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<br />receive temporary seeding and mulching within 14 days of completion of rough grading. Steep slopes <br />such as but not limited to pond slop-es, swales, house pad walk-out areas shall receive wood fiber <br />blanket protection or suitable spray on mulch in lieu of traditional straw mulch. Once the site has <br />undergone final grading and all improvements are completed, permanent seeding will be done. <br />La,yns Vt'iH be established by individ uallot o,vners. \ <br /> <br />Detention/Sedimentation Basins: The site grading provides for detention/sedimentation basins with <br />controlled discharge rates and provisions for water quality via skimmers and sediment storage. <br />The devices and installation will be in accordance ,,'ith Best Management Practices for Minnesota for <br />this project. The project l\'ill adopt the City of Elk River Storm Water Pollution Prevention Plan. <br />Modifications to that plan will be made for site specific conditions. Temporary and permanent storm <br />water sediment basins and ponds as describe in the MPCA/NPDES General Permit, Permit No. MN ~ <br />RI00001 will be constructed and properlJT maintained so as not to cause nuisance conditions, erosion <br />in receiYing channels or on adjacent properties or inundation in wetlands causing significant adverse <br />impact to the wetlands. These temporary and permanent facilities will be located throughout the <br />project, receiving storm water discharges from piping systems prior to discharge to the receiving <br />waters. Post-development discharge rates from the ponding facilities will be less than or equal to tbe <br />pre-development discharge rates for the site. Infiltration options will be utilized on ponds to help <br />reduce the discharge volumes where possible. <br /> <br />The steep slope along the north edge of the large central wetland basin is to remain undisturbed <br />during construction of the infrastructure for this project. <br /> <br />17 . Water quality: surface water runoff <br />a. Compare the quantity and quality of site runoff before and after the project. Describe pennanent <br />controls to manage or treat runoff. Describe any stonnwater pollution prevention plans. <br /> <br />Quantity of site runoff before and after the project will increase due to conversion of land use from <br />agricultural to residential. The addition of roofs, driveways, and streets is the primary contributing <br />element to the increase in volume. Peak discharge rates are likely to increase. Stormwater detention <br />ponds will be constructed to mitigate quantity, quality and discharge rates. <br /> <br />Quality of site runoff before and after the project is expected to improve. Stormwater ponds will <br />provide for ,,'ater qualit), control through use of sediment storage and skimming of the discharge <br />flovr. In addition~ buffer strips w'ilI be added and seeded to adjoin the existing wetlands. <br /> <br />b. Identify routes and receiving water bodies for runoff from the site; include major dO\\-TIStream \vater <br />bodies as well as the immediate receiving \vaters. Estimate impact runoff on the quality of receiving waters. <br /> <br />Receiving "rater bodies for runoff from the site include wetland basins and ditch systems. The runoff <br />",'ill be controlled to existing peak discharge flOllr rate and subject to the provisions provided by the <br />water quality features in the stormll'ater detention basins. <br /> <br />Impacts to the receiving streams are expected to be fully mitigated ,,'ith these provisions. <br /> <br />18. Water quality: wastewaters <br />a. Describe sources, composition and quantities of all sanitary, municipal and industrial wastewater <br />produced or treated at the site. <br /> <br />Waste"rater is limited to domestic se,,"'age. Usage is estimated to be 100 gallons per capita per day for <br />the residential area. Usage is estimated at 20 gallons per student (900 students). The total estimated <br />usage is 140,000 gpd. <br /> <br />b. Describe \\'aste treatment methods or pollution prevention efforts and give estimates of composition after <br />treatment. Identify receiving \vaters, including major dO\\'Dstream \vater bodies, and estimate the discharge <br />impact on the quality of receiving waters. If the project involves on-site sewage systems, discuss the <br />suitability of site conditions for such systems. <br /> <br />The sanitary ,,'aste for the single family and proposed school will be normal domestic se,"'age, which <br />\\~ill be treated at the City's 1\1unicipal Plant. <br /> <br />c. If \vastes \"vill be discharged into a publicly- 0\\T1::0 treatr11ent facility, identify the facility! describe any <br />