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Table 4. Average Daily Flow Calculation <br /> Use Units Rate Subtotal Reduction Average Daily <br /> Flaw <br /> Existing 4.0 bed 480 gallons per <br /> Residence rooms 120 gal/br/day 480 gpd None day <br /> and Apt. <br /> Winery Staff 4 staff 13 gal/staff 52 gpd 7/8 45.5 gallons per <br /> (7 days) day <br /> Winery 100 gallons per <br /> Customers 20 cust 5 gal/cust 100 gpd None day <br /> (7 days) <br /> The reduction factor accounts for the short workday(hours from 10 a-m_to 5 p.m.). dill <br /> Table 5. Weighted Average Concentration Calculation <br /> Use Average Daily Estimated! Waste Weighted Average <br /> Flow Water Quality Product <br /> Residence 480 gpd 45 mg/L-N 21,600 gpd-mg/L-N <br /> Winery Staff 45.5 gpd 85 mg/L-N 3,867.5 gpd-mg/L-N <br /> Winery Customers85 mg/L-N 8,500 gpd-mg/L-N <br /> Totals __L_.625.5 gpd 33,967.5 gpd-mg/L-N <br /> Weighted Average <br /> Concentration: 33,967.5 gpd-mg/L-N 1 625.5 gp = 54.3 mg/L-N <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 (N2) 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 /> percent, and soils with high sand content and fast percolation rates tend to denitrify at a <br /> lower rate of about 10 percent. <br /> A denitrification factoof 20 percent as selected for the Site because of the moderately <br /> fine-grained nature a e so' <br /> 4 LOGE1013 Page 11 <br /> i <br />