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The nitrate concentration of rainfall was estimated to be mg/L-N ( ntzsche and <br /> Finnemore, 1992). <br /> Quantity and Quality of Domestic Wastewater <br /> The estimated sewage flow rates for various uses are available from a number of <br /> references. The uses presented below were guided by the San Joaquin County On-Site <br /> Wastewater Disposal Standards (2003), Crites and Tchobanoglous (1998), and EPA <br /> (1980). The Wastewater Disposal Standards indicate 5 gallons per seat is the typical <br /> flow for a church with no kitchen. We understand that no food will be prepared on-Site. <br /> Crites and Tchobanoglous indicate 3 gallons per seat is the typical use for an assembly <br /> l hall. Five gallons per day per seat is a commonly used factor and was selected for this <br /> project. <br /> The estimated flow values discussed here should not be used for the design and sizing <br /> of the septic system. The design and sizing of the septic system should utilize the San <br /> Joaquin County Environmental Health Sewage Standards which incorporate peak and <br /> surge flow factors. The estimates used in the Sewage Standards may be greater than <br /> those discussed here. <br /> The church will operate year round. A maximum of 50 parishioners, clergy, and <br /> employee members are anticipated each Saturday No other uses are planned for the <br /> site. The Church will be closed on all other days. The nitrate as nitrogen (N) <br /> concentration of these uses is estimated to be 85-mg/L (Crites and Tchobanoglous, <br /> 1998). <br /> Please see the following tables that present the information in a tabular form. <br /> Table 4. Average Daily Flow Calculation <br /> Use Units Rate Subtotal Reduction Average Daily <br /> Flow <br /> Parishioners 50 5 gal/cust 250 gpd 1/7 35.7 gallons per <br /> day <br /> Reduction factors convert calculated flow into average daily flow over a period of a seven day week. This needs to <br /> be taken into account since the church will only operate one day per week. <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 (NZ) to the <br /> LOGE0914 Page 10 <br />