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Table 18.1: Projected Wastewater Composition and Loadings <br />Contaminant <br />Total Dissolved Solids <br />Total Suspended Solids <br />Biochemical Oxygen Demand - 5-Day (BOD5) <br />Chemical Oxygen Demand (COD) <br />Nitrogen (Total as N) <br />Phosphorous (Total as P) <br />(1) Based on a projected annual flow of 2,336 MGY. <br />(2) Phosphorous levels are somewhat elevated to compensate for disposal and restaurant wastes. <br />Concentration <br />(mg/1) <br />500 <br />220 <br />250 <br />500 <br />50 <br />10(2) <br />Total Annual Mass <br />Loading' (tons <br />4,871 <br />2,143 <br />2,435 <br />4,870 <br />487 <br />97 <br />Wastewater from the RTC development is considered domestic as no industrial waste is <br />proposed. Table 18.1 lists the projected composition of the wastewater and the projected <br />concentration of common contaminants. The above projected loadings fall within the <br />range of average" wastewater strengths. Because of this, it appears that the MCES <br />Metro Wastewater Treatment Plant will be able to handle the projected waste <br />composition and loadings from the RTC Development. <br />18b. Description of Existing Wastewater Management Systems <br />Local Collection System Capacity Within each of the Districts, wastewater is collected <br />and transported to the main interceptors primarily by gravity sewer. When necessary, <br />pumping stations and force -mains are used to overcome elevation changes. Inflow and <br />infiltration into the sanitary sewer is expected to be minimal due to the relatively new age <br />of the system. <br />The City's Comp Plan documented MCES Projected Wastewater flows for the City of <br />Ramsey to be between 542 and 668 MGY or a maximum of 1.8 MGD. The Sewer Plan <br />indicated that at full build out, 2.8 MGD of flow would be generated by a sewered <br />population of 27,200 persons and a sewered employment of 7,000 employees. It appears <br />that the existing sewer collection system has been designed to accommodate the larger <br />flow of 2.8 MGD. <br />Regional Interceptor Capacity — Availability of capacity in the regional interceptor <br />system depends on several factors but is generally based on Met Council design and <br />growth projections for developing communities. The Comp Plan indicates that Met <br />Council projections of wastewater flows for the City of Ramsey in 2020 were between <br />1.5 and 1.8 MGD. The Sewer Plan states that the two regional interceptors serving <br />Ramsey were design to handle a combined average daily flow of 7.87 MGD. However, <br />the regional facilities downstream of the interceptors are not. The Sewer Plan also states <br />that approximately 30% (2.8 MGD) of the capacity at the Anoka lift station is reserved <br />for Ramsey. In either case, the Comp Plan states that —If and when growth or sewer <br />demand exceeds the current regional facility sizing, those facilities will require <br />18-5 <br />