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' Soil Suitability&Nitrate Loading Study <br /> St. Patrick's Church, Escalon, CA Page 4 <br />{ Project No. 607.1 <br /> August 31, 2009 <br /> fE' <br /> Based on these records, it appears the septic systems in the nearby area have , <br /> operated consistently and with few repairs needed. <br /> 3.3 Existing and Proposed Septic System Usage <br /> r The proposed new septic system is expected to experience minimal use due to <br /> limited hours of use. The proposed chapel will have a seating capacity of about <br /> 30 persons. It will have two restrooms, each with two toilets. One of the toilets <br /> in the men's room will be a urinal. The San County Joaquin CSewage q y Standards <br /> (EHD, 2003) offers guidance for assumptions regarding septic flow rates. <br /> According to Table 6.1.15, the assumption is made that a church will produce 5 <br /> `± gallons per day for each seat. Using this assumption, the 30-seat chapel is <br /> calculated to produce 150 gallons-per-day (GPD) of raw sewage. - <br /> For residential septic systems, the assumption is made that each resident <br /> produces 70 gallons per day (GPD) of sewage. Permanent residences are <br /> Fi generally assumed to have 5 residents, yielding a sewage output of 350 GPD. In <br /> this case, the 2-bedroom house is occupied by the parish priest, and given the <br /> requirements of the Catholic faith, the house is unlikely to ever house as many j <br /> as five residents. The house estimate is therefore reduced to 200 GPD. <br /> Fi <br /> # i <br /> ki <br /> I <br /> ¢ 2937 Veneman Ave.,#B240 Geo-Phase Environmental Inc. Phone: (209) 569-0293 4 <br /> Modesto, CA 95356 Fax: (209) 569-0295 <br />