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1Vlound Desi Worksheet <br /> A. Flow <br /> Estimated at 750 gallons per day(gpd) for a five bedroom dwellin�. <br /> B. Septic Tank Liquid Volumes <br /> # of septic tanks =2 capacity=each, 1500 gallons <br /> Lift station capacity= I500 �allons <br /> C. Soils (refer to soils log and percolation data sheets that follow) <br /> 1. Depth to restricting layer=23" <br /> 2. Depth of percolation tests = 12" <br /> 3. Texture of soils are Clay loam with a high perc rate of 53 minutes per inch. <br /> 4. Land slo =3 to 5% maY. <br /> D. Rock Layer Dimensions <br /> 1. Multiply flow rate by .83 to obtain required area of rock layer: A x 0.83 = <br /> 750 x .0.83 =630 scLuare feet <br /> 2. Rock bed width will be 10 feet <br /> 3. Length of rock layer is the square feet area/width= <br /> 630/ 10= 631ineal feet <br /> E. Rock Volume <br /> 1. Multiply the rock area by the rock depth to determine the cubic feet of rock: <br /> 630 x 1 =630 cubic feet <br /> 2. Divide the cubic feet by 27 cu. Feet to determine the cubic yards: <br /> 630/27= 24 cubic yards <br /> 3. Multiply the cubic yards by 1.4 to determine the weight of rock in tons: <br /> 24 x 1.4 =32 tons of clean washed a r ate rock. <br /> SO ON R'IDTH S T [E <br /> F. Absorption Width R�r� °.rr�.� PER ABSORPTiONR'IDTH <br /> IN�tPt Ff TO U1YER R'ID"i'H <br /> >A1 Caax Sad 1.20 1.00 <br /> 1. Percolation rate in the top 12"of soil is 46 mpi. 0.1�5 �'d '.p '.°° <br /> 0.1 to 5 Fmc Sand .060 2.00 <br /> Texture is clay loam. 6�„ �" °." '.sZ <br /> 1610 30 Loazn .0.60 2.0 <br /> 31 00 35 Silt Caim .0.50 2.J0 <br /> 36 m 60 CI Loam 0.35 2.67 <br /> 2. Select allowable soil loading rate from Table. �m Q�y o.�` 5.� <br /> �za <br /> 0.45 �allons per day per square foot of rock area. <»� �a� ��� �� <br /> 3. Calculate the absorption width ratio 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 />