management Controls ................................................................................................ 9 SWMP Administrator ................................................................................................................... 9 Identification of Potential Pollution Sources ............................................................................... 9 Final Stabilization and Long-term Stormwater Management ...................................................... 11 Inspection and Maintenance ........................................................................................................ 12 SWMP Implementation................................................................................................................. 13 Appendix ....................................................................................................................................... 14 Appendix A – BMP Details ........................................................................................................... A Appendix B – Vicinity Map and Drainage & Erosion Control Plans ............................................. B Appendix C – Construction Sequence ......................................................................................... C Appendix D – Erosion Control Escrow Calculation ...................................................................... D Appendix E – Soil Information ..................................................................................................... E Appendix F – City of Fort Collins Standard Erosion Control Notes ..............................................F Page 1 GENERAL DESCRIPTION AND LOCATION SITE DESCRIPTION AND LOCATION The project site is situated in the southeast quarter of Section 30, Township 7 North, Range 68 West of the 6th Principal Meridian, City of Fort Collins, County of Larimer, in the State of Colorado. The property consists of Lot 2 and the south 85 feet of the west 410 feet of Lot 4 of the New Hampshire Subdivision, west of the intersection of Vermont Drive and Eastbrook Drive. It is bounded by open space owned by the City of Fort Collins to the north, Eastbrook Drive to the east, commercial development to the south, and the Union Pacific Railroad to the west. The site was previously developed as commercial office spaces with one building, the parking lot, and all of the utility infrastructure currently constructed. The total site, including the existing improvements and commercial office building is approximately 3.64 acres. The area of proposed redevelopment, approximately 1.28 acres, is currently unimproved and was originally approved with the Seven Generation Office Park for two additional commercial office buildings and plaza space. The Seven Generations Multifamily proposes to redevelop this area with the construction of a single 75-unit multifamily building and supporting access and plaza spaces. The existing infrastructure, parking and utilities, is to generally be protected in place and utilized to support the proposed redevelopment. The project site generally slopes from the southeast to the northwest at approximately 2% toward an existing water quality pond in the northwest corner of the property. The water quality pond was designed and constructed to support the previous commercial office development and is well established with vegetation. The intent is to protect the existing water quality pond and be utilized to provide water quality enhancement for the existing improvements. No wetlands are located within the area of proposed redevelopment. The project site is not located within the FEMA floodway or floodplain and is within the non- printed FEMA FIRM panel 08069C1000F, effective 12/19/2006. The site is within the City of Fort Collins Foothill Master Drainage Basin and the City 100-yr floodplain is located along the west and north sides of the property. The redevelopment area is outside of the City’s 100-yr floodplain. Due to the vicinity of the site to this floodplain, timing of the peak runoff, and proposed impervious area, on site detention was not required per the approval of the Seven Generations Office Park. The proposed redevelopment includes a single 75-unit multifamily building and plaza space that will provide the required emergency access. The existing improvements will generally be protected in place and will provide the required parking, utility services, and standard water 2 quality. A filtration gallery is proposed to provide additional stormwater quality enhancement and is intended to satisfy the low impact development (LID) requirement. The run-off coefficients associated with this project for onsite sub-basins are as follows: TRIBUTARY SUB-BASIN AREA (acres) RUNOFF COEFFIECENT C2 C100 1A 0.35 0.74 0.93 1B 0.99 0.83 1.00 1A+1B 1.33 0.81 1.00 2 1.72 0.73 0.92 1A+1B+2 3.05 0.77 0.96 3 0.83 0.45 0.56 Totals 3.88 0.70 0.87 The site was previously analyzed within the “Final Drainage and Erosion Control Report for Seven Generations Office,” prepared by Interwest Consulting Group, revised October 12, 2006. No outside sources of pollution currently exist on this site. Potential pollutant sources brought onto the site during construction will be discussed (along with spill prevention) below. The anticipated non-stormwater components of discharge with this project are landscape irrigation return flows. The existing storm infrastructure to convey runoff includes swales, inlets, and storm drainpipes. Stormwater water quality enhancement is achieved through the use of the existing water quality pond and the proposed Filtration Gallery. SITE SOILS The Seven Generations Multifamily redevelopment project site consists primarily of Nunn clay loam and a small portion of Fort Collins loam both classified as Type C hydrologic group. According to USDA/Natural Resource Conservation Group, Type C soils a have slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils also have a slow rate of water transmission. Per the “Preliminary Subsurface Exploration Report, 3400 Eastbrook Drive, Fort Collins, Colorado,” prepared by Earth Engineering Consultants, Inc. dated March 2, 2006: “A thin mantle of topsoil/vegetation was encountered at the surface at boring locations. The topsoil/vegetation was underlain by clayey sand and in boring B-1 and sandy lean clay in borings B-2 and B-3. The clayey sand and sandy lean clay showed low swell potential in laboratory testing at present moisture and density. The essentially granular soils extended to 3 the bottom of borings B-1 while moderately cohesive soils extended to depths of approximately 14 and 8 ft, respectively, in borings B-2 and B-3. The lean clay soils in boring B-2 and B-3 were underlain in poorly graded sand and gravel. The granular soils were loose to medium dense with cobbles observed with depth. The sand and gravel extended to the bottom of the borings at depths of approximately 15 feet below present site grades.” Groundwater was also observed during the subsurface soil exploration: “Observations were made while drilling and after completion of the borings to detect the presence and depth to the hydrostatic groundwater table. At the time of drilling, no free groundwater was observed in the test borings.” SOIL TYPE PERCENT OF SITE HYDROLOGIC SOIL GROUP1 K FACTOR2 WIND GROUP3 Fort Collins loam, 3-5% slopes 4.8% C 0.43 5 Nunn clay loam, 1-3% slopes 79.0% C 0.28 6 Nunn clay loam, wet, 1-3% slopes 16.2% C 0.24 6 1Hydrologic soil groups range from A to D with group A having a high infiltration rate and D having a very slow infiltration rate 2K factors range from 0.02 to 0.69. The higher value, the more susceptible the soil is to sheet and rill erosion by water. 3Soils assigned to wind group 1 are the most susceptible to wind erosion, soils assigned to wind group 8 are the least susceptible. Overall, the soils on site can be classified as moderately erodible and thus the project must implement an adequate erosion control strategy to control sediment migration from leaving the site. Please refer to Appendix E for the detailed on-site soil information from the NRCS Soil Survey of Larimer County. ANTICIPATED PERMITS Based on information determined and/or provided, the only permits needed outside of the City’s required permits is: - State of Colorado – Construction Stormwater Discharge Permits SEQUENCE OF CONSTRUCTION The anticipated sequence of construction shall progress as follows: 4 1) Installation of perimeter and offsite erosion control measures (mainly outlet protection at the detention pond outlet structures). Other measures as required for erosion control will be constructed throughout the project. 2) Clearing, stripping, stockpiling, and grading 3) Utility installation 4) Sub-grade preparation for the parking areas, drives and sidewalks 5) Curb, gutter, and sidewalks 6) Paving 7) Building construction (this may occur simultaneously with items 5 through 7) 8) Final grading and landscaping. All disturbed ground will be impervious (concrete, asphalt, or building), seeded and mulched, sodded or xeriscaped to permanently stabilize the site. 5 BMPS FOR STORMWATER POLLUTION PREVENTION EROSION AND SEDIMENT CONTROLS STRUCTURAL PRACTICES: Structural practices for the site will consist mainly of inlet protection, sediment control logs, and rock socks which are described in detail in the following paragraphs. Detail drawings of these BMPs are also included in Appendix A. These BMPs are expected to change as the construction progresses and it is the responsibility of the contractor to ensure appropriate BMPs are in place and/or removed at the appropriate time in the construction sequence. All temporary and permanent erosion and sediment control practices must be maintained and repaired as needed to assure continued performance of their intended function. All BMPs shall be inspected and repaired or replaced as described further in this report and as required to satisfy the conditions of the Permit. Refer to Erosion & Sedimentation Control Plans for detailed BMP sequencing and maintenance plans for the project through all stages of construction. Soil stockpiles, if required, should be kept below the locally mandated maximum height and surrounded with silt fencing or other acceptable means. If the storage of these soils is going to be for an extended period of time, then consider temporarily seeding the soil to minimize soil loss to wind and water erosion. Per the City of Fort Collins Stormwater Criteria Manual: No soil stockpile shall exceed ten (10) feet in height. All soil stockpiles shall be protected from sediment transport through the use of surface roughening, watering, and down gradient perimeter controls. All soil stockpiles shall be protected from sediment transport by wind in accordance with Municipal Code §12-150. All stockpiles shall be flattened to meet grade or removed from site as soon as practical, and no later than the completion of construction activities or abandonment of the project. All off-site stockpile storage locations in City limits shall have a stockpile permit from the City Engineering Department prior to using the area to store material. If frequent access from hardscape to the stockpile is needed a structural tracking Control Measure shall be implemented. Vehicle tracking pads are 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. Concrete washout area is intended to contain washout liquids and solids that result from the cleaning of concrete trucks and pumps. Washouts should be placed near the area where the concrete is being poured and 50 ft from any stormwater or drainage course. 6 Seven Generations Multifamily proposes to utilize a Filtration Gallery to provide water quality enhancement of the redevelopment area to satisfy the Low Impact Development requirements. Inlet protection is required at the inlet of the filtration gallery. Sediment accumulation will need to be observed throughout construction and during the establishment period and removed periodically to ensure no excessive sediment enters the gallery. Inlet protection, sediment control logs, and rock socks prevent sediment from entering storm drainage systems prior to permanent stabilization of the disturbed site area via ponding and settling of sediment. Sediment control logs, rock socks, or gravel bags shall be placed at existing and proposed inlets on and near the site as inlet protection. Inlet protection must be inspected and maintained after every rainfall event that produces runoff. Sediment must be removed and rocks replaced. Sediment control logs and rock socks will also be used as perimeter protection at the toe of slopes and landscaped areas. Sediment control logs and rock socks shall be installed immediately upon completion of over-lot grading. NON-STRUCTURAL PRACTICES: All low sloped areas exposed during land disturbing activity (stripping, grading, utility installations, stockpiling, filling, etc.) shall be kept in a roughened condition by ripping or disking along land contours until mulch, vegetation or other permanent erosion control is installed. All steep sloped areas exposed during land disturbing activity (stripping, grading, utility installations, stockpiling, filling, etc.) shall have slope protection. The contractor shall use a "tracked" vehicle, run perpendicular to slope so that the tracking runs on the contour to inhibit rill/gully erosion; the contractor may use other windrow-type methods as necessary. No soil shall remain exposed by land disturbing activity for more than thirty (30) days. At that time temporary or permanent erosion control seed/mulch, landscaping, etc. is required. Additional Non-Structural Practices are strongly encouraged such as minimizing the disturbance of soils and vegetation, providing educational materials on disposal /recycling, spill prevention / clean up, identification and elimination of illicit discharges, promotion of street sweeping and the development of public education programs. THE CONTRACTOR SHALL ADD ANY AND ALL BMP’S AND DETAILS NEEDED FOR SEDIMENT/EROSION CONTROL. 7 MATERIALS HANDLING AND SPILL PREVENTION Potential impacts from significant materials and their handling are as follows: Chemicals, cleaning substances, and petroleum products related to the construction will be stored within the construction trailer or storage shed where it will not be in contact with precipitation. No storage of these materials will be allowed outside. Fueling and maintenance of equipment shall take place at the construction staging area. Fueling will be accomplished with fueling trucks on an as needed basis. Absorbent (kitty litter) will be in the construction trailer and applied on any spill immediately and the dry material disposed of properly and legally. All construction waste shall be disposed of in the available dumpsters throughout the workday. Liquid wastes will be hauled off site and disposed of properly and legally. Any cleaning or maintenance of small equipment will be required to be done within a containment device (horse trough or small “kiddy pool”) and the liquid disposed of properly and legally. In the event of any spill, the SWMP Administrator shall be immediately notified. Spills can be broken into three categories. Their definitions and the procedures required to address the spills are as follow: MINOR SPILL – A spill generally of less than 5 gallons which is unlikely to reach adjacent waters (i.e. equipment leak). Procedure: a. Stop the source of the spill. b. Contain the spillage. c. Contact the SWMP Administrator. d. Clean up the spill with on-site absorbent material (kitty litter) e. Dispose of the dry material properly or legally. f. Document the spill and the response in the SWMP including dates and times – verify that the pollutants are completely cleaned up. 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. 8 b. Contain the spillage. c. Contact the SWMP Administrator. d. Clean up the spill with on-site absorbent material (kitty litter) e. Dispose of the dry material properly or legally. f. Document the spill and the response in the SWMP – verify that the pollutants are completely cleaned up. g. Notify the City of Fort Collins (970) 221-6700 and the Colorado Department of Public Health and Environment spill reporting line (877) 518-5608 of the spill. h. Notify the same two entities above with a written submission (outlined within the permit) within 5 calendar days. i. Include incident in the following training meeting. HAZARDOUS SPILL – A spill of a dangerous substance requiring expert cleanup. Procedure: a. Secure the area – do not approach the spill. b. Offer first aid to any injured parties. c. Call 911 and describe the nature of the spill and any injuries. d. If possible, isolate downstream areas from the spill (for example, cover an inlet that is downstream and a safe distance from the spill with plastic and soil). e. Contact the SWMP Administrator. f. Document the spill and the response in the SWMP g. Notify the City of Fort Collins (970) 221-6700 and the Colorado Department of Public Health and Environment spill reporting line (877) 518-5608 of the spill. h. Notify the same two entities above with a written submission (outlined within the permit) within 5 calendar days. i. Include incident in the following training meeting. 9 STORMWATER MANAGEMENT CONTROLS SWMP ADMINISTRATOR The Local Contact and SWMP Administrator is (INSERT CONTACT NAME, POSITION, COMPANY, and PHONE NUMBER). (INSERT CONTACT) will be responsible for developing, implementing, maintaining, and revising the SWMP. (INSERT CONTACT) will also be responsible for required inspections and coordinating and documenting changes or repairs resulting from inspections. (INSERT CONTACT) will be responsible for the training and enforcement aspects of the SWMP and he is the first point of contact for any stormwater issues. IDENTIFICATION OF POTENTIAL POLLUTION SOURCES The permit identifies 13 potential sources that must be evaluated for their potential to contribute pollutants to stormwater discharge. These items have been evaluated below for this project: 1. Disturbed and stored soil – YES – The construction will require that areas be disturbed exposing soil including foundation construction, paving and repaving, slope construction, and utility installation, and demolition required as shown on the plans. BMPs will include silt fence and sediment control logs and inlet protection on existing and proposed inlets, minimizing disturbance of existing vegetation and hard surfaces, and slope roughening and tracking of slopes after disturbance and prior to landscaping, paving, or building will be implemented. 2. Vehicle tracking of sediment – YES – The construction will require that subgrade be prepared for pavement and that vehicles drive on unpaved surfaces to the proposed buildings and utility improvement locations. BMPs will include a policy that vehicles be clean prior to entering the site and, if they become muddy during construction or earthwork activities, mud is removed by hand from the vehicle prior to departing the site in an area near the vehicle tracking pad. Any soil that is tracked from the site is to be disposed of in the trash dumpster by sweeping or scraping the material off the street. Any muddy vehicle will use the vehicle tracking pad prior to leaving the site. 3. Management of contaminated soil – NO – To our knowledge, there is not any existing soil contamination on-site. 4. Loading and unloading operations – YES – Chemicals and petroleum products will be brought to the site. Anytime these are being transported, they will be in a sealed container. 5. Outdoor storage activities – YES – Inert materials such as wood and stone will be stored outside and will likely be covered with tarps or plastic but are not pollutant sources and are not covered by the permit. Chemicals and petroleum 10 products will be stored within the construction trailer or storage shed. Cement and mortar bags (if not contained in a vehicle or storage shed) will be completely covered with plastic to avoid contact with precipitation. 6. Vehicle and equipment maintenance and fueling – YES – Vehicle maintenance and fueling, associated with construction of the proposed improvements, will take place. No fuel will be stored on site. 7. Significant dust or particulate generating processes – YES – Most of the site will be exposed from the over-lot grading of the project. In order to control the dust or particulate generating process a water truck or similar watering device will be available at all times. The disturbed ground will be watered as needed to control dust from leaving the site. The area of heavy construction is very limited and none of the operations are expected to generate significant dust. All dust control measures shall be completed in reference to the City’s Fugitive Dust Ordinance (Ordinance No. 044, 2016) and Dust Prevention and Control Manual. 8. Routine maintenance activities involving fertilizers, pesticides, detergents, fuels, solvents, oils, etc. – YES – Fertilizers and pesticides will not be used. Any cleaning or maintenance of small equipment will be required to be done within a containment device (horse trough or small “kiddy pool” and the liquid disposed of properly and legally. 9. On-site waste management – YES – The building and site construction will result in construction waste. A dumpster for trash and a dumpster for bulk recycling will be on the site. Waste will be hauled to the dumpsters by hand or in loaders. Dumpsters will be hauled off as needed. No construction waste will be left outside overnight without being located in a dumpster. No construction debris (including broken concrete) may be buried on the site. 10. Concrete truck/equipment washing – YES – A concrete washout will be provided on site. This will be used for trucks and for any masonry / concrete tools. 11. Dedicated asphalt of concrete batch plants – NO – None on this project. 12. Non-structural waste sources such as worker trash and portable toilets – YES – Trash dumpster will be available for worker’s trash and will be located near the construction trailer and emptied weekly. Portable toilets will be staked on site near the construction trailer. 13. Other areas where potential spills can occur – NO – The above 12 items are adequate for the anticipated construction process. THE CONTRACTOR IS TO UPDATE THE ABOVE INFORMATION WITH EXACT LOCATIONS OF THE CONSTRUCTION TRAILER, VEHICLE TRACKING PAD, CONCRETE WASHOUT, DUMPSTERS, AND PORTABLE TOILETS PRIOR TO COMMENCEMENT OF CONSTRUCTION AND UPDATE AS NECESSARY THROUGHOUT THE CONSTRUCTION SEQUENCE. 11 FINAL STABILIZATION AND LONG-TERM STORMWATER MANAGEMENT Soil amendments shall be provided and documented with city code section 12-132. The soil in all landscape areas shall be thoroughly loosened to a depth of not less than eight inches and soil amendment shall be thoroughly incorporated into the soil of all landscape areas to a depth of at least six inches by tilling, discing or other suitable method, at a rate of at least three cubic yards of soil amendment per one thousand square feet of landscape area. Prior to the issuance of any certificate of occupancy, a written certification must be submitted to the city that all planted areas, or areas to be planted, have been thoroughly loosened and the soil amended, consistent with the requirements set forth in section 12-132. All landscaping shall be installed according to sound horticultural practices to encourage successful establishment and healthy growth. Refer to the site and landscape plan for detailed instructions and estimated timelines. Final stabilization shall be considered achieved once all proposed site improvements are in place, all vegetation is established as identified on the site and landscape plan, all temporary BMPs are removed, and the downstream conveyances are inspected and certified to be clean and free from any construction debris resulting from the construction. No soils shall remain exposed by land disturbing activity for more than (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 temporary erosion control shall be implemented with or until temporary seeding or permanent erosion control can be performed. After stabilization, there are no other long term, permanent BMPs proposed within the site other than routine maintenance of the site (landscape mowing, permeable paver maintenance, pavement maintenance, etc.). 12 INSPECTION AND MAINTENANCE Site inspections will be performed to effectively address maintenance, repair, and adequacy of BMPs. The site inspections will be performed by the SWMP Administrator or his designee a minimum of once every fourteen (14) calendar days on active construction sites and within 24 hours after a significant storm event (event causing erosion). As part of the site inspections the inspector will keep documentation of all inspections and BMP maintenance, including updated Site Maps indicating new BMPs or the removal of BMPs since the previous inspection. Blank Site Maps will be utilized and will be redlined by the SWMP Administrator throughout construction to note all BMPs, pollutant sources, storage locations, etc. Any maintenance, repair, or necessary installation of BMPs that are noted during the inspection must begin immediately. The modifications shall be noted in the SWMP and the action taken as a result of the inspection shall be noted and certified on or attached to the original inspection report (date and time that the repair or change was started and finished and a certification that it was done properly). 13 SWMP IMPLEMENTATION It is the responsibility of the contractor to operate and maintain all facilities and systems of treatment and control which are installed to achieve compliance with the conditions of the permit. This includes effective performance, adequate funding, adequate staffing and training, etc. (see permit). All personnel on the construction site who will be in a position to affect or be affected by the SWMP shall be trained prior to beginning work. These individuals will be given general orientation information regarding the project and SWMP, shown where the SWMP is physically located, the SWMP will be explained to them and available for their review, and the enforcement policy will be reviewed. Throughout the construction, as a part of a weekly safety meeting, the SWMP will be reviewed with all attendees and any incidents discussed. All attendees shall be logged. 14 APPENDIX Appendix A – BMP Details Appendix B – Vicinity Map, Phasing Plan, and Drainage & Erosion Control Plans Appendix C – Construction Sequence Appendix D – Erosion Control Escrow Calculation Appendix E – Soil Information Appendix F – City of Fort Collins Standard Erosion Control Notes Appendix A APPENDIX A – BMP DETAILS REVISIONNO.BYDATEHIGHLANDDEVELOPMENT SERVICES6355 FAIRGROUNDS AVENUE, SUITE 100 | WINDSOR, CO 80550PHONE: 970.674.7550 | EMAIL: Info@Highland-DS.com | www.Highland-DS.comPREPARED BY OR UNDER THE DIRECT SUPERVISION OF: FOR AND ON BEHALF OF HIGHLAND DEVELOPMENT SERVICES REVIEW SET NOT FOR CONSTRUCTION OFSHEET DRAWN BY CHECKED BY DATE SCALE (H) HDS PROJECT # SCALE (V)SEVEN GENERATIONS MULTIFAMILYEROSION CONTROL DETAILS4/19/23 NA N/A ZMW JTC 22-1057-00 C4.00 7 9 Appendix B APPENDIX B – VICINITY MAP AND DRAINAGE & EROSION CONTROL PLANS SITE E. DRAKE RD UNION PACIFIC RAILROADS. TIMBERLINE RDE. HORSETOOTH RDS. LEMAYAVEVicinity Map Scale: 1" = 1000' PROJECT DATUM: NAVD88 CITY OF FORT COLLINS BENCHMARK #43-01 EAST SIDE OF TIMBERLINE ROAD, AT THE SOUTH ENTRANCE TO C.S.U. RIGDEN FARM, ON THE NORTH END OF THE HEAD WALL OF A STORM DITCH ELEV= 4937.02 CITY OF FORT COLLINS BENCHMARK #12-93 NORTHWEST CORNER OF HORSETOOTH ROAD AND TIMBERLINE ROAD, ON A SIGNAL POLE BASE ELEV= 4957.08 PLEASE NOTE: THIS PLAN SET IS USING NAVD88 FOR A VERTICAL DATUM. SURROUNDING DEVELOPMENTS HAVE USED NGVD29 UNADJUSTED DATUM (PRIOR CITY OF FORT COLLINS DATUM) FOR THEIR VERTICAL DATUMS. IF NGVD29 UNADJUSTED DATUM (PRIOR CITY OF FORT COLLINS DATUM) IS REQUIRED FOR ANY PURPOSE, THE FOLLOWING EQUATIONS SHOULD BE USED: NGVD29 UNADJUSTED DATUM (PRIOR CITY OF FORT COLLINS DATUM) = 4937.02 (NAVD88 DATUM) - 3.18' NGVD29 UNADJUSTED DATUM (PRIOR CITY OF FORT COLLINS DATUM) = 4957.08 (NAVD88 DATUM) - 3.19' NYLOPLAST DUCTILE IRONDO NOT POLLUTE DRAINS TO WATERWAYS NYLOPLAST DUCTILE IRON DO NOT POLLUTE DRAINS TO WATERWAYS NYLOPLAST DUCTILE IRON DO NOT POLLUTE DRAINS TO WATERWAYS 100-YR FP 100-YR FP100-YR FPVERMONT DRIVE (54' ROW)EASTBROOK DRIVE(54' ROW)LOT 1 NEW HAMPSHIRE SUBDIVISION EXISTING COMMERCIAL BUILDING FFE = 4950.70 SEVEN GENERATIONS MULTIFAMILY BUILDING FFE = 4952.25UNION PACIFIC RAILROADTRACT A TIMBERLINE VILLAGE PUD (City of Fort Collins) (U&DE) APPROX LIMITS OF REDEVELOPMENT AREA & DISTURBED AREA 56,500± SQFT (1.30± ACRES) FILTRATION GALLERY 40~SC-160LP STORMTECH CHAMBERS EXISTING STANDARD WATER QUALITY POND EX TRASH ENCLOSURE (MODIFIED)REVISIONNO.BYDATEHIGHLANDDEVELOPMENT SERVICES6355 FAIRGROUNDS AVENUE, SUITE 100 | WINDSOR, CO 80550PHONE: 970.674.7550 | EMAIL: Info@Highland-DS.com | www.Highland-DS.comPREPARED BY OR UNDER THE DIRECT SUPERVISION OF: FOR AND ON BEHALF OF HIGHLAND DEVELOPMENT SERVICES REVIEW SET NOT FOR CONSTRUCTION OFSHEET DRAWN BY CHECKED BY DATE SCALE (H) HDS PROJECT # SCALE (V)SEVEN GENERATIONS MULTIFAMILYDRAINAGE & EROSION CONTROL PLAN4/19/23 1" = 20' N/A JTC JTC 22-1057-00 C2.00 4 9 CALL UTILITY NOTIFICATION CENTER OF COLORADO CALL 2-BUSINESS DAYS IN ADVANCE BEFORE YOU DIG, GRADE OR EXCAVATE FOR THE MARKING OF UNDERGROUND MEMBER UTILITIES. before you dig.CallKnow what's below. R N W E S 0 SCALE: 1" = 20' 40201020 BASIN COEFFICIENT (100-YR) BASIN DESIGNATION BASIN AREA DESIGN POINT DRAINAGE FLOW ARROW DRAINAGE BASIN BOUNDARY DRAINAGE BASIN FLOW PATH LEGEND EXISTING MAJOR CONTOUR EXISTING MINOR CONTOUR PROPOSED MAJOR CONTOUR PROPOSED MINOR CONTOUR ROCK SOCK INLET PROTECTION SEDIMENT CONTROL LOG CONCRETE WASHOUT AREA NOTES 1.THE NATURAL HABITAT BUFFER ZONE (NHBZ) IS INTENDED TO BE MAINTAINED IN A NATIVE LANDSCAPE. PLEASE SEE SECTION 3.4.1 OF THE LAND USE CODE FOR ALLOWABLE USES WITHIN THE NATURAL HABITAT BUFFER ZONE. 2.CONTRACTOR TO PROVIDE AND MAINTAIN ALL NECESSARY EROSION CONTROL MEASURES PRIOR TO AND THROUGHOUT CONSTRUCTION. PLACE EROSION CONTROL PROTECTION AT ALL EXISTING INLETS DOWNSTREAM FROM THE CONSTRUCTION AREA. EROSION CONTROL PROTECTION SHALL REMAIN IN PLACE UNTIL CONSTRUCTION IS COMPLETE AND ALL DISTURBED GROUND IS ADEQUATELY VEGETATED WITH OWNER'S APPROVAL FOR REMOVAL. 3.THE EXTENT OF EROSION CONTROL PROTECTION SHALL BE OBSERVED AND ADJUSTED AS NEEDED DURING CONSTRUCTION BASED ON SITE CONDITIONS AND THE PERFORMANCE OF THE EROSION CONTROL CONTROL MEASURES SHOWN, TO SUPPLY SUFFICIENT EROSION CONTROL AND MINIMIZE DOWNSTREAM WATERWAY POLLUTION. 4.LIMIT DISTURBANCE TO AREAS WITHIN EROSION CONTROL BOUNDARIES. ADJUST EROSION CONTROL BOUNDARIES AS NECESSARY TO ADEQUATELY COMPLETE PROPOSED WORK. ALL DISTURBED AREAS SHALL BE PREPARED (SEEDED & MULCHED, SURFACE ROUGHENING, ETC.) TO MINIMIZE EROSION POTENTIAL AND SOIL MIGRATION. 5.STORMWATER MANAGEMENT PLAN SHALL BE PREPARED AND SUBMITTED BY CONTRACTOR PRIOR TO CONSTRUCTION COMMENCEMENT. 6.SEE LANDSCAPE PLAN FOR REVEGETATION METHODS AND DETAILS. DURING CONSTRUCTION, ANY SOIL DISTURBED AND NOT UNDER ACTIVE CONSTRUCTION SHALL BE SEEDED AND MULCHED PER CITY STANDARDS. 7.ANY DISTURBED LAND MUST RECEIVE SURFACE ROUGHENING, INCLUDING BUT NOT LIMITED TO SLOPED AREAS. 8.NO VEHICULAR TRAFFIC IS ANTICIPATED IN/OUT OF THE REDEVELOPMENT AREA DURING CONSTRUCTION. ALL CONSTRUCTION VEHICLES ARE TO STAGE WITHIN THE EXISTING SITE PARKING LOT. 9.REFERENCE SEVEN GENERATIONS MULTIFAMILY DRAINAGE REPORT. 10.REFERENCE SHEET 7 FOR EROSION CONTROL DETAILS. CONSTRUCTION ENTRANCE W/ VEHICLE TRACKING CONTROL APPROX LIMIT OF REDEVELOPMENT SILT FENCE Appendix C APPENDIX C – CONSTRUCTION SEQUENCE (Construction Phases) Mobilization Demolition GradingUtilities InstallationFlat work InstallationVertical Installation Landscape DemobilizationBest Management Practices (BMPs)Structural "Installation"Silt Fence Barriers*Contour Furrows (Ripping / Disking)Sediment Trap / Filter*Vehicle Tracking Pad*Flow BarriersInlet protection*Any prior inlets that could use protectingRock Bags*Any prior inlets that could use protectingTerracingRip RapCollecting Asphalt / Concrete Saw Cutting Waste*All BMPs to be Removed once Construction is Complete,with the exception of silt fencing, which shall remain in place until seeded areas are established.VegetativeTemporary Seeding PlantingAny time the site will sit dorment longer than 30 Days.Mulching/SealantAny time the site will sit dorment longer than 30 Days.Permanent Seeding PlantingSod InstallationRolled Products : Netting/Blankets/MatsAny time the site will sit dorment longer than 30 Days. Appendix D APPENDIX D – EROSION CONTROL ESCROW CALCULATION 4/18/2023 Project: Disturbed Acres:1.30 EROSION CONTROL BMPs Units Estimated Quantity Unit Price Total Price L.F. 266 $2.50 $665.00 each 12 $150.00 $1,800.00 L.F. 301 $2.00 $602.00 each 1 $500.00 $500.00 each 1 $300.00 $300.00 each 0 $800.00 $0.00 LS 1 $2,500.00 $2,500.00 Sub-Total: $6,367.00 1.5 x Sub-Total: $9,550.50 Amount of security: $9,550.50 AC 1.30 $2,000.00 $2,600.00 Sub-Total: $2,600.00 1.5 x Sub-Total: $3,900.00 Amount to Re-seed: $3,900.00 Minimum escrow amount: $3,000.00 Erosion Control Escrow:$9,550.50 Erosion and Sediment Control Escrow/Security Calculation for The City of Fort Collins Seven Generations Multifamily BMP Amount Silt Fence Rock Sock Sediment Control Log Seeding Miniumum Escrow Amount Final Escrow Amount (Maximum between BMP, Reseeding and Minimum Escrow) “The amount of the security must be based on one and one-half times the estimate of the cost to install the approved measures, or one and one-half times the cost to re-vegetate the disturbed land to dry land grasses based upon unit cost determined by the City's Annual Revegetation and Stabilization Bid, whichever is greater. In no instance, will the amount of security be less than one thousand five hundred dollars ($1,500) for residential development or three thousand dollars ($3,000) for commercial development” Vehicle Tracking Control Pad Inlet Protection Outlet Protection Street Sweeping and Cleaning Reseeding Amount 4/18/2023 1:38 PM G:\Projects\22-1057-00 Seven Gen (FC)\03 Design Documents\Drainage\Erosion Control\22-1057-00 - Erosion Control Escrow.xls Appendix E APPENDIX E – SOIL INFORMATION Hydrologic Soil Group—Larimer County Area, Colorado (Seven Generations) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/6/2022 Page 1 of 44487940448796044879804488000448802044880404488060448808044879404487960448798044880004488020448804044880604488080496300496320496340496360496380496400496420496440496460496480496500496520 496300 496320 496340 496360 496380 496400 496420 496440 496460 496480 496500 496520 40° 32' 36'' N 105° 2' 37'' W40° 32' 36'' N105° 2' 27'' W40° 32' 31'' N 105° 2' 37'' W40° 32' 31'' N 105° 2' 27'' WN Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84 0 45 90 180 270 Feet 0 10 20 40 60 Meters Map Scale: 1:1,010 if printed on A landscape (11" x 8.5") sheet. Soil Map may not be valid at this scale. MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Rating Polygons A A/D B B/D C C/D D Not rated or not available Soil Rating Lines A A/D B B/D C C/D D Not rated or not available Soil Rating Points A A/D B B/D C C/D D Not rated or not available Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography The soil surveys that comprise your AOI were mapped at 1:24,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: Larimer County Area, Colorado Survey Area Data: Version 16, Sep 2, 2021 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Jul 2, 2021—Aug 25, 2021 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. Hydrologic Soil Group—Larimer County Area, Colorado (Seven Generations) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/6/2022 Page 2 of 4 Hydrologic Soil Group Map unit symbol Map unit name Rating Acres in AOI Percent of AOI 36 Fort Collins loam, 3 to 5 percent slopes C 0.2 4.8% 74 Nunn clay loam, 1 to 3 percent slopes C 3.7 79.0% 76 Nunn clay loam, wet, 1 to 3 percent slopes C 0.8 16.2% Totals for Area of Interest 4.6 100.0% Description Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long-duration storms. The soils in the United States are assigned to four groups (A, B, C, and D) and three dual classes (A/D, B/D, and C/D). The groups are defined as follows: Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission. Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink-swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for drained areas and the second is for undrained areas. Only the soils that in their natural condition are in group D are assigned to dual classes. Hydrologic Soil Group—Larimer County Area, Colorado Seven Generations Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/6/2022 Page 3 of 4 Rating Options Aggregation Method: Dominant Condition Component Percent Cutoff: None Specified Tie-break Rule: Higher Hydrologic Soil Group—Larimer County Area, Colorado Seven Generations Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/6/2022 Page 4 of 4 Appendix F APPENDIX F – CITY OF FORT COLLINS STANDARD EROSION CONTROL NOTES Appendix F: Construction Control Measures Standard Notes FORT COLLINS STORMWATER CRITERIA MANUAL Appendix F Page 1 General Erosion Control Requirements These notes are a summary for the legal requirements, that are set forth in the Fort Collins Stormwater Criteria Manual (FCSCM), and that any conflict is resolved by the more stringent requirement controlling. 1) The Property Owner, Owner’s Representative, Developer, Design Engineer, General Contractor, Sub-contractors, or similar title for the developing entity (here after referred to as the Developer) has provided these Erosion Control Materials in accordance with Erosion Control Criteria set forth in the Manual as an attempt to identify erosion, sediment, and other potential pollutant sources associated with these Construction Activities and preventing those pollutants from leaving the project site as an illicit discharge. Full City requirements and are outlined and clarified in the Manual under Chapter 4: Construction Control Measures and should be used to identify and define what is needed on a project. 2) The Developer shall make themselves thoroughly familiar with the provisions and the content of the specifications laid out in the Manual, the Development Agreement, the Erosion Control Materials compiled for this project, and the following notes as all these materials are applicable to this project. 3) The Developer shall implement and maintain Control Measures for all potential pollutants from the start of land disturbing activities until final stabilization of the construction site. 4) The City Erosion Control Inspector shall be notified at least twenty-four (24) hours prior to the desired start of any construction activities on this site to allow adequate time for on-site confirmation (initial inspection which can take up to two business days after receiving the request) that the site is in fact protected from sediment and pollutants discharges off site. Please contact erosion@fcgov.com early to schedule those Initial Erosion Control Inspections well in advance so that demolition, clearing, grubbing, tree removal, and scraping may begin without delay. Failure to receive an on-site confirmation before construction activities commence is an automatic “Notice of Violation” and can result in further enforcement actions. 5) The Developer shall proactively provide all appropriate Control Measures to prevent damage to adjacent downstream and leeward properties. This includes but is not limited to: trees, shrubs, lawns, walks, pavements, roadways, structures, creeks, wetlands, streams, rivers, and utilities that are not designed for removal, relocation, or replacement in the course of construction. 6) At all times the Developer shall be responsible to ensure adequate Control Measures are designed, selected, installed, maintain, repaired, replaced, and ultimately removed in order Standard Erosion Control Notes FORT COLLINS STORMWATER CRITERIA MANUAL Appendix F Page 2 to prevent and control erosion suspension, sediment transportation, and pollutant discharge as a result of construction activities associated with this project. 7) All applicable Control Measures based upon the sequencing and/or phasing of the project shall be installed prior to those construction activities commencing. 8) As dynamic conditions (due to the nature, timing, sequence, and phasing of construction) in the field may warrant Control Measures in addition, or different, to what is shown on these plans, the Developer shall at all times be responsible to implement the Control Measures that are most effective with the current state and progress of construction. The Developer shall implement whatever measures are determined necessary, and/or as directed by the City Erosion Control Inspector. The Developer shall insure that all Erosion Control Plans (Maps) or SWMP documents are updated to reflect the current site conditions, with updates being initialed and dated. These site inspections and site condition updates shall be made available upon request by the City. 9) All listings, provisions, materials, procedures, activities, site work and the like articulated in this or other written site-specific documents (Including but not limited to the erosion control reports, development agreements, landscape, and drainage materials) shall meet or exceed the most restrictive language for City, County, State, and Federal regulations with regards to erosion, sediment, pollutant, and other pollution source Control Measures. The Developer shall be responsible to comply with all of these aforementioned laws and regulations. 10) The Developer shall ensure that all appropriate permits (CDPS General Permit Stormwater Discharges Associated with Construction Activity, Dewatering, Clean Water Act, Army Corps of Engineers’ 404 Wetlands Mitigation Permit, etc.) have been attained prior to the relevant activity has begun. These permits or copies shall be made available upon request by the City. 11) The Developer shall furnish all conveniences and assistances to aid the Erosion Control Inspectors of materials, workmanship, records, and self-inspections, etc. of the Control Measures involved in the construction activities. 12) The Developer shall request clarification of all apparent site construction issues that may arise due to inconsistencies in construction plans for the site or site conditions around the selected Control Measures by contacting the Erosion Control Inspector. The Erosion Control Inspector will not be responsible for any explanations, interpretations, or supplementary data provided by others. 13) All Control Measures shall be installed in accordance with the Manual. 14) The City reserves the right to require additional Control Measures as site conditions warrant, to the extent authorized by relevant legal authority. 15) As with any construction standards, occasions may arise where the minimum erosion control standards are either inappropriate or cannot be justified. In these cases, a variance to these FORT COLLINS STORMWATER CRITERIA MANUAL Appendix F Page 3 standards may be applied for pursuant to the terms, conditions, and procedures of the Manual. 16) Inspection. The contractor shall inspect site pollutant sources and implement Control Measures at a minimum of once every two weeks during construction and within 24 hours following a precipitation event. Documentation of each inspection shall be recorded and retained by the contractor. 17) All temporary Control Measures shall be cleaned, repaired, or reconstructed as necessary in order to assure continual performance of their intended function. All retained sediments, particularly those on paved roadway surfaces, shall be removed and disposed of in a manner and location so as not to cause their release into any drainage way. 18) Any Control Measure may be substituted for another standard Control Measure so long as that Control Measure is equal to, or of greater protection than the original Control Measure that was to be used in that location. (ex. silt fence, for wattles, or for compact berms) Wattle alone on commercial construction sites have shown to be an ineffective substitute for silt fence or compact berms unless it is accompanied by a construction fence to prevent vehicle traffic. 19) Any implementation or replacement of existing Control Measures for a non-standard control, or alternative Control Measure, shall require the review and acceptance by the City erosion control staff before the measure will be allowed to be used on this project. These Control Measures’ details shall be submitted, reviewed and accepted to be in accordance with the Erosion Control Criteria based upon the functionality and effectiveness in accordance with sound engineering and hydrological practices Land disturbance, Stockpiles, and Storage of Soils 20) There shall be no earth-disturbing activity outside the limits designated on the accepted plans. Off road staging areas or stockpiles must be preapproved by the City. Disturbances beyond these limits will be restored to original condition. 21) Pre-disturbance vegetation shall be identified, protected, and retained wherever possible. Removal or disturbance of existing vegetation shall be limited to the area required for immediate construction operations, and for the shortest practical period of time. This should include sequencing and phasing construction activities in a way so that the soil is not exposed for long periods of time by schedule or limit grading to small areas. This should also include when practical advancing the schedule on stabilization activities such that landscaping takes place shortly if not immediately after grading has occurred. Vegetation efforts shall start as soon as possible to return the site to a stabilized condition. Sensitive areas should avoid clearing and grading activities as much possible. FORT COLLINS STORMWATER CRITERIA MANUAL Appendix F Page 4 22) All exposed soils or disturbed areas are considered a potential pollutant and shall have Control Measures implemented on the site to prevent materials from leaving the site. 23) All soils exposed during land disturbing activity (stripping, grading, utility installations, stockpiling, filling, etc.) shall be kept in a roughened condition at all times by equipment tracking, scarifying or disking the surface on a contour with a 2 to 4 inch minimum variation in soil surface until mulch, vegetation, and/or other permanent erosion control is installed. 24) No soil stockpile shall exceed ten (10) feet in height. All soil stockpiles shall be protected from sediment transport through the use of surface roughening, watering, and down gradient perimeter controls. All soil stockpiles shall be protected from sediment transport by wind in accordance with Municipal Code §12-150. All stockpiles shall be flattened to meet grade or removed from site as soon as practical, and no later than the completion of construction activities or abandonment of the project. All off-site stockpile storage locations in City limits shall have a stockpile permit from the City Engineering Department prior to using the area to store material. If frequent access from hardscape to the stockpile is needed a structural tracking Control Measure shall be implemented. 25) All required Control Measures shall be installed prior to any land disturbing activity (stockpiling, stripping, grading, etc.). All of the required erosion Control Measures must be installed at the appropriate time in the construction sequence as indicated in the approved project schedule, construction plans, and erosion control report. 26) All inlets, curb-cuts, culverts, and other storm sewer infrastructure which could be potentially impacted by construction activities shall be protected with Control Measures. Material accumulated from this Control Measure shall be promptly removed and in cases where the protection has failed, the pipes shall be thoroughly cleaned out. 27) All streams, stream corridors, buffers, woodlands, wetlands, or other sensitive areas shall be protected from impact by any construction activity through the use of Control Measures. 28) All exposed dirt shall have perimeter control. Any perimeter controls that drain off or has the ability to be tracked onto the nearby hardscape shall have some form of effective sediment control as the, or as part of the, perimeter control. 29) All exposed slopes should be protected. All exposed steep slopes (Steeper than 3:1 H:V) shall be protected from erosion and sediment transport through use of Control Measures. 30) No soils shall remain exposed by land disturbing activity for more than thirty (30) days after activity has ceased before required temporary seeding or permanent erosion control (e.g. seed/mulch, landscaping, etc.) is installed. This is not just limited to projects that are abandoned; this includes any project that is temporarily halted and no immediate activity is to resume within the next thirty (30) days, unless otherwise approved by the City Erosion Control Inspector. During a season when seeding does not produce vegetative cover, another FORT COLLINS STORMWATER CRITERIA MANUAL Appendix F Page 5 temporary erosion control shall be implemented with or until temporary seeding or permanent erosion control can be performed. 31) All individual lots shall have effective sediment controls located on the street side and any down gradient side. Typically most lots drain to the front yet on those cases where houses are along a pond or drainage swale have the lot drain in a different direction than the street, those individual lots will need protection on that down gradient side to prevent sediment from leaving the lot. See the Individual Lot Details for further clarification. Vehicle Tracking 32) At all points where vehicles exit or leave the exposed dirt area on to a hardscape or semi hardscape (concrete, asphalt, road base, etc.) shall have installed at least one structural tracking Control Measure to prevent vehicle tracking. All areas not protected by an adequate perimeter control shall be considered a point where vehicles exit the site. Access points should be limited to as few entrances as possible (All perimeter areas shall be protected from tracking activities). 33) In all areas that the structural tracking Control Measures fail to prevent vehicle tracking, collection and proper disposal of that material is required. All inlets located near access points and affected by tracking activities shall be prevented from the introduction of sediment into the drainage system. 34) City Municipal Code §20-62, among other things, prohibits the tracking, dropping, or depositing of soils or any other material onto city streets by or from any source. City Municipal Code, §26-498, among other things, prohibits the discharge of pollutants on public or private property if there is a significant potential for migration of such pollutant. Therefore, all tracked or deposited materials (intentional or inadvertent) are not permitted to remain on the street or gutter and shall be removed and legally disposed of by the Developer in a timely and immediate manner. Dirt ramps installed in the curb-lines are not exempt to these sections of code and shall not be permitted in the street right of way (public or private). 35) If repeated deposit of material occurs on a site, additional structural tracking controls may be required of the Developer by the City Erosion Control Inspector. Loading and Unloading Operations 36) The Developer shall apply Control Measure to limit traffic (site worker or public) impacts and proactively locate material delivered to the site in close proximity to the work area or immediately incorporated in the construction to limit operational impacts to disturbed areas, vehicle tracking, and sediment deposition that could impact water quality. FORT COLLINS STORMWATER CRITERIA MANUAL Appendix F Page 6 Outdoor Storage or Construction Site Materials, Building Materials, Fertilizers, and Chemicals 37) Any materials of a non-polluting nature (steel, rock, brick, lumber, etc.) shall be inspected for any residue coming off the material during routine inspection and will generally be located where practical at least fifty (50) feet from any permanent or interim drainage ways. 38) Any high environmental impact pollutant materials that have a high likelihood to result in discharge when in contact with stormwater (lubricants, fuels, paints, solvents, detergents, fertilizers, chemical sprays, bags of cement mix, etc.) should not be kept on site where practical. When not practical, they should be stored inside (vehicle, trailer, connex, building, etc.) and out of contact with stormwater or stormwater runoff. Where not available, they shall be stored outside in a raised (high spots or on pallets), covered (plastic or tarped), and sealed (leak proof container) in secondary containment location. The secondary containment or other Control Measure shall be adequately sized, located, where practical, at least fifty (50) feet from any permanent or interim stormwater structures or drainage ways and shall be monitored as part of the routine inspections. Vehicle and equipment maintenance and fueling 39) Parking, refueling, and maintenance of vehicles and equipment should be limited in one area of the site to minimize possible spills and fuel storage areas. This area shall be located, where practical, at least fifty (50) feet from any permanent or interim stormwater structures or drainage ways and shall be monitored as part of the routine inspections. All areas shall keep spill kits and supplies close. Significant Dust or Particulate generating Process 40) The property must be actively preventing the emission of fugitive dust at all times during construction and vegetation activities. All land disturbing activities that result in fugitive dust shall be in accordance with Municipal Code §12-150 to reduce the impacts to adjacent properties and community health. All required practices shall be implemented and additional ones shall be followed. These practices include watering the sites and discontinuing construction activities until the wind subsides as determined by any City Inspectors. Concrete truck / equipment washing, including the concrete truck chute and associated fixtures and equipment 41) All concrete and equipment washing shall use structural Control Measures appropriate to the volume of wash and frequency of use. These Control Measures shall be located, where practical, at least fifty (50) feet from any permanent or interim stormwater structures or drainage ways and shall be monitored as part of the routine inspections. These areas shall be clearly identified and protected from any wash from leaving the Control Measure. If frequent FORT COLLINS STORMWATER CRITERIA MANUAL Appendix F Page 7 access from hardscape to the Control Measure is to occur, a structural tracking Control Measure shall be implemented. These Control Measures shall be frequently cleaned out. 42) The Developer is responsible for ensuring washing activity is taking place at the appropriate Control Measure and site workers are not washing or dumping wash water on to the dirt or other uncontrolled locations. Dedicated Asphalt and concrete batch plants 43) Dedicated asphalt and concrete batch plants are not acceptable on construction sites within the City of Fort Collins without an expressed written request and plan to reduce pollutants associated with that type of activity and approval by the City of Fort Collins specifically the Erosion Control Inspector. The Developer shall inform the erosion control inspection staff of any dedicated asphalt, or concrete batch plants that is to be used on site. Concrete Saw Cutting Materials 44) Saw cutting material shall be in accordance with Municipal Code §12-150 for air emissions and all water applications to the saw cutting shall prevent material from leaving the immediate site and collected. These cutting locations, once dried, shall be swept and scraped of all material and shall have proper and legal disposal. Waste Materials Storage and Sanitary Facilities 45) Trash, debris, material salvage, and/or recycling areas shall be, where practical, at least fifty (50) feet from any permanent or interim stormwater structures or drainage ways and shall be monitored as part of the routine inspections. These facilities should be located out of the wind and covered as able. Where not able to cover, locating said areas on the side of other structures to reduce exposure to winds, and follow maximum loading guidelines as marked on the container. The Developer is required to practice good housekeeping to keep the construction site free of litter, construction debris, and leaking containers. 46) Sanitary facilities shall be prevented from tipping through the use of anchoring to the ground or lashing to a stabilized structure. These facilities shall also be located as far as practical from an inlet, curb cut, drainage swale or other drainage conveyances to prevent material transport from leaving the local area. This consists of the facility being located, where practical, at least fifty (50) feet from any permanent or interim drainage ways. Other Site Operations and Potential Spill Areas 47) Spills: For those minor spills that; are less than the State’s reportable quantity for spills, stay within the permitted area, and in no way threaten any stormwater conveyance, notify the FORT COLLINS STORMWATER CRITERIA MANUAL Appendix F Page 8 City of Fort Collins Utilities by email at erosion@fcgov.com or phone (970) 817-4770. For any significant, major, or hazardous spills, notify the City of Fort Collins Utilities by phone only after Emergency Response (911) has been notified and is on route, County Health Department (LCDHE) has been notified through Larimer County Sheriff Dispatch (970) 416-1985, and the State Spill Hotline Incident Reporting have been contacted 1-877-518-5608. Written documentation shall be provided to the City within 5 days of the event. All spills shall be cleaned up immediately. 48) Selection of “plastic welded” erosion control blankets shall not be used in areas that wildlife, such as snakes, are likely to be located as these have proven to cause entrapment issues. Final stabilization and project completion 49) Any stormwater facilities used as a temporary Control Measure will be restored and storm sewer lines will be cleaned upon completion of the project and before turning the maintenance over to the Owner, Homeowners Association (HOA), or other party responsible for long term maintenance of those facility. 50) All final stabilization specifications shall be done in accordance with the Manual, Chapter 4: Construction Control Measures. 51) All disturbed areas designed to be vegetated shall be amended, seeded & mulched, or landscaped as specified in the landscape plans within 14 working days of final grading. 52) Soil in all vegetated (landscaped or seeded) areas, including parkways and medians shall comply with all requirements set forth in Sections 12-130 through 12-132 of the City Municipal Code, as well as Section 3.8.21 for the City Land Use Code. 53) All seeding shall refer to landscaping plans for species mixture and application rates and depths requirements. 54) All seed shall be drilled where practical to a depth based upon the seed type. Broadcast seeding shall be applied at double the rate as prescribed for drill seeding and shall be lightly hand raked after application. Hydroseeding may be substituted for drill seeding on slopes steeper than 3(H):1(V) or on other areas not practical to drill seed and crimp and mulch. All hydroseeding must be conducted as two separate processes of seeding and tackification. 55) All seeded areas must be mulched within twenty-four (24) after planting. All mulch shall be mechanically crimped and or adequately applied tackifier. The use of crimped mulch or tackifier may require multiple re-applications if not properly installed or have weathered or degraded before vegetation has been established. Areas of embankments having slopes greater than or equal to 3H:1V shall be stabilized with an erosion mat or approved equal to ensure seed will be able to germinate on the steep slopes. During a season when seeding does FORT COLLINS STORMWATER CRITERIA MANUAL Appendix F 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.