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The daily flow and weighted average are calculated as follows: Table 3. Average Daily Flow Calculation Use Units Rate Subtotal Reduction* Average Daily Flow Employees 14 13 gal/employee 182 gpd 59/365 29.4 gpd (59 days per year) Customers,Wine Tasting Events 80 9 gal/customer 720 gpd 49/365 96.6 gpd (49 per year) Customers,Marketing Events 130 9 gal/customer 1,170 gpd 10/365 32.0 gpd (10 days per year) Parking Attendants, (4 hr.shifts, 2 13 gal/employee 26 gpd 4/8,59/365 2.1 gpd 59 days per year) Residence 4 bedroom 140 gal/bedroom 560 gpd N/A 560 gpd Total 720.1 gpd *Reduction factors convert calculated flow into average daily flow over a year: 59/365,49/365 and 10/365 convert for days per year that certain employee and customer levels are anticipated.The 4/8 factor converts for a four-hour shift. Table 4. Weighted Average Concentration Calculation Use Average Daily Flow Estimated Waste Water Weighted Average Product Quality Employees 29.4 gpd 85 mg/L-N 2,499 gpd-mg/L-N (59 days per year) Customers,Wine Tasting Events 96.6 gpd 85 mg/L-N 8,211 gpd-mg/L-N (49 per year) Customers, Marketing Events 32.0 gpd 85 mg/L-N 2,720 gpd-mg/L-N (10 days per year) Parking Attendants 2.1 gpd 85 mg/L-N 178.5 gpd-mg/L-N (59 days per year) Residence 560 gpd 35 mg/L-N 19,600 gpd-mg/L-N Totals 720.1 gpd 33,208.5 gpd-mg/L-N Weighted Average 33,208.5 gpd-mg/L-N/ 720.1 gpd=46.1 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 (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 LOGE 1908 Page 12