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The nitrate concentration of rainfall was estimated to be 1 mg/L-N(Hantzsche and Finnemore, 1992). -=' Quantity and Quality of Domestic Wastewater According to Shannon Rose of Inderjit S. Toor Construction, Inc., two duplexes are located on the Site. One of these comprises a one-bedroom unit and a two-bedroom unit. The other comprises two one-bedroom units. We estimate a maximum use of 120 gallons per day per bedroom for residential use. A typical residential concentration-of 45 mg/L of nitrate as N is selected (Crites and Tchobanoglous, 1998). The estimated flow values discussed here should not be used for the design and sizing of the septic system. The design and sizing of the septic system should utilize the San Joaquin County Environmental Health Department's On-Site Wastewater Disposal Standards which incorporate peak and surge flow factors. The estimates used in the On-Site Wastewater Disposal Standards may be greater than those discussed here. The maximum average daily flow for the Site was estimated to be 600 gallons per day (gpd). Please see the following table. Table 4. Average Daily Flow Calculation Use Units Rate Average Daily Flow Existing Unit 1-A 1 bed 120 gal/BR/day 120 gallons per day room Existing Unit 1-13 2 bed 120 gal/BR/day 240 gallons per day rooms 1 bed 120 gal/BR/day 120 gallons per day Existing Unit 2-A room Existing Unit 2-13 1 bed 120 gal/BR/day 120 gallons per day room Total 600 gallons per day Denitrification Reductions Denitrification is a process that occurs in the septic system drain field whereby certain bacteria oxidize the nitrate (NO3) in the waste water 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 LOGE 1515 Page 10