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MOUND DESIGN WORKSHEET <br />(For Flows up to 1200 gpd) <br />A. FLOW <br />Estimated moo_ gpd (see pages D-7 or I-3, 4, 5) <br />or measured -- gpd x 1.5 = <br />B. SEPTIC TANK LIQUID VOLUMES <br />a, - / 0o 0 gallons (see pages C-3 or C-5) <br />C. SOILS (refer to site evaluation) <br />1. Depth to restricting layer = `�-� i inches <br />2. Depth of percolation tests = I inches <br />3. Percolation rate 1 1 ., mpi <br />4. Land slope H % c 11 <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 />C gpd x 0.83 sq. ft. / gpd = yci v. sq. f t. l 1 <br />2. Select width of rock layer (10 feet or less) = 1 ft. <br />3. Length of rock layer = Area + Width = <br />�, 4'? sq. ft. + 10 ft. = S 5' ft. <br />E. ROCK VOLUME <br />1. Multiply rock area by rock depth to get cubic feet of rock; <br />sq. ft. x 1. i ft. = -0 Ll cu. ft. <br />2. Divide cu. ft. by 27 cu. ft./cu. yd. to get cubic yards; <br />9n,4 cu. ft. + 27 = �, I 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. = 3tj- tons. <br />F. ADSORPTION WIDTH LL4Y' LG►a yv1 <br />1. Percolation rate in top 12 inches of soil is 11,3 mpi <br />2. Select allowable soil load' n� rate from table on page E-; <br />gpd / f t2 <br />3. Calculate adsorption width ratio by dividing rock layer <br />loading rate of 1.20 gpd/ft2 by allowable soil loading rate; <br />1.20gpd/ ft2+gpd /ft2= . <br />Check this value olt page E-16. <br />4. Multiply adsorption width ratio by rock layer width to get <br />required adsorption width; <br />,;;.L7x) 0 ft=;.b?ft <br />Estimated Sewase Mwa in Ga'iuna per day <br />(tom <br />lliwnbcr <br />of <br />Type 1 <br />Type II <br />Type III <br />Type <br />Iledrooms <br />I V <br />2 <br />300 <br />225 <br />ISO <br />3 <br />450 <br />3W <br />218 <br />aoa <br />4 <br />600 <br />375 <br />256 <br />• <br />5 1 <br />750 <br />450 <br />294 <br />M <br />6 1900 <br />525 <br />332 <br />Tr L <br />7 <br />I050 <br />600 <br />370 <br />m <br />S <br />1200 <br />673 <br />408 <br />..Iona <br />Scr4k Took Clpm it&M 1a 8.0-6 <br />YaaYar o2 <br />M.nnws Lprd <br />l.yud c.p.c ey uaa <br />Ikiaan. <br />cw-wy <br />w640 daV064 <br />2 a ka <br />730 <br />1123 <br />) w 4 <br />1010 <br />Ism <br />4 w 4 <br />1 SW <br />2230 <br />7.8 at 9 <br />Me <br />X100 <br />Rock Bed <br />dth MOM <br />1--- Length <br />Absorylion Width SkInglbbk <br />Parwok n Rate <br />in Minute. per <br />Inch (Mpl) <br />Soil Textwo <br />Cali" <br />per day per <br />+Ware fat <br />Ratio of <br />Abaorpion -ithh <br />in Rock Dyer <br />Width <br />Fa•ta ow 0.1 • <br />corm St.d <br />-. <br />0.1105 <br />Saad <br />1.20 <br />1.00 <br />0,to S - <br />Fine Sand • • <br />060 <br />1W <br />6 to 15 <br />Sandy lam <br />0.79 <br />1.37 <br />16 to 30 <br />tam <br />0.60 <br />2.t10 <br />311043 <br />SIN Law" <br />0.30 <br />2.41) <br />:6 w 60 <br />CI.111At4to_ <br />L0.4S_ <br />2.67 <br />60 to 120 <br />Clay <br />0.24 <br />5.00 <br />Slowv than <br />Clay <br />•.... <br />1?0••• <br />