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Pearson Farm Residential Development EAW Draft — March XX, 2017 <br />require perimeter sediment control maintenance and sediment removal. BMPs to be implemented <br />during construction include: <br />1. Construction of temporary sediment basins in the locations proposed for stormwater <br />ponding, and development of these basins for permanent use following construction. <br />2. Installation of silt fence and other perimeter erosion controls prior to initiation of earthwork <br />and maintenance of these controls until viable turf or ground cover is established on exposed <br />areas. <br />3. Periodic street cleaning and installation of a rock construction entrance to reduce tracking of <br />dirt onto public streets. <br />4. Stabilization of exposed soils within the time limits specified in the General NPDES permit. <br />5. Energy dissipation, such as riprap, installed at storm sewer outfalls. <br />6. Use of cover crops, native seed mixes, sod, and landscaping to stabilize exposed surface <br />soils after final grading. <br />Erosion control plans will be reviewed and accepted by the City of Ramsey and the LRRWMO prior <br />to project construction. Potential adverse effects from construction -related sediment and erosion on <br />water quality will be minimized by implementation of the above BMPs during and after construction. <br />iii. Water Appropriation. Describe if the project proposes to appropriate surface or groundwater <br />(including dewatering). Describe the source, quantity, duration, use and purpose of the water use <br />and if a DNR water appropriation permit is required. Describe any well abandonment. If connecting <br />to an existing municipal water supply, identib, the wells to be used as a water source and any effects <br />on, or required expansion of municipal water infrastructure. Discuss environmental effects from <br />water appropriation, including an assessment of the water resources available for appropriation. <br />Identi any measures to avoid, minimize, or mitigate environmental effects from the water <br />appropriation. <br />Surface/Groundwater Appropriations and Dewaterinm <br />Project construction is expected to require dewatering and groundwater appropriation to facilitate <br />installation of sanitary sewer and excavation of a deep 3-acre pond, but the project will not involve <br />installation of new water wells. Project development will require a MN DNR water appropriation <br />permit if dewatering required for installation of utilities exceeds 10,000 gallons/day or 1 million <br />gallons/year. If construction dewatering does not exceed 50 million gallons in total and a duration of <br />one year from the start of pumping, the project proponent will be eligible for coverage under the <br />amended MN DNR General Permit 1997-0005 for temporary water appropriations. Although the <br />extent and duration of construction dewatering that may be necessary is currently unknown, <br />construction dewatering is expected to be unnecessary or temporary. Groundwater appropriated for <br />construction dewatering will be discharged to temporary sediment basins within the project area. It <br />is not anticipated that construction dewatering will be extensive or continue long enough to affect <br />nearby domestic water wells. <br />15 <br />