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The maximum average daily flow for the Site was estimated to be 438.4 gallons per day (gpd). Through the use of a weighted average, the average concentration of the different effluent flows and concentrations was determined to be 37.1 mg/L-N at 438.4 gallons per day. Please see the following tables: Table 4. Average Daily Flow Calculation Use units Rate Subtotal Reduction Average Daily Flow Residences bedroom 140 gal/bedroom 420 gpd none 420 gpd Tasting Room 1 13 gallemployee 13 gal 317 5.6 gal Employee employee Tasting Room 10 3 gal/customer 30 gpd 317 12.8 gpd Customers Total 438.4 gpd Reduction factors convert calculated Row into average daily flow over a year: 317 converts for days of operation per week. These reduction factors need to be taken into account since not all parts of the facility are in operation at all times. Table 5. Weighted Average Concentration Calculation Use Average Daily Estimated Waste Weighted Average Flow Water Quality Product Residence 420 gpd 35 mglL-N 14,700 gpd-mg/L-N Employee 5.6 gal 85 mg/L-N 476 gpd-mg/L-N Customers 12.8 gpd 85 mg/L-N 1,088 gpd-mg/L-N Totals 438.4 gpd 16,264 gpd-mg/L-N Weighted Average 15,264 gpd-mglL-N 1 438.4 gpd = 37.1 mg/L-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 (Nz) 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 LOGE 1729 Page 11