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Table 5. Weighted Average Concentration Calculation (Typical Use) <br /> Use Average Daily Estimated Waste Weighted Average <br /> Flow Water Quality Product <br /> Old Clubhouse 280.0 gpd 35 mg/L-N 9,800.0 gpd-mg/L-N <br /> New Clubhouse --- --- --- <br /> Trailers 276.2 gpd 35 mg/L-N 9,667.0 gpd-mg/L-N <br /> (1 bedroom each) <br /> Annual Party 0.68 gpd 85 mg/L-N 57.8 gpd-mg/L-N <br /> Totals 556.9 gpd 19,524.8 gpd-mg/L-N <br /> Weighted Average 19,524.8 gpd-mg/L-N / 556.9 gpd = 35.0 mg/L-N <br /> Concentration: <br /> Estimated Flow and Concentration (Full Occupancy) <br /> For the full occupancy scenario, it was assumed that both two-bedroom houses and all <br /> 16 trailers would be continuously occupied. Based on the potential full occupancy of the <br /> Site, the maximum average daily flow for the Site was estimated to be 2,800.68 gallons <br /> per day (gpd). <br /> • A typical residential concentration of 35 mg/L of nitrate as nitrogen (N) is selected for <br /> the clubhouses and trailers, and a concentration of 85 mg/L is selected for the annual <br /> party usage (Crites and Tchobanoglous, 1998). <br /> Through the use of a weighted average, the average concentration of the different <br /> effluent flows and concentrations was determined to be 35.0 mg/L-N at 2,800.68 gallons <br /> per day. Please see the following tables for details. <br /> • LOGE 1708 Page 13 <br />