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MOUND DESIGN WORKSHEET <br /> . • (For Flows up to 1200 gpd) . <br /> A. FLOW Estimated Sewage Flows in Gallons pa day I <br /> (8Pd) <br /> Estimated 6,00 gpd (see pages D-7 or I-3,4,5) Number } <br /> or measured - gpd x 1.5 = - of Type 1 Type II Type 111 Type <br /> Bedrooms IV <br /> 2 300 225 180 <br /> B. SEPTIC TANK LIQUID VOLUMES 3 450 300 218 <br /> 4 600 375 256 °I th, <br /> N, i 0 l <br /> 5 750 450 294 vae <br /> ,�cgallons (see pages C-3 or C-5) 6 900 525 332 1jww1. <br /> 7 1050 600 370 ITm <br /> 8 1200 67S 408 cottons <br /> C. SOILS (refer to site evaluation) <br /> 1. Depth to restricting layer= - inches Septic Tank Capacities,in galk.na <br /> Number of Minimum Liquid Liquid capacity with <br /> 2. Depth of percolation tests = 1 -) inches Bedrooms Capacity garbage disposal <br /> 3. Percolation rate /0 . TZ mpi 2 c Icu <br /> 750 1125 <br /> 7 or 4 1000 19M <br /> • 4. Land slope % 7.or <br /> a 9 z« 22503000 <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 = t <br /> A ) gpd x 0.83 sq. ft./gpd ='-f">`(,' sq. ft.-112),n- 54'`'' <br /> 2. Select width of rock layer (10 feet or less) = ft. <br /> 3. Length of rock layer = Area+Width = <br /> St-f') sq. ft. = 1 ) ft. = SS ft. Rock Bed <br /> 1J•J•J•J•J•J•J.J•J.J•J•J.J•J.J <br /> .1.1.1.1.1,1,1,•• 1.1.1.1.• <br /> 1J.J.J.J•J•J•J•J.J.J.J•J•J•J•J <br /> •1.1.. 1•'t•1.1.1.1.1.1.1.1.1• tdth S101L <br /> MJ.J.J.J.J.J.J.J�J.J.J.J.J.J.J <br /> *._: 1.1...1,1......... 1.1 ..,. I <br /> E. ROCK VOLUME •JJJ.JJJJgJJJ . JJJI <br /> I-- Length --� <br /> 1. Multiply rock area by rock depth to get cubic feet of rock; <br /> .5.1-1r1 sq. ft. x 1,o,, ft. = --')/-1 cu. ft. <br /> 2. Divide cu. ft. by 27 cu. ft./cu. yd. to get cubic yards; <br /> .c-'2L-1 cu. ft. -27= 1 cu. yd. • <br /> 3. Multiply cubic yards by 1.4 to get weight of rock in tons; <br /> 1 cu. yd. x 1.4 ton/cu. yd. = a', tons. <br /> • <br /> F. ADSORPTION WIDTH 0,`-r Luk)V-Y l <br /> Absorption Width Sizing Table <br /> 1. Percolation rate in top 12 inches of soil is l .. mpi <br /> Percolation Rate Gallons Ratio of <br /> 2. Select allowable soil loading rate from table on page E-; in Minutes per Soil Texture per day per Absorption width <br /> gpd/ft2 Inch(MPI) square foot to Rock Layer <br /> •L) <br /> Width <br /> 3. Calculate adsorption width ratio by dividing rock layer Faster than 0.1• Coarse Sand ---- <br /> 0.1 to 5 Sand 1.20 1.00 <br /> loading rate of 1.20 gpd/ft2 by allowable soil loading rate; 0.6 o 5s• Fine Sancho 0.60 2.00 <br /> 1.20 gpd/ft21 -,'-) <gpd/ft2= ) ,. (,• 1 to 30 <br /> 30 SiLoao m 0:0 2.4003 <br /> Check this value onape E-16. 46to60 Clay Loam 0.45 2.67 <br /> P O 60 to 120 Clay 0.24 5.00 <br /> 4. Multiply adsorption width ratio by rock layer width to get Sliwerthan Clay <br /> required adsorption width; <br /> a,C,(7x /b ft =: . .'") ft <br /> i <br />