Laserfiche WebLink
t-19 <br /> MOUND DESIGN WORKSHEET <br /> (For Flows up to 1200 gpd) <br /> A. FLOW D-7 <br /> Estimated r0 gpd (see pages D-7 or 1-3,4,5) 0716"7m 9CIArac Rows IN GSLL043 oA7 <br /> mumm ISP[or Onlo6NC2• <br /> or measured gpd. KOOMFOOM I a II = <br /> = 300 a9 1p .Cs <br /> 3 190 300 =1• .f <br /> 200 379 aun <br /> B. SEPTIC TANK LIQUID VOLUMES ;o ;; na I <br /> 7 <br /> 1090 X00 370 <br /> 2vIv0 gallons (see pages C-3 or C-5) I=00 6n �« �•. <br /> C-3 <br /> C. SOILS (refer to site evaluation) p SEPTIC TANK CAPACITIES, IN GALLONS <br /> LgNO CA-ACM <br /> 1. Depth to restricting layer inches 'M"1 OA"°A= <br /> SMILAX" LIMM CMAC" INSrOSAL <br /> 2. Depth of percolation tests = 17— inches t OR 1.111,11 766 1176 <br /> 3. Percolation rate mpi 1011' 1090 16.. <br /> 6006 1000 2260 <br /> 4. Land slope % <br /> 1...011. 0000 7100 <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 /> 46"U gpd x 0.83 sq. ft./gpd = .573sq. ft. <br /> 2. Select width of rock layer (10 feet or less) _ /d ft. <br /> 3. Length of rock layer = area+width = <br /> 3 7 3 sq. ft.+ _Lb ft. = 3 7 ft. Rock Bed <br /> j•j.j.j.r r j•j•j j r•j• .j j <br /> 1', <br /> tdth 510 <br /> E. ROCK VOLUME j'r•j•r•j•j•j•j r•jM•j•j•j•j <br /> �-- Length <br /> 1. Multiply rock area by rock depth to get cubic feet of rock; <br /> A 7jsq. ft. x / ft. = 3 73cu. ft. <br /> 2. Divide cu. ft. by 27 cu. ft./cu. yd. to get cubic yards; <br /> �3 cu. ft. +27=14 cu. yd. <br /> 3. Multiply cubic yards by 1.4 to get weight of rock in tons; . . <br /> cu. yd. x 1.4 ton/cu. yd. = LU tons. <br /> F. ADSORPTION WIDTH <br /> 1. Percolation rate in top 12 inches of soil is Z49 mpi E-16 <br /> 2. Select allowable soil loading rate from table on page E-16; AUMOALA L"CING MM CWULSY.0N=..N <br /> (.O gpd/ft2 W."�. <br /> N• O.Y r....1.M• <br /> 3. Calculate adsorption width ratio by dividing rock layer <br /> ..1. • Lae f.N ..N LN <br /> loading rate of 1.20 gpd/ft2 by allowable soil loading rate; <br /> 1.20 gpd/ft2+ �bo gpd/ft2= 2 .0 y <br /> .. •.. .... 6.72 I.N f..7 <br /> .1 •Ife e.f. .a6 ..N ..N <br /> Check this value on page E-16. <br /> 4. Multiply adsorption width ratio by rock layer width to get <br /> required adsorption width; <br /> _fix 2 ft = 240ft <br /> i <br /> i <br />