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STORM WATER POLLUTION PREVENTION PLAN (SWPPP) <br />PROJECT DESCRIPTION <br />The existing 1.78 acre site is being regraded. Four new residential townhome buildings and corresponding drive lane/parking lot will be constructed. <br />An Infiltration pond, which also controls outflow rate, is proposed. Runoff will be carried to the infiltration via overland flow and swales, with a <br />vegetated strip between pavement and infiltration. <br />Grading, infiltration, and paving will be installed as part of this project along with building construction. <br />SWPPP IMPLEMENTATION <br />The Project Engineer and the Contractor are responsible for implementation of the SWPPP and the installation, inspection, and maintenance <br />of the erosion prevention and sediment control BMPs before and during construction. The Contractor will have an Erosion Control Supervisor <br />who is responsible for coordinating the erosion prevention and sediment control BMPs. Dustin Heggem and staff are also available for assistance. <br />Acuity Group is responsible for long term operation and maintenance of the permanent storm water management system. <br />PROJECT CONTACT IMPLEMENTATION/MAINTENANCE: <br />Erosion and Sediment Control, BMP Inspection Performed By: <br />Krystle Bloch <br />507-995-2981 <br />PTS Land Services, Inc <br />826 NW 30th St. <br />Faribault, MN 55021 <br />Long Term Pond Maintenance Provided By: <br />Acuity Group <br />564 Dodge Ave Ste A <br />Elk River, MN <br />TIMING OF BMP INSTALLATION <br />The erosion prevention and sediment control BMPs shall be installed as necessary to minimize erosion from disturbed surfaces and <br />capture sediment on site. <br />1. Erosion and sediment control BMPs must be installed prior to the start of construction. <br />2. Where applicable, disturbed areas will immediately be temporarily stabilized prior to permanent turf establishment whenever construction <br />ceases for 7 days, with special consideration of areas within 200 feet continuous positive slope of a surface water. <br />3. Temporary or permanent energy dissipation shall be placed at pipe outlets within 24 hours after connection to a surface water. <br />4. Temporary stabilization of stockpiles must be initiated immediately to limit soil erosion whenever any construction activity has <br />permanently ceased on any portion of the site and will not resume for a period exceeding 7 calendar days. <br />S. Planned slopes of 1:3 (V:H) or steeper and greater than 75 ft. in length will be temporarily or permanently stabilized in increments <br />not to exceed 75 R., prior to constructing or disturbing a new increment. <br />6. BMPs must remain in place until final stabilization is achieved and permit NOT has been submitted to the MPCA. <br />7. The normal wetted perimeter of any temporary or permanent drainage ditch or swale that drains water from any portion of the <br />construction site, or diverts around the site, must be stabilized within 200 lineal feet from the property edge, or from the point of <br />discharge into any surface water. Stabilization of the last 200 lineal feet must be completed within 24 hours after connecting to a surface <br />water. <br />CAI CI II ATInNS- <br />Total Area of Grading = 1.8 Ac <br />Total Existing Impervious = 0 Square Feet <br />Total New Impervious = 30,627 Square Feet <br />VOLUME = (1")(V/12")(30,627 SF) = 2,2553 CF <br />SOIL TYPES: <br />Majority A Soils <br />NPDES PERMIT REFERENCES: <br />III.A.1-4 <br />III.A.S.a-b, d, e, f, g-I <br />III.A.B.a,b <br />III.B <br />III. D <br />III. E <br />III <br />.F <br />IV.B.1-6 <br />IV.C.1-6,8,10 <br />IV.D.1-3 <br />IV.E <br />IV.F (ail) <br />IV.G.1-3 <br />APPENDIX A, B.10 <br />APPENDIX CA, C.2 <br />CONSTRUCTION SEOUENCE <br />Construction to begin spring 2018. Silt fence around where specified and Rock entrances to be installed <br />before any of the following scheduled events take place. Existing structures shall also be protected from <br />sediment from the start of construction. <br />1. Grading (excluding pond excavation) <br />2. Buildings installed <br />3. Driving area installed <br />4. Excavation of Pond <br />S. Landscaping and Turf Restoration <br />Construction completion expected Fall 2018. All temporary erosion control measures will be removed <br />and disposed of according to MPCA requirements. 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