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MOUND DESIGN WORKSHEET <br />(For Flows up to 1200 gpd) <br />A. FLOW <br />Estimated 7 gpd (see pages D-7 or I-3, 4, 5) <br />or measured — gpd x 1.5 <br />B. SEPTIC TANK LIQUID VOLUMES <br />I - 1) ,J -t 1 -;Doo gallons (seepages C-3 or C-5) <br />C. SOILS U, r to site evaluation) <br />1. Depth to restricting layer= <br />2. Depth of percolation tests = inches <br />3. Percolation rateg , 0 mpi <br />4. Land slope 3 % <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 />r) S0 gpd x 0.83 sq. ft./gpd = o = sq. ft.-- i <br />2. Select width of rock layer (10 feet or less) = ft. <br />3. Length of rock layer = Area + Width = <br />t -g U sq. ft. + j_ ft. _ (--/ ft. <br />E. ROCK VOLUME <br />1. Multiply rock area by rock depth to get cubic feet of rock; <br />L. sq. ft. x L Q.Sft. _ JLje cu. ft. <br />2. Divide cu. ft. by 27 cu. ft. /cu. yd. to get cub: z yards; <br />01_JL cu. ft. + 27 = ';II)_ cu. yd. <br />3. Multiply cubic yards by 1.4 to get weight of rock in tons; <br />-j1 cu. yd. x 1.4 ton/ cu. yd. _ -a2� tons. <br />F. ADSORPTION WIDTH <br />1. Percolation rate in top 12 inches of soil ismpi <br />2. Select allowable soil loading rate from table on page E-; <br />,,4S gpd/fez <br />3. Calculate adsorption width ratio by dividing rock layer <br />loading rate of 1.20 gpd/ft2 by allowable soil loading rate; <br />1.20 gpd/ft2+ .4 S gpd/ft' =_. <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 />Emims" Sewage Flows i. Galkws pa ay <br />f6pd) <br />um ixt <br />.r <br />Type' <br />7j'pe 11 <br />7ygw 111 <br />PO <br />11cxn, <br />.La <br />f v <br />2 <br />300 <br />225 <br />180 <br />3 <br />450 <br />300 <br />218 6t+ <br />4 <br />600 <br />375 <br />236 <br />5 <br />7'0 <br />450 <br />241 <br />6 <br />9l)0 <br />323 <br />M <br />7 <br />1050 <br />600 <br />77. <br />t <br />1200 <br />673 <br />s <br />Srytit T—h C.p. it:♦ <br />>.n1 -r of <br />%1,,. -�.m 1..40.1 <br />1..q�J -P- y ...� <br />1k ,. <br />ch.w..:y <br />,. b sc e,.,...1 <br />750 <br />1125 <br />Sd4 <br />Inn <br />ow <br />4 ter L <br />151st <br />2250 <br />7.8 w 9 <br />MIA <br />llaa7 <br />Rock Bed <br />h s)orl. <br />