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101 <br /> .� C. SEPTIC SYSTEM DESIGN/IMPACT MITIGATION <br /> The design of the septic system for the proposed Church is based upon the following factors of <br /> operation, longevity, and environmental protection. Beginning with the plumbing fixtures, it is <br /> imperative that low volume fixtures as specified in the Uniform Plumbing Code (UPC)be used <br /> throughout the project. <br /> SEPTIC TANK <br /> The design and performance of the septic tanks for the project are dependent upon the disposal <br /> surface area, surge storage, discharge rate and exit velocity. These parameters affect the sludge <br /> and scum volumes, and therefore, the nitrogen capacity of the tanks. Tanks with a greater <br /> surface area and shallower depth are preferred due to surge storage capacity. Waste inflow <br /> volume creates a smaller rise in water depth and a slower discharge rate and exit velocity. These <br /> surges of flow through the tank are dampened as surface area increases. This is especially <br /> important with a Church since surge protection and capacity will be important on Sundays. <br /> By using the calculated average daily flow volume of 1,857 for Phase I,the effective tank <br /> capacity is as follows: <br /> The pump-out interval should initially be 2 yrs. After two years, a determination can be made as <br /> to sludge and scum formation and wastewater flows to possibly extend this pump-out interval. <br /> Required septic tank capacity: 2.4(QAVE) x Peaking Factor(PF)=2.4(1,857) x 1.5 = <br /> 6,700 gal tank capacity needed. <br /> For Phase I, it is recommended that three-2,000 gallons tanks be used in series, each with two <br /> .. compartments. This capacity protects against the significant surge factor that will occur on <br /> Sundays. Tank length to width (L/W)ratio should be a minimum of 3. An example of the <br /> dimensions of each tank: 2,000 gal =266 ft3: 12ft L x 4ft W x 5.5ft D=264 ft3 <br /> It is anticipated that Phase II will have a separate septic tank and leachfield area. Required septic <br /> tank capacity: 2.4(507)x 1.5 =2,000 gal tank capacity needed. <br /> LEACHFIELDS <br /> The calculated leachfield areas are based upon County of San Joaquin Environmental Health <br /> .. Standards: —7 <br /> _ PHASE I: C�V <br /> Base Tank Capacity (BTC) +Average Daily Flow(ADF) x Soil Factor(SF)_ <br /> 2,000 gal BTC + 1,857 gal ADF x .200 SF = 800 lineal feet of leachline <br /> _ 8 - 100 foot sections of leachline pipe = 9,000 square foot leachfield <br /> In addition to the leachline,there should be one sump for every two leachlines for a total of four <br /> sumps. Trench depth should be 36-42 inches. Leachline pipe should be 15-20 inches below final <br /> 6 <br /> Nalfey Aq P4search <br />