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Mississippi River MUSA District — To determine future wastewater flows, the Mississippi <br />River MUSA District Urban Growth Area was divided into five sub -districts: the existing <br />MUSA Sub -district, the Rural Sub -district, the RTC Sub -district, the Northwest Sub- <br />district and the Southwest Sub -district (Figure 18.2). The projected wastewater flows for <br />the RTC Sub -District are given in Tables 18.3 and 18.4, respectively, for residential and <br />commercial/service development. <br />Table 18.3: Projected Wastewater Flows for RTC Sub -District Residential Development <br />Development <br />Type <br />Quantity <br />Occupants <br />per Unit <br />Total <br />Occupants <br />Flow per <br />Occupant <br />(gpd) <br />Total <br />Flow <br />(gpd) <br />Mixed Use <br />Residential <br />1012 <br />5 <br />5,060 <br />75 <br />379.500 <br />Apartment <br />172 <br />3 <br />516 <br />75 <br />38,700 <br />Duplex <br />62 <br />4 <br />186 <br />75 <br />13,950 <br />Townhouse <br />1154 <br />4 <br />4,616 <br />75 <br />346,200 <br />Total Residential <br />2,400 <br />10,378 <br />75 <br />778,350 <br />Table 18.4: Projected Wastewater Flows for RTC Commercial/Service Development <br />Development Type <br />Acres <br />Used <br />(ac) <br />Flow per <br />Acre (gpd) <br />Total <br />Flow <br />(gpd) <br />Commercial (Existing Hwy. 10) <br />32.2 <br />1,500 <br />48,300 <br />Commercial <br />(Service/Convenience) <br />11.6 <br />1,500 <br />17,400 <br />Commercial (Shopping) <br />24.4 <br />1,200 <br />29,280 <br />Mixed Use (Retail/Office) <br />30.6 <br />1,700 <br />52,020 <br />Civic Center <br />3.6 <br />10,000 <br />36,000 <br />Business Enterprise <br />35.9 <br />1,000 <br />35,900 <br />Transit <br />4.5 <br />1,000 <br />4,500 <br />Public/Open Space <br />58.2 <br />100 <br />5,820 <br />Total Developed Area <br />201 <br />229,220 <br />The combined future wastewater average and peak daily flows for the entire Mississippi <br />River MUSA District are 4.099 MGD and 8.746 MGD, respectively (Table 18.5). These <br />flows are well within the range for the design of the local regional interceptor which has a <br />peak daily capacity of 10 MGD. However, it does appear that improvements to <br />downstream MUSA infrastructure, such as the Anoka lift station, may be required at <br />some future date. <br />18-8 <br />