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Values and Assumptions: <br /> I= 23,296 Gals=total WW/yr=3,114 cu ft =0.954 in/yr <br /> 0.9 Ac x 43,560 sq ft/Ac x (1 ft/12 in) <br /> Nw=62 mg N/L <br /> d = Assume 30% <br /> R = 8.82 in/yr. <br /> Nb= Assumed to be 0.1 ppm NO3-N <br /> 0.954 in/yr(62 mg N/L) 0 -0.30)+(8.82 in/yr x 0.1 my/L) <br /> Nr = (0.954 in/yr+ 8.82 in/yr) <br /> Nr = 4.3 ppm as nitrate-nitrogen (NO3-N)or 19.2 ppm as nitrate (NO3) <br /> IV. ONSITE WASTEWATER TREATMENT SYSTEM <br /> OPERATIONAL PARAMETERS AND COMPONENTS <br /> SSS§3.7. The following is a description and applicable calculations of the wastewater <br /> management system structures and operations. <br /> A. SEPTIC TANK CALCULATIONS <br /> Septic tanks store the accumulated sludge, scum and effluent (clear zone) volumes, which in turn <br /> affect treatment of nitrogen within septic tanks. <br /> Detention Time Calculation: <br /> Detention Time= 1,600 gal proposed tank capacity x 0.70(30%volume lost to sludge/scum accumulation) <br /> 1.5 (Peaking factor)x 64 gals/day(calculated ADF) <br /> Detention Time= 11.7 days. The minimum acceptable detention time is 1.0 days. Therefore, a proposed <br /> tank size of 1,600 gallons is adequate for sufficient hydraulic residence time(HRT). <br /> B. ONSITE WASTEWATER TREATMENT SYSTEM <br /> The configuration of the effluent disposal structure will be as three leachlines,with sumps at the ends of <br /> each leachline. A four-hole distribution box will ensure equal now to each leachline: <br /> 1 1,200 gallon Base Tank Capacity(BTC)+Average Daily Flow(ADF)= 1,200+64 gpd= 1,264 gals. <br /> 1,264 gals x 0.200(sandy loam soil factor)=253 lineal ft of leachline(LFLL). 253 ft x 4 sf/ft LL= <br /> 1,011 sf of Application Area required: <br /> 3 -40 ft LL= 120 ft LFLL x 4 sf/ft LL=480 sf of Application Area from leachlines. <br /> Sumps(2 ft W x 10 ft D)=308 sf Application Area/Sump x 3 sumps=924 sf of Application Area from <br /> Sumps. <br /> 7 <br /> Chesney Consulting <br />