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' <br /> 11/26/2002 Page 1 <br /> ' <br /> ' INDIVIDUAL SEWAGE TREq;TMENT SYSTEM WORKSHEET FOR A PRESSURIZED BED <br /> A. Number of Bedrooms = 2 <br /> Estimated gpd = 300 gallon <br /> ' B. SEPTIC TANK LIQUiD VOLUME 1500 gallon capacity <br /> C. SOILS (refer to site evaluation) _ <br /> ' 1. Depth to restricting layer= 5_5 feet <br /> 2. Maximum depth of system `(C1-3� �.5 f�et <br /> 3. Percolation rate = 30 � <br /> ' 4. Soil Sizing Factor = 2.20 sq.ft./gpd <br /> 5. Land slope = 0 % <br /> ' D. CALCULATE REQUIRED DRAINFIELD AREA <br /> 1. Soil Sizing Factor x Gallons Per C 660 square feet of drainfleld area <br /> ' E. CALCULATE BED DIMENSIONS <br /> 1. Length of Bed = 60 feet <br /> ' 2. Width of Bed = 11 feet <br /> F. CALCULATE ROCK VOLUME <br /> ' (Rock depth below the distribution pipe plus 0.5 ft)times bottom area: <br /> 660 square feet x _( 0.5ft 0.5 ft ) = 660 cubic feet <br /> _ Volume in cu. ft. divided by 27 gives volume in cu. yd. = 24 cubic yards : <br /> Volume in cu. yd. times 1.4 = tons = 34 tons <br /> ' <br /> -Absorption Width Sizinq <br /> ' Perc rate Soil Sq.ft. per Gallons per <br /> mQi Texture PD Da / .Ft. <br /> <0.1 Coarse San <br /> ' 0.1 to 5 Sand 0.83 1.20 <br /> 0.1 to 5 Fine Sand 1.67 0.60 <br /> 6 to 15 Sandy Loan 1.27 0.79 <br /> ' 16 to 30 Loam 1.67 0.60 <br /> 31 to 45 S i It Loam 2.00 0.50 <br /> 46 to 60 Clay Loam 2.20 0.45 <br /> ' <br /> ' <br /> ' . <br /> ' <br /> 1 <br />