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MOUND DESIGN WORKSHEET <br />(For Flows up to 1200 gpd) <br />A. FLOW <br />Estimated ( G u gpd <br />or measured -- x 1.5 = - gpd. <br />B. SEPTIC TANK LIQUID VOLUMES <br />_ j o gallons <br />C. SOILS (refer to site eva;uation) u SC. <br />1. Depth to restricting layer = t q -� o = 2 i aches <br />2. Depth of percolation tests = I '' inches <br />3. Percolation rate I I . '7 mpi <br />4. Land slope - J % <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 />IV Do gpd x 0.83 sq. ft. /gpd = 'j� sq. ft. <br />2. Select width of rock layer (10 feet or less) _ L U ft. <br />E. <br />Eawased SINK flow in Gallons per My QPQ <br />Number <br />of <br />Type I <br />Type 11 <br />Type tit <br />Typo IV <br />kaoonn <br />2 <br />300 <br />225 <br />is <br />4os <br />3 <br />450 <br />300 <br />212 <br />4 <br />600 <br />375 <br />236 <br />3 <br />750 <br />450 <br />294 <br />6 <br />900 <br />S23 <br />332 <br />7 <br />10" <br />600 <br />370 <br />.w. <br />bra <br />6 <br />12M <br />673 <br />1 4011 <br />kr.ber <br />of <br />ilcdtwea <br />t� <br />o.�.+ <br />2 or Ina <br />750 <br />1.125 <br />3w4 <br />I.OW <br />1.M <br />tij�Q,> <br />C73..Zb3D00 <br />- "I- i <br />wer 9 <br />See 4 C-6 <br />(a IS) <br />3. Length of rock layer = area width = Rock Bed <br />4 sq. ft. + �_ ft. = �LLl ft. . <br />�. idth 510 ft. <br />Ti r�i=i�i-r r <br />ROCK VOLUME <br />I. Multiply rock area by rock depth to get cubic feet of rock:; <br />L-L�v sq. ft. x , ; f t. = ! 1> cu. f t. <br />2. Divide cu. ft. by 27 cu. ft./cu. yd. to get cubic yards; <br />, , cu. ft. = 27 = 1.1 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'i tons. <br />F. ADSORPTION WIDTH LLALi \-° t " <br />1. Percolation rate in top 12 inches of soil is ,1 1 • mpi <br />2. Select allowable soil loading rate from table; <br />�y gpd / f t' <br />3. Calculate adsorption width ratio by dividing rock laver <br />leading rate of 1.20 gpd/ft2 by allowable soil loading rate; <br />1.20 gpd/fe+ _ t L epd/ft` = <br />4. Multiply adsorption width ratio by rock laver Nridth to get <br />required adsorption width; <br />).y-) x l_ f t= . i ft <br />A width stmit Table <br />PMOLAtion Raw <br />Soil Texture <br />Craw <br />lar• <br />�tru mp 1 urn <br />Faster than 0.1 <br />oarse Sand <br />1.20 <br />1.00 <br />0.1 to 5 <br />Sand <br />1.20 <br />1.00 <br />0.1 to S <br />Fine Sand" <br />0.60 <br />2.00 <br />6 to 15 <br />5adv Loam <br />0.79 <br />1.32 <br />If, to 30 <br />Loam <br />0.60 <br />2.00 <br />it to 43 <br />Silt Loam <br />0.:;0 <br />2.40 <br />46 to 60 <br />Clav Loam <br />0.45 <br />2.67 <br />61 t0 120 <br />clay <br />0.24 <br />3.00 <br />Slower than 120 <br />Clav <br />- <br />- <br />«Sal ti� i0ti w mace d (inr ie very fine wn.l. <br />