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Table 18-4 summarizes the estimated wastewater characteristics and loading for <br />the wastewater that will be generated from the 171St Avenue Area under Scenario 1. <br />Table 18-4. Estimated Wastewater Characteristics and Total Average Daily Wastewater <br />Loading from Scenario 1 <br /> <br />Parameter Estimated Wastewater Characteristics and Average <br />Day Loading <br /> mg/I Ibs/day <br />Biochemical Oxygen Demand 295 332 <br />Total Suspended Solids 150 169 <br />Total Phosphorous 6.5 7 <br />The wastewater generator from the study area will be conveyed north through the <br />existing 15-inch and 18-inch trunk sewer lines along Twin Lakes Road and then <br />west along 179th Avenue NW through the 24-inch trunk sanitary sewer to the TH <br />169 Lift Station. <br />Wastewater from the portion of the study area on the west side of TH 10 could be <br />conveyed north through a new sanitary sewer line constructed along the west side <br />of TH 10 and connected to the existing 15-inch sewer that crosses TH 10 just north <br />of 170th Avenue (Figurel8-1). An 8-inch sewer would be large enough to convey <br />the estimated peak hour flow of 0.17 MGD wastewater generated from this area <br />west of TH 10. However, because the current urban service area boundaries extend <br />beyond the limits of the study area, a 10-inch sanitary sewer is recommended to <br />provide additional capacity for future development. <br />Wastewater from the portion of the study area between TH 10 and the Burlington <br />Northern Railroad could be conveyed north and connected to the existing 15-inch <br />sewer that extends north to 173~d Avenue (Figure 18-1). Again, an 8-inch gravity <br />sewer would be large enough to convey the estimated peak hour flow of 0.36 MGD <br />from the portion of the study area between TH 10 and the Burlington Northern <br />Railroad. However, because the current urban service area boundaries extend <br />beyond the limits of the study area, a 12-inch sanitary sewer is recommended to <br />provide additional capacity for future development. <br />Under this scenario, the collection system, including the TH 169 Lift Station, and the <br />WWTF have the available capacity to handle the additional flows from the AUAR <br />Study Area. <br />Scenario 2 <br />Under this scenario the portion of the study area west of TH 10 would consist of <br />approximately 46 acres of high density residential with 368 units, 28 acres of <br />destination retail, and 3 acres service/commercial. An average daily wastewater <br />flow of 200 gpd/unit will be used for high density residential and 1,000 gpd/acre <br />will be used for destination retail and service/commercial. A peaking factor of 3.8 <br />was used to determine the peak hour flow from the overall AUAR area under this <br />City of Elk River <br />Draft Alternative Urban Areawide Review <br />July 2011 <br />Page 46 of 84 <br /> <br />