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Home My WebLink AboutBLOOM OFFSITE WATER - BASIC DEVELOPMENT REVIEW - BDR220004 - SUBMITTAL DOCUMENTS - ROUND 3 - STORMWATER MANAGEMENT PLAN Storm Water Management Plan Bloom Offsite Waterline Project Owner: Hartford Homes 4801 Goodman Road Timnath, Colorado 80547 Phone: (970) 674-1109 Prepared By: Galloway & Company, Inc. 5265 Ronald Reagan Blvd., Suite 210 Johnstown, CO 80534 Contact: James Prelog, P.E. Landowner: POUDRE VALLEY CO-OPERATIVE ASSOC INC 225 NW FRONTAGE RD FORT COLLINS, CO 80524 SWMP Preparation Date: January 16, 2023, 2022 Estimated Project Dates: Project Start Date: January 2023 Project Completion Date: March 2023 Project Owner/Developer Signature Block I have reviewed the information contained within the Storm water Management Plan and accept responsibility for the requirements set forth. _________________________________ __________________ Permittee/Affiliation Date Plan Preparer Signature Block I acknowledge my responsibility for the preparation of the Stormwater Management Plan. __________________________________ __________________ Colorado Professional Engineer Date TABLE OF CONTENTS SECTION 1 SITE DESCRIPTION i. Site Location ii. Description of Adjacent Areas a) Nature and Purpose of Construction Activity b) Construction Sequence of Major Activities c) Area of Disturbance d) Topography, Soils, and Rainfall Data e) Existing Vegetation f) Potential Sources of Pollution g) Non-Stormwater Discharges h) Receiving Waters i) Site Features and Sensitive Areas to be Protected j) Other Applicable Federal, State or Local Programs, Regulations or Restrictions VICINITY MAP SECTION 2 DESIGN DRAWINGS SECTION 3 STORMWATER MANAGEMENT CONTROLS a) SWMP Administrator and Important Contacts b) Identification of Potential Pollutant Sources c) BMPs for Storm water Pollution Prevention d) Changes in Construction Activity and BMP Implementation e) Hazardous Material Handling and Spill Prevention SECTION 4 FINAL STABILIZATION AND LONG TERM STORMWATER MANAGEMENT a) Final Stabilization Measures b) Seed Mix Information c) Final Stabilization Notes SECTION 5 INSPECTIONS AND MAINTENANCE APPENDIX A - Floodplain information APPENDIX B - Soils Information APPENDIX C - Erosion and Sediment Control Escrow/Security Calculations APPENDIX D - Construction Sequence Matrix APPENDIX E - Best Management Practice (BMP) Details APPENDIX F - Colorado Discharge Permit System (CDPS) Application APPENDIX G - Sample Inspection Log APPENDIX H – Floodplain Permit APPENDIX I – Erosion Control Plans SECTION 1 SITE DESCRIPTION i. Site Location The Bloom Offsite Wateline project is located in the northeast quarter of section 9, township 7 north, range 68 west of the 6th P.M., City of Fort Collins, County of Larimer, State of Colorado. CDPS Permit #: To Be Determined *A copy of the permit is available in Appendix F. ii. Description of Adjacent Areas: The project site consists of approximately 260 acres of vacant and undeveloped tract of land that is currently being used for farming. Existing grades across the site vary from 0.5 to 3 percent. The site generally drains from north to south. There are existing train tracks across the northern portion of the site that run diagonal from the northwest to the southeast. The project site is located within the Cooper Slough/Boxelder Basin and the Cooper Slough channel is located just to the west of the project site. iii. Description of Erosion Control Phasing: This project will be conducted in one phase. All erosion control measures will be in place for the entirety of construction of this project. A. NATURE AND PURPOSE OF CONSTRUCTION ACTIVITY The purpose of this construction activity is to prepare the site for installation of a new water main. Typical construction activities associated with this kind of development are grubbing, rough grading, installation of underground utility mains. B. CONSTRUCTION SEQUENCE OF MAJOR ACTIVITIES - Estimated project start date: January 2023 - Estimated project completion date: March 2023 Major Phases of Construction: * Refer to Appendix D for the Construction Sequence Matrix. * Refer to Appendix J for a copy of the site map, design drawings, erosion control phasing plan, overall grading, and offsite flow exhibit. - Install initial erosion and sediment controls, such as silt fence and vehicle tracking control prior to any earth disturbing activity. - Install utilities (e.g., domestic water) - Erosion and sediment control measures will remain in place until final stabilization has been achieved. The contractor will prepare a detailed construction sequence, including BMP installation timing, for inclusion in the SWMP. Final stabilization is anticipated to be performed by the installation of landscaping materials and seeding as remediation of the site is performed following the installation of the waterline. C. AREA OF DISTURBANCE The total area of the site within the project boundaries is ±5.45 acres. This area falls inside of the construction easement shown on the plan set and will be the only area disturbed for this project. Area estimates: - Limit of Construction: 5.45 acres - Total Storage/Staging Areas: 0.03 acres - The site was covered in existing vegetative cover (native grasses and weeds). The site was used for agriculture. Total Disturbed Project Area 5.45 Acres Total Onsite area of Disturbance 5.45 Acres Total Offsite area of Disturbance 0 Acres Total Storage and Staging Area 0.03 Acres Total Haul Roads Area N/A Construction Vehicle Traffic Area N/A Est. Perent of Project Area Exposed 100% Est. Percent Vegetative Cover 100% Project area is a Farmer field Exiting Soil Type Nunn Clay Loam See Soil Type Appendix Groundwater Depth 11 Feet Number of Phases for Project N/A Total Volume of Imported/Exported material 0 Cubic Feet Total Area of Stockpiling of fill or borrow areas off site 0 Acres Steepest Slope N/A Grades will not be changed with this project Distance from a riparian area of sensitive area 75 Feet (To Cooper Slough) D. TOPOGRAPHY, SOILS AND RAINFALL DATA Existing grades across the site vary from 0.5 to 3 percent. The site generally drains from north to south. According to the Natural Resources Conservation (NRCS) Web Soil Survey, the project site consists of a mix of soil types and Hydrologic Soil Groups (HSG) including: - Ascalon Sandy Loam (33%), HSG ‘B’ - Fort Collins Loam (27%), HSG ‘C’ - Garrett Loam (23%), HSG ‘B’. This soil is associated with Hydrologic Soil Group (HSG) ‘C’. HSG ‘C’ soils have a slow infiltration rate when thoroughly wet and 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. The remainder of the site consists of a mix of HSG ‘B’ and ‘C’ soils. Normal Monthly Precipitation Table in Inches Jan Feb Mar Apr May June July Aug. Sept. Oct. Nov. Dec. 0.36 0.48 1.18 1.97 2.74 1.83 1.62 1.42 1.27 1.13 0.59 0.49 Source: www.wrcc.dri.edu/cgi-bin/cliMAIN.pl?co3005 Impervious and Runoff Coefficients Percentage impervious area before construction: 0% Runoff coefficient before construction (C2): 0.20 Percentage impervious area after construction (grading): 65% Runoff coefficient after construction (C2): 0.70 E. EXISTING VEGETATION The site was used for agriculture. The ground cover across the existing site consists of native grasses and weeds. The existing percent vegetation cover was very good, ±75%. F. POTENTIAL POLLUTION SOURCES During construction there is potential for pollution from trenching and utility construction. Most importantly, these are earth disturbing activities. The potential for pollution arises not just from grading and excavation but also equipment and material staging areas, equipment refueling and maintenance, equipment washing and the on-site use of paints, solvents, and other chemicals common to this type of construction activity. Pollution can occur when the aforementioned are exposed to rainfall and/or runoff. The contact can contaminate the stormwater. Additionally, there is a potential for pollution from the worker’s trash and portable toilets. Since the location of this potential pollution is dictated by the current construction activity, they will be shown and updated on the Site Maps by the Contractor. G. NON-STORMWATER DISCHARGES All discharges covered by this permit shall be composed entirely of stormwater associated with construction activity, however, there are several exceptions including uncontaminated springs, landscape-irrigation return flow, construction dewatering, and concrete washout. The SWMP should address the location and description of any anticipated allowable sources of non- stormwater discharge at the site. H. RECEIVING WATERS There are two ultimate outfalls for the site’s drainage. One on the upper portion of the Cooper Slough and another at the southern portion of the site along the Redman development. The master plan for this drainage basin is currently being updated but we were able to review a copy of the plan dated February 2021. This report is titled “City of Fort Collins Upper Cooper Slough Basin Selected Plan of Improvements” prepared by Icon Engineering, Inc. (Master Plan). The Cooper Slough drainage basin flow predominantly runs north to south over land uses characterized as farmland and open space. The Cooper Slough drainage basin eventually feeds the Cache La Poudre River. Improvements to the Cooper Slough are outside the boundaries of this project and therefore are not a part of this project. I. SITE FEATURES AND SENSITVE AREAS TO BE PROTECTED There are multiple features protected on the project site, including: an existing wetland on the west side of project site and the Cooper Slough channel is located just to the west of the project site. The project site’s construction has minimal impact on these sensitive areas and will provide immediate erosion control BMPs, such as silt fences, to ensure no detrimental impact is placed on these protected areas. J. OTHER APPLICABLE FEDERAL, STATE OR LOCAL PROGRAMS, REGULATIONS OR RESTRICTION No other applicable restrictions apply. We are not aware of endangered species and the site is not designated as a historical site. A floodplain use permit (City of Fort Collins, Section 10-27 – Appendix J) was submitted to account for the project’s impact or change to the floodplain. We are not aware of any other permits, however, the contractor is responsible for any further necessary or appropriate permits. A geotechnical report prepared for Hartford Homes, on May 11, 2017 titled “PRELIMINARY GEOTECHNICAL INVESTIGATION SPRINGER-FISCHER PROPERTY FORT COLLINS, COLORADO” provides a figure (appendix I) displaying the depth to groundwater for the project site. Soil disturbance will be seen across the entirety of the limits of construction. As soil is disturbed through rough or final grading, appropriate BMPs will be applied and maintained to reduce soil exposure. BMPs include but are not limited to seeding, mulching, and surface roughening. Two sensitive or riparian areas exist on the west portion of the project site. Both, the Cooper Slough channel and the existing wetland are outside of the project site. The closest distance to either of these two sensitive areas is 75’ and should have no impact. SITE MAPS Refer to Appendix J for Site Maps Erosion Control VICINITY MAP Vicinity Map – Bloom Offsite Water Not to Scale Larimer-Weld Canal Bloom Offsite water Project Site Cooper Slough Lake Canal SECTION 2: DESIGN DRAWINGS Refer to Appendix J for Design Drawings Overall Landscape Plan SECTION 3: STORMWATER MANAGEMENT CONTROLS A. SWMP ADMINISTRATOR AND IMPORTANT CONTACTS The SWMP Administrator is responsible for developing, implementing, maintaining, and revising the SWMP. The Contractor shall designate a SWMP Administrator which will be the contact for all SWMP related issues and the person responsible for its accuracy, completeness, and implementation. The SWMP Administrator should be a person with authority to adequately manage and direct day-to-day stormwater quality management activities at the site. The SWMP Administrator is responsible for holding a weekly storm water meeting attended by the General Contractor with all contractors and subcontractors involved in earth disturbing activities to review the requirements of the Permit(s), the SWMP and address any problems that have arisen in implementing the SWMP or maintaining the BMPs. The Contractor shall maintain a log of all weekly meetings and document the issues addressed in the meetings. B. IDENTIFICATION OF POTENTIAL POLLUTANT SOURCES Potential pollutant sources for this site include: · Disturbed and Stored Soils: The site will be grubbed and trenched prior to major utility construction. The site should receive temporary seeding and mulching within 7 days of the last disturbance if no further disturbance is expected for at least 14 days. Place sediment control BMPs. Additional strategies for minimizing erosion and sediment control can be found in Stockpile Management (SP). · Vehicle Tracking of Sediments: There is potential for tracking of soils between the beginning of the construction process and the final stabilization of the site. Vehicle Tracking Control (VTC) is to be installed prior to land disturbance activities and sweeping is to take place as needed. Vehicle access to the exposed and disturbed subgrade will be limited primarily to roll on/off earthmoving equipment and heavy materials delivery trucks. The SWMP Administrator is responsible for ensuring that access to exposed subgrade is limited, both in quantity and in timing relative to the tracking susceptibility of the soil as it relates to moisture content. The SWMP Administrator must keep the adjacent parking areas and public rights-of-way free from mud and other tracked debris from the site. · Management of Contaminated Soils: We are not aware of contaminated soils that exist within the limits of the proposed earth disturbing activity. Our knowledge of the pre- development activities within the site does not suggest that contimainated soils will be discovered during the construction process. · Loading and Unloading Operations: All loading and unloading operations of equipment shall be carried out in areas protected by erosion and sediment controls. It is recommended that all equipment be cleaned on-site and within protected areas prior to exiting the site. · Vehicle and Equipment Maintenance and Fueling: Reference Good Housekeeping Practices (GH) in Appendix E for additional information about good housekeeping practices designed to prevent pollution associated with solid, liquid and hazardous construction-related materials and wastes. If equipment is to be maintained and stored in an open area this area should not be within the drip line of trees and not be within 100 feet of a watercourse or wetland. Runoff should be diverted away from watercourses and wetlands. Maintenance should be done on impervious areas surrounded with impervious berms. Where this is not possible, use pads designed to contain the pollutants which may leak or spill during maintenance operations. Impervious pads are particularly important on sandy and other coarse soils where spilled materials can easily infiltrate and possibly leach into the groundwater. Equipment shall be checked before and after each use and, at a minimum, during the weekly stormwater inspection if otherwise idle. Periodic checks of the equipment wash areas shall be performed to ensure proper operation. Temporary on-site fuel tanks for construction vehicles shall meet all state and federal regulations. Tanks shall have approved spill containment with the capacity required by the applicable regulations. From NFPA 30: All tanks shall be provided with secondary containment (i.e., containment external to and separate from primary containment). Secondary containment shall be constructed of materials of sufficient thickness, density, and composition so as not to be structurally weakened by contact with the fuel stored. Secondary containment must also be capable of containing discharged fuel for a period of time equal to or longer than the maximum anticipated time sufficient to allow recovery of discharged fuel. It shall be capable of containing 110% of the volume of the primary tank if a single tank is used, or in the case of multiple tanks, 150% of the largest tank or 10% of the aggregate, whichever is larger. The tanks shall be in sound condition free of rust or other damage which might compromise containment. Fuel storage areas will meet all EPA, OSHA and other regulatory requirements for signage, fire extinguisher, etc. Continual maintenance of hoses, valves, fittings, caps, filler nozzles and associated hardware is required to ensure proper working condition at all times. The location of fuel tanks shall be shown on the Site Maps and shall be located to minimize exposure to weather and surface water drainage features. A Spill Prevention, Control and Countermeasure (SPCC) Plan must be developed if aboveground oil storage capacity at the construction site exceeds 1,320-gallons or as specified by state. Containers with a storage capacity of 55-gallons or less are not included when calculating site storage capacity. The General Contractor shall develop and implement a SPCC Plan in accordance with the Oil Pollution Prevention regulation at Title 40 of the Code of Federal Regulations, Part 112, (40 CFR 112). · Concrete Truck/Equipment Washing: A Concrete Washout Area (CWA) shall be installed, with a liner, prior to any concrete placement on-site. Signs shall be placed at the construction entrance(s), at the washout area and elsewhere as necessary to clearly indicate the location of the concrete washout area. The washout area shall be repaired and enlarged or cleaned out as necessary to maintain capacity for wasted concrete. Concrete and concrete wash water shall be removed from the site and disposed of at an accepted waste facility. · Non-Industrial Waste Sources: Portable toilets: All personnel involved with construction activities must comply with state and local sanitary or septic system regulations. Temporary sanitary facilities will be provided at the site throughout the construction phase. They must be utilized by all construction personnel and must be serviced weekly by a commercial operator. The location of sanitary facilities shall be shown on the Site Maps. Portable toilets must be securely anchored a minimum of 10’ behind curbs and are not allowed within 50’ of inlets or within 50’ of a water of the State or the municipal storm drain system. · Non-industrial waste sources such as worker’s trash and portable toilets: The site shall be policed at the end of each workday to be kept free of trash and debris resulting from workers day-to-day activities. If necessary, place clearly marked and protected containers for trash and debris at convenient locations throughout the site. The burying of waste on-site is prohibited. Trash must be properly contained at the end of each day. · Dedicated Asphalt and Concrete Batch Plants: Neither a dedicated asphalt nor a concrete batch plant is anticipated with the proposed construction activity. · Outdoor storage of construction materials, building materials, fertilizers and other chemicals: Outdoor storage is anticipated for this project site. All material like wood, shingles, tiles, siding insulation, cement, mortar, and stone are stored outside. Chemicals are not anticipated to be left outside. All material will undergo routine monitoring to ensure weather exposure does not cause unwanted contamination (site management control). Tarps or other form of covering will be used to mitigate unwanted contamination by the elements. The location of storage / management areas clearly shown on the Site Map. Materials in outdoor storage may vary as construction progresses and such changes shall be reflected in the live SWMP. · Bulk storage of materials: Bulk storage shall be found in the designated outdoor storage areas (stockpile management). Exposure to the elements may cause unwanted contamination to stormwater. Thus, before construction, the designated storage location must be evaluated to allow adequate space for all bulk materials. After adequate space is acquired, additional measures are needed to ensure no unwanted contamination of the stormwater. Such measures include trapping spills within the storage area, ensuring at least 50 feet distance from any flow lines, a fence to prevent sedimentation escaping or coming into the storage location, and coverings when appropriate for material. · Fugitive dust or particulate generating processes: Earth moving activities, street sweeping, and track-out and carry out, and bulk materials transport all result in transport of particulates. Reasonable precautions must be taken to mitigate offsite transport of atmospheric pollution. The project will follow all required “BMPs” articulated in the Fugitive Dust Manual and at least one additional BMP included during each of the identified activities in accordance with City Ordinance No. 044, 2016. In addition, a copy of the Dust Control Manual shall always be kept in the trailer during construction. Activities will include watering the site, covering trucks, slower site speeds, and vehicle tracking units. · Routine maintenance activities involving fertilizers, pesticides, detergents, fuels, solvents, and oils: Contamination from these materials is hazardous to the community and to the local wildlife. Thus, due care and monitoring is required for said materials. Healthy vegetation requires the use of fertilizers and pesticides. Application and timing will take heed to weather and regulations to mitigate potential contamination of stormwater due to fertilizer and pesticide’s solubility. Application cannot happen if weather dictates precipitation on the day of application or the next day. In addition, these materials will not be stored onsite unless covered and elevated above the ground to prevent unwanted contamination. Detergent, paints, acids, cement, grout, and solvents will also be required to complete construction. Contamination of water by said products is easily noticeable by color and smell of said water. Contractor shall be on alert for any oddities of stormwater and ensure these materials are handled, operated, and cleaned up within the inside of the structure where these materials are being applied. When external use is required, care must be taken to ensure construction connex boxes, trailers, vehicles, or similar are not exposed to precipitation. Fuels and oils might be associated with the smaller construction equipment on site. Petroleum products suspend in water and thus, are easily noticed. Monitor stormwater and store said products in construction connex boxes, trailers, vehicles, or similar to mitigate exposure to weather, specifically precipitation. · On site waste management practices: Waste will undoubtedly exist on site and must be properly removed. All large and heavy weighted waste piles (concrete chunks, excavated pipes, and the like) must be kept in a neat, grouped pile until the material is properly removed from the site. Said piles shall not exceed 5-10 days and are kept 50 feet from any flow lines or inlets. All dumpsters must be hauled off if full and regular haul offs shall be scheduled. Dumpsters must also be monitored for any leakage of “Dumpster Juice,” especially during wet conditions. Every day, the site must be walked to collect trash to prevent littering. No burying of construction debris (including broken concrete) is allowed on site. · Saw cutting and grinding: Saw cutting and grinding will require hardened saws. Water the cutting surfaces to prevent dust and other airborne particulates (refer to BMP in the City’s Fugitive Dust Manual) is required. Utilize water on the saw itself to mitigate dust and overheating. Contain the cutting slurry, which contains fine particulates, such as Silica Dust and metals. After cutting is done, vacuum up the cutting slurry or sweep and scrape the cutting slurry after it is dried. C. BMPs FOR STORMWATER POLLUTION PREVENTION The initial erosion and sediment control measures will consist of installing Silt Fence (SF) along the perimeter of the site and around the perimeter of anticipated stockpile areas. Vehicle Tracking Control (VTC) should be installed as shown on the Site Map. Prior to construction of any concrete fixtures a Concrete Washout Area (CWA) shall be installed on site. These BMPs will remain in place and be properly maintained until landscaping is installed and/or final stabilization within the respective tributary area of the site occurs. All portions of land which may be disturbed will be temporarily or permanently seeded, landscaped or paved as noted on the design drawings (refer to Appendix J). The specifics for each measure to be utilized and/or installed are indicated below: STRUCTURAL PRACTICES * Refer to Appendix D for details · Temporary and Permanent Seeding (TS/PS): All denuded areas that will be inactive for 14 days or more must be stabilized temporarily with the use of fast-germinating annual grass/grain varieties appropriate for site soil and climate conditions, straw/hay mulch, wood cellulose fibers, tackifiers, netting and/or blankets. Stockpiles and diversion ditches/berms must be stabilized to prevent sediment and erosion and dust issues, respectively. · Permanent Seeding, Sodding or Mulching (TS/PS): All areas at final grade must be seeded or sodded within 14 days after completion of work in that area. Prepare soil and seed immediately after final grade is achieved. On completion of earth disturbing activities, the entire site must have permanent vegetative cover meeting vegetative density requirements or mulch. Except for small (<100 sq.ft.) level spots, seeded areas should be protected with mulch, tackifier or a rolled erosion control product. Mulch must be crimped by disc or other machinery. · Silt Fence (SF): Silt fence is a synthetic permeable woven or non-woven geotextile fabric incorporating support stakes at intervals sufficient to support the fence (5-feet maximum distance between posts), water and sediment retained by the fence. The fence is designed to retain sediment-laden storm water and allow settlement of suspended soils before the storm water flows through the fabric. Silt fence shall be located on the contour to capture overland, low-velocity sheet flows. · Vehicle Tracking Control (VTC): All points closed to the general public and providing access into the construction site shall include a marked construction exit that will be monitored for any signs of tracking from the construction site. It is expected that only trailer delivered equipment will access the exposed subgrades and that vehicle tracking adjacent to publically accessible parking and public rights-of-way should not be evident. It may also be necessary to install a wheel wash system. If this is done, a Sediment Trap (ST) control must be installed to treat the wash water before it discharges from the site. Discharge must be directed to the detention pond within the limits of construction as indicated. · Soil Stockpile Management (SP): Soil stockpiles should be located away from all drainage system components including storm sewer inlets. Sediment control BMPs should be placed around the perimeter of all stockpiles. Soils stockpiled for more than 30 days should be seeded and mulched with a temporary grass cover. · Good Housekeeping Practices (GH): Good housekeeping practices include providing waste management, establishing proper building material staging areas, designating paint and concrete washout areas, establishing proper equipment and vehicle fueling and maintenance practices, controlling equipment and vehicle washing and allowable non-storm water discharges and developing a spill prevention and response plan. · Stabilized Staging Area: This is a clearly designated area where construction equipment and vehicles, stockpiles, waste bins and other construction-related materials are stored. The stabilized storage area consists of a stabilized surface, covered with 3- inch diameter aggregate or larger. · Surface Roughening (SR): Surface roughening consists of tracking, scarifying, imprinting, or tilling a disturbed area to provide temporary stabilization of disturbed areas. It is used to provide temporary stabilization of disturbed areas, such as when re- vegetation cannot be immediately established. · Construction Fence (FC): Construction fences restrict access to the construction site or protected areas during construction. Construction fences may be chain link or plastic mesh and are installed per manufacturer’s recommendations. · Concrete Washout Area (CWA): Concrete washout areas are designed to receive water from washing tools, concrete mixer chutes, liquid concrete waste from mobile batch mixers, dump trucks, or pump trucks. A plastic liner or a prefabricated container will be installed with each concrete washout area due to the presence of a shallow groundwater water-table. The concrete washout area must be at least 50 feet from any flow lines and is temporary (less than 1 year). D. CHANGES IN CONSTRUCTION ACTIVITY AND BMP IMPLEMENTATION Should there be changes to the implemented BMPs, the Administrator shall be notified and the SWMP must be modified to accurately reflect the field conditions. Examples include, but are not limited to, removal of BMPs, identification of new potential pollutant sources, addition of BMPs, modification of BMP installation and implementation criteria or maintenance procedures and changes in items included in the Site Map and/or description. SWMP revisions must be made prior to changes in site conditions, except for Responsive SWMP Changes, as follows: · SWMP revisions must be made immediately after changes are made in the field to address BMP installation and/or implementation issues; or · SWMP revisions that require the development of supporting documentation (e.g., design of retention pond capacity) must be made as soon as practicable, but in no case more than 72 hours, after change(s) in BMP installation and/or implementation occur at the site. This SWMP should be viewed as a “living document” that is to be continuously reviewed and modified as part of the overall process of assessing and managing storm water quality issues on-site. E. HAZARDOUS MATERIAL HANDLING AND SPILL PREVENTION Any hazardous or potentially hazardous material that is brought onto the construction site will be handled properly to reduce the potential for storm water pollution. All materials used on this construction site will be properly stored including the use of secondary containment measures, handled, dispensed, and disposed of following all applicable label directions. Flammable and combustible liquids will be stored and handled according to 29 CFR 1926.152. Only approved containers and portable tanks shall be used for storage and handling of flammable and combustible liquids. Material Safety Data Sheets (MSDS) information will be kept on-site for any and all applicable materials. In the event of an accidental spill, immediate action will be undertaken by the General Contractor to contain and remove the spilled material. All hazardous materials will be disposed of by the Contractor in the manner specified by federal, state and local regulations and by the manufacturer of such products. As soon as possible, the spill will be reported to the appropriate agencies. As required under the provisions of the Clean Water Act, any spill or discharge entering waters of the United States will be properly reported. The General Contractor will prepare a written record of all spills and-+ associated clean-up and will notify the City of Fort Collins (970-221-6700) and the Colorado Department of Public Health and Environment (CDPHE) (1-877-518-5608). The General Contractor will provide notice to Owner immediately upon identification of a reportable spill. Any spills of petroleum products or hazardous materials in excess of Reportable Quantities as defined by EPA or the state or local agency regulations, shall be immediately reported to the EPA National Response Center (1-800-424-8802), the Colorado Department of Public Health and Environment (CDPHE) (1-877-518-5608) and the City of Fort Collins (970-221-6700). The State reportable quantity for petroleum products is 25 gallons or more (or that cause sheen on nearby surface waters). Spills from regulated aboveground and underground fuel storage tanks must be reported to the State Oil Inspector within 24 hours (after-hours contact CDPHE Emergency Spill Reporting Line). This includes spills from fuel pumps. Spills or releases of hazardous substances from regulated storage tanks in excess of the reportable quantity (40 CFR Part 302.6) must be reported to the National Response Center, the local fire authority immediately, and the State Oil Inspector and the City of Fort Collins within 24 hours. In order to minimize the potential for a spill of petroleum products or hazardous materials to come in contact with storm water, the following steps will be implemented: a) All materials with hazardous properties (such as pesticides, petroleum products, fertilizers, detergents, construction chemicals, acids, paints, paint solvents, additives for soil stabilization, concrete, curing compounds and additives, etc.) will be stored, including secondary containment measures in a secure location and under cover, when not in use. b) The minimum practical quantity of all such materials will be kept on the job site and scheduled for delivery as close to the time of use as practical. c) A spill control and containment kit (containing for example, absorbent material such as kitty litter or sawdust, acid neutralizing agent, brooms, dust pans, mops, rags, gloves, goggles, plastic, and metal trash containers, etc.) will be provided on the construction site and location(s) shown on Site Maps. The kit should be inspected for completeness as a part of weekly storm water inspections. d) All the product in a container will be used before the container is disposed of. All such containers will be triple rinsed, with water, prior to disposal. The rinse water used in these containers will be disposed of in a manner in compliance with State and federal regulations and will not be allowed to mix with stormwater discharges. e) All products will be stored in and used from the original container with the original product label. f) All products will be used in strict compliance with instructions on the product label. g) The disposal of excess or used products will be in strict compliance with instructions on the products label and local regulations. The contractor is responsible for the Spill Prevention and Control Plan (SPCP). If the contractor elects to provide his own SPCP, it must be included in the Appendix as a replacement. A contractor provided SPCP shall clearly state measures to stop the source of a spill, contain the spill, clean up the spill, dispose of contaminated materials and train personnel to prevent and control future spills. In addition the SPCP must include contact and documentation requirements for each of the Minor, Significant and Hazardous spill magnitudes. Further requirements are listed below in the equipment fueling section. SECTION 4: FINAL STABILIZATION & LONG-TERM STORMWATER MANAGEMENT a) In accordance with Part 1.C.4.c of the CDPS General Permit for Stormwater Discharges Associated with Construction Activity (COR-300000) (the stormwater permit): “Final stabilization is reached when all ground surface disturbing activities at the site have been completed and uniform vegetative cover has been established with an individual plant density of at least 70 percent of pre-disturbance levels, or equivalent permanent, physical erosion reduction methods have been employed.” The following criteria must be met when planning for final stabilization: · Stabilization must be permanent. Stabilization is defined by the City of Fort Collins as the site has reached 70% coverage and is inspected by the City of Fort Collins. · ALL disturbed areas must be stabilized · Alternatives must follow good practice The stormwater permit allows the use of alternatives to vegetation to achieve final stabilization. These alternatives must meet specific criteria to be considered equivalent to vegetation. Examples of alternative stabilization practices include: · Permanent Paving and Buildings · Hardscape · Geogrid · Xeriscape · Compacted and Stabilized Unpaved Driving Surfaces Once the site achieves final stabilization (see above), the BMPs can be removed. b) Seed Mix Information SF AC Dryland Pasture Mix 632 0.01 Snake Creek Grass Mix 236,864 5.44 c) Final Stabilization Notes: Buildings, hardscapes, and rock beds are considered stabilized immediately upon installation. Other exposed dirt areas require vegetation for stabilization. All seed mixtures for permanent or temporary seeding, and the Cooper Slough buffer requires preparation of soil in accordance with the City Municipal Code, section 12-130-132. Section 132 defines necessary actions for soil to comply with city standards and details about communicating with other potential parties. Vegetation should adhere to regulations specified in City of Fort Collins Landscape Standards (LUC 3.2.1). See section 4: “Final Stabilization & Long-Term StormWater Management” bullet for the City of Fort Collins definition of final stabilization. Reference Fort Collins’ Development Submittal Requirements in chapter 2, section 6.1.4.9 for additional requirements of final stabilization. The Cooper Slough 300’ Buffer enters the project site on the west side and will require its own seeding mixture. It is anticipated that the site is seeded in spring 2023 and will be fully established in the fall of 2026. A large section of this parcel of land is used for farming and will be seeded as such. All remaining non-farm related areas of the project will receive the proper seed mix as noted in the above table. Permanent stabilization, 70% vegetative density, is expected to be reviewed in October 2023 to help mitigate frost damage. All temporary control measures will be removed after final stabilization. Sediment shall be properly removed from all pipes, drainage ways, and other stormwater structures. Sediment will be properly disposed of on-site before final inspection. SECTION 5: INSPECTION & MAINTENANCE The contractor must keep the approved SWMP on-site at all times. An individual certified to inspect erosion and sediment control by a recognized organization must conduct all BMP inspections. Proof of certification shall be included in the SWMP. All regulatory authorities may inspect the land or site covered by the SWMP at any time, without prior notice, for compliance with the SWMP. If site conditions indicate that the objectives of this section are not being met, the operator shall make appropriate modifications to the SWMP. Any modification must be recorded on the owner’s copy of the SWMP and the Administrator notified. The contractor must maintain inspection records on-site with the SWMP and such records must be provided to the regulatory agencies for review upon request. The contractor must notify the Administrator if there is a change in design, construction, operation, or maintenance that has a significant effect on the potential for discharge of pollutants to the MS4 or receiving waters and the SWMP must be amended. The contractor must notify the Administrator and the SWMP amended, if the SWMP proves to be ineffective in achieving the general objectives of controlling pollutants in stormwater discharges associated with construction activities. INSPECTION PROCEDURES Between the time this SWMP is implemented and final Inactivation Notice has been submitted, thorough inspections will occur at least every 14 calendar days. Also, post-storm event inspections must be conducted within 24 hours after the end of precipitation event or snowmelt that could potentially cause surface erosion. The purpose of site inspections is to assess performance of pollutant controls. Based on these inspections the contractor, in consultation with the Administrator (if different) will decide whether it is necessary to modify this SWMP, add or relocate controls, or revise or implement additional Best Management Practices (BMPs) to prevent pollutants from leaving the site via storm water runoff. The contractor has the duty to cause pollutant control measures to be repaired, modified, supplemented, or take additional steps as necessary to achieve effective pollutant control. Note: If a BMP is covered by snow, mark the BMP as not applicable and document the reason the BMP can not be inspected on the daily report. Examples of specific items to evaluate during site inspections are listed below. This list is not intended to be comprehensive. During each inspection, the inspector must evaluate overall pollutant control system performance as well as particular details of individual system components. Additional factors should be considered as appropriate to the circumstances. · Vehicle Tracking Control (VTC): Locations where vehicles enter and exit the site must be inspected for evidence of off-site sediment tracking. A stabilized construction exit shall be constructed where vehicles enter and exit. Exits shall be maintained or supplemented as necessary to prevent the release of sediment from vehicles leaving the site. Any sediment deposited on the roadway shall be swept as necessary throughout the day or at the end of every day and disposed of in an appropriate manner. Sediment shall NOT be washed into storm sewer systems. · Erosion Control Devices: Rolled Erosion Control Products (i.e., nets, blankets, turf reinforcement mats) and marginally vegetated areas (i.e., areas not meeting required vegetative densities for final stabilization) must be inspected weekly. Rills, gullies, ruts, and other signs of erosion indicate the erosion control device is not functioning properly. Repair and/or additional erosion control devices may be warranted. · Material Storage Areas: Material storage areas should be located to minimize exposure to weather and runoff. Inspections shall evaluate disturbed areas and areas used for storing materials that are exposed to rainfall for evidence of, or the potential for, pollutants entering the drainage system or discharging from the site. If necessary, the materials must be covered, or original covers must be repaired or supplemented. Also, protective berms must be constructed, if needed, to contain runoff from material storage areas. All state and local regulations pertaining to material storage areas will be adhered to. · Discharge Points: All discharge points must be inspected to determine whether erosion and sediment control measures are effective in preventing discharge of sediment from the site or impacts to receiving waters. BMP MAINTENANCE The Stormwater Construction Permit requires that all erosion and sediment control practices and other protective measures identified in the SWMP be maintained in effective operating condition, and in accordance with good engineering, hydrologic and pollution control practices. Sediment that has been collected by sediment controls, such as silt fence and inlet protection, shall be removed when observed. To prevent failure of BMPs, ensure adequate BMP performance and remove the potential of sediment being discharged from the site if the BMP did fail. Removed sediment shall be properly disposed of on-site. Maintenance activities to correct problems noted during inspections must be documented as discussed in the documentation section, below. The inspection process must also include procedures to ensure that, when needed, BMPs are replaced or new BMPs added to adequately manage the pollutant sources at the site. This procedure is part of the ongoing process of revising the BMPs and the SWMP as discussed above, and any changes to BMPs must be recorded in the SWMP. The SWMP must be modified as soon as practicable to reflect current conditions. BMPs that have failed or have the potential to fail without maintenance or modifications, must be addressed as soon as possible, immediately in most cases, to prevent the discharge of pollutants. DOCUMENTATION All erosion control measures and stabilizations shall be inspected at least once every 14 calendar days. Also, post-storm event inspections must be conducted within 24 hours after the end of precipitation event or snowmelt that could potentially cause surface erosion. The permittee must document inspection results and maintain a record of the results for a period of three-(3) years following closing of permit coverage. Sample inspection logs are included in Appendix G. These records must be made available to the Owner, the City & County, the State or the EPA upon request. The following items must be documented as part of the site inspections: · The inspection date · Name(s) and title(s) of personnel making the inspection · Location(s) of discharges of sediment or other pollutants from the site · Location(s) of BMPs that need to be maintained · Location(s) of BMPs that failed to operate as designed or proved inadequate for a particular location · Location(s) where additional BMPs are needed that were not in place at the time of inspection · Deviations from the minimum inspection schedule as indicated above · Description and dates of corrective actions taken including requisite changes to the SWMP. A complete copy of the SWMP shall be kept with the inspection and maintenance records for the aforementioned three-(3) year period. (Contractor to provide physical address) REFERENCES 1. Fort Collins Stormwater Criteria Manual (Addendum to the Urban Storm Drainage Criteria Manuals Volumes 1, 2 and 3), prepared by the City of Fort Collins. 2. Urban Drainage and Flood Control District, Drainage Criteria Manual Volumes 1 and 2, prepared by Wright-McLaughlin Engineers, dated June 2001 (revised April 2008), and the Volume 3, prepared by Wright-McLaughlin Engineers, dated September 1992 and revised November 2010. 3. General Permit Application and Stormwater Management Plan Preparation Guidance, Colorado Department of Public Health and Environment (CDPHE), Revised May 2008. APPENDIX A – Floodplain Information FLOOD HAZARD INFORMATION NATIONAL FLOOD INSURANCE PROGRAMFLOOD INSURANCE RATE MAP LARIMER COUNT Y, COLORADOand Incorporated Areas Panel Contains: COMMUNITY NUMBER PANEL SUFFIX 09840984 JJLARIMER COUNTYFORT COLLINS, CITY OF 080101080102 MAP NUMBER08069C0984J VERSION NUMBER2.6.4.6 SCALE 0983 1003 0992 0982 1011 0981 1001 1000* 0984 0 1,000 2,000500feet 1 inch = 500 feet 1:6,000 Map Projection: LARIMER COUNTY 0 250 500125meters PANEL LOCATOR * PANEL NOT PRINTED NOTES TO USERS)))))))))))))))) ÑÑÑ ÑÑÑ ÑÑÑ ÑÑÑ Ñ Ñ ÑÑ Ñ Ñ ÑÑ Ñ Ñ ÑÑ Ñ Ñ ÑÑ Ñ Ñ ÑÑ Ñ Ñ ÑÑ Ñ Ñ ÑÑ Ñ Ñ ÑÑ Ñ Ñ ÑÑ Ñ Ñ ÑÑ Ñ Ñ ÑÑ Ñ Ñ ÑÑ Ñ Ñ ÑÑ Ñ Ñ ÑÑ Ñ Ñ ÑÑ Ñ Ñ ÑÑÑÑÑÑ Larimer CountyUnincorporated Areas080101 Larimer County Unincorporated Areas 080101 Larimer County Unincorporated Areas 080101 City of Fort Collins 080102 City of Fort Collins 080102 City of Fort Collins 080102 City of Fort Collins 080102 City of Fort Collins 080102 City of Fort Collins 080102 4 9 0 349034905 4 8 9 2 48814 8 9 3 4900.5 4 8 9 9 .3 4930.7 4898.1 ,D 4917.5 ,E 4897.14893.04888.04883.5 ,B ,X 4913.0 4945.6 4902.5 ,C B ,A A ,P ,A4896.1 4923.1 ,A 4913.6 4894.44919.9 4 8 9 3 .2 4900.3 ,K ,D 4903.7 ,O 4918.9 4920.7 4892.84928.3 ,C ,B 4 9 2 0 .5 4 8 9 2.94894.0,C4892.3,H ,Y4909.14945.7 4902.7,Q 4895.7 4930.5 ,A,N 4924.8 4909.04905.2 4 9 4 2 .0 ,W 4937.7 4930.5 4 9 2 3 .0 4 8 9 8 .6 4920.6 4893.1,C 4886.0 ,Z ,S 4894.4 4949.2 ,V 4 8 9 8 .5 ,R ,B ,E 4889.7 ,B 4923.6 ,F,CC ,J ,D ,B4896.74 9 0 9.7 ,D 4900.0 4916.94916.9 ,M 4902.3 4887.0 ,C4902.1 4895.6,B ,T ,I4914.3 ,F ,E ,C 4 8 9 8 .44892.7,C4895.7 4923.1 4900.9,A 4909.04883.3 4939.1 4916.9 4894.7 4892.3,U4894.3 Control Structure Bridge Bridge Bridge Bridge1 PCT AnnualChance Flood Discharge Contained in Structure 1 PCT Annual Chance Flood Discharge Contained in Structure 1 PCT Annual Chance Flood Discharge Contained in Structure Culvert Culvert Cache La Poudre River- RProspect SFP Cache LaPoudre River Cache LaPoudre River- LPATH SFP Cache La Poudre River Cooper SloughCooper Slough Boxelder Creek Boxelder Creek Lake Canal Cache La Poudre Reservoir Inlet Lake CanalBox-elder Creek Cache La Poudre River Reservoir Inlet Cache La Poudre River Split - R Path Box-elder Creek Cooper Slough Overflow Sherry Drive Overflow Spring Creek 15 22 8 16 20 9 17 21 10 MAP AREA SHOW NON THIS PANEL ISLOCATED W ITHINTOWNSHIP 7 NORTH,RANGE 68 W EST.N TIMBERLINE RDGREENFIELDS CTE L I N C O L N A V E JOHN DEERE DR DONELLA CT ZEPPELINWAYSTIMBERLINERDSEFRONTAGERDINTERNATIONAL BLVD E LOCUST ST S W F R O N T A G E R DHORIZON AVEJENNIE DR COUNTRY-SIDE DR COUNTRY-SIDE CT CRUSADER ST RELIANT ST VERDE AVEE MULBERRY ST EB T R A C E Y P K WY SE FRON-TAGE RDNEFRONTAGERDHARVESTER CT P L E A S A N T A C R E S D R E LINCOLN AVE GREENBRIAR DR ¦25 WEICKER DR DARREN CT COMET ST DASSAULT STCOLLINS AIRE LN CLIFFORD CTTIGERCATWAY REDMAN DR GREENBRIAR DRNWFRONTAGERDCOUNTRYSIDE DR ANNABEL AVE SUPERCUB LN DELOZIER RDLAKE CANAL CT RIVERBENDDRCRUSADER ST CONQUESTST RIVERBEND CT S SUMMIT VIEW DRTANA DR CENTRO WAYCHERLY ST LAURA LN FRONTAGE RD N RENE DRMAX ST KIMBERLY DRCOLEMAN ST FRONTAGE RD S ¦25 BOXELDER DR E PROSPECT RD S S U M MIT VIE W D RSUNRISE AVE¦25 STEVEN DR GREENFIELDS CTRAILROADQUINBY STMARQUISE ST JOHN DEERE DRCANAL DR FRONTAGE RD S KENWOOD DR BUCKEYE ST E MULBERRY ST WB TERRY DR DARREN ST SURREY LNDAWN AVESYKESDR COMET ST SW FRONTAGE RD A L A N S T SMITHFIELD DRVICOTWAYJAY DR MARCH CTANDREASTSHARP POINT DR CLIFFORD DRJOANNE STSUMMIT CTFAIRCHILD STDELOZIER DRCONQ-UEST WAY STOCKTON AVE COUN-TRYS-IDE CIR SW FRONTAGE RDSHERRY DRZONE AE ZONE AE ZONEAE ZONE AE ZONE AE(EL 4891)ZONE AE ZONE AE ZONE AE ZONE AO(DEPTH 2) ZONE AO(DEPTH 1) ZONE AE ZONE AE ZONE AE ZONE AE ZONE AE ZONE AE ZONE AO (DEPTH 2) ZONE AE ZONE AE ZONE AE ZONE AE LIMIT OF STUDY 105° 00' 00''40° 33' 45''40° 33' 45'' 40° 35' 38''105° 01' 52'' 105° 01' 52'' 40° 35' 38''105° 00' 00'' 1450000 FT 1455000 FT 3135000 FT 1450000 FT 1455000 FT 4493000m N 4492000m N 4491000m N 499000m E498000m E PANEL 984 OF 1420 1/26/2021 Universal Transverse Mercator (UTM) Zone 13N; North American Datum 1983;Western Hemisphere; Vertical Datum: NAVD 88 SPECIAL FLOODHAZARD AREAS OTHER AREAS OFFLOOD HAZARD OTHERAREAS GENERALSTRUCTURES Without Base Flood Elevation (BFE) With BFE or Depth Regulator y Floodway Area of Undetermined Flood Hazard Area of Minimal Flood Hazard Zone A,V, A99 Zone AE, AO, AH, VE, AR Zone X Zone D HTTPS://MSC.FEMA.GOV THE INFORMATION DEPICTED ON THIS MAP AND SUPPORTINGDOCUMENTATION ARE ALSO AVAILABLE IN DIGITAL FORMAT AT SEE FIS REPORT FOR DETAILED LEGEND AND INDEX MAP FOR FIRM PANEL LAYOUT Cross Sections with 1% Annual ChanceWater Sur face Elevation Coastal Transect OTHERFEATURES Prof ile BaselineHydrographic FeatureBase Flood Elevation Line (BFE)Limit of StudyJurisdiction Boundary Coastal Tr ansect Baseline 17.5 0.2% Annual Chance Flood Hazard, Areas of 1% annual chance f lood with average depth less than one foot or with drainage areas of less than one square mileFuture Conditions 1% Annual Chance Flood HazardArea with Reduced Flood Risk due to LeveeSee Notes. Zone X Zone X Zone X !(8 %,E 18.2 NO SCREEN Levee, Dike, or Floodwall Channel, Culver t, or Storm Sewer Area with Flood Risk due to Levee Zone D For information and questions about this Flood Insurance Rate Map (FIRM), available products associated withthis FIRM, including historic versions, the current map date for each FIRM panel, how to order products, or theNational Flood Insurance Program (NFIP) in general, please call the FEMA Mapping and Insurance eXchange at1-877-FEMA-MAP (1-877-336-2627) or visit the FEMA Flood Map Service Center website athttps://msc.fema.gov. Available products may include previously issued Letters of Map Change, a FloodInsurance Study Report, and/or digital versions of this map. Many of these products can be ordered or obtaineddirectly from the website. Communities annexing land on adjacent FIRM panels must obtain a current copy of the adjacent panel as well asthe current FIRM Index. These may be ordered directly from the Flood Map Service Center at the number listedabove. For community and countywide map dates refer to the Flood Insurance Study Report for this jurisdiction. To determine if flood insurance is available in this community, contact your Insurance agent or call the NationalFlood Insurance Program at 1-800-638-6620. Base map information shown on this FIRM was derived from the National Flood Hazard Layer (NFHL), dated2013 and digital data provided by Larimer County GIS Department, dated 2018. PRELIMINARY1/26/2021 MAP REVISED APPENDIX B – Soils Information Soil Map—Larimer County Area, Colorado (Soil Information) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 10/20/2022 Page 1 of 344933004493400449350044936004493700449380044939004493300449340044935004493600449370044938004493900499000499100499200499300499400499500499600499700499800499900500000 499000 499100 499200 499300 499400 499500 499600 499700 499800 499900 500000 40° 35' 46'' N 105° 0' 46'' W40° 35' 46'' N104° 59' 59'' W40° 35' 23'' N 105° 0' 46'' W40° 35' 23'' N 104° 59' 59'' WN Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84 0 200 400 800 1200 Feet 0 50 100 200 300 Meters Map Scale: 1:5,040 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 Map Unit Polygons Soil Map Unit Lines Soil Map Unit Points Special Point Features Blowout Borrow Pit Clay Spot Closed Depression Gravel Pit Gravelly Spot Landfill Lava Flow Marsh or swamp Mine or Quarry Miscellaneous Water Perennial Water Rock Outcrop Saline Spot Sandy Spot Severely Eroded Spot Sinkhole Slide or Slip Sodic Spot Spoil Area Stony Spot Very Stony Spot Wet Spot Other Special Line Features 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 17, Sep 7, 2022 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. Soil Map—Larimer County Area, Colorado (Soil Information) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 10/20/2022 Page 2 of 3 Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 22 Caruso clay loam, 0 to 1 percent slope 16.5 17.8% 33 Fluvaquents, nearly level 2.5 2.7% 40 Garrett loam, 0 to 1 percent slopes 19.1 20.6% 63 Longmont clay, 0 to 3 percent slopes 24.9 27.0% 73 Nunn clay loam, 0 to 1 percent slopes 28.8 31.2% 74 Nunn clay loam, 1 to 3 percent slopes 0.0 0.0% 76 Nunn clay loam, wet, 1 to 3 percent slopes 0.7 0.7% Totals for Area of Interest 92.4 100.0% Soil Map—Larimer County Area, Colorado Soil Information Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 10/20/2022 Page 3 of 3 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. Rating Options Aggregation Method: Dominant Condition Component Percent Cutoff: None Specified Tie-break Rule: Higher Hydrologic Soil Group—Larimer County Area, Colorado Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 3/18/2021 Page 4 of 4 APPENDIX C – Erosion and Sediment Control Escrow/Security Calculations Project:Disturbed Acres*:5.44 EROSION CONTROL BMPs Units Estimated Quantity Unit Price Total Price L.F.4017 $1.85 $7,431.45 Sediment Control Log each 0 $20.00 $0.00 each 0 $75.00 $0.00 Outlet Protection CY 0 $40.00 $0.00 each 1 $200.00 $200.00 each 2 $700.00 $1,400.00 Sub-Total:$9,031.45 1.5 x Sub-Total:$13,547.18 Amount of security:$13,547.18 Total Acres x Price/acre:$7,344.00 $1,350.00 Sub-Total:$7,344.00 1.5 x Sub-Total:$11,016.00 Amount to Re-seed:$11,016.00 Minimum escrow amount:$3,000.00 Erosion Control Escrow:$13,547.18 User Input Fields in BLUE should be amended for this project. “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” Curb Inlet Protection Concrete Washout (add all other BMPs for the site in this list) Final Escrow Amount Erosion and Sediment Control Escrow/Security Calculation BMP Amount Silt Fence Vehicle Tracking Control (VTC) Re-seeding Amount Miniumum Escrow Amount Bloom Offsite Water Unit Price of Seeding per acre: APPENDIX D – Construction Sequence Matrix Project: Bloom Offsite Water Date:10/19/2022 Municipality: City of Fort Collins Mobilization Demolition Earth Work Utilities Installation Flat work Installation Vertical Installation Landscape Demobilization Best Management Practices (BMPs) Structural "Installation" Silt Fence Barriers* Contour Furrows (Ripping / Disking) Sediment Trap / Filter Vehicle Tracking Pad* Collecting Asphalt / Concrete Saw Cutting Waste *All BMPs to be Removed once Construction is Complete. Vegetative Temporary Seeding Planting Any time the site will sit dorment longer than 30 Days. Permanent Seeding Planting Construction Sequence Matrix APPENDIX E – Best Management Practice (BMP) Details Silt Fence (SF) SC-1 November 2010 Urban Drainage and Flood Control District SF-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph SF-1. Silt fence creates a sediment barrier, forcing sheet flow runoff to evaporate or infiltrate. Description A silt fence is a woven geotextile fabric attached to wooden posts and trenched into the ground. It is designed as a sediment barrier to intercept sheet flow runoff from disturbed areas. Appropriate Uses A silt fence can be used where runoff is conveyed from a disturbed area as sheet flow. Silt fence is not designed to receive concentrated flow or to be used as a filter fabric. Typical uses include:  Down slope of a disturbed area to accept sheet flow.  Along the perimeter of a receiving water such as a stream, pond or wetland.  At the perimeter of a construction site. Design and Installation Silt fence should be installed along the contour of slopes so that it intercepts sheet flow. The maximum recommended tributary drainage area per 100 lineal feet of silt fence, installed along the contour, is approximately 0.25 acres with a disturbed slope length of up to 150 feet and a tributary slope gradient no steeper than 3:1. Longer and steeper slopes require additional measures. This recommendation only applies to silt fence installed along the contour. Silt fence installed for other uses, such as perimeter control, should be installed in a way that will not produce concentrated flows. For example, a "J-hook" installation may be appropriate to force runoff to pond and evaporate or infiltrate in multiple areas rather than concentrate and cause erosive conditions parallel to the silt fence. See Detail SF-1 for proper silt fence installation, which involves proper trenching, staking, securing the fabric to the stakes, and backfilling the silt fence. Properly installed silt fence should not be easily pulled out by hand and there should be no gaps between the ground and the fabric. Silt fence must meet the minimum allowable strength requirements, depth of installation requirement, and other specifications in the design details. Improper installation of silt fence is a common reason for silt fence failure; however, when properly installed and used for the appropriate purposes, it can be highly effective. Silt Fence Functions Erosion Control No Sediment Control Yes Site/Material Management No SC-1 Silt Fence (SF) SF-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Photograph SF-2. When silt fence is not installed along the contour, a "J-hook" installation may be appropriate to ensure that the BMP does not create concentrated flow parallel to the silt fence. Photo courtesy of Tom Gore. Maintenance and Removal Inspection of silt fence includes observing the material for tears or holes and checking for slumping fence and undercut areas bypassing flows. Repair of silt fence typically involves replacing the damaged section with a new section. Sediment accumulated behind silt fence should be removed, as needed to maintain BMP effectiveness, typically before it reaches a depth of 6 inches. Silt fence may be removed when the upstream area has reached final stabilization. Silt Fence (SF) SC-1 November 2010 Urban Drainage and Flood Control District SF-3 Urban Storm Drainage Criteria Manual Volume 3 SC-1 Silt Fence (SF) SF-4 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Construction Fence (CF) SM-3 November 2010 Urban Drainage and Flood Control District CF-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph CF-1. A construction fence helps delineate areas where existing vegetation is being protected. Photo courtesy of Douglas County. Description A construction fence restricts site access to designated entrances and exits, delineates construction site boundaries, and keeps construction out of sensitive areas such as natural areas to be preserved as open space, wetlands and riparian areas. Appropriate Uses A construction fence can be used to delineate the site perimeter and locations within the site where access is restricted to protect natural resources such as wetlands, waterbodies, trees, and other natural areas of the site that should not be disturbed. If natural resource protection is an objective, then the construction fencing should be used in combination with other perimeter control BMPs such as silt fence, sediment control logs or similar measures. Design and Installation Construction fencing may be chain link or plastic mesh and should be installed following manufacturer’s recommendations. See Detail CF-1 for typical installations. Do not place construction fencing in areas within work limits of machinery. Maintenance and Removal  Inspect fences for damage; repair or replace as necessary.  Fencing should be tight and any areas with slumping or fallen posts should be reinstalled.  Fencing should be removed once construction is complete. Construction Fence Functions Erosion Control No Sediment Control No Site/Material Management Yes SM-3 Construction Fence (CF) CF-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Construction Fence (CF) SM-3 November 2010 Urban Drainage and Flood Control District CF-3 Urban Storm Drainage Criteria Manual Volume 3 Good Housekeeping Practices (GH) MM-3 November 2010 Urban Drainage and Flood Control District GH-1 Urban Storm Drainage Criteria Manual Volume 3 Photographs GH-1 and GH-2. Proper materials storage and secondary containment for fuel tanks are important good housekeeping practices. Photos courtesy of CDOT and City of Aurora. Description Implement construction site good housekeeping practices to prevent pollution associated with solid, liquid and hazardous construction-related materials and wastes. Stormwater Management Plans (SWMPs) should clearly specify BMPs including these good housekeeping practices:  Provide for waste management.  Establish proper building material staging areas.  Designate paint and concrete washout areas.  Establish proper equipment/vehicle fueling and maintenance practices.  Control equipment/vehicle washing and allowable non- stormwater discharges.  Develop a spill prevention and response plan. Acknowledgement: This Fact Sheet is based directly on EPA guidance provided in Developing Your Stormwater Pollution Prevent Plan (EPA 2007). Appropriate Uses Good housekeeping practices are necessary at all construction sites. Design and Installation The following principles and actions should be addressed in SWMPs:  Provide for Waste Management. Implement management procedures and practices to prevent or reduce the exposure and transport of pollutants in stormwater from solid, liquid and sanitary wastes that will be generated at the site. Practices such as trash disposal, recycling, proper material handling, and cleanup measures can reduce the potential for stormwater runoff to pick up construction site wastes and discharge them to surface waters. Implement a comprehensive set of waste-management practices for hazardous or toxic materials, such as paints, solvents, petroleum products, pesticides, wood preservatives, acids, roofing tar, and other materials. Practices should include storage, handling, inventory, and cleanup procedures, in case of spills. Specific practices that should be considered include: Solid or Construction Waste o Designate trash and bulk waste-collection areas on- site. Good Housekeeping Functions Erosion Control No Sediment Control No Site/Material Management Yes MM-3 Good Housekeeping Practices (GH) GH-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Photograph GH-3. Locate portable toilet facilities on level surfaces away from waterways and storm drains. Photo courtesy of WWE. o Recycle materials whenever possible (e.g., paper, wood, concrete, oil). o Segregate and provide proper disposal options for hazardous material wastes. o Clean up litter and debris from the construction site daily. o Locate waste-collection areas away from streets, gutters, watercourses, and storm drains. Waste- collection areas (dumpsters, and such) are often best located near construction site entrances to minimize traffic on disturbed soils. Consider secondary containment around waste collection areas to minimize the likelihood of contaminated discharges. o Empty waste containers before they are full and overflowing. Sanitary and Septic Waste o Provide convenient, well-maintained, and properly located toilet facilities on-site. o Locate toilet facilities away from storm drain inlets and waterways to prevent accidental spills and contamination of stormwater. o Maintain clean restroom facilities and empty portable toilets regularly. o Where possible, provide secondary containment pans under portable toilets. o Provide tie-downs or stake-downs for portable toilets. o Educate employees, subcontractors, and suppliers on locations of facilities. o Treat or dispose of sanitary and septic waste in accordance with state or local regulations. Do not discharge or bury wastewater at the construction site. o Inspect facilities for leaks. If found, repair or replace immediately. o Special care is necessary during maintenance (pump out) to ensure that waste and/or biocide are not spilled on the ground. Hazardous Materials and Wastes o Develop and implement employee and subcontractor education, as needed, on hazardous and toxic waste handling, storage, disposal, and cleanup. o Designate hazardous waste-collection areas on-site. o Place all hazardous and toxic material wastes in secondary containment. Good Housekeeping Practices (GH) MM-3 November 2010 Urban Drainage and Flood Control District GH-3 Urban Storm Drainage Criteria Manual Volume 3 o Hazardous waste containers should be inspected to ensure that all containers are labeled properly and that no leaks are present.  Establish Proper Building Material Handling and Staging Areas. The SWMP should include comprehensive handling and management procedures for building materials, especially those that are hazardous or toxic. Paints, solvents, pesticides, fuels and oils, other hazardous materials or building materials that have the potential to contaminate stormwater should be stored indoors or under cover whenever possible or in areas with secondary containment. Secondary containment measures prevent a spill from spreading across the site and may include dikes, berms, curbing, or other containment methods. Secondary containment techniques should also ensure the protection of groundwater. Designate staging areas for activities such as fueling vehicles, mixing paints, plaster, mortar, and other potential pollutants. Designated staging areas enable easier monitoring of the use of materials and clean up of spills. Training employees and subcontractors is essential to the success of this pollution prevention principle. Consider the following specific materials handling and staging practices: o Train employees and subcontractors in proper handling and storage practices. o Clearly designate site areas for staging and storage with signs and on construction drawings. Staging areas should be located in areas central to the construction site. Segment the staging area into sub-areas designated for vehicles, equipment, or stockpiles. Construction entrances and exits should be clearly marked so that delivery vehicles enter/exit through stabilized areas with vehicle tracking controls (See Vehicle Tracking Control Fact Sheet). o Provide storage in accordance with Spill Protection, Control and Countermeasures (SPCC) requirements and plans and provide cover and impermeable perimeter control, as necessary, for hazardous materials and contaminated soils that must be stored on site. o Ensure that storage containers are regularly inspected for leaks, corrosion, support or foundation failure, or other signs of deterioration and tested for soundness. o Reuse and recycle construction materials when possible.  Designate Concrete Washout Areas. Concrete contractors should be encouraged to use the washout facilities at their own plants or dispatch facilities when feasible; however, concrete washout commonly occurs on construction sites. If it is necessary to provide for concrete washout areas on- site, designate specific washout areas and design facilities to handle anticipated washout water. Washout areas should also be provided for paint and stucco operations. Because washout areas can be a source of pollutants from leaks or spills, care must be taken with regard to their placement and proper use. See the Concrete Washout Area Fact Sheet for detailed guidance. Both self-constructed and prefabricated washout containers can fill up quickly when concrete, paint, and stucco work are occurring on large portions of the site. Be sure to check for evidence that contractors are using the washout areas and not dumping materials onto the ground or into drainage facilities. If the washout areas are not being used regularly, consider posting additional signage, relocating the facilities to more convenient locations, or providing training to workers and contractors. When concrete, paint, or stucco is part of the construction process, consider these practices which will help prevent contamination of stormwater. Include the locations of these areas and the maintenance and inspection procedures in the SWMP. MM-3 Good Housekeeping Practices (GH) GH-4 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 o Do not washout concrete trucks or equipment into storm drains, streets, gutters, uncontained areas, or streams. Only use designated washout areas. o Establish washout areas and advertise their locations with signs. Ensure that signage remains in good repair. o Provide adequate containment for the amount of wash water that will be used. o Inspect washout structures daily to detect leaks or tears and to identify when materials need to be removed. o Dispose of materials properly. The preferred method is to allow the water to evaporate and to recycle the hardened concrete. Full service companies may provide dewatering services and should dispose of wastewater properly. Concrete wash water can be highly polluted. It should not be discharged to any surface water, storm sewer system, or allowed to infiltrate into the ground in the vicinity of waterbodies. Washwater should not be discharged to a sanitary sewer system without first receiving written permission from the system operator.  Establish Proper Equipment/Vehicle Fueling and Maintenance Practices. Create a clearly designated on-site fueling and maintenance area that is clean and dry. The on-site fueling area should have a spill kit, and staff should know how to use it. If possible, conduct vehicle fueling and maintenance activities in a covered area. Consider the following practices to help prevent the discharge of pollutants to stormwater from equipment/vehicle fueling and maintenance. Include the locations of designated fueling and maintenance areas and inspection and maintenance procedures in the SWMP. o Train employees and subcontractors in proper fueling procedures (stay with vehicles during fueling, proper use of pumps, emergency shutoff valves, etc.). o Inspect on-site vehicles and equipment regularly for leaks, equipment damage, and other service problems. o Clearly designate vehicle/equipment service areas away from drainage facilities and watercourses to prevent stormwater run-on and runoff. o Use drip pans, drip cloths, or absorbent pads when replacing spent fluids. o Collect all spent fluids, store in appropriate labeled containers in the proper storage areas, and recycle fluids whenever possible.  Control Equipment/Vehicle Washing and Allowable Non-Stormwater Discharges. Implement practices to prevent contamination of surface and groundwater from equipment and vehicle wash water. Representative practices include: o Educate employees and subcontractors on proper washing procedures. o Use off-site washing facilities, when available. o Clearly mark the washing areas and inform workers that all washing must occur in this area. o Contain wash water and treat it using BMPs. Infiltrate washwater when possible, but maintain separation from drainage paths and waterbodies. Good Housekeeping Practices (GH) MM-3 November 2010 Urban Drainage and Flood Control District GH-5 Urban Storm Drainage Criteria Manual Volume 3 o Use high-pressure water spray at vehicle washing facilities without detergents. Water alone can remove most dirt adequately. o Do not conduct other activities, such as vehicle repairs, in the wash area. o Include the location of the washing facilities and the inspection and maintenance procedures in the SWMP.  Develop a Spill Prevention and Response Plan. Spill prevention and response procedures must be identified in the SWMP. Representative procedures include identifying ways to reduce the chance of spills, stop the source of spills, contain and clean up spills, dispose of materials contaminated by spills, and train personnel responsible for spill prevention and response. The plan should also specify material handling procedures and storage requirements and ensure that clear and concise spill cleanup procedures are provided and posted for areas in which spills may potentially occur. When developing a spill prevention plan, include the following: o Note the locations of chemical storage areas, storm drains, tributary drainage areas, surface waterbodies on or near the site, and measures to stop spills from leaving the site. o Provide proper handling and safety procedures for each type of waste. Keep Material Safety Data Sheets (MSDSs) for chemical used on site with the SWMP. o Establish an education program for employees and subcontractors on the potential hazards to humans and the environment from spills and leaks. o Specify how to notify appropriate authorities, such as police and fire departments, hospitals, or municipal sewage treatment facilities to request assistance. Emergency procedures and contact numbers should be provided in the SWMP and posted at storage locations. o Describe the procedures, equipment and materials for immediate cleanup of spills and proper disposal. o Identify personnel responsible for implementing the plan in the event of a spill. Update the spill prevention plan and clean up materials as changes occur to the types of chemicals stored and used at the facility. MM-3 Good Housekeeping Practices (GH) GH-6 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Spill Prevention, Control, and Countermeasure (SPCC) Plan Construction sites may be subject to 40 CFR Part 112 regulations that require the preparation and implementation of a SPCC Plan to prevent oil spills from aboveground and underground storage tanks. The facility is subject to this rule if it is a non-transportation-related facility that:  Has a total storage capacity greater than 1,320 gallons or a completely buried storage capacity greater than 42,000 gallons.  Could reasonably be expected to discharge oil in quantities that may be harmful to navigable waters of the United States and adjoining shorelines. Furthermore, if the facility is subject to 40 CFR Part 112, the SWMP should reference the SPCC Plan. To find out more about SPCC Plans, see EPA's website on SPPC at www.epa.gov/oilspill/spcc.htm. Reporting Oil Spills In the event of an oil spill, contact the National Response Center toll free at 1-800-424- 8802 for assistance, or for more details, visit their website: www.nrc.uscg.mil. Maintenance and Removal Effective implementation of good housekeeping practices is dependent on clear designation of personnel responsible for supervising and implementing good housekeeping programs, such as site cleanup and disposal of trash and debris, hazardous material management and disposal, vehicle and equipment maintenance, and other practices. Emergency response "drills" may aid in emergency preparedness. Checklists may be helpful in good housekeeping efforts. Staging and storage areas require permanent stabilization when the areas are no longer being used for construction-related activities. Construction-related materials, debris and waste must be removed from the construction site once construction is complete. Design Details See the following Fact Sheets for related Design Details: MM-1 Concrete Washout Area MM-2 Stockpile Management SM-4 Vehicle Tracking Control Design details are not necessary for other good housekeeping practices; however, be sure to designate where specific practices will occur on the appropriate construction drawings. Vehicle Tracking Control (VTC) SM-4 November 2010 Urban Drainage and Flood Control District VTC-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph VTC-1. A vehicle tracking control pad constructed with properly sized rock reduces off-site sediment tracking. Description Vehicle tracking controls provide stabilized construction site access where vehicles exit the site onto paved public roads. An effective vehicle tracking control helps remove sediment (mud or dirt) from vehicles, reducing tracking onto the paved surface. Appropriate Uses Implement a stabilized construction entrance or vehicle tracking control where frequent heavy vehicle traffic exits the construction site onto a paved roadway. An effective vehicle tracking control is particularly important during the following conditions:  Wet weather periods when mud is easily tracked off site.  During dry weather periods where dust is a concern.  When poorly drained, clayey soils are present on site. Although wheel washes are not required in designs of vehicle tracking controls, they may be needed at particularly muddy sites. Design and Installation Construct the vehicle tracking control on a level surface. Where feasible, grade the tracking control towards the construction site to reduce off-site runoff. Place signage, as needed, to direct construction vehicles to the designated exit through the vehicle tracking control. There are several different types of stabilized construction entrances including: VTC-1. Aggregate Vehicle Tracking Control. This is a coarse-aggregate surfaced pad underlain by a geotextile. This is the most common vehicle tracking control, and when properly maintained can be effective at removing sediment from vehicle tires. VTC-2. Vehicle Tracking Control with Construction Mat or Turf Reinforcement Mat. This type of control may be appropriate for site access at very small construction sites with low traffic volume over vegetated areas. Although this application does not typically remove sediment from vehicles, it helps protect existing vegetation and provides a stabilized entrance. Vehicle Tracking Control Functions Erosion Control Moderate Sediment Control Yes Site/Material Management Yes SM-4 Vehicle Tracking Control (VTC) VTC-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Photograph VTC-2. A vehicle tracking control pad with wheel wash facility. Photo courtesy of Tom Gore. VTC-3. Stabilized Construction Entrance/Exit with Wheel Wash. This is an aggregate pad, similar to VTC-1, but includes equipment for tire washing. The wheel wash equipment may be as simple as hand-held power washing equipment to more advance proprietary systems. When a wheel wash is provided, it is important to direct wash water to a sediment trap prior to discharge from the site. Vehicle tracking controls are sometimes installed in combination with a sediment trap to treat runoff. Maintenance and Removal Inspect the area for degradation and replace aggregate or material used for a stabilized entrance/exit as needed. If the area becomes clogged and ponds water, remove and dispose of excess sediment or replace material with a fresh layer of aggregate as necessary. With aggregate vehicle tracking controls, ensure rock and debris from this area do not enter the public right-of-way. Remove sediment that is tracked onto the public right of way daily or more frequently as needed. Excess sediment in the roadway indicates that the stabilized construction entrance needs maintenance. Ensure that drainage ditches at the entrance/exit area remain clear. A stabilized entrance should be removed only when there is no longer the potential for vehicle tracking to occur. This is typically after the site has been stabilized. When wheel wash equipment is used, be sure that the wash water is discharged to a sediment trap prior to discharge. Also inspect channels conveying the water from the wash area to the sediment trap and stabilize areas that may be eroding. When a construction entrance/exit is removed, excess sediment from the aggregate should be removed and disposed of appropriately. The entrance should be promptly stabilized with a permanent surface following removal, typically by paving. Vehicle Tracking Control (VTC) SM-4 November 2010 Urban Drainage and Flood Control District VTC-3 Urban Storm Drainage Criteria Manual Volume 3 SM-4 Vehicle Tracking Control (VTC) VTC-4 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Vehicle Tracking Control (VTC) SM-4 November 2010 Urban Drainage and Flood Control District VTC-5 Urban Storm Drainage Criteria Manual Volume 3 PAGE 1 OF 2 8. Temporary Berm (TB) 1. DESCRIPTION: Temporary Berms are temporary control measure barriers made of compacted subsoil or other approved materials such as embankment or sand bags. Their function is to intercept and divert sheet surface runoff away from areas not yet stabilized, prevent erosion, manage sheet flow, and reduce sediment transport. 2. CONTROL MEASURE USES ☒ Erosion Control ☒ Sediment Control ☐ Site/Materials Management 3. RELEVANT SPECIFICATION SECTIONS Section 208 – Erosion Control a) 208.05 (d) – Construction BMPS b) 208.11 – Method of Measurement 4. RELEVANT M-STANDARD DETAILS M-208-1, Sheet 7 of 11 (Grading Applications) 5. BASIS OF PAYMENT Pay item Description Pay Unit 208-00300 Temporary Berm LF 6. APPLICATIONS • May be constructed across roadways (transverse berm) at a slight angle with respect to the centerline. • May be constructed along the top edge of fill slopes or below the toe of exposed and erodible slopes (upslope or downslope side of a construction area). They can also be used at storm drain inlets (when approved) and across minor swales and ditches. • May be used to construct Rough Cut Street Control measures. • May be used to divert surface sheet flows from areas where flows may damage property or interfere with establishment of vegetation. • May be used to divert surface runoff to other control measures like Sediment Traps. Temporary Berm along access road • May be used on relatively flat slopes to capture surface runoff to shorten the overall slope length before it has a chance to concentrate and cause rill and gully erosion 7. LIMITATIONS • Only to be used as a temporary measure on flat areas with slopes less than 2H:1V. • Must use a secondary erosion control measure device when sediment control is an objective. • Susceptible to erosion when intercepted concentrated flows have high velocities. 8. SOILS TRIANGLE PAGE 2 OF 2 8. Temporary Berm (TB) 9. SWMP ADMINISTRATOR FOR DESIGN CRITERIA • Temporary Berm: o Berm must be at least 18 inches tall or high enough to prevent overtopping. o Berm must have a minimum of 4- to 6-foot base. o Gradient of all receiving area above berm must be less than 2:1, or flatter. o Berms must be designed so that flow line of water is at a gradient of less than 3 percent. Greater than 3 percent may require the use of Check Dams in the flow line behind the berm. o Outlets of anticipated flow from captured water behind berms must be designed with additional control measures suitable to control concentrated flow. Maximum drainage area for each outlet must be limited to 2 acres. o Berms installed taller than 2 feet require additional control measures at the toe opposite of the conveyance side. 10. INSTALLATION CRITERIA • Construct Temporary Berm using native subsoil materials that can be compacted. Topsoil may not be used to construct these structures. • Temporary Berm must be compacted manually or by mechanical means. • The berms shall be constructed at regular intervals along the road and shall be perpendicular to the longitudinal slope from the outer edge of the swale to the crown of the road. 11. MAINTENANCE AND REMOVAL • When upstream area is stabilized, Temporary Berms may be removed. Disturbed area around control measure must be cleared of any debris or sediment, receive subgrade soil preparation, and be seeded and mulched. • Removed material for Temporary Berms may be distributed on-site at a location approved by the Engineer. • Inspect Temporary Berms on a daily basis for signs of erosion, stability, and compaction. Whenever erosion is spotted, replace lost material and recompact berm to match original conditions. • If intensive maintenance is necessary to keep this control measure functional, consider using a different control measure device (see Silt Dike [fact sheet No. 19] or Erosion Logs [fact sheet No. 17]. Concrete Washout Area (CWA) MM-1 November 2010 Urban Drainage and Flood Control District CWA-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph CWA-1. Example of concrete washout area. Note gravel tracking pad for access and sign. Description Concrete waste management involves designating and properly managing a specific area of the construction site as a concrete washout area. A concrete washout area can be created using one of several approaches designed to receive wash water from washing of tools and concrete mixer chutes, liquid concrete waste from dump trucks, mobile batch mixers, or pump trucks. Three basic approaches are available: excavation of a pit in the ground, use of an above ground storage area, or use of prefabricated haul- away concrete washout containers. Surface discharges of concrete washout water from construction sites are prohibited. Appropriate Uses Concrete washout areas must be designated on all sites that will generate concrete wash water or liquid concrete waste from onsite concrete mixing or concrete delivery. Because pH is a pollutant of concern for washout activities, when unlined pits are used for concrete washout, the soil must have adequate buffering capacity to result in protection of state groundwater standards; otherwise, a liner/containment must be used. The following management practices are recommended to prevent an impact from unlined pits to groundwater:  The use of the washout site should be temporary (less than 1 year), and  The washout site should be not be located in an area where shallow groundwater may be present, such as near natural drainages, springs, or wetlands. Design and Installation Concrete washout activities must be conducted in a manner that does not contribute pollutants to surface waters or stormwater runoff. Concrete washout areas may be lined or unlined excavated pits in the ground, commercially manufactured prefabricated washout containers, or aboveground holding areas constructed of berms, sandbags or straw bales with a plastic liner. Although unlined washout areas may be used, lined pits may be required to protect groundwater under certain conditions. Do not locate an unlined washout area within 400 feet of any natural drainage pathway or waterbody or within 1,000 feet of any wells or drinking water sources. Even for lined concrete washouts, it is advisable to locate the facility away from waterbodies and drainage paths. If site constraints make these Concrete Washout Area Functions Erosion Control No Sediment Control No Site/Material Management Yes MM-1 Concrete Washout Area (CWA) CWA-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 setbacks infeasible or if highly permeable soils exist in the area, then the pit must be installed with an impermeable liner (16 mil minimum thickness) or surface storage alternatives using prefabricated concrete washout devices or a lined aboveground storage area should be used. Design details with notes are provided in Detail CWA-1 for pits and CWA-2 for aboveground storage areas. Pre-fabricated concrete washout container information can be obtained from vendors. Maintenance and Removal A key consideration for concrete washout areas is to ensure that adequate signage is in place identifying the location of the washout area. Part of inspecting and maintaining washout areas is ensuring that adequate signage is provided and in good repair and that the washout area is being used, as opposed to washout in non-designated areas of the site. Remove concrete waste in the washout area, as needed to maintain BMP function (typically when filled to about two-thirds of its capacity). Collect concrete waste and deliver offsite to a designated disposal location. Upon termination of use of the washout site, accumulated solid waste, including concrete waste and any contaminated soils, must be removed from the site to prevent on-site disposal of solid waste. If the wash water is allowed to evaporate and the concrete hardens, it may be recycled. Photograph CWA-3. Earthen concrete washout. Photo courtesy of CDOT. Photograph CWA-2. Prefabricated concrete washout. Photo courtesy of CDOT. Concrete Washout Area (CWA) MM-1 November 2010 Urban Drainage and Flood Control District CWA-3 Urban Storm Drainage Criteria Manual Volume 3 MM-1 Concrete Washout Area (CWA) CWA-4 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Temporary and Permanent Seeding (TS/PS) EC-2 June 2012 Urban Drainage and Flood Control District TS/PS-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph TS/PS -1. Equipment used to drill seed. Photo courtesy of Douglas County. Description Temporary seeding can be used to stabilize disturbed areas that will be inactive for an extended period. Permanent seeding should be used to stabilize areas at final grade that will not be otherwise stabilized. Effective seeding includes preparation of a seedbed, selection of an appropriate seed mixture, proper planting techniques, and protection of the seeded area with mulch, geotextiles, or other appropriate measures. Appropriate Uses When the soil surface is disturbed and will remain inactive for an extended period (typically 30 days or longer), proactive stabilization measures should be implemented. If the inactive period is short-lived (on the order of two weeks), techniques such as surface roughening may be appropriate. For longer periods of inactivity, temporary seeding and mulching can provide effective erosion control. Permanent seeding should be used on finished areas that have not been otherwise stabilized. Typically, local governments have their own seed mixes and timelines for seeding. Check jurisdictional requirements for seeding and temporary stabilization. Design and Installation Effective seeding requires proper seedbed preparation, selection of an appropriate seed mixture, use of appropriate seeding equipment to ensure proper coverage and density, and protection with mulch or fabric until plants are established. The USDCM Volume 2 Revegetation Chapter contains detailed seed mix, soil preparations, and seeding and mulching recommendations that may be referenced to supplement this Fact Sheet. Drill seeding is the preferred seeding method. Hydroseeding is not recommended except in areas where steep slopes prevent use of drill seeding equipment, and even in these instances it is preferable to hand seed and mulch. Some jurisdictions do not allow hydroseeding or hydromulching. Seedbed Preparation Prior to seeding, ensure that areas to be revegetated have soil conditions capable of supporting vegetation. Overlot grading can result in loss of topsoil, resulting in poor quality subsoils at the ground surface that have low nutrient value, little organic matter content, few soil microorganisms, rooting restrictions, and conditions less conducive to infiltration of precipitation. As a result, it is typically necessary to provide stockpiled topsoil, compost, or other Temporary and Permanent Seeding Functions Erosion Control Yes Sediment Control No Site/Material Management No EC-2 Temporary and Permanent Seeding (TS/PS) TS/PS-2 Urban Drainage and Flood Control District June 2012 Urban Storm Drainage Criteria Manual Volume 3 soil amendments and rototill them into the soil to a depth of 6 inches or more. Topsoil should be salvaged during grading operations for use and spread on areas to be revegetated later. Topsoil should be viewed as an important resource to be utilized for vegetation establishment, due to its water-holding capacity, structure, texture, organic matter content, biological activity, and nutrient content. The rooting depth of most native grasses in the semi-arid Denver metropolitan area is 6 to 18 inches. At a minimum, the upper 6 inches of topsoil should be stripped, stockpiled, and ultimately respread across areas that will be revegetated. Where topsoil is not available, subsoils should be amended to provide an appropriate plant-growth medium. Organic matter, such as well digested compost, can be added to improve soil characteristics conducive to plant growth. Other treatments can be used to adjust soil pH conditions when needed. Soil testing, which is typically inexpensive, should be completed to determine and optimize the types and amounts of amendments that are required. If the disturbed ground surface is compacted, rip or rototill the surface prior to placing topsoil. If adding compost to the existing soil surface, rototilling is necessary. Surface roughening will assist in placement of a stable topsoil layer on steeper slopes, and allow infiltration and root penetration to greater depth. Prior to seeding, the soil surface should be rough and the seedbed should be firm, but neither too loose nor compacted. The upper layer of soil should be in a condition suitable for seeding at the proper depth and conducive to plant growth. Seed-to-soil contact is the key to good germination. Seed Mix for Temporary Vegetation To provide temporary vegetative cover on disturbed areas which will not be paved, built upon, or fully landscaped or worked for an extended period (typically 30 days or more), plant an annual grass appropriate for the time of planting and mulch the planted areas. Annual grasses suitable for the Denver metropolitan area are listed in Table TS/PS-1. These are to be considered only as general recommendations when specific design guidance for a particular site is not available. Local governments typically specify seed mixes appropriate for their jurisdiction. Seed Mix for Permanent Revegetation To provide vegetative cover on disturbed areas that have reached final grade, a perennial grass mix should be established. Permanent seeding should be performed promptly (typically within 14 days) after reaching final grade. Each site will have different characteristics and a landscape professional or the local jurisdiction should be contacted to determine the most suitable seed mix for a specific site. In lieu of a specific recommendation, one of the perennial grass mixes appropriate for site conditions and growth season listed in Table TS/PS-2 can be used. The pure live seed (PLS) rates of application recommended in these tables are considered to be absolute minimum rates for seed applied using proper drill-seeding equipment. If desired for wildlife habitat or landscape diversity, shrubs such as rubber rabbitbrush (Chrysothamnus nauseosus), fourwing saltbush (Atriplex canescens) and skunkbrush sumac (Rhus trilobata) could be added to the upland seedmixes at 0.25, 0.5 and 1 pound PLS/acre, respectively. In riparian zones, planting root stock of such species as American plum (Prunus americana), woods rose (Rosa woodsii), plains cottonwood (Populus sargentii), and willow (Populus spp.) may be considered. On non-topsoiled upland sites, a legume such as Ladak alfalfa at 1 pound PLS/acre can be included as a source of nitrogen for perennial grasses. Temporary and Permanent Seeding (TS/PS) EC-2 June 2012 Urban Drainage and Flood Control District TS/PS-3 Urban Storm Drainage Criteria Manual Volume 3 Seeding dates for the highest success probability of perennial species along the Front Range are generally in the spring from April through early May and in the fall after the first of September until the ground freezes. If the area is irrigated, seeding may occur in summer months, as well. See Table TS/PS-3 for appropriate seeding dates. Table TS/PS-1. Minimum Drill Seeding Rates for Various Temporary Annual Grasses Speciesa (Common name) Growth Seasonb Pounds of Pure Live Seed (PLS)/acrec Planting Depth (inches) 1. Oats Cool 35 - 50 1 - 2 2. Spring wheat Cool 25 - 35 1 - 2 3. Spring barley Cool 25 - 35 1 - 2 4. Annual ryegrass Cool 10 - 15 ½ 5. Millet Warm 3 - 15 ½ - ¾ 6. Sudangrass Warm 5–10 ½ - ¾ 7. Sorghum Warm 5–10 ½ - ¾ 8. Winter wheat Cool 20–35 1 - 2 9. Winter barley Cool 20–35 1 - 2 10. Winter rye Cool 20–35 1 - 2 11. Triticale Cool 25–40 1 - 2 a Successful seeding of annual grass resulting in adequate plant growth will usually produce enough dead-plant residue to provide protection from wind and water erosion for an additional year. This assumes that the cover is not disturbed or mowed closer than 8 inches. Hydraulic seeding may be substituted for drilling only where slopes are steeper than 3:1 or where access limitations exist. When hydraulic seeding is used, hydraulic mulching should be applied as a separate operation, when practical, to prevent the seeds from being encapsulated in the mulch. b See Table TS/PS-3 for seeding dates. Irrigation, if consistently applied, may extend the use of cool season species during the summer months. c Seeding rates should be doubled if seed is broadcast, or increased by 50 percent if done using a Brillion Drill or by hydraulic seeding. EC-2 Temporary and Permanent Seeding (TS/PS) TS/PS-4 Urban Drainage and Flood Control District June 2012 Urban Storm Drainage Criteria Manual Volume 3 Table TS/PS-2. Minimum Drill Seeding Rates for Perennial Grasses Commona Name Botanical Name Growth Seasonb Growth Form Seeds/ Pound Pounds of PLS/acre Alakali Soil Seed Mix Alkali sacaton Sporobolus airoides Cool Bunch 1,750,000 0.25 Basin wildrye Elymus cinereus Cool Bunch 165,000 2.5 Sodar streambank wheatgrass Agropyron riparium 'Sodar' Cool Sod 170,000 2.5 Jose tall wheatgrass Agropyron elongatum 'Jose' Cool Bunch 79,000 7.0 Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 5.5 Total 17.75 Fertile Loamy Soil Seed Mix Ephriam crested wheatgrass Agropyron cristatum 'Ephriam' Cool Sod 175,000 2.0 Dural hard fescue Festuca ovina 'duriuscula' Cool Bunch 565,000 1.0 Lincoln smooth brome Bromus inermis leyss 'Lincoln' Cool Sod 130,000 3.0 Sodar streambank wheatgrass Agropyron riparium 'Sodar' Cool Sod 170,000 2.5 Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 7.0 Total 15.5 High Water Table Soil Seed Mix Meadow foxtail Alopecurus pratensis Cool Sod 900,000 0.5 Redtop Agrostis alba Warm Open sod 5,000,000 0.25 Reed canarygrass Phalaris arundinacea Cool Sod 68,000 0.5 Lincoln smooth brome Bromus inermis leyss 'Lincoln' Cool Sod 130,000 3.0 Pathfinder switchgrass Panicum virgatum 'Pathfinder' Warm Sod 389,000 1.0 Alkar tall wheatgrass Agropyron elongatum 'Alkar' Cool Bunch 79,000 5.5 Total 10.75 Transition Turf Seed Mixc Ruebens Canadian bluegrass Poa compressa 'Ruebens' Cool Sod 2,500,000 0.5 Dural hard fescue Festuca ovina 'duriuscula' Cool Bunch 565,000 1.0 Citation perennial ryegrass Lolium perenne 'Citation' Cool Sod 247,000 3.0 Lincoln smooth brome Bromus inermis leyss 'Lincoln' Cool Sod 130,000 3.0 Total 7.5 Temporary and Permanent Seeding (TS/PS) EC-2 June 2012 Urban Drainage and Flood Control District TS/PS-5 Urban Storm Drainage Criteria Manual Volume 3 Table TS/PS-2. Minimum Drill Seeding Rates for Perennial Grasses (cont.) Common Name Botanical Name Growth Seasonb Growth Form Seeds/ Pound Pounds of PLS/acre Sandy Soil Seed Mix Blue grama Bouteloua gracilis Warm Sod-forming bunchgrass 825,000 0.5 Camper little bluestem Schizachyrium scoparium 'Camper' Warm Bunch 240,000 1.0 Prairie sandreed Calamovilfa longifolia Warm Open sod 274,000 1.0 Sand dropseed Sporobolus cryptandrus Cool Bunch 5,298,000 0.25 Vaughn sideoats grama Bouteloua curtipendula 'Vaughn' Warm Sod 191,000 2.0 Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 5.5 Total 10.25 Heavy Clay, Rocky Foothill Seed Mix Ephriam crested wheatgrassd Agropyron cristatum 'Ephriam' Cool Sod 175,000 1.5 Oahe Intermediate wheatgrass Agropyron intermedium 'Oahe' Cool Sod 115,000 5.5 Vaughn sideoats gramae Bouteloua curtipendula 'Vaughn' Warm Sod 191,000 2.0 Lincoln smooth brome Bromus inermis leyss 'Lincoln' Cool Sod 130,000 3.0 Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 5.5 Total 17.5 a All of the above seeding mixes and rates are based on drill seeding followed by crimped straw mulch. These rates should be doubled if seed is broadcast and should be increased by 50 percent if the seeding is done using a Brillion Drill or is applied through hydraulic seeding. Hydraulic seeding may be substituted for drilling only where slopes are steeper than 3:1. If hydraulic seeding is used, hydraulic mulching should be done as a separate operation. b See Table TS/PS-3 for seeding dates. c If site is to be irrigated, the transition turf seed rates should be doubled. d Crested wheatgrass should not be used on slopes steeper than 6H to 1V. e Can substitute 0.5 lbs PLS of blue grama for the 2.0 lbs PLS of Vaughn sideoats grama. EC-2 Temporary and Permanent Seeding (TS/PS) TS/PS-6 Urban Drainage and Flood Control District June 2012 Urban Storm Drainage Criteria Manual Volume 3 Table TS/PS-3. Seeding Dates for Annual and Perennial Grasses Annual Grasses (Numbers in table reference species in Table TS/PS-1) Perennial Grasses Seeding Dates Warm Cool Warm Cool January 1–March 15   March 16–April 30 4 1,2,3   May 1–May 15 4  May 16–June 30 4,5,6,7 July 1–July 15 5,6,7 July 16–August 31 September 1–September 30 8,9,10,11 October 1–December 31   Mulch Cover seeded areas with mulch or an appropriate rolled erosion control product to promote establishment of vegetation. Anchor mulch by crimping, netting or use of a non-toxic tackifier. See the Mulching BMP Fact Sheet for additional guidance. Maintenance and Removal Monitor and observe seeded areas to identify areas of poor growth or areas that fail to germinate. Reseed and mulch these areas, as needed. An area that has been permanently seeded should have a good stand of vegetation within one growing season if irrigated and within three growing seasons without irrigation in Colorado. Reseed portions of the site that fail to germinate or remain bare after the first growing season. Seeded areas may require irrigation, particularly during extended dry periods. Targeted weed control may also be necessary. Protect seeded areas from construction equipment and vehicle access. Stabilized Staging Area (SSA) SM-6 November 2010 Urban Drainage and Flood Control District SSA-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph SSA-1. Example of a staging area with a gravel surface to prevent mud tracking and reduce runoff. Photo courtesy of Douglas County. Description A stabilized staging area is a clearly designated area where construction equipment and vehicles, stockpiles, waste bins, and other construction-related materials are stored. The contractor office trailer may also be located in this area. Depending on the size of the construction site, more than one staging area may be necessary. Appropriate Uses Most construction sites will require a staging area, which should be clearly designated in SWMP drawings. The layout of the staging area may vary depending on the type of construction activity. Staging areas located in roadways due to space constraints require special measures to avoid materials being washed into storm inlets. Design and Installation Stabilized staging areas should be completed prior to other construction activities beginning on the site. Major components of a stabilized staging area include:  Appropriate space to contain storage and provide for loading/unloading operations, as well as parking if necessary.  A stabilized surface, either paved or covered, with 3-inch diameter aggregate or larger.  Perimeter controls such as silt fence, sediment control logs, or other measures.  Construction fencing to prevent unauthorized access to construction materials.  Provisions for Good Housekeeping practices related to materials storage and disposal, as described in the Good Housekeeping BMP Fact Sheet.  A stabilized construction entrance/exit, as described in the Vehicle Tracking Control BMP Fact Sheet, to accommodate traffic associated with material delivery and waste disposal vehicles. Over -sizing the stabilized staging area may result in disturbance of existing vegetation in excess of that required for the project. This increases costs, as well as requirements for long-term stabilization following the construction period. When designing the stabilized staging area, minimize the area of disturbance to the extent practical. Stabilized Staging Area Functions Erosion Control Yes Sediment Control Moderate Site/Material Yes SM-6 Stabilized Staging Area (SSA) SSA-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 See Detail SSA-1 for a typical stabilized staging area and SSA-2 for a stabilized staging area when materials staging in roadways is required. Maintenance and Removal Maintenance of stabilized staging areas includes maintaining a stable surface cover of gravel, repairing perimeter controls, and following good housekeeping practices. When construction is complete, debris, unused stockpiles and materials should be recycled or properly disposed. In some cases, this will require disposal of contaminated soil from equipment leaks in an appropriate landfill. Staging areas should then be permanently stabilized with vegetation or other surface cover planned for the development. Minimizing Long-Term Stabilization Requirements  Utilize off-site parking and restrict vehicle access to the site.  Use construction mats in lieu of rock when staging is provided in an area that will not be disturbed otherwise.  Consider use of a bermed contained area for materials and equipment that do not require a stabilized surface.  Consider phasing of staging areas to avoid disturbance in an area that will not be otherwise disturbed. Stabilized Staging Area (SSA) SM-6 November 2010 Urban Drainage and Flood Control District SSA-3 Urban Storm Drainage Criteria Manual Volume 3 SM-6 Stabilized Staging Area (SSA) SSA-4 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Stockpile Management (SP) MM-2 November 2010 Urban Drainage and Flood Control District SP-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph SP-1. A topsoil stockpile that has been partially revegetated and is protected by silt fence perimeter control. Description Stockpile management includes measures to minimize erosion and sediment transport from soil stockpiles. Appropriate Uses Stockpile management should be used when soils or other erodible materials are stored at the construction site. Special attention should be given to stockpiles in close proximity to natural or manmade storm systems. Design and Installation Locate stockpiles away from all drainage system components including storm sewer inlets. Where practical, choose stockpile locations that that will remain undisturbed for the longest period of time as the phases of construction progress. Place sediment control BMPs around the perimeter of the stockpile, such as sediment control logs, rock socks, silt fence, straw bales and sand bags. See Detail SP-1 for guidance on proper establishment of perimeter controls around a stockpile. For stockpiles in active use, provide a stabilized designated access point on the upgradient side of the stockpile. Stabilize the stockpile surface with surface roughening, temporary seeding and mulching, erosion control blankets, or soil binders. Soils stockpiled for an extended period (typically for more than 60 days) should be seeded and mulched with a temporary grass cover once the stockpile is placed (typically within 14 days). Use of mulch only or a soil binder is acceptable if the stockpile will be in place for a more limited time period (typically 30-60 days). Timeframes for stabilization of stockpiles noted in this fact sheet are "typical" guidelines. Check permit requirements for specific federal, state, and/or local requirements that may be more prescriptive. Stockpiles should not be placed in streets or paved areas unless no other practical alternative exists. See the Stabilized Staging Area Fact Sheet for guidance when staging in roadways is unavoidable due to space or right-of-way constraints. For paved areas, rock socks must be used for perimeter control and all inlets with the potential to receive sediment from the stockpile (even from vehicle tracking) must be protected. Maintenance and Removal Inspect perimeter controls and inlet protection in accordance with their respective BMP Fact Sheets. Where seeding, mulch and/or soil binders are used, reseeding or reapplication of soil binder may be necessary. When temporary removal of a perimeter BMP is necessary to access a stockpile, ensure BMPs are reinstalled in accordance with their respective design detail section. Stockpile Management Functions Erosion Control Yes Sediment Control Yes Site/Material Management Yes MM-2 Stockpile Management (SM) SP-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 When the stockpile is no longer needed, properly dispose of excess materials and revegetate or otherwise stabilize the ground surface where the stockpile was located. Stockpile Management (SP) MM-2 November 2010 Urban Drainage and Flood Control District SP-3 Urban Storm Drainage Criteria Manual Volume 3 MM-2 Stockpile Management (SM) SP-4 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Stockpile Management (SP) MM-2 November 2010 Urban Drainage and Flood Control District SP-5 Urban Storm Drainage Criteria Manual Volume 3 Appendix F - Colorado Discharge Permit System (CDPS) Application For Agency Use Only Permit Number Assigned COR03-__________________________ Date Received ______/______/______ MM DD YYYY COLORADO DISCHARGE PERMIT SYSTEM (CDPS) STORMWATER DISCHARGE ASSOCIATED WITH CONSTRUCTION ACTIVITIES APPLICATION PHOTO COPIES, FAXED COPIES, PDF COPIES OR EMAILS WILL NOT BE ACCEPTED. Please print or type. Original signatures are required. All items must be completed accurately and in their entirety for the application to be deemed complete. Incomplete applications will not be processed until all information is received which will ultimately delay the issuance of a permit. If more space is required to answer any question, please attach additional sheets to the application form. Applications must be submitted by mail or hand delivered to: Colorado Department of Public Health and Environment Water Quality Control Division 4300 Cherry Creek Drive South WQCD-WQPS-B2 Denver, CO 80246-1530 Any additional information that you would like the Division to consider in developing the permit should be provided with the application. Examples include effluent data and/or modeling and planned pollutant removal strategies. Responsible Person (Title): * PERMITTEE (if more than one please add additional pages) COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT Dedicated to protecting and improving the health and environment of the people of Colorado Water Quality Control Division 4300 Cherry Creek Drive South WQCD-WQPS-B2 Denver, CO 80246-1530 (303) 692– 3500 www.coloradowaterpermits.com PERMIT INFORMATION Reason for Application: NEW CERT RENEW CERT EXISTING CERT# Applicant is: Property Owner Contractor/Operator A. CONTACT INFORMATION—NOT ALL CONTACTS MAY APPLY *indicates required * ORGANIZATION FORMAL NAME: 1) * PERMITTEE CONTACT the person authorized to sign and certify the permit application. This person receives all permit correspondences and is the person responsible for ensuring compliance with the permit. Currently Held By (Person): FirstName: LastName: Telephone: Email Address: Organization: Mailing Address: City: State: Zip Code: This form must be signed by the Permittee (listed in item 1) to be considered complete. Per Regulation 61 In all cases, it shall be signed as follows: In the case of corporations, by a responsible corporate officer. For the purposes of this section, the responsible corporate officer is responsible for the overall operation of the facility from which the discharge described in the application originates. In the case of a partnership, by a general partner. In the case of a sole proprietorship, by the proprietor. In the case of a municipal, state, or other public facility, by either a principal executive officer or ranking elected official. SW Construction Application for: page 1 of 5 HOW TO COMPLETE THIS APPLICATION 1. Online via web browser. You must use Internet Explorer (version 8 and above). All other browsers disable the electronic submission features. OR 2. Download and save this form to your computer. Then open Adobe Reader (or Acrobat), select File, then Open and navigate to where the form is saved. This is the best option if using a Mac computer (Do not use the Mac Preview program). Responsible Person (Title): 2) DMR COGNIZANT OFFICIAL (i.e. authorized agent) the person or position authorized to sign and certify reports required by the Division including Discharge Monitoring Reports *DMR’s, Annual Reports, Compliance Schedule submittals, and other information requested by the Division. The Division will transmit pre-printed reports (ie. DMR’s) to this person. If more than one, please add additional pages. Currently Held By (Person): FirstName: LastName: Telephone: Email Address: Organization: Mailing Address: City: State: Zip Code: Same as 1) Permittee Per Regulation 61 : All reports required by permits, and other information requested by the Division shall be signed by the permittee or by a duly authorized representative of that person. A person is a duly authorized representative only if: i.The authorization is made in writing by the permittee. ii.The authorization specifies either an individual or a position having responsibility for the overall operation of the regulated facility or activity such as the position of plant manager, operator of a well or a well field, superintendent, position of equivalent responsibility, or an individual or position having overall responsibility for environmental matters for the company. (A duly authorized representative may thus be either a named individual or any individual occupying a named position); and iii.The written authorization is submitted to the Division. Responsible Person (Title): Currently Held By (Person): FirstName: LastName: Telephone: Email Address: Organization: Mailing Address: City: State: Zip Code: Same as 1) Permittee 4) *BILLING CONTACT if different than the permittee. 3) *SITE CONTACT local contact for questions relating to the facility & discharge authorized by this permit Responsible Person (Title): Currently Held By (Person): FirstName: LastName: Telephone: Email Address: Organization: Mailing Address: City: State: Zip Code: Same as 1) Permittee SW Construction Application for: page 2 of 5 B)PERMITTED PROJECT/FACILITY INFORMATION 5) OTHER CONTACT TYPES (check below) Add pages if necessary: LastName: Email Address: Responsible Person (Title): Currently Held By (Person): Telephone: Organization: Mailing Address: City: State: Zip Code: 001A Latitude Decimal Degrees Pretreatment Coordinator Environmental Contact Biosolids Responsible Party Other: Property Owner Inspection Facility Contact Consultant Compliance Contact Stormwater MS4 Responsible Person Stormwater Authorized Representative Project/Facility Name Street Address or Cross Streets (e.g., “S. of Park St. between 5th Ave. and 10th Ave.”, or “W. side of C.R. 21, 3.25 miles N. of Hwy 10”; A street name without an address, intersection, mile marker, or other identifying information describing the location of the project is not adequate. For linear projects, the route of the project should be described as best as possible with the location more accurately indicated by a map.) Facility Latitude/Longitude - (approximate center of site to nearest 15 seconds using one of the following formats) 001A Longitude . Degrees (to 3 decimal places) . Degrees (to 3 decimal places) (e.g., 39.703°, 104.933°) 001A Latitude 001A Longitude o Degrees ‘ Minutes Seconds “ o Degrees ‘ Minutes Seconds “ e.g., 39°46'11"N, 104°53'11"W Degrees, Minutes, Seconds OR For the approximate center point of the property, to the nearest 15 seconds. The latitude and longitude must be provided as either degrees, minutes, and seconds, or in decimal degrees with three decimal places. This information may be obtained from a variety of sources, including: Surveyors or engineers for the project should have, or be able to calculate, this information. EPA maintains a web-based siting tool as part of their Toxic Release Inventory program that uses interactive maps and aerial pho- tography to help users get latitude and longitude. The siting tool can be accessed at www.epa.gov/tri/report/siting_tool/index.htm U.S. Geological Survey topographical map(s), available at area map stores. Using a Global Positioning System (GPS) unit to obtain a direct reading. Note: the latitude/longitude required above is not the directional degrees, minutes, and seconds provided on a site legal description to define property boundaries. C)MAP (Attachment) If no map is submitted, the permit will not be issued Facility Information Map: Attach a map that indicates the site location and that CLEARLY shows the boundaries of the area that will be disturbed. Maps must be no larger than 11x17 inches. D)LEGAL DESCRIPTION Legal description: If subdivided, provide the legal description below, or indicate that it is not applicable (do not supply Township/Range/Section or metes and bounds description of site) Subdivision(s):Lot(s): Block(s) OR Not applicable (site has not been subdivided) SW Construction Application for: page 3 of 5 City:Zip Code:County: Total area of project site (Acres) Area of project site to undergo disturbance (Acres) Note: aside from clearing, grading and excavation activities, disturbed areas also include areas receiving overburden (e.g., stockpiles), demolition areas, and areas with heavy equipment/vehicle traffic and storage that disturb existing vegetative cover E)AREA OF CONSTRUCTION SITE Total disturbed area of Larger Common Plan of Development or Sale. If applicable: SW Construction Application for: page 4 of 5 Single Family Residential Development Other—Description: (i.e., total, including all phases, filings, lots, and infrastructure not covered by this application) Provide both the total area of the construction site, and the area that will undergo disturbance, in acres. Note: aside from clearing, grading and excavation activities, disturbed areas also include areas receiving overburden (e.g., stockpiles), demolition areas, and areas with heavy equipment/vehicle traffic and storage that disturb existing vegetative cover (see construction activity description under the APPLICABILITY section on page 1). If the project is part of a larger common plan of development or sale (see the definition under the APPLICABILITY section on page 1), the disturbed area of the total plan must also be included. F)NATURE OF CONSTRUCTION ACTIVITY Check the appropriate box(s) or provide a brief description that indicates the general nature of the construction activities. (The full description of activities must be included in the Stormwater Management Plan.) Multi-Family Residential Development Commercial Development Oil and Gas Production and/or Exploration (including pad sites and associated infrastructure) Highway/Road Development (not including roadways associated with commercial or residential development) G)ANTICIPATED CONSTRUCTION SCHEDULE Final Stabilization Date: Construction Start Date: Construction Start Date - This is the day you expect to begin ground disturbing activities, including grubbing, stockpiling, excavating, demolition, and grading activities. Final Stabilization Date - in terms of permit coverage, this is when the site is finally stabilized. This means that all ground surface disturbing activities at the site have been completed, and all disturbed areas have been either built on, paved, or a uniform vegetative cover has been established with an individual plant density of at least 70 percent of pre-disturbance levels. Permit coverage must be maintained until the site is finally stabilized. Even if you are only doing one part of the project, the estimated final stabilization date must be for the overall project. If permit coverage is still required once your part is completed, the permit certification may be transferred or reassigned to a new responsible entity(s). H)RECEIVING WATERS (If discharge is to a ditch or storm sewer, include the name of the ultimate receiving waters) Immediate Receiving Water(s): Ultimate Receiving Water(s): Identify the receiving water of the stormwater from your site. Receiving waters are any waters of the State of Colorado. This includes all water courses, even if they are usually dry. If stormwater from the construction site enters a ditch or storm sewer system, identify that system and indicate the ultimate receiving water for the ditch or storm sewer. Note: a stormwater discharge permit does not allow a discharge into a ditch or storm sewer system without the approval of the owner/ operator of that system. I)SIGNATURE PAGE STORMWATER MANAGEMENT PLAN CERTIFICATION Ink Signature Electronic Signature 1.You may print and sign this document and mail the hard copy to the State along with required documents. OR 2.Electronic Submission Signature You may choose to submit your application electronically, along with required attachments. To do so, click the SUBMIT button below which will direct you, via e-mail , to sign the document electronically using the DocuSign Electronic Signature process. Once complete, you will receive, again via e-mail, an electronically stamped Adobe pdf of this application. Print the signature page from the electronically stamped pdf, sign it and mail it to the WQCD Permits Section to complete the application process (address is on page 1 of the application).  The Division encourages use of the electronic submission of the application and electronic signature. This method meets signature requirements as required by the State of Colorado.  The ink signed copy of the electronically stamped pdf signature page is also required. This requirement meets Federal EPA Requirements. Processing of the application will begin with the receipt of the valid electronic signature. “I certify under penalty of law that a complete Stormwater Management Plan, as described in Appendix B of this application, has been prepared for my activity. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the Stormwater Management Plan is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for falsely certifying the completion of said SWMP, including the possibility of fine and imprisonment for knowing violations." Date: Signature of Legally Responsible Person or Authorized Agent (submission must include original signature) Name (printed) Title "I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is to the best of my knowledge and belief, true, accurate and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations." “I understand that submittal of this application is for coverage under the State of Colorado General Permit for Stormwater Discharges Associated with Construction Activity for the entirety of the construction site/project described and applied for, until such time as the application is amended or the certification is transferred, inactivated, or expired.” [Reg 61.4(1)(h)] DO NOT INCLUDE A COPY OF THE STORMWATER MANAGEMENT PLAN DO NOT INCLUDE PAYMENT—AN INVOICE WILL BE SENT AFTER THE CERTIFICATION IS ISSUED. This form must be signed by the Permittee to be considered complete. Per Regulation 61 In all cases, it shall be signed as follows: a) In the case of corporations, by a responsible corporate officer. For the purposes of this section, the responsible corporate officer is responsible for the over all operation of the facility from which the discharge described in the application originates. b) In the case of a partnership, by a general partner. c) In the case of a sole proprietorship, by the proprietor. d) In the case of a municipal, state, or other public facility, by either a principal executive officer or ranking elected official SW Construction Application for: page 5 of 5 3rd Party Preparer: If this form was prepared by an authorized agent on behalf of the Permittee, please complete the fields below. Preparer Name (printed) Email Address For Docusign Appendix G - Sample Inspection Log Appendix H – Floodplain Permit Appendix I – GroundWater Information TH-1 TH-2 TH-4 TH-7 TH-8 TH-6 TH-5 TH-3 Mulberry Road 11 10 9 8 6 7 MULBERRY RD. VINE DR.I - 25CR 9ESITE LEGEND: INDICATES APPROXIMATE LOCATION OF EXPLORATORY BORING INDICATES DEPTH-TO-GROUNDWATER (FEET) TH-1 7 HARTFORD HOMES SPRINGER-FISCHER PROPERTY CTL I T PROJECT NO. FC07733-115 FIGURE 4 Depth-to-Groundwater Countour Map VICINITY MAP (FORT COLLINS, COLORADO) NOT TO SCALE 500' APPROXIMATE SCALE: 1" = 500' Appendix J – Site Map and Design Drawings Erosion Control Plans - - - - - - - - - - - - - - STAMP H:\Hartford Homes\CO Fort Collins HFH22 - Mulberry\0CIV\3-CD\Offsite water\HFH022_OFW_C4.0_Erosion control.dwg - Matthew Kasch - 1/16/2023Init.#Issue / DescriptionDateDEVELOPMENT CONSTRUCTION PLANSBLOOM OFFSITE WATERFORT COLLINS, COTHESE PLANS ARE AN INSTRUMENT OF SERVICE AND ARE THE PROPERTY OF GALLOWAY, AND MAY NOT BE DUPLICATED, DISCLOSED, OR REPRODUCED WITHOUT THE WRITTEN CONSENT OF GALLOWAY. COPYRIGHTS AND INFRINGEMENTS WILL BE ENFORCED AND PROSECUTED. COPYRIGHT GallowayUS.com 5265 Ronald Reagan Blvd., Suite 210 Johnstown, CO 80534 970.800.3300 PRELIMINARYNOT FOR BIDDINGNOT FOR CONSTRUCTIONDate: Drawn By: Project No: Checked By: 01.16.2023 HFH000022 MCK JEP EROSION CONTROL PLAN C4.0 KEYMAP Know what's before you dig. - - - - - - - - - - - - - - STAMP H:\Hartford Homes\CO Fort Collins HFH22 - Mulberry\0CIV\3-CD\Offsite water\HFH022_OFW_C4.0_Erosion control.dwg - Matthew Kasch - 1/16/2023Init.#Issue / DescriptionDateDEVELOPMENT CONSTRUCTION PLANSBLOOM OFFSITE WATERFORT COLLINS, COTHESE PLANS ARE AN INSTRUMENT OF SERVICE AND ARE THE PROPERTY OF GALLOWAY, AND MAY NOT BE DUPLICATED, DISCLOSED, OR REPRODUCED WITHOUT THE WRITTEN CONSENT OF GALLOWAY. COPYRIGHTS AND INFRINGEMENTS WILL BE ENFORCED AND PROSECUTED. COPYRIGHT GallowayUS.com 5265 Ronald Reagan Blvd., Suite 210 Johnstown, CO 80534 970.800.3300 PRELIMINARYNOT FOR BIDDINGNOT FOR CONSTRUCTIONDate: Drawn By: Project No: Checked By: 01.16.2023 HFH000022 MCK JEP EROSION CONTROL PLAN C4.1 KEYMAP Know what's before you dig. Know what's before you dig. MCK JEP EROSION CONTROL DETAILS C4.2 - - - - - - - - - - - - - - STAMP H:\Hartford Homes\CO Fort Collins HFH22 - Mulberry\0CIV\3-CD\Offsite water\HFH022_OFW_4.2_EC_Details.dwg - Matthew Kasch - 1/16/2023Init.#Issue / DescriptionDateDEVELOPMENT CONSTRUCTION PLANSBLOOM OFFSITE WATERFORT COLLINS, COTHESE PLANS ARE AN INSTRUMENT OF SERVICE AND ARE THE PROPERTY OF GALLOWAY, AND MAY NOT BE DUPLICATED, DISCLOSED, OR REPRODUCED WITHOUT THE WRITTEN CONSENT OF GALLOWAY. COPYRIGHTS AND INFRINGEMENTS WILL BE ENFORCED AND PROSECUTED. COPYRIGHT GallowayUS.com 5265 Ronald Reagan Blvd., Suite 210 Johnstown, CO 80534 970.800.3300 PRELIMINARYNOT FOR BIDDINGNOT FOR CONSTRUCTIONDate: Drawn By: Project No: Checked By: 01.16.2023 HFH000022