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MOUND DESIGN WORKSHEET <br /> (For Flows up to 1200 gpd) <br /> A. FLOW D-7 <br /> Estimated e/(,,,"'" 0 gpd (see pages D-7 or I-3,4,5) . 071164720 SSE ROWS IN 011U-12«5 PCP OAT <br /> N MNIER TVP!OF RE310ENCE a <br /> O <br /> or measured gpd. BEDRCOAIS I n =3 s <br /> 2 300 ns 1p 403. <br /> 3 450 300 2111 01 <br /> • 000 375 256 "IIn <br /> '"B. SEPTIC TANK LIQUID VOLUMES 0 ;n :45 it_, <br /> 71050 000 370 1 <br /> ' <br /> -/or gallons (see pages C-3 or C-5) e 1=00 675 404 Column. <br /> C-3 <br /> C. SOILS (refer to site evaluation) <br /> SEPTIC TANK CAPACITIES, IN GALLONS <br /> 1. Depth to restricting layer = ,` l inches N12_AOF wawa '0CAPACITY <br /> //.y, 1161746:0111111130U10 C414077 015005.1. <br /> ` <br /> 2. Depth of percolation tests = inches ,tl11e,e 766 „25 <br /> 3. Percolation rate © mpi <br /> • 2O"• 1040 1140 <br /> 10114 1100 224E <br /> 4. Land slope % <br /> 7,4,all 1 2430 2400 <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 /> E=-'7 gpd x 0.83 sq. ft./gpd =-. '='-'sq. ft. <br /> 2. Select width of rock layer (10 feet or less) = /0 ft. <br /> 3. Length of rock layer = area÷width= <br /> -5-c)C' sq. ft.+ i' ft. = --C-0 ft. Rock Bed <br /> f.f•f•f•f•f.f.r.f.f.•f.%•f.%•f.f.f1T <br /> 1.f•f•f•f•fti.f.f•f.t. f•f•f.f Sti <br /> ..0.0. ti•ti•.e.0. ti•ti•ti•ti.1•ti•ti• Nidth 510 <br /> f•f•f•f•f•f•f•f•f•f•f•f•f.f.fi <br /> ftiftiftifftif 1,f1fti:f*ftif4141:1 <br /> E. ROCK VOLUME F-- Length -----1 <br /> 1. Multiply rock area by rock depth to get cubic feet of rock; <br /> 370(.!, sq. ft. x i ft. t.6' cu. ft. <br /> 2. Divide cu. ft. by 27 cu. ft./cu. yd. to get cubic yards; <br /> Si.Der,cu. ft. + 27 =.' 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. =Z(c., tons. <br /> F. ADSORPTION WIDTH <br /> 1. Percolation rate in top 12 inches of soil is 4o mpi E-16 <br /> 2. Select allowable soil loading rate from table on page E-16; Ate.•65•L04,04•e14.40e1OF4o.S�.04llWOU•os <br /> ' iti o gpd/f t2 P.a.... A4..•N.14•.,•w <br /> ..r .• .108 <br /> 3. Calculate adsorption width ratio by dividing rock layer �"" 00 .r <br /> 1.1 4 1.20 1.41 1.00 1.00 <br /> 1 <br /> loading rate of 1.20 gpd/ft2 by allowable soil loading rate; 4 50 0.115.01 <br /> 1.51 <br /> 4 50 0.10 0.04 5.•1 2.00 <br /> 6,6 1144 0.50 0.40 0.03 1..0 <br /> 1.20 gpd/ft21 1 r Ggpd/ft2 = a .4 .1 40 0.64 0.70 1.13 1.1, <br /> 41 110 0,74 0.14 4.10 1.00 <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 /> /(.0 x214 ft = 24 ft <br />