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Table 5. Average Daily Flow Calculation \ <br /> Use Units Rate Subtotal Reductions * Average Daily <br /> (shift, etc.) Flow <br /> 1-P <br /> deliveries 6 5 gal/driver 30 gal (5/7)(3/12) 5.4 gpd <br /> 2-P staff 16 13 gal/employee 208 gal (6/7)(3/12) 44.6 gpd <br /> dePveries 6 5 gal/driver 30 gal (6/7)(3/12) 6.4 gpd <br /> 3-P staff 2 13 gaUemployee 26 gal 3/12 6.5 gpd <br /> 3-P <br /> deliveries 2 5 gal/driver 10 gal 3/12 2.5 gpd <br /> 4-P staff 2 13 gal/employee 26 gal 3/12 6.5 gpd <br /> 5-P staff 5 13 gal/employee 65 gal (5/7)(3/12) 11.6 gpd <br /> 1-N staff 17 13 gaUemployee 221 gal (5/7)(4.5/12) 59.2 gpd <br /> 1-N <br /> deliveries 2 5 gal/driver 10 gal (5/7)(4.5/12) 2.7 gpd <br /> 2-N staff 5 13 gal/employee 65 gal (5/7)(4.5/12) 17.4 gpd <br /> 2-N <br /> deliveries 1 5 gal/driver 5 gal (5/7)(4.5/12) 1.3 gpd <br /> 3-N staff 2 13 gal/employee 26 gal (5/7)(4.5112) 6.9 gpd <br /> 4-N staff 2 13 gal/employee 26 gal (517)(4.5/12) 6.9 gpd <br /> 1-S staff 10 13 gal/employee 130 gal (5/7)(4.5/12) 34.8 gpd <br /> 1-S <br /> deliveries 1 5 gal/driver 5 gal (5!7)(4.5/12) 1.3 gpd <br /> 2-S staff 5 13 gal/employee 65 gal (5/7)(4.5/12) 17.4 gpd <br /> Total 276.4 gpd <br /> Reduction factors convert calculated flow into average daily flow over a year. Reduction factor of 5/7 or W is days <br /> per week; 3/12 or 4.5/12 is months per year. Reduction factors need to Oe taken into account since staff are not <br /> present every day or every month. <br /> 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 waste water and release nitrogen gas (N2) to the <br /> atmosphere. Due to the biologic processes in the shallow soils, nitrogen in the drain <br /> LOGE 1123 Page 11 <br />