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• <br /> MOUND DESIGN WORKSHEET <br /> . • (For Flows up to 1200 gpd) • <br /> -,--1- A. FLOW Estimated Sewage Flows in Gallons per day <br /> Estimated Co 0 gpd (seepages D-7 or I-3,4,5) WOWO P g Fiumlxr y <br /> or measured gpd x 1.5 = - . Itedref Type I Type II ly7 <br /> pe III IV <br /> 13 450 300 218 eet <br /> LIQUID VOLUMES . 2 300 225 180 <br /> B. SEPTIC TANK <br /> 4 600 375 256 Dor <br /> D\ -1 o 0 0 gallons (see pages C-3 or C-5) 700s294 a u Iy <br /> 7 1050 600 370 n ' <br /> 1 1200 675 408 ammo <br /> C. SOILS (refer to site evaluation) <br /> 1. Depth to restricting layer = I � 0inches Sepik Took C.real.yapawn <br /> Y 'ID <br /> „ Numler or Minimum Llgail Liquid o•P•ciy with <br /> 2. Depth of percolation tests = / O. inches Itedr«mu C.mmb lark,daim l <br /> 3. Percolation rate • . r/ mpi 2«kn 750 1123 <br /> P s«4 1X) 13tn <br /> 4. Land slope 9 % 7';a, 152230 <br /> over 9 <br /> D. ROCK LAYER DIMENSIONS <br /> 1. Multiply flow rate by 0.83 to obtain required area of rock <br /> layer: Daily Flow x 0.83 = <br /> i-o e gpd x 0.83 sq. ft./gpd = L• - sq. f t.*':7 - 51'7 <br /> 2. Select width of rock layer (10 feet or less) = /o ft. <br /> • 3. Length of rock layer = Area+ Width = <br /> L--11 sq. ft. + /o ft. = 5",r ft. <br /> Rock Bed <br /> tir•r•r•r•r•r•r•r;.• r•r•r•r•r•r <br /> ••-5:1 •ti••.•ti•'ti• ••,r.y.y.b.ti.•..� <br /> r;'•'•r•r••• r:�•r•r•r•r•r;•• <br /> • ti ti ti411 1 . •..ti4.111:r•.hNidth S10tl <br /> 'rIr•r•r.r.r.r•f.r.r•r.r.r.r.r� <br /> E. ROCK VOLUME , r:r_f rr•r_ _gt.•_r"_'''''r'f' <br /> I---•- Length <br /> 1. Multiply rock area by rock depth to get cubic feet of rock; <br /> s'+1,sq. ft. x l.vs,ft. = .0,4 cu. ft. <br /> 2. Divide cu. ft.by 27 cu. ft./cu. yd. to get cubic yards; <br /> .co y cu. ft. +27= •:,-' ► cu. yd. <br /> 3. Multiply cubic yards by 1.4 to get weight of rock in tons; <br /> i cu. yd. x 1.4 ton/cu. yd. = tons. <br /> F. ADSORPTION WIDTH �,, '--�" ,, <br /> 1. Percolation rate in top 12 inches of soil is 'f..". .< mpi Absorption Width Sizing Table <br /> Percolation Rate Gallons Ratio of <br /> 2. Select allowable soil loading rate from table on page E-; <br /> inIncMih uMsPpcr Soil Texture speuaredaypAaonL wrr <br /> • `I ‘ gpd <br /> 3. Calculate adsorption width ratio by dividing rock layer Fa.tertluut0.1• coarse Sand <br /> 0.1 so S Sand 1.20 1.00 <br /> loading rate of 1.20 gpd/f t2 by allowable soil loading rate; 0.1 to 3•• Fine Sand•• 0.60 2.00 <br /> 1.20 d/f t2+ ;u ; 6 to 15 Sandy Loam 0.79 1.52 <br /> gP gpd/f t2= 7„ G.'7 , 16 to 30 Loam 0.60 • 2.110 <br /> 31 so 43 Silt Loom _0.50 2.40 <br /> Check this value on page:.E-16. '- 0) .cla Looaym o=5 , sA7 <br /> 4. Multiply adsorption width ratio by rock layer width to get sl zzuhan oar --- -..- <br /> required adsorption width; ' <br /> • to7 x 110 ft = ?(- t> ft <br /> . • <br />