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MOUND DESIGN WORKSHEET <br />(For Flows up to 1200 gpd) <br />A. FLOW <br />Estimated -0 �5-'O gpd (see pages D-7 or I-3, 4, 5) <br />or measured --- gpd x 1.5 = <br />B. SEPTIC TANK LIQUID VOLUMES <br />4 J-/oo a gallons (seepages C-3 or C-5) <br />C. SOILS (refer to site evaluation) 1,0-1 0,V C- <br />1. Depth to restricting layer = a o inches I <br />2. Depth of percolation tests = ! a inches <br />3. Percolation rate S • 5 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 />J gpd x 0.83 sq. ft./gpd = �� sq. ft. -t 10 -,o <br />2. Select width of rock layer (10 feet or less) = 1 ft. <br />3. Length of rock layer = Area + Width = <br />G_ ieisq.ft.+ /o ft. =Lu ft. <br />E. ROCK VOLUME <br />1. Multiply rock area by rock depth to get cubic feet of rock; <br />4,, t sq. ft. x/,os ft. = ecu. ft. <br />2. Divide cu. ft. by 27 cu. ft./cu. yd. to get cubic yards; <br />rL-�, cu. ft. + 27 = z,) cu. yd. <br />3. Multiply cubic yards by 1.4 to get weight of rock in tons; <br />D n cu. yd. x 1.4 ton/cu. yd. = a5!� tons. <br />F. ADSORPTION WIDTH �LLA " L-04-1 <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 />. q,5' gpd/ft" <br />3. Calculate adsorption width ratio by dividing rock layer <br />loading rate of 1.20 gpd/fP by allowable soil loading rate; <br />1.20 gpd/ftp+ ,,t < gpd /ft2= ;)- L,? <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 />,�.Lr7 X is ft=.0 t.,2ft <br />Eaimaaed Se -age Flus in Gallunl pa day <br />(Spd) <br />an bex <br />Uftof <br />Abmgd -Wt% <br />0ft* Law <br />WIaM <br />F~ tMa0.1 • <br />GOana Swd <br />- <br />of <br />TyPt I <br />I <br />Ty fc 11 <br />Type III <br />I <br />Type <br />neaarr.t <br />Fre Sand •• <br />0.60 <br />2.00 <br />IV <br />2 <br />300 <br />221 <br />160 <br />Loam <br />3 <br />450 <br />300 <br />216 <br />0.50 <br />4 <br />600 <br />371 <br />216 <br />2A7 <br />5 <br />710 <br />410 <br />29a <br />Steno than <br />6 <br />900 <br />325 <br />332 <br />7 <br />1050 <br />600 <br />370 <br />1200 <br />673 <br />406 <br />Snti T..4 C.V+ W" i. a.%- <br />%ombrof <br />M.a•. Lq..d <br />L.q..Jc•p�y.M <br />a.Are.w. <br />Cq•cry <br />arlb•M "Paw <br />2w 1e.. <br />730 <br />1123 <br />2 r 4 <br />1000 <br />Iwo <br />4 r 6 <br />1310 <br />2210 <br />7, 6 -1 <br />» <br />30M <br />a.v 1 <br />-- <br />Rock Bed <br />II I• J•I J•J•J•I•I•I•J•J•J <br />ZZ�.�`�. I•I•I•I•I•J•J <br />• • ??__f�� 1•x•1,•\•ti•1.• til Sett. <br />•I ♦.3••I� J•J•J•J•J•I.J <br />•I•I• •J •J• •J•I•J•: •: •J•J <br />F--- I.en6th <br />Absorption VAdth Sizing Table <br />fon elation w <br />in Mimleat <br />1fM(MPI) <br />Solt Teatan <br />Gallons <br />pet day per <br />Pere fm <br />Uftof <br />Abmgd -Wt% <br />0ft* Law <br />WIaM <br />F~ tMa0.1 • <br />GOana Swd <br />- <br />- <br />0.I e S <br />Srd <br />1.20 <br />1= <br />0.1 io3 a• <br />Fre Sand •• <br />0.60 <br />2.00 <br />6,013 <br />Sandy Lana <br />0.79 <br />137 <br />16 In 30 <br />Loam <br />0.60 <br />2.00 <br />311045 <br />SiM Lar" <br />0.50 <br />7.40 <br />46 b 601.0am <br />0.45 <br />2A7 <br />4010120 <br />ay <br />0.24 <br />5A0 <br />Steno than <br />Clay <br />- <br />-- <br />12D'-. <br />