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Mound Desi Worksheet <br /> A. Flow <br /> Estimated at 450 gallons per day(gpd) for a three bedroom dwelling. <br /> B. Septic Tank Liquid Volumes <br /> # of septic tanks=2 capacity=each, 1000 allons use existing tanks if sealed <br /> Lift station capacity= 1000 al� lans if they are not, pump and backfill.) <br /> C. Soils (refer to soils log and percolation data sheets that follow) <br /> 1. Depth to restricting layer=26" <br /> 2. Depth of percolation tests= 12" <br /> 3. Texture of soils are Cla� with a percolation rate of 48 minutes per inch. <br /> 4. Land slo = 10 to 12%max. <br /> D. Rock Layer Dimensions <br /> 1. Multiply flow rate by .83 to obtain required area of rock layer: A x 0.83 = <br /> 450 x .0.83 =380 square feet <br /> 2. Rock bed width will be 10 feet <br /> 3. Length of rock layer is the square feet area./width= <br /> 380/10=381ineal feet <br /> E. Rock Volume <br /> 1. Multiply the rock area by the rock depth to determine the cubic feet of rock: <br /> 380 x 1 =380 cubic feet <br /> 2. Divide the cubic feet by 2'7 cu. Feet to determine the cubic yards: <br /> 3 80/27= 14.07 cubic yards <br /> 3. Multiply the cubic yards by 1.4 to determine the weight of rock in tons: <br /> 14.07 x 1.4=20 tons of clean washed a r ate rock <br /> � �t <br /> F. Abso tion Wid�l �� �II-� Grn ctn'no oF <br /> � xw'rE rEx'r�nte rEtt nasoRrrtox wIDrx <br /> IN MPI S Ff TO LAYER WIDTH <br /> >A1 Couree Saed 1.?A 1.00 <br /> 1. Percolation rate in the to 12"of soil is 48 m i. o.'�3 S'� I. 1.°° <br /> P P o.��s �,�� .� z.� <br /> Texture is clay loam. 6�15 S� �, 0.�9 l.sZ <br /> 16 to 30 Loam .0.60 2.0 <br /> 31 to 45 Silt Loam .0.30 2.40 <br /> 46 w 60 Iusm 0.45 2.67 <br /> 2. Select allowable soil loading rate from Table. �� �.� a.2< S.�o <br /> 0.45 gallons per day per square foot of rock area. <Zo� �� �� fi� <br /> 3. Calculate the absorption width ra.tio by dividing the rock layer loading rate of 1_2 <br /> gpd/ft2 by allowable soil loading rate: <br /> 1.2/0.45 =2.67 <br /> 4. Multiply the absorption width ratio by the rock layer width to determine the <br /> required absorption width; <br /> 2.67 x 10 =27 feet <br />