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Weighted Average Concentration Calculation <br /> Use Average Daily Estimated Waste Weighted Average <br /> Flow Water Quality Product <br /> Existing Residence 360 gpd 45 mg/L-N 16,200 gpd-mg/L-N <br /> Potential Future 240 gpd 45 mg/L-N 10,800 gpd-mg/L-N <br /> Residence <br /> Winery Customers 57.1 gpd 85 mg/L-N 4,853.5 gpd-mg/L-N <br /> Winery Staff 14.8 gpd 85 mg/L-N 1,258 gpd-mg/L-N <br /> Special Events Visitor 16.4 gpd 85 mg/L-N 1,394 gpd-mg/L-N <br /> Totals 688.3 gpd 34,505.5 gpd-mg/L- <br /> N <br /> Weighted Average 34,505.5 gpd-mg/L-N 1 688.3 gpd = 50.1 mg/L-N <br /> Concentration: <br /> Nitrate Loading. Estimate <br /> A nitrate loading scenario was employed to determine the impact from the <br /> proposed project to ground water. The scenario utilizes the variables discussed <br /> previously, which represent the estimated conditions and uses associated with <br /> this project. The following table presents a summary of the assumptions for the <br /> nitrate loading calculation for the Site, as presented in the attached Plate. <br /> Assumptions for Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Q 688.3 gpd Effluent flow rate <br /> Nw 50.1 mg/L-N Effluent stream concentration <br /> A 59.0 acres Site area <br /> Nb 1.00 mgIL-N Concentration of rain <br /> d 0.15 constant Denitrification factor <br /> inches per <br /> R 7.38 year Deep percolation of rain water <br /> inches per <br /> W 0.16 year Uniform waste water loading for calculation <br /> Page 6-2 <br />