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Systems Standards which incorporate peak and surge flow factors. The estimates used in the On-Site Wastewater Treatment Systems Standards may be greater than those discussed here. The nitrate as nitrogen (N) concentration of the employee use is estimated to b�e 85mg/L (US EPA, 1980). _ c1 The maximum average daily flow for the Site was estimated to be 1,480 gallons per day ha Q� (gpd), as calculated in the following table: tJ Table 3. Average Daily Flow Calculation Use Units Rate Subtotal Conversions Average Daily Flow Warehouse 7 13 gal/employee 91 gpd 10/8, 6/7, 48.8 gpd Supervisors 6/12 Packing 5 13 gal/employee 65 gpd 9/8, 6/7, 6/12 31.3 gpd Supervisors Line Crew 174 13 gal/employee 2,262 gpd 6/7, 6/12 969.4 gpd Administration, 5 14 gal/shower 70 gpd 6/7 60 gpd showers taken Administration, 20 13 gal/employee 260 gpd 6/7 222.8 gpd Employees Maintenance 6 13 gal/employee 78 gpd 6/7 66.8 gpd Sanitation 8 13 gal/employee 104 gpd 6/7, 6/12 44.6 gpd Cooling 5 13 gal/employee 65 gpd 10.5/8, 6/7, 36.6 gpd 6/12 Total 1,480.3 gpd Reduction factors convert calculated flow into average daily flow over a year: 10/8, 9/8, and 10.5/8 convert for 10-hour,9-hour, and 10.5-hour workdays;6/7 converts for days of operation per week; and 6/12 converts for months of operation per year. 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 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 tend to denitrify at a lower rate of about 10 percent. LOGE 1846 Page 10