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FFbased <br /> TIC SYSTEM DESIGN /IMPACT MITIGATION <br /> tic system design to serve the existing Church and the proposed addition will be <br /> etermined by the San Joaquin County Environmental Health Department and will be <br /> operation, longevity, and environmental protection. All plumbing fixtures must be <br /> low volume fixtures as specified in the Uniform Plumbing Code (UPC),to be used where <br /> applicable. <br /> SEPTIC TANK <br /> The design and performance of the septic tank for the project is dependent upon the disposal <br /> surface area, surge storage, and discharge rate. These parameters affect the sludge and scum <br /> volumes, and therefore, the nitrogen capacity of the tanks. Tanks with a greater surface area and <br /> shallower depth are preferred due to surge storage capacity. However, since a filter bed is <br /> proposed, the effluent must be pumped from a filter vault through the piping network. Surge <br /> capacity is especially important with a Church since surge protection and capacity will be <br /> important on Sundays. <br /> Typically,the volumetric capacity of septic tanks serving commercial facilities should be equal <br /> to approximately five times the average daily flow(ADF or QAvE). The peaking value is <br /> normally taken to be 1.5 for commercial projects: <br /> SEPTIC TANK CAPACITY EXAMPLE: <br /> Recommended tank capacity for a 3 yr pump-out interval: 2.8(QAvE)x Peaking Factor(PF) _ <br /> 2.8(126 gals/day) x 1.5 = 530 gal tank capacity required: Therefore, use minimum tank size of <br /> 1,200 gallon tanks with a filter vault and dual pumps in the last chamber. <br /> DETENTION TIME EXAMPLE: <br /> Detention Time= 1,200 gal tank capacity x 0.70 (30% volume lost to sludge/scum accumulation) <br /> 1.5 (Peaking factor) x 126 gals/day <br /> Detention Time=4.4 days. The minimum acceptable detention time is 24 hrs. <br /> LEACHLINE /FILTER BED REQUIREMENTS <br /> The calculated lineal feet of leachfield and subsequent filter bed area are based upon San Joaquin <br /> County Environmental Health Sewage Standards § 8.7: <br /> Base Tank Capac C)+Average Daily Flow(ADF)x Soil Factor(SF) _ <br /> 1,200 gal BTC gal ADF x 0.200 (sandy loam) SF =265 lineal feet of leachline <br /> Filter Bed Area=265 lineal feet of leachline x 3 (sandy soils)=795 sq ft of filter bed required. <br /> Page -6- <br /> va&l f Ag Research <br />