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upgrading". <br />For purposes of this AUAR, it is assumed that the available capacity in the MCES <br />Regional System is at a minimum 2.8 MGD and could be as high as 3.8 MGD without <br />requiring significant upgrades. This 3.8 MGD figure is based on a telephone <br />conversation held in February of 2003 in which MCES Officials indicated that additional <br />capacity may be available due to slower than anticipated growth and development in <br />other cities. Therefore, it is recommended that the City contact MCES to formalize a <br />new agreement on existing and future available capacity. Future decisions on growth, <br />and the need for infrastructure iuveitleili:s, can then be planned and executed as <br />necessary. <br />Existing Urban Flows Within the existing Urban Wastewater Service Area (Table <br />18.2), approximately 1,500 residential households and 250 acres of commercial, <br />industrial and institutional development are served by the MCES regional interceptor. <br />The entire Urban Service Area is divided into two service districts that connect to <br />separate regional interceptors: the Mississippi River District and the Rum River District <br />(Figure 18.2). These Districts are divided somewhat along the watershed divide for the <br />two rivers. <br />Table 18.2: Existing MUSA (Category 1) Flows by District <br />Description <br />Average <br />Daily Flow <br />(MGD) <br />Peak <br />Hourly <br />Flow <br />(MGD) <br />Average <br />Annual <br />Flow <br />(MGY) <br />Average <br />Daily Flow <br />Capacity <br />(MGD) <br />Peak Hourly <br />Flow <br />Capacity <br />(MGD) <br />Mississippi River MUSA District <br />0.161(1) <br />0.475 <br />1.120 <br />59 <br />143 <br />202 <br />- <br />- <br />2.8 to 3.8 <br />10 <br />8 <br />18 <br />Rum River MUSA District <br />0.390(2) <br />TOTAL <br />0.551 <br />1.595 <br />(1) Based on 2002 monthly flow records provided by MCES. (2001 Comp Plan estimated at 0.199 <br />MGD) <br />(2) Based on 2002 average quarterly flow monitoring records provided by MCES. (2001 Comp Plan <br />estimated at 0.406 MGD) <br />(3) Peak hourly flows were calculated using average design value formulas. <br />The two regional interceptors serving the City have a combined peak capacity of 18.0 <br />MGD. The Rum River MUSA District, which is served by a 30-inch diameter <br />interceptor, has a maximum design capacity of about 8 million gallons per day (MGD). <br />The Mississippi River MUSA District, which is served by a 30-inch diameter interceptor, <br />has a maximum peak design capacity of about 8 MGD. As stated earlier, it is assumed <br />that 2.8 to 3.8 MGD of average daily flow capacity is available in the regional system. <br />Therefore, it appears that approximately 1.2 to 2.2 MGD of average daily capacity is <br />currently available, without upgrades to regional facilities, for future development in <br />Ramsey. <br />The capacity of the MCES interceptors appears to be adequate for the existing average <br />daily and peak hourly wastewater flows from each District. In addition, the combined <br />average daily flow of 0.551 MGD does not exceed the MCES limit of 2.8 to 3.8 MGD. <br />18-6 <br />