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ratubes:4" PVC pipe extending to soil/effluent interface with 4" riser extending above the grass <br /> east 0.5 foot,with a screw type cap. Both soil sampling tubes must be placed in proximity to <br /> e. <br /> D. SEPTIC SYSTEM OPERATIONALPARAMETERS AND COMPONENTS - <br /> WEST LEACHFIELD (W.L.F.) AREA TO SERVE EXISTING OFFICE TRAILERS <br /> SSS§3.7 The pressurized filter bed system for the Office Trailers will be comparable to the filter bed <br /> disposal area for the new Office Building. An overview of the septic system operation is as follows: Influent <br /> wastes from both Office Trailers will gravity into a dual compartment 2,000 gallon septic tank. The second <br /> compartment will be the pump chamber with a duplex pump system within a Biotube filter vault to <br /> pressurize the single filter bed. <br /> W.L.F. SEPTIC TANK <br /> The following calculations demonstrate septic tank capacity as was calculated for the E.L.F. above with a <br /> pump-out interval of one year. <br /> Septic Tank Capacity Based on Pumn-out Interval of One Year: <br /> Recommended tank capacity for a potential pump-out interval of one year after complete build-out: <br /> 1.6(pump-out interval factor)(QAIE)x Peaking Factor(PF=2.5)= 1.6(150 gaWday)x 2.5 =600 gals. <br /> Total septic tank capacity= one -2,000 gallon tanks. <br /> Detention Time: <br /> Detention Time=2,000 gal total tank capacity x 0.70(30%volume lost to sludge/scum accumulation) <br /> 2.5 (Peaking factor)x 150 gals/day(ADF) <br /> Detention Time=3.7 days. The minimum acceptable detention time is 1.0 day. <br /> Caution must be given to the buoyancy potential all of the tanks, due to the potentially high groundwater <br /> table. Contents of the tank should never be entirely pumped out. <br /> W.L.F.PRESSURIZED FILTER BED SIZING CALCULATIONS <br /> Base Tank Capacity= 1,200 gal. ADF= 150 gpd <br /> Leachline Equivalent Requirement= 1,200 gallons BTC+ 150 ADF x 0.225 Silt Soil Factor(SF)=304 <br /> lineal feet of leachline(LFLL). 304 x 3 (Sandy Silt Soil -Filter Bed Soil Factor)_ <br /> 911 sq.ft. filter bed area required. <br /> Proposed Filter Bed Area(Single Bed Only)=91 ft N-S long x 10 feet E-W wide = <br /> 910 sq.ft to be installed: <br /> 100% Reserve Replacement Area: This area is denoted on the Site Plans and is situated directly to west of <br /> the primary disposal field. <br /> 19 <br /> Chesney Consulting <br />