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Table 4. Average Daily Flow Calculation <br /> Use Units Rate Subtotal Reduction Average Daily <br /> Flow <br /> Two Existing <br /> Residences/ 9 bed 120 gal/brlday 1080 gpd None 1080 gallons per <br /> Proposed rooms day <br /> dwelling unit <br /> Winery Staff 2 staff 13.gal/staff 26 gpd 5/7 18.5 gallons per <br /> Mon-Fri day <br /> Winery 7.43 gallons per <br /> Tasting 1 staff 13 gal/staff 13 gpd 417 day <br /> Thu-Sun <br /> Winery 10 oust 5 gal/oust 50 gpd 417 28.6 gallons per <br /> Customers day <br /> Reduction factors convert calculated flow into average daily flow over a year. This needs to be taken into account <br /> since winery hours and days are not continuous. No reduction is used for a residence since it is continuously <br /> occupied. <br /> Table 5. Weighted Average Concentration Calculation <br /> UseAverage Daily Estimated Waste Weighted Average <br /> Flow Water Quality Product <br /> Residence/Second <br /> Dwelling Unit 1480 gpd 45 mg/L-N 48,600 gpd-mgIL-N <br /> Winery Staff 18.5 gpd 85 mg/L-N 1,572.5 gpd-mg/L-N <br /> Winery Tasting 7.43 gpd 85 mgIL-N 631.6 gpd-mg/L-N <br /> Winery Customers 28.6 gpd 85 mg/L-N 2,431.0 gpd-mg/L-N <br /> Totals 1,134.5 gpd 53,235.1 gpd-mg/L-N <br /> Weighted Average 53,235.1 gpd-mgIL-N 1 1,134.5 gpd = 46.9 mgIL.-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 waste water and release nitrogen gas (Nz) to the <br /> atmosphere. Due to the biologic processes in the shallow soils, nitrogen in the drain <br /> field will may undergo a reduction between 10 percent to 35 percent. Soils with higher <br /> clay content, moist soil conditions, high pH, and organic material denitrify by about 35 <br /> L.OGE0915 Page 11 <br />