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MOUND DESIGN WORKSHEET <br /> (For Flows up to 1200 gpd) <br /> A. FLOW Estimated Sewage Flow in Gallons per Day(gpd) <br /> Estimated I gpd Number <br /> or measured - x 1.5 = gpd. Bedrooms Type Ie II Type III Type Iv <br /> 2 300 225 180 Eos <br /> 3 450 300 218 of <br /> B. SEPTIC TANK LIQUID VOLUMES 4 600 375 256 <br /> 5 750 450 294 ;e <br /> l-la_S() c� /0 0 6 gallons 6 900 525 332 the <br /> 7 1050 600 370 <br /> 8 1 1200 1 675 1 408 <br /> C. SOILS(refer to site evaluation) II - <br /> 1. Depth to restricting layer = a inches sem o� I =mo`umber �� <br /> 2. Depth of percolation tests = i d inches v� `$"-) <br /> 3. Percolation rate C1. mpi 23or4` 17000 1.5 o <br /> 4. Land slope 5 % 7 or s 2,00000 <br /> over 9 See 6g.C-6 (z 1S) <br /> D. ROCK LAYER DIMENSIONS <br /> 1. Multiply flow rate by 0.83 to obtain required area of rock <br /> layer.A x 0.83 = <br /> 5o gpd x 0.83 sq. ft./gpd = sq. ft.-+td�),=WN <br /> 2. Select width of rock layer(10 feet or less) _ /0 ft. <br /> 3. Length of rock layer= area_width= Rock Bed <br /> [,,,qL4 sq. ft. lo ft. =L.�yl ft. ,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,., <br /> J•r•J•J•r•J•r•J•r r•r•r•r•J•J•J• <br /> r•J•r•r•r•J•r•r•r J•r•J•J•J•J•r• tdth 510 ft. <br /> •r•r•J•r•J•J•r•J•r•r•J•J•r•r•r•r• <br /> E. ROCK VOLUME �- Length <br /> 1. Multiply rock area by rock depth to get cubic feet of rock; <br /> LtLL sq.ft.x x:S ft. = /))� cu. ft. <br /> 2. Divide cu.ft.by 27 cu. ft./cu. yd. to get cubic yards; <br /> cu.ft. 27= �-) cu. yd. <br /> 3. Multiply cubic yards by 1.4 to get weight of rock in tons; <br /> a11 cu. yd.x 1.4 ton/cu. yd. _ tons. <br /> F. ADSORPTION WIDTH L A Ii t r►�, <br /> Absorption Width SizingTable <br /> 1. Percolation rate in top 12 inches of soil is mpi Percolation Raw � „ , <br /> Minus pR inch Soil Texture p,d y bod <br /> Wias .beoam <br /> 2. Select allowable soil loading rate from table; Faster than 0.1 Coarse-Sand 1.20 1.00 <br /> gpd/ft'- 0.1 toy Sand 120 1.00 <br /> 0.1 to 5 Fine Sand- 0.60 2.00 <br /> 6 to 15 Sandy Loam 0.79 1.52 <br /> 3. Calculate adsorption width ratio by dividing rock layer 16 to 30 Loam o.60 2.00 <br /> g 31 to 45 Silt Loam 050 2.40 <br /> loading rate of 1.20 gpd/ft2 by allowable soil loading rate; 46 to 60 Clay Loam 0.45 2.67 <br /> 1.20 gpd/ft2,- r 4 S gpd/ft2 = .(�� Slower than 120 Clav 024 5.00 <br /> "Soil having.309E or more of fine or very fine sand- <br /> 4. <br /> and4. Multiply adsorption width ratio by rock layer width to get <br /> required adsorption width; <br /> ;),L7 x /0 ft = atom. ft <br />