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CALCAREOUS FENS:KARST AREA PROTECTION:IMPAIRED AND SPECIAL WATERSSpecial or impaired waters within 1 mile of this site include the Mississippi River for Scenic and Recreational Segments.BMPs found in NPDES CWS Permit 23.9, 23.10, and 23.11 must be incorporated.There is no active Karst in this site.No calcareous Fen sites exist on this project.There are no stormwater mitigation measures proposed as part of environmental, endangered species, archaeological orother required local, state or federal reviews conducted for the project.MITIGATION DUE TO REVIEWS:EROSION CONTROL QUANTITIES:STORM WATER POLLUTION PREVENTION PLAN (SWPPP)PROJECT DESCRIPTION:SWPPP IMPLEMENTATIONMajority A SoilsConstruction to begin fall 2022. Silt fence around where specified and Rock entrances to be installedbefore any of the following scheduled events take place. Existing structures shall also be protected fromsediment from the start of construction. 1. Grading 2. Road prep and construction 3. Infiltration pond final gradingConstruction completion expected Fall 2022. All temporary erosion control measures will be removedand disposed of according to MPCA requirements. Final stabilization will be established.If construction is not completed before winter, stockpiles and any slopes must be stabilized with appropriate BMPs (mulch,seed, erosion control blanket) as applicable to avoid erosion in the following spring season.See NPDES CWS Permit Part 11 for inspection frequency adjustments throughout the course ofscheduled construction.CONSTRUCTION SEQUENCE:CALCULATIONS:SOIL TYPES:TIMING OF BMP INSTALLATIONPROJECT CONTACT IMPLEMENTATION/MAINTENANCE:This proposed site plan consists of the new construction of a new parking lot and access. This will include regrading and paving. The total area ofconstruction and grading will be approximately 1.6 acres.The new parking lot will flow to the proposed infiltration areas on the property.The Contractor is responsible for implementation of the SWPPP and the installation, inspection, and maintenanceof the erosion prevention and sediment control BMPs before and during construction. The Contractor will have an Erosion Control Supervisorwho is responsible for coordinating the erosion prevention and sediment control BMPs.Spectrum High School is responsible for long term operation and maintenance of the permanent storm water management system.Erosion and Sediment Control, BMP Inspection Performed By:xxxxLong Term Pond Maintenance Provided By:Spectrum High SchoolThe erosion prevention and sediment control BMPs shall be installed as necessary to minimize erosion from disturbed surfaces andcapture sediment on site.1. Erosion and sediment control BMPs must be installed prior to the start of construction.2.Where applicable, disturbed areas will immediately be temporarily stabilized prior to permanent turf establishment whenever constructionceases for 7 days, with special consideration of areas within 200 feet continuous positive slope of a surface water.3.Temporary or permanent energy dissipation shall be placed at pipe outlets within 24 hours after connection to a surface water.4.Temporary stabilization of stockpiles must be initiated immediately to limit soil erosion whenever any construction activity haspermanently ceased on any portion of the site and will not resume for a period exceeding 7 calendar days.5.Planned slopes of 1:3 (V:H) or steeper and greater than 75 ft. in length will be temporarily or permanently stabilized in incrementsnot to exceed 75 ft., prior to constructing or disturbing a new increment.6.BMPs must remain in place until final stabilization is achieved and permit NOT has been submitted to the MPCA.7.The normal wetted perimeter of any temporary or permanent drainage ditch or swale that drains water from any portion of theconstruction site, or diverts around the site, must be stabilized within 200 lineal feet from the property edge, or from the point ofdischarge into any surface water. Stabilization of the last 200 lineal feet must be completed within 24 hours after connecting to a surfacewater.8.Developer/Contractor is responsible for removal of silt fence upon turf establishment.9.Seeding of site shall be completed within two weeks of grading completion.Total Area of Grading = Roadway and Ponds = 1.6 AcresTotal Existing Impervious = 106,236 Square FeetTotal New Impervious = 152,166 Square FeetWATER QUALITY VOLUME (TOTAL)= (1.1")(1'/12")(152,166 SF) = 13,949 CFBLOCH ENGINEERING, PLLCblochengineering.com32210 XEON ST NWCAMBRIDGE, MN 55008krystle@blochengineering.comNCHBLENGINEERING