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Table 3. Average Daily Flow Calculation <br /> Use Units Rate Subtotal Reduction Average Daily <br /> Flow <br /> Residence bedroom 6 0 gal/ 350 gpd none 350 gpd <br /> Winery <br /> Customers 20 3 gal/customer 60 gpd 2/7 17.1 gpd <br /> (Sat.-Sun.) <br /> Event <br /> Customers 100 3 gal/customer 300 gal 24/365 19.7 gal <br /> (24 events per <br /> year) <br /> Total 386.8 gpd <br /> Reduction factors convert calculated flow into average daily flow over a year: 4/7 converts for days of operation per <br /> week. These reduction factors need to be taken into account since not all parts of the facility are in operation at all <br /> times. <br /> Table 4. Weighted Average Concentration Calculation <br /> Use Average Daily Estimated Waste Weighted Average <br /> Flow Water Quality Product <br /> Residence 350 gpd 35 mg/L-N 12,250 gpd-mg/L-N <br /> Winery Customers 17.1 gal 85 mg/L-N 1,453.5 gpd-mg/L-N <br /> Event Customers 19.7 gpd 85 mg/L-N 1,674.5 gpd-mg/L-N <br /> Totals 386.8 gpd 15,378 gpd-mg/L-N <br /> Weighted Average 15,378 gpd-mg/L-N / 386.8 gpd = 39.8 mg/L-N <br /> Concentration: <br /> Denitrification Reductions <br /> Denitrification is a process that occurs in the septic system drain field whereby certain <br /> bacteria oxidize the nitrate (NO3) in the wastewater and release nitrogen gas (N2) to the <br /> atmosphere. Due to the biologic processes in the shallow soils, nitrogen in the drain <br /> field may undergo a reduction between 10 percent to 35 percent. Soils with higher clay <br /> content, moist soil conditions, high pH, and organic material denitrify by about 35 <br /> percent, and soils with high sand content tend to denitrify at a lower rate of about 10 <br /> percent. <br /> LOGE 20-19 Page 13 <br />