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MOUND DESIGN WORKSHEET <br /> • (For Flows up to 1200 gpd) <br /> i A. FLOW <br /> • Hstitnatc:d Sewage Plows in Calkins fax day <br /> Estimated SSD gpd (see pages D-7 or I-3,4,5) (WO <br /> NUM her <br /> or measured gpd x 15 = of lypc I Type H lypc HI T pe <br /> Bedrooms <br /> iv <br /> B. SEPTIC TANK LIQUID VOLUMES 3 4550 225 a 6" <br /> tQ �s a gallons (see pages C-3 or C-5) s Iso :s7o <br /> G 400 525 332 .u t. <br /> 7 1050 GW 370 !v <br /> C. SOILS (refer to site evaluation) g 110 675 4og �, - <br /> 1. Depth to restricting Iayer = lir inches Septic Tank Cayuuieer,la salaam <br /> 2. Depth of percolation tests = J2 inches NImheur. <br /> nnosf Minimum;l.iqud lqud,aes,phceiyawiai <br /> ty <br /> 3. Percolation rate /Y mpi 2or:ss w 1125 <br /> 15110 <br /> 4. Land slope 2.-1 °/Q 4er6 tsa► zoo <br /> 7.110E9 20003000 <br /> aver 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 /,5"- <br /> .f....512____ <br /> ,S <br /> gpd x sq. ft./gpd =6/„,c-sq. ft. <br /> 2. Select width of rock layer (10 feet or less) = /© ft. <br /> 3. Length of rock layer = Area =Width = <br /> 6 75 sq. ft. /0 ft. = hi S-ft. Rock Bed <br /> Lam• •;• :-.0:- <br /> -.- E. ROCK VOLUME '�~'1 �• "• <br /> .•Length •• <br /> 1. Multiply rock area by rock depth to get cubic feet of rock; <br /> 1 <br /> 7s sq. ft. x / ft.=475 cu. ft. <br /> 2. Divide cu. ft. by 27 cu. ft./cu. yd. to get cubic yards; <br /> 4 7.5" cu. ft. i 27= 426- cu. yd. <br /> 3. Multiply cubic yards by 1.4 to get weight of rock in tons; <br /> d 5- cu. yd. x 1.4 ton/cu. yd. =3 S tons. <br /> F. ADSORPTION WIDTH <br /> 1. Percolation rate in top 12 inches of soil is 1 '1 mpi Absorption Width$izinK'1'.tblc <br /> 2. Select allowable soil loading rate from table on page E-; Percolation Rale Gal Ions Ratio of <br /> 9 gpd/ft2 in Minutes ler Soil Texture pa day per Absorption with <br /> gPd/ft2 Inch MN) square foot to Rock layer <br /> 3. Calculate adsorption width ratio by dividing rock Iayer I�aaterthana.I • Coarse Sand - waNn <br /> loading rate of 1.20 gpd/ft2 by allowable soil loading rate; 0 l io to P S .. 1.20- <br /> loading <br /> 0 2.00 <br /> 1.20 gpd/ft2 .19 gpd/ft2= 1.S2- 6to 15 SandyLnatn 0.79 1.52 <br /> 16 to 30 Loan, - 2.00 <br /> 31 atCheck this value on page E-16. 6406 tow 1I Clay LoamLon n is �7 <br /> 4. Multiply adsorption width ratio by rock layer width toget � a Clay <br /> s tomo <br /> required adsorption width; �� <br /> J•SZ x /o ft=15:2. ft <br />