Laserfiche WebLink
n <br /> Table 5. Weighted Average Concentration Calculation <br /> USe Average Daily Estimated Waste Weighted Average <br /> Flow Water Quality Product <br /> Residence 600 gpd 45 mg/L-N 27,000 gpd-mg/L-N <br /> Winery Staff 39.43 gpd 85 mg/L-N 3,351.6 gpd-mg/L-N <br /> Winery Customers 58.22 gpd 85 mg/L-N 4,948.7 gpd-mg/L-N <br /> Totals 697.65 gpd 35,300.3 gpd-mg/L-N <br /> Weighted Average 35,300.3 gpd-mg/L-N / 697.65 gpd = 60.5 mg/L-N <br /> Concentration: <br /> j/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 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 factor of 15 percent was selected for the Site because of the moderately <br /> fine-grained nature of the soils. <br /> Nitrate Loadina Estimate <br /> A nitrate loading scenario was employed to determine the impact from the proposed <br /> project to ground water. The scenario utilizes the variables discussed previously, which <br /> represent the estimated conditions and uses associated with this project. The following <br /> table presents a summary of the assumptions for the nitrate loading calculation for the <br /> Site, as presented in Plate 10. <br /> LOGE1003 Page 12 <br />