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SWPPP www.pca.state.mn.us • 651-296-6300 • 800-657-3864 • TTY 651-282-5332 or 800-657-3864 • Available in alternative formats wq-strm2-12 • 4/13/09 Page 1 of 9 Attachment A: Construction SWPPP Template Stormwater Pollution Prevention Plan (SWPPP) Template To comply with the General Stormwater Permit for Construction Activity Doc Type: Stormwater Pollution Prevention Plan Important: Before completing this SWPPP, you must read and understand the requirements in the General Stormwater Permit for Construction Activity (MN R100001) available from Minnesota Pollution Control Agency (MPCA) Web site at http://www.pca.state.mn.us/water/stormwater/index.html. An overview of the permit is available from MPCA at http://www.pca.state.mn.us/publications/wq-strm2-05.pdf. This Construction SWPPP Template will help you complete information required in Parts III and IV of the permit. Construction Activity Information Project name: Vista at Bentz Farms Project location (Briefly describe where construction activity occurs. Include address if available.) Address or describe area: PID# 250101800 City or Township: City of Chanhassen State: MN Zip code: 55317 Latitude/longitude of approximate centroid of project: Method of collection of latitude/longitude: GPS Online tool USGS Topographic map Scale used: All cities where construction will occur: Chanhassen All counties where construction will occur: Carver All townships where construction will occur: Project size (number of acres to be disturbed): 14.3 Project type: Residential Commercial/Industrial Road construction Residential and road construction Other (describe): Cumulative impervious surface: Existing area of impervious surface: 1.75 acres (to the nearest quarter acre) Post construction area of impervious surface: 4.0 acres (to the nearest quarter acre) Receiving waters Water body ID* Name of water body Type (ditch, pond, wetland, lake, stream, river) Special water? (See Stormwater Permit Appendix A) Impaired Water?** (See Stormwater Permit Appendix A) Bluff Creek Stream Yes No Yes No Wetland Wetland Yes No Yes No Yes No Yes No Yes No Yes No * Water Body identification (ID) might not be available for all water bodies. Use the Special and Impaired Waters Search Tool at: www.pca.state.mn.us/water/stormwater/stormwater-c.html. ** Impaired water for the following pollutant(s) or stressor(s): phosphorus, turbidity, dissolved oxygen, or biotic impairment. Dates of construction (Briefly describe where construction activity occurs. Include address if available.) Construction start date: 09/14/14 Estimated completion date: 11/30/15 www.pca.state.mn.us • 651-296-6300 • 800-657-3864 • TTY 651-282-5332 or 800-657-3864 • Available in alternative formats wq-strm2-12 • 4/13/09 Page 2 of 9 Contact Information Owner of the site Business or firm name: Homestead Partners, LLC. Owner name: Jason Biederwolf Title: Project Manager Mailing address: 525 15th Avenue South City: Hopkins State: MN Zip code: 55343 E-mail address: jasonb@homestead-partners.com Telephone: (612) 272-9701 Contact name: (See Above) Title: Mailing address: City: State: Zip code: E-mail address: Telephone: Contractor (Person who will oversee implementation of the SWPPP) Business or firm name: (See “Owner of the Site” info above) Owner name: Title: Mailing address: City: State: Zip code: E-mail address: Telephone: Contact name: Title: Mailing address: City: State: Zip code: E-mail address: Telephone: Party responsible for long-term operation and maintenance of the permanent Stormwater Management System Business or firm name: (See “Owner of the Site” info above) Owner name: Title: Mailing address: City: State: Zip code: E-mail address: Telephone: Contact name: Title: Mailing address: City: State: Zip code: E-mail address: Telephone: General Construction Project Information Describe the construction activity (what will be built, general timeline, etc): · This +/- 14.3 acre development will consist of the land development of fifteen (15) single family homes, two public streets and one private street. Other soil disturbing activities will include the home building, driveway construction and lot landscaping. This project will be graded and constructed in 1 phase. · Soil disturbing activities will include: Demolition of the existing structures, installation of a rock entrance berm, clearing and grubbing, the installation of silt fence and tree fence prior to grading, the installation of silt fence around the proposed ponds area after the grading is complete, grading, re-spreading topsoil, and grading restoration which will consist of seeding and mulching all disturbed areas outside of the street row. Erosion blanket will also be installed on all 3:1 slopes www.pca.state.mn.us • 651-296-6300 • 800-657-3864 • TTY 651-282-5332 or 800-657-3864 • Available in alternative formats wq-strm2-12 • 4/13/09 Page 3 of 9 or greater. Additional erosion blanket may be used throughout the site. See the Erosion & Sediment Control Plan for specific locations. · After grading is completed site development will continue with the installation of the utilities (sanitary sewer, watermain, storm sewer) and the street construction, most likely during the fall of 2014 and spring of 2015. Describe soil types found at the project: According to the Natural Resource Conservation Service, Hamel loam, Klklenny-Lester loam, Glencoe loam, and Houghton & Muskego soils are predominantly found on-site. There is a significant amount of top soil throughout the site. General Site Information (III.A) 1. Describe the location and type of all temporary and permanent erosion prevention and sediment control Best Management Practices (BMPs). Include the timing for installation and procedures used to establish additional temporary BMPs as necessary. (III.A.4.a) See “Final Erosion Control plan” for details pertaining to temporary and permanent BMPs. Prior to Grading: Silt and tree fence to locate grading limits and provide down gradient sediment control. Rock entrance berm. Grading:. Erosion blanket will be utilized on all 3:1 slopes. Biorolls will be used in rear yard swales. MnDot seed mix #250 will be spread at a rate of 100 lbs./acre and fertilize with 20-0-10 at 100 lbs./acre. Only phosphorus free fertilizer shall be used. Utility & Street: Inlet protection on all storm sewer catchbasins. Weekly street sweeping to prevent off-site vehicle tracking. Permanent BMPs: NURP Pond & Filtration Trench to meet or exceed quality and rate control requirements. Skimmer Outlet Structure to prevent floatables from leaving site. Rip-rap to provide provide energy dissipation and prevent erosion. 2. Attach to this SWPPP a table with the anticipated quantities for the life of the project for all erosion prevention and sediment control BMPs (III. A. 4.b) 3. Attach to this SWPPP a site map that includes the following features (III.A.3.b – f): · Existing and final grades, including dividing lines and direction of flow for all pre and post-construction stormwater runoff drainage areas located within the project limits. · Locations of impervious surfaces and soil types. · Locations of areas not to be disturbed. · Location of areas of phased construction · All surface waters and existing wetlands within one mile from the project boundaries that will receive stormwater runoff from the site (identifiable on maps such as USGS 7.5 minute quadrangle maps or equivalent). Where surface waters receiving runoff associated with construction activity will not fit on the plan sheet, they must be identified with an arrow, indicating both direction and distance to the surface water. Methods to be used for final stabilization of all exposed soil areas. 4. Were stormwater mitigation measures required as the result of an environmental, archaeological, or other required local, state, or federal review of the project? Yes No If yes, describe how these measures were addressed in the SWPPP. (III.A.6.) 5. Is the project located in a karst area such that additional measures would be necessary to protect drinking water supply management areas as described in Minn. R. chapters 7050 and 7060? Yes No If yes, describe the additional measures to be used. (III.A.7.) 6. Does the site discharge to a calcareous fen listed in Minn. R. 7050.0180, subp. 6.b.? Yes No If yes, a letter of approval from the Minnesota Department of Natural Resources must be obtained prior to application for this permit. (Part I B.6 and Part III.A.8) 7. Does the site discharge to a water that is listed as impaired for the following pollutant(s) or stressor(s): phosphorus, turbidity, dissolved oxygen or biotic impairment? Use the Special and Impaired Waters Search Tool at: www.pca.state.mn.us/water/stormwater/stormwater-c.html. Yes No If no, skip to Training. Does the impaired water have an approved Total Maximum Daily Loads (TMDL) with an Approved Waste Load Allocation for construction activity? Yes No www.pca.state.mn.us • 651-296-6300 • 800-657-3864 • TTY 651-282-5332 or 800-657-3864 • Available in alternative formats wq-strm2-12 • 4/13/09 Page 4 of 9 If yes: a. List the receiving water, the areas of the site discharging to it, and the pollutant(s) identified in the TMDL. b. List the BMPs and any other specific construction stormwater related implementation activities identified in the TMDL. If the site has a discharge point within one mile of the impaired water and the water flows to the impaired water but no specific BMPs for construction are identified in the TMDL, the additional BMPs in Appendix A (C.1 and C.2) must be added to the SWPPP and implemented. (III.A.7). The additional BMPs only apply to those portions of the project that drain to one of the identified discharge points. Training (III.A) Training is required for all permitted projects after February 1, 2010. It must be provided by entities with expertise in erosion prevention, sediment control or permanent stormwater management. Training must be focused on the individual’s job duties as they relate to the permit requirements (Part III.A.2). Who must be trained? Individual(s) preparing the SWPPP for the project Individual(s) overseeing the implementation of, revising and amending the SWPPP and individuals performing inspections required by the permit Individuals performing or supervising the installation, maintenance or repair of BMPs Attach to this SWPPP: Names of the personnel trained; dates of training; name of instructor(s) and entity providing training; content of training course or workshop (including number of hours of training) Selection of a Permanent Stormwater Management System (III.C) 1. Will the project create a new cumulative impervious surface greater than or equal to one acre? Yes No If yes, a water quality volume of one-half inch of runoff from this area must be treated before leaving the site or entering surface waters (one inch if discharging to special waters). 2. Describe which method will be used to treat runoff from the new impervious surfaces created by the project (III.C): · Wet sedimentation basin – NURP Ponds · Infiltration/Filtration – Filtration Trench · Combination of practices – Include all calculations and design information for the method selected. See Part III.C of the permit for specific requirements associated with each method. Pond 1 – This area will be the primary treatment for quality and rate control. Stormwater 100 Yr. Routing Summary Sheet • NWL – 956.0 • HWL – 958.5 • Q-routed Pond (100) = 23.87 cfs • Outlet Structure 24” RCP Inlet controlled • TSS Removal Efficiencies = 95.3% • TP Removal Efficiencies = 80.7% Pond 2 – • NWL – 958.0 • HWL – 959.2 • Q-routed Pond (100) = 6.01 cfs • Outlet Structure 15” RCP Inlet controlled • TSS Removal Efficiencies = 98.7% • TP Removal Efficiencies = 90.8% www.pca.state.mn.us • 651-296-6300 • 800-657-3864 • TTY 651-282-5332 or 800-657-3864 • Available in alternative formats wq-strm2-12 • 4/13/09 Page 5 of 9 3. If it is not feasible to meet the treatment requirement for the water quality volume, describe why. This can include proximity to bedrock or road projects where the lack of right of way precludes the installation of any permanent stormwater management practices. Describe what other treatment, such as grasses swales, smaller ponds, or grit chambers, will be implemented to treat runoff prior to discharge to surface waters. (III.C) 4. If proposing an alternative method to treat runoff from the new impervious surfaces, describe how this alternative will achieve approximately 80 percent removal of total suspended solids on an annual average basis (III.C.5). Note: If proposing an alternative method, you must submit your SWPPP to MPCA at least 90 days prior to the starting date of the construction activity. Erosion Prevention Practices (IV.B) 1. Describe construction phasing, vegetative buffer strips, horizontal slope grading, and other construction practices to minimize erosion. Delineate areas not to be disturbed (e.g., with flags, stakes, signs, silt fence, etc.) before work begins. Phasing - This site will be graded in one phase. Slopes - Slope grades are not to exceed 3:1. Delineation of Areas- Silt fence and tree fence points will be staked prior to any tree clearing or grading operations. No grading is to be done outside the clearing and grading limits as delineated by the silt and tree fence. 2. Describe temporary erosion protection or permanent cover used for exposed soil. All exposed soil areas must be stabilized as soon as possible but in no case later than 14 days after the construction activity in that portion of the site has temporarily or permanently (part IV.B.2). THIS SITE DRAINS TO AN IMPAIRED WATER BODY- According to the MPCA under in Appendix A (C.1 and C.2) “All projects with a discharge point within 1 mile of an impaired water must incorporate the additional best management practices (BMPs) C.1 & C.2 found in Appendix A of the permit for all portions of the project that drain to the discharge point: C.1 During construction. a. All exposed soil areas must be stabilized as soon as possible to limit soil erosion but in no case later than seven (7) days after the construction activity in that portion of the site has temporarily or permanently ceased. b. Temporary sediment basin requirements described in Part III.B.1-5 must be used for common drainage locations that serve an area with five (5) or more acres disturbed at one time. C.2. Post construction. The water quality volume that must be treated by the project’s permanent stormwater management system described in Part III.C. shall be one (1) inch of runoff from the new impervious surfaces created by the project. Where site conditions allow, at least ½ inch of the water quality volume must be infiltrated. See Part III.C.2 for more information on infiltration design and appropriate site conditions. If it is determined that site conditions are not appropriate for infiltration (e.g. lack of 3 ft. of separation to seasonally saturated ground water, proximity to bedrock, contaminated soils) the reasons should be documented in the Stormwater Pollution Prevention Plan (SWPPP) for the project. Infiltration is not required in Hydrologic Soil Group D soils. Erosion Blanket - This blanket will be installed as indicated on the erosion and sediment control plan. It will provide slope protection until the turf is established. For retaining wall construction the grading contractor will install Erosion blanket on the temporary 1:1 slopes until the wall construction can be completed. Bio-rolls – Bio-rolls will be installed in swale areas to help slow runoff and minimize erosion. Seeding Restoration - Temporary/Permanent Stabilization (Seeding and Mulching) – Temporary seeding and mulch must be placed on all disturbed soil within 14 days, unless actively being worked on. All disturbed areas will be restored with 4” to 6” of topsoil. The restoration shall begin within 72 hours of the grading completion. The seed mix shall be MNDot Mix No. 250 applied at a rate of 100 lbs/acre and fertilized with 20-0-10 at a rate of 100 lbs. per acre. The mulch shall be Type 1 and applied at a rate of 2 tons per acre, disc anchored (with disc blades set nearly straight) immediately after placement. www.pca.state.mn.us • 651-296-6300 • 800-657-3864 • TTY 651-282-5332 or 800-657-3864 • Available in alternative formats wq-strm2-12 • 4/13/09 Page 6 of 9 Sodding – Two types of sodding will be done with this project. The first will be for erosion control protection for the streets, after the installation of the curb and the minor utilities the contractor will install two rows of sod behind the curb for a temporary erosion protection. The second type of sod will be for the yards once the house construction is complete. 3. For drainage or diversion ditches, describe practices to stabilize the normal wetted perimeter within 200 lineal feet of the property edge or point of discharge to surface water. The remaining portions of the temporary or permanent ditch or swale must be stabilized within 14 days after connecting to surface waters and construction in that portion of the ditch has temporarily or permanently ceased. 4. Describe other erosion prevention practices (list and describe). Sediment Control Practices (IV.C) Describe sediment control practices used to minimize sediments from entering surface waters, including curb and gutter systems and storm drain inlets. At a minimum, these sediment control practices must include: · Sediment controls for temporary or permanent drainage ditches and sediment basins that are designed as part of a treatment system · Installation of check dams or other grade control practice to ensure sheet flow and prevent rills (for slope lengths greater than 75 feet with a grade of 3:1 or steeper). · Sediment control practices on all down gradient perimeters prior to land disturbing activities. · Storm drain inlet protection for all inlets. · Silt fencing or other sediment control surrounding temporary soil stockpiles. · Minimize vehicle tracking of sediments (e.g., stone pads, concrete or steel wash racks, or equivalent systems). · Street sweeping of tracked sediment. · Temporary sedimentation basins (see Part III.B). Silt Fence – Silt fences are designed as a temporary sediment barrier consisting of a filter fabric attached to support posts. This site has three applications for silt fence. These applications are as follow: 1. the installation of silt fence along the grading limits to protect the wetlands from sediment during the grading and utility construction process, 2. the installation of silt fence around the created ponds and rain gardens after construction to control the sediment runoff until the turf is established and the development is completed, 3. the installation of silt fence surrounding temporary stockpiles. Temporary Rock Construction Entrance – A rock entrance berm is constructed of coarse clean rock installed at the proposed entrance point for all construction vehicles. A detail of the rock entrance berm is shown on the final grading plan. This stone pad provides a tire cleaning mechanism for all vehicles leaving the site. There is one entrance for this project. Please see the Erosion & Sediment Control Plan for location of rock entrance berm. Storm Drain Inlet Protection - Storm drain inlet protection is a sediment barrier placed around a storm sewer inlet. This structure traps sediment before it enters the storm sewer system. The utility contractor will be required to install inlet protection per the City of Chanhassen’s details. Storm Sewer System – This storm sewer system will consist of concrete pipe. These pipes provide a means of intercepting and transporting stormwater runoff to the treatment areas. NURP Ponds and Infiltration/filtration areas– A permanent Filtration area is proposed for this project. This area will be constructed around the maintenance bench of the ponds. This area will be completed once heavy construction traffic in their area has subsided. A detailed typical cross-section can be found in the construction plans on the storm sewer sheet. Since this is a permanent treatment area, we are installing silt fence around the pond hwl after construction to provide better protection against erosion. Sediment may need to be removed from the pond prior to final acceptance. Outlet Structures and Outlet Protection – There are wetlands located within & adjacent to this project, as a result outlet structures are proposed to transfer water from the storm water treatment pond to the wetland after treatment. These structures will serve to provide skimming and rate control. Rip-rap will be placed at the base of all aprons to provide erosion protection by protecting the downstream soils from turbulence and high discharge velocities Temporary Sediment Basins – Temporary sediment basins with rip-rap overflows are required for common drainage locations to keep sediment from leaving the project boundaries. Sediment basins shall be inspected and maintained to ensure proper sediment capture. Check Dams – Installation of check dams or other grade control practice to ensure sheet flow and prevent rills (for slope lengths greater than 75 feet with a grade of 3:1 or steeper). www.pca.state.mn.us • 651-296-6300 • 800-657-3864 • TTY 651-282-5332 or 800-657-3864 • Available in alternative formats wq-strm2-12 • 4/13/09 Page 7 of 9 Bio-rolls - Sediment controls for temporary or permanent drainage ditches and sediment basins that are designed as part of a treatment system. Bio-rolls shall be spaced according to the Erosion and Sediment Control Plan. Dewatering and Basin Draining (IV.D) 1. Will the project include dewatering or basin draining? Yes No 2. If yes, describe BMPs used so the discharge does not adversely affect the receiving water or downstream landowners. Additional BMPs for Special Waters and Discharges to Wetlands (Appendix A, Parts C and D) 1. Special Waters. Does your project discharge to special waters? Yes No 2. If proximity to bedrock or road projects where the lack of right of way precludes the installation of any of the permanent stormwater management practices, then other treatment such as grassed swales, smaller ponds, or grit chambers is required prior to discharge to surface waters. Describe what other treatment will be provided. 3. Describe erosion and sediment controls for exposed soil areas with a continuous positive slope to a special waters, and temporary sediment basins for areas that drain five or more acres disturbed at one time. Silt fence will be installed around the perimeter of the project, including at the bottom of the slopes. Silt fence will be inspected regularly to insure that it is functioning properly. The pond will be graded early in the project to provide temporary sediment control. After the project is completed the pond shall be cleaned for permanent stormwater control. 4. Describe the undisturbed buffer zone to be used (not less than 100 linear feet from the special water). 5. Describe how the permanent stormwater management system will ensure that the pre and post project runoff rate and volume from the 1, and 2-year 24-hour precipitation events remains the same. Use of infiltration basins as well as storm ponds with outlet structures will hold the 1 and 2 year events. For two year events the runoff rate and volume are both reduced from the existing condition. 6. Describe how the permanent stormwater management system will minimize any increase in the temperature of trout stream receiving waters resulting in the 1, and 2-year 24-hour precipitation events. N/A 7. Wetlands. Does your project discharge stormwater with the potential for significant adverse impacts to a wetland (e.g., conversion of a natural wetland to a stormwater pond)? Yes No If Yes, describe the wetland mitigation sequence that will be followed in accordance with Part D of Appendix A. Inspections and Maintenance (IV.E) Describe procedures to routinely inspect the construction site: · Once every seven (7) days during active construction and, · Within 24 hours after a rainfall event greater than 0.5 inches in 24 hours, and within seven (7) days after that. Inspections must include stabilized areas, erosion prevention and sediment control BMPs, and infiltration areas. • The silt fence will be installed prior to any site grading. • Only about one half of the site will be exposed at any given time. The grading contractor will be finishing lots as the cuts and fills are achieved in accordance with the approved grading plan. • All erosion control measures will be inspected every week and following any storm event greater than 0.5” in a 24 hour period. • All erosion control measures will be maintained in good working order, maintenance and repairs will be initiated within a 24 hour period of the report. Monitoring of all repairs will be done. • Built up sediment will be removed from all silt fence when it has reached one-half of the fence height. www.pca.state.mn.us • 651-296-6300 • 800-657-3864 • TTY 651-282-5332 or 800-657-3864 • Available in alternative formats wq-strm2-12 • 4/13/09 Page 8 of 9 • Silt fence will be inspected for depth of sediment, tears, and to see if the fabric is securely attached to the fence posts, and to see if the fence posts are firmly in the ground. • The pond and infiltration/filtration area will be monitored for depth of sediment, and the build up of sediment will be removed at the end of the project, if necessary. • The embankment around the ponds and infiltration/filtration areas will be inspected for any breaches or erosion scars, over compaction and any repairs needed, will be promptly made. • The seeding and mulching will be inspected for any bare spots, washouts, and for healthy growth. • A maintenance/inspection report will be made after each inspection. A copy of the report will be sent to the City of Chanhassen. • Mr. Jason Biederwolf will select individuals who will be responsible for the inspections, maintenance, and repair activities, and for filling out the inspection and maintenance reports. Non-Storm Water Discharges: It is expected that the following non-stormwater discharges will occur from the site during the construction period- • Water from the water wagon for dust control, if needed. • Water from the flushing of the watermain lines. • Water from the street sweepers. • Uncontaminated groundwater for any needed dewatering excavations, if required. All non-storm water discharges will be directed to stormwater treatment ponds prior to discharge. Pollution Prevention Management Measures (IV.F) 1. Describe practices to properly manage and dispose of solid waste, including trash (IV.F.1): Solid Waste – All trash and construction debris from the site will be collected and deposited in a dumpster. A dumpster will be required for each new home constructed. The dumpsters shall be emptied as necessary. No construction materials shall be buried on site. All solid waste must be disposed of in accordance with the MPCA disposal requirements (Part IV.F.1) 2. Described practices to properly manage hazardous materials (IV.F.2): · All hazardous materials like oil, gasoline and paint must be properly stored. To prevent spills and leaks, secondary containment is necessary for hazardous materials. · A leak proof containment facility shall be used for fuel storage tanks to prevent any leakage from infiltrating the ground. · An effort will be made to store only enough products to do the required job. · All materials stored on site will be stored in a neat and orderly manner. · All products will be kept in their original container, with the original labels still attached, unless they are not re- sealable. · Substances will not be mixed with one another unless recommended by the manufacturer. · Whenever possible all of a product will be used up before disposing of a container. · Manufacturers’ recommendations for proper disposal will be followed. · The site superintendent will routinely inspect the site to ensure proper disposal of all on site materials. 3. Describe practices for external washing of trucks and other construction vehicles (IV.F.3): · A defined and limited area of the site shall be used for external washing of construction vehicles. Washing runoff shall be contained and disposed of in accordance with MPCA. No engine degreasing allowed on-site. 4. Describe how are you going to provide a safe, leak proof, concrete washout on site (IV.F.4): · A leak proof containment facility shall be used for all liquid and solid wastes generated by concrete washout operations. Liquid and solid wastes shall not come in contact with the ground and must be disposed of in accordance with the MPCA. 5. Describe your spill prevention plan: • Fertilizers • Petroleum Based Products • Cleaning Solvents • Detergents • Adhesive Solvents • Wood • Masonry Block • Concrete • Roofing shingles • Caulking • Metal Studs www.pca.state.mn.us • 651-296-6300 • 800-657-3864 • TTY 651-282-5332 or 800-657-3864 • Available in alternative formats wq-strm2-12 • 4/13/09 Page 9 of 9 • Paints/Stains • Chlorine • Asphalt Tack • Bituminous Paving Products Product Specific Practices – Petroleum Products: All onsite vehicles and equipment will be monitored for leaks and receive regular preventative maintenance to reduce the chance of leakage. Petroleum products will be stored in a tightly sealed container, which is clearly labeled. Any asphalt substances used onsite will be applied according to the manufacturer’s recommendations. Fertilizers: Fertilizers will be applied only in the minimum amounts as recommended by the manufacturer. Once applied, the fertilizer will be worked into the soil to limit the exposure to stormwater. Paints: All containers will be tightly sealed and stored when not required for use. Excess paint will not be discharged into the storm sewer system, but will be properly disposed of in accordance with local regulations. Concrete Trucks: Will only be allowed to wash out in designated discharge areas. Spill Control Practices – • All spills will be cleaned up immediately after discovery, in accordance with the manufacturer’s recommended methods. • The spill area will be kept well ventilated. • Spills of toxic or hazardous materials must be reported to the Minnesota Duty Officer 1-800-422-0798. • A log of the spill type, location, date, and time will be created by the job superintendent. The spill prevention plan will be adjusted to include measures to prevent this type of spill from reoccurring. 6. Describe measures to address sanitary and septic waste: · Portable on-site sanitary and septic waste shall adequately be provided and maintained throughout the duration of the project. · All sanitary sewer waste will be collected from the portable units as required by local regulations. Records Retention (III.D) Describe your record retention procedures (must be kept at the site) (III.D). Records must include: · Copy of SWPPP and any changes · Training documentation (III.A.2.) · Inspection and maintenance records · Permanent operation and maintenance agreements · Calculations for the design of temporary and permanent stormwater management systems Final Stabilization (IV.G) Describe how you will achieve final stabilization of the site (IV.G). · Upon final grading of any given portion of the site, final stabilization must be implemented within 14 days of completion. · Final stabilization includes but is not limited to: seed & mulch as described above, Erosion blanket, bio-rolls, sod, and after grading silt fence. All perimeter and down gradient silt fence shall be inspected and repaired as necessary.