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MOUND DESIGN WORKSHEET <br />(For Flows up to 1200 gpd) <br />A. FLOW <br />Estimated 0S0 gpd (seepages D-7 or I-3, 4, 5) <br />or measured - gpd x 1.5 = <br />B. SEPTIC TANK LIQUID VOLUMES <br />gallons (seepages C-3 or C- 5) <br />C. SOILS (refer to site evaluation) <br />1. Depth to restricting layer = -Aq" le 30il inches <br />2. Depth of percolation tests = 1 a" inches <br />3. Percolation rate 6. CY mpi <br />4. Land slope S % <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 />,)�v gpd x 0.83 sq. ft. / gpd =ya sq. f t. -i ► o'%, <br />2. Select width of rock layer (10 feet or less) _ �.. 0 ft. <br />3. Length of rock layer - Area + Width = <br />LK4 sq. ft. + /_ ft. = G V ft. <br />Eaiwwd Uwase Flom is COMB Fa Jay <br />care► <br />a1 <br />T$ as I <br />Ty" II <br />Typr III <br />ry <br />t2S <br />too <br />'00 <br />214 <br />tw <br />2% <br />.too <br />294 <br />I <br />332 <br />Tr L <br />370 <br />L <br />4 <br />.r+. <br />t w �.. <br />770 <br />1123 <br />• r • <br />IOO <br />1lIIO <br />•�4 <br />1C <br />wo <br />7.e.+ <br />n» <br />xco <br />t, Sd1.l <br />E. ROCK VOLUME <br />1. Multiply rock area by rock depth to get cubic feet of rock; <br />(I sq. ft. x L. - ft. _ ?1 �d cu. ft. <br />2. Divide cu. ft. by 27 cu. ft./cu. yd. to get cubic yards; <br />aL� cu. ft. + 27 = cu. yd. <br />3. Multiply cubic yards by 1.4 to get weight of rock in tons; <br />-J,-1 cu. yd. x 1.4 ton/cu. yd. = 2_V tons. <br />F. ADSORPTION WIDTH 4-`�44 A"i <br />1. Percolation rate in top 12 inches of soil is mpi <br />2. Select allo.irable soil loading rate from table on page E-; <br />, 4 gpd/ft' <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+ .. W� gpd/tt' = 3 <br />Check this value on page E-I6. <br />4. Multiply adsorption width ratio by rock layer width to get <br />required adsorption width; <br />2.G,) x 9 ft = 1 ft <br />Pock Bed <br />3 sFidth 11011. <br />,r•r�r��r:r� � _}r �: r ri <br />1-- lenalh <br />Ab9"iM WWlh SWf T ble <br />PwoNwa.11n <br />Soil T.uwa <br />Ce1ew <br />:f;ha <br />iteeio of <br />AMuple aYMM,Omp <br />wiM <br />F~ dre 0.1 <br />Comm Sews <br />& I IDS <br />Sad <br />1.20 <br />to <br />0.1195 S •• <br />roue Saw •• <br />a60 <br />2.110 <br />610IS <br />S.efylaw <br />0.1,11 <br />132 <br />161030 <br />Loew <br />0.N <br />2A0 <br />311045 <br />Sib law <br />2.e0 <br />N n f0- <br />a* 120 <br />Cloy Lore <br />tl+y <br />74 <br />ZA7 <br />5.10 <br />Sloe duw <br />Clay <br />-- <br />--- <br />I30•• <br />