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Table 5. Weighted Average Concentration Calculation Use Average Daily Estimated Waste Weighted Average Flow Water Quality Product Winery (harvest)Staff 65 gpd 85 mg/L-N 5,525 gpd-mg/L-N Winery Staff 111.4 gpd 85 mg/L-N 9,469 gpd-mg/L-N (off-season) Special Events Staff 16.0 gpd 85 mg/L-N 1,360 gpd-mg/L-N Special Events Customers 51.4 gpd 85 mg/L-N 4,369 gpd-mg/L-N / Totals 4,335.5 gpd 2550,877.5 gpd-mg/L-N Weighted Average 250,877.5d-m /L-N / 4 335.5 gp g gpd= 57.9 mgIL-N Concentration: Denitrification Reductions Denitrification is a process that occurs in the septic system drain field whereby certain bacteria oxidize the nitrate (NO3) in the wastewater and release nitrogen gas (N2) to the atmosphere. Due to the biologic processes in the shallow soils, nitrogen in the drain field will may undergo a reduction between 10 percent to 35 percent. Soils with higher clay content, moist soil conditions, high pH, and organic material denitrify by about 35 percent, and soils with high sand content and fast percolation rates tend to denitrify at a lower rate of about 10 percent. A typical denitrification facto f 25 percent as selected for the Site because of the moderately fine-grained natur Nitrate Loading Estimate A nitrate loading scenario was employed to determine the impact from the proposed project to ground water. The scenario utilizes the variables discussed previously, which represent the estimated conditions and uses associated with this project. The following table presents a summary of the assumptions for the nitrate loading calculation for the Site, as presented in Plate 13. LOGE 1508 Page 14