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Design Steps for Construction types-and-programs/stormwater/construction- stormwater/stormwater-steps-to-

Apr 01, 2015



  • Slide 1

Design Steps for Construction types-and-programs/stormwater/construction- stormwater/stormwater-steps-to-construction.html Adapted from the MPCA Website Dwayne Stenlund, CPESC #2052 MNDOT/OES Slide 2 SWPPP Definition Storm Water Pollution Prevention Plan (SWPPP) means a plan for stormwater discharge that includes all required content under Part III of this Permit and which describes the erosion prevention BMPs, sediment control BMPs and Permanent Stormwater Management Systems that, when implemented, will decrease soil erosion on a parcel of land and decrease offsite nonpoint pollution. Slide 3 BMP Definition Best Management Practices (BMPs) means the most effective and practicable means of erosion prevention and sediment control, and water quality management practices that are the most effective and practicable means of to control, prevent, and minimize degradation of surface water, including avoidance of impacts, constructionphasing, minimizing the length of time soil areas are exposed, prohibitions, pollution prevention through good housekeeping, and other management practices published by state or designated areawide planning agencies. Slide 4 Infeasible Definition Infeasible means not technologically possible or not economically practicable and achievable in light of the best industry practices. Slide 5 Treatment Volume Definition Water Quality Volume means one (1) inch of runoff from the new impervious surfaces created by this project (calculated as an instantaneous volume) and is the volume of water to be treated in the Permanent Stormwater Management System, as required by this permit. Slide 6 Erosion Prevention Erosion Prevention means measures employed to prevent erosion. Examples include but not limited to: soil stabilization practices, limited grading, mulch, temporary erosion protection or permanent cover, and construction phasing. Slide 7 Steep Slopes Definition Steep Slopes means slopes that are 1:3 (V:H) (33.3 percent) or steeper in grade. Slide 8 Ditch Stabilization Definition The Permittee(s) must stabilize the normal wetted perimeter of any temporary or permanent drainage ditch or swale that drains water from any portion of the construction site, or diverts water around the site, within 200 lineal feet from the property edge, or from the point of discharge into any surface water. Stabilization of the last 200 lineal feet must be completed within 24 hours after connecting to a surface water or property edge. Designing for (Applying) mulch, hydromulch, tackifier, polyacrylamide or similar erosion prevention practices is not acceptable stabilization in any part of a temporary or permanent drainage ditch or swale. Normal Wetted Perimeter means the area of a conveyance, such as a ditch, channel, or pipe that is in contact with water during flow events that are expected to occur from a twoyear 24hour storm event. Slide 9 Buffer Definition Natural Buffer means an area of undisturbed cover surrounding surface waters within which construction activities are restricted. Natural buffer includes the vegetation, exposed rock, or barren ground that exists prior to commencement of earthdisturbing activities. Slide 10 Steps to Construction Step 1. Identify the site Step 2. Permits needed Step 3. Environmental review Step 4. Permit requirements Step 5. Special waters Step 6. Protected waters Step 7. SWPPP Step 8. Discharges Step 9. Eligibility Step 10. Application form Step 11. Application deadlines Step 12. Construction Slide 11 Step 1. Identify the construction site boundaries, the latitude and longitude for the centroid of the site, and the major phases of the project. Proposed construction site boundaries (lat/long, GPS) Identify phasing opportunities for vegetation retention, vegetation establishment sequence Minimize or eliminate negative impacts by time of year, speed Slide 12 Step 2. Determine if additional permits are needed USACE DNR Tribal Watershed district City/county Other Water appropriations Slide 13 Step 3. Determine if Environmental Review is needed MN. Rules Chapter 4410 Understand and design to deliver the commitments made Eagles, fish, cultural/historic, rare, endangered, threatened plants/animals Viewsheds Air quality Etc. Slide 14 Step 4. Understand the requirements of the NPDES/SDS general stormwater permit for construction activity. Common plan of development Chain of responsibility Prevention of topsoil compaction Soil type, Soil preservation Location and type of all temporary and permanent EP/SC, plus amendment process 10/5 acres drainage to a single point requires a temporary sediment basin Encourages a temporary sediment basin downstream of steep (>3:1) and highly erodible soils Permanent water treatment: 1 inch water quality volume retained on site per acre of cumulative impervious surface area Exempt/Not feasible, Exempt/Proximity, Exempt/Right of Way, Infiltration/Filtration, Regional Ponding or Wet Sedimentation Estimated preliminary quantities tabulated for the life of the project Acres of pre and post impervious surfaces Drainage flows, ultimate receiving waters Areas not to be disturbed (wetlands, buffers, special items) Phased construction Post-con maintenance plan Slide 15 Step 5. Identify waters that have the potential to receive a discharge of stormwater runoff or discharge from a permanent stormwater management system (I mile) Special waters Impaired waters programs/minnesotas-impaired-waters-and-tmdls/minnesotas-impaired- waters-and-total-maximum-daily-loads-tmdls.html programs/minnesotas-impaired-waters-and-tmdls/minnesotas-impaired- waters-and-total-maximum-daily-loads-tmdls.html Approved TMDL Implementation plan programs/minnesotas-impaired-waters-and-tmdls/tmdl-projects/tmdl- projects-and-staff-contacts.html programs/minnesotas-impaired-waters-and-tmdls/tmdl-projects/tmdl- projects-and-staff-contacts.html Other waters DNR Public Water Search Slide 16 Step 6. Determine if discharges from construction site will impact other protected resources The following list identifies protected resources in Minnesota. Listed endangered or threatened species or a designated critical habitat. Contact the U.S. Fish and Wildlife Service, Ecological Services, Midwest.U.S. Fish and Wildlife Service, Ecological Services, Midwest Minnesota listed endangered, threatened and special concern species. To obtain a list of these species in the site that you are going to be disturbing, submit a NHIS Data Request form with the Minnesota Department of Natural Resources Division of Ecological Resources.NHIS Data RequestMinnesota Department of Natural Resources Division of Ecological Resources Properties listed or eligible for listing in the National Register of Historic Places or known or discovered archeological sites. Contact Minnesota Historical Society National Register Properties Minnesota Historical Society National Register Properties MPCA Calcareous fens. If runoff from the site discharges to a calcareous fen as listed in Minn. R. 7050.0180, subp. 6.b., additional permit requirements apply. Use the Special Waters Search and quad map to identify your construction site and prepare a list of all the calcareous fens that have the potential to be impacted by discharges from the site. Special Waters Search: This is an electronic map tool using Geographic Information Systems (GIS) technology. Use this tool to identify your construction site and prepare a list of all the calcareous fens that have the potential to be impacted by discharges from the site. DNR Calcareous Fens. The Minnesota Department of Natural Resources (DNR) works closely with counties and citizens to identify sensitive and rare habitat resources. Calcareous fens identified through these efforts are compiled on the DNR List of Known Calcareous Fen Sites. The DNR Calcareous Fens are fens that appear on this list but are not yet listed by the MPCA as Outstanding Resource Value Waters. Construction that results in a discharge to this category of fen is covered under the general NPDES/SDS Construction Stormwater Permit, but must also meet the Wetland Conservation Act and wetland protection rules administered by the DNR. Special Waters Search This is an electronic map tool using Geographic Information Systems (GIS) technology. Use this tool to identify your construction site and prepare a list of all the calcareous fens that have the potential to be impacted by discharges from the site. Calcareous fens are identified on the Special Waters Search by the section in which the fen is located. Note: This is best viewed using Internet Explorer 5.0 or higher or Netscape 6.0 or higher, with pop-up blockers disabled and screen resolution set to 1024x768 or higher. Contact the appropriate DNR Regional Hydrologists: Northwest Region (Becker, Beltrami, Cass, Clay, Clearwater, Douglas, Grant, Hubbard, Kittson, Lake of the Woods, Mahnomen, Marshall, Norman, Otter Tail, Pennington, Polk, Pope, Red Lake, Roseau, Stevens, Traverse, Todd, Wadena and Wilkin counties) Larry Kramka 218-755-3973. Northeast Region (Aitkin, Carlton, Cook, Crow Wing, Itasca, Koochiching, Lake, Pine and St. Louis counties) Dan