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16-inch diameter watermain should be extended through the west portion of the <br />' development ideally within aCity-owned right-of--way. It could then be <br />downsized to a 12-inch diameter on the east side ofTH 10 within the 165th <br />Avenue right-of--way. The 12-inch diameter watermain should then be looped <br />' within the eastern portion of the development as shown on Figure 13-2 for <br />Scenario 1 or on Figure 13-3 for Scenarios 2 and 3. The 12-inch diameter <br />watermain should then be connected to the existing 16-inch watermain within <br />' 171St Avenue.. The remaining looping could be accomplished with 8-inch <br />diameter watermain as shown on the attached Figures 13-2 and 13-3. As the <br />City does not have a Comprehensive Water System Plan, the trunk watermain <br />' was sized in accordance with typical development recommendations. <br />D3. Any abandoned wells found within the study area will be sealed in accordance <br />' with Minnesota Department of Health {MDH) guidelines.. <br />D4. As the City currently does not have a Wellhead Protection Plan (WHPP), a <br />Drinking Water Supply Management Area (DWSMA) has not been established. A <br />DWSMA will -be detailed for future wells as they are constructed and when the <br />City is called into the WHPP program by the MDH. <br />E. Water Quality and Quantity Mitigation Plan <br />E1. Infiltration best management practices will be required. to meet volume control <br />goals as listed in Table 17-2. Group A soils within the Study Area will likely <br />provide sufficient infiltration capacity to achieve these goals. <br />E2. Design considerations for comprehensive storm water management should <br />include regional. ponding, individual site underground infiltration systems and a <br />perforated trunk storm sewer conveyance system. <br />E3. Approved Total Maximum Daily Loads (TMDL) load reductions and <br />implementation plans for the Mississippi River and the Rum River shall be <br />addressed by the development's storm water management plan. <br />E4. The storm water management plan(s) for the future developments will provide <br />an in depth analysis of existing and proposed drainage patterns and pollutant <br />loads.. The plan(s) will demonstrate. compliance with nondegradation, City and <br />other local storm water management requirements. <br />E5. It will be required that post-development discharge rates will be no greater than <br />pre-development discharge rates for the critical duration event to reduce <br />erosion impacts downstream of the site. <br />E6. The developer will be responsible for grading the site appropriately to provide <br />adequate storm water management to the extent necessary and will be required <br />to obtain the necessary permits for storm water management and grading, to <br />preserve the existing natural features, and to provide water quality protection to <br />City of Elk River <br />Draft Alternative Urban Areawide Review <br />August 2011 <br />Page 11 of 90 <br />