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MOUND DESIGN WORKSHEET <br />(For Flows up to 1200 gpd) <br />A. FLOW <br />Estimated ' r, r) gpd (seepages D-7 or I-3, 4, 5) <br />or measured _ gpd x 1.5 = - <br />B. SEPTIC TANK LIQUID VOLUMES <br />a _ 0 gallons (see pages C-3 or r-5) <br />C. SOILS (refer to site evaluation) <br />1. Depth to restricting layer = _Z_ -t inches <br />2. Depth of percolation tests = inches <br />3. Percolation rate mpi <br />4. Land slope - % <br />D. ROCK LAYER DIMENSIONS <br />I. Multiply flow rate by 0.83 to obtain required area of rock <br />layer: Daily Flow x 0.83 = <br />y gpd x 0.83 sq. ft. / gpd =) y 2 sq. f t 4 : - <br />2. Select width of rock layer (10 feet or less) _ /% ft. <br />3. Length of rock layer = Area + Width = <br />`, a ► sq. ft. + I_ ft. = <K D _ ft. <br />E. ROCK VOLUME <br />1. Multiply rock area by rock depth to get cubic feet of rock; <br />?H-) sq. ft. xi � ft. cu. ft. <br />2. Divide cu. ft. by 27 cu. ft./cu. yd. to get cubic yards; <br />1.uLtj cu. ft. + 27 = Q -7_ 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. = y I tons. <br />F. ADSORPTION WIDTH CL_A" tv;+ - <br />1. Percolation rate in top 12 inches of soil is mpi <br />2. Select allowable soil loading rate from table on page E-; <br />I q, - 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+ .L-) 5 gpd <br />/ft2= <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 />2 -�x i ft = ft <br />Eatialmed Sewage Flows itr Gallons Per day <br />(gpd)of <br />n.e.. �.,] <br />Ty 1 <br />Type II <br />Type III <br />T�pe <br />Rock Bed <br />•t•I•I•/ hJ•I•IN.WP7•I•� I <br />dth S10 R. <br />•=- Length <br />Absorption Width Sizing Table <br />rwcoto iae ltare <br />in Min" M pa <br />Inch IMYI) <br />Sal Teature <br />lowktr» <br />per day per <br />urge (am <br />I Ratio of <br />Akaorpion rkkh <br />to Rock LAM <br />W11111h <br />F34W than 0.1 <br />corms Sand <br />0.1105 <br />Sand <br />1 "0 <br />1.00 <br />0.1 a S •• <br />Sand •• <br />0.60 <br />2.n0 <br />6.. IS <br />andFmc <br />Sy Loun <br />0.79 <br />1.52 <br />16 to .10 <br />Loom <br />0.60 <br />2.00 <br />31 to45 <br />Sill Loam <br />0.50 <br />2.40 <br />36 to 60 <br />Clay Loam <br />0.45 <br />2.67 <br />60 to 120 <br />Clay <br />0.24 <br />SAW <br />Slower than <br />Clay <br />----- <br />..... <br />120••• <br />