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Mound Desi n 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 al� lons <br /> Lift station capacity = 1500 gallons <br /> C. Soils (refer to soils log and percolation data sheets that follow) <br /> l. Depth to restricting layer=22" <br /> 2. Depth of percolation tests= 12" <br /> 3. Texture of soils are Clav loam with a high perc rate of 53 minutes rpe inch• <br /> 4. Land slo e= 3 to 6% 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 /> 750 x .0.83 =630 sauare 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 re ate rock. <br /> ABS RP'L'ION W S G T LE <br /> F. Absop�tion Width �R` s°a. GPD R"'�`°°F <br /> •r RAI'E TEXTURE PF.R ABSORP'I'(ON W[DTH <br /> IN MPI S FC TO LAYER WIDTH <br /> >At Cov�eSand 110 l.W <br /> 1. Percolation rate in the top 12" of soil is 46 mpi. °'w 5 S'"° '.Z° '.°° <br /> 0.1 to 5 Fine Sand .060 2.00 <br /> Texture is clay loam. ��015 S Imm 0.79 1.52 <br /> 16 to 30 Loazn .0.60 2.0 <br /> 31 to 45 Silt I.oam .0.50 2.40 <br /> 46[0 60 Cla Loam 0.45 2.67 <br /> 2. Select allowable soil loading rate from Table. ��o ��,y �.Z4 5.� <br /> ,z�, <br /> 0.45 gallons per day per square foot of rock area. <»� ���� ��� F�, <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 />