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w a t e r <br />E07 e c o l o g y <br />community <br />Project Name FS4 Hugo -Gregoire Date 1 8/16/18 <br />To / Contact info Chuck Beisner, Project Development Manager, SEV <br />Cc / Contact info, Rachel Juba, Community Development Director, City of Hugo Received <br />of <br />Paula Kalinosk y EOR City Augus Hugo <br />st 16, 2018 <br />From / Contact info Ryan Fleming EOR <br />Jason Naber EOR <br />Regarding I Preliminary Stormwater Management Design for FS4 Hugo -Gregoire Solar Garden <br />Stormwater Management and Hugo -Gregoire <br />This memo contains a summary of preliminary stormwater management design elements for <br />FastSun 4, Hugo -Gregoire, the proposed solar garden at 7260 165th St N, Hugo, MN 55038. This <br />information is being provided at the request of the City of Hugo as a supplement to the materials <br />submitted by Sunrise Energy Venture for the Condition Use Permit application for this site. <br />Although stormwater design is still at a preliminary stage for this site, key components of the <br />design - treatment requirements, volume to be treated, appropriate best management practices for <br />the site context - have been determined. These are explained in as much detail as is possible at this <br />stage in the design process. <br />Site Grading Impacts <br />The proposed solar garden is located on a portion of the property that exhibits gently undulating <br />slopes of less than seven percent. Therefore, the only anticipated grading will be to construction <br />the access road and stormwater features. A site grading plan will be developed for the building <br />permit submittal and construction plan set. <br />Erosion and Sediment Control <br />Prior to construction, the applicant will submit a Stormwater Management Pollution Prevention <br />Plan (SWPPP) to fulfill the requirements of the Minnesota NPDES General Construction Stormwater <br />Permit. These requirements includes temporary practices such as silt fence and storage ponds to <br />control runoff sediment during construction as well as permanent practices such as appropriate <br />vegetation and permanent stormwater facilities ensure downstream water quality is protected. <br />Stormwater Management <br />Stormwater management best management practices (BMPs) will be constructed to reduce <br />nutrient and sediment pollution following the requirements of the Minnesota Pollution Control <br />Agency (MPCA) and the Rice Creek Watershed District (RCWD); and to ensure that stormwater is <br />not discharged from the site at rates exceeding existing conditions according to RCWD Rule 7.a. <br />Water quality treatment will be achieved by installing filtration practices in strategic areas to <br />capture and treat runoff from the access road and solar panel. Preliminary stormwater BMP sizing <br />calculations have been completed following the Minnesota Pollution Control Agency (MPCA) <br />method for calculating impervious surface for solar panels. Based on the required water quality <br />treatment volume and the cohesive nature of the underlying soil, the area required to provide <br />treatment for the access road and solar panel array is approximately 1,800 square feet (0.4 acres). <br />Stormwater treatment practices will be located along the edges of the solar array, and along the <br />EOR is an Equal Opportunity Affirmative Action Employer <br />Emmons & Olivier Resources. Inc. 7030 6`' St. North Oakdale. MN 5512.8 T/ 651.770.8448 F/ 651.770.2552 www.eorinc.com <br />