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MOUND DESIGN WORKSHEET <br /> (For Flows up to 1200 gpd) <br /> A. FLOW Estimated Sewage Flow in Gallons per Day(ad) <br /> Estimated ')S o gpd <br /> Nttmtax <br /> or measured x 1.5 = gpd. Bedrooms Type I II Type III Type IV <br /> 2 300 225 180 sos <br /> B. SEPTIC TANK LIQUID VOLUMES 3 600 300 u8 <br /> a 6ao 37s 256dam <br /> 5 750 450 294 <br /> gallons 6 900 525 332 vas <br /> 7 1050 600 370 <br /> 8 1 1200 1 675 409 <br /> /l."�14�� IK' <br /> C. SOILS(refer to site evaluation) Number 14-r� � <br /> 1. Depth to restricting layer= a o�' i t,*', � Bedroom <br /> inches m <br /> 2. Depth of percolation tests = l inches <br /> 3. Percolation rate 5,a mpi 23 or 4 ka i 05000 1.55 <br /> 4 5 or 6 1.500 2,230 <br /> . Land slope % <br /> 7 or 8 2.000 3,000 <br /> over 9 See fig.C-6 (113) <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 /> SJ gpd x 0.83 sq.ft./gpd= c,az sq.ft.-+16%, <br /> 2. Select width of rock layer(10 feet or less) = )t7 ft. <br /> 3. Length of rock layer=area-1-width= Rock Bed <br /> c,q.LA sq.ft. ft. = r.q ft. O'ki; V ti..•,MO. V-6 <br /> •r•r•r•r•r•r•r•r•r r•r•r•r•r•r•r• <br /> ti.�•�.ti•ti•ti•ti•ti•ti•�•ti•�•ti•�•tiw•ti <br /> r•r•r•r•r•r•r•r•r•r•r•r.r•r•r•r• tdth 510 ft <br /> ti.ti•�•ti•ti•ti.ti•ti•�•ti.ti.ti•ti•ti•ti•ti•ti <br /> r•r•r•r•r•r•r•r•r r•r•r•r•r•r•r• <br /> ti•ti•1K•ti•N4•t•ti•t•tiNK•\HA•ti <br /> •r•r•r•r•r•r•r•r•r•r•r•r•r•r•r•r• <br /> E. ROCK VOLUME ` �— Length —� <br /> 1. Multiply rock area by rock depth to get cubic feet of rock; <br /> t,4s4 sq.ft.x i.�ft.= 1,s cu.ft. <br /> 2. Divide cu.ft.by 27 cu.ft./cu.yd. to get cubic yards; <br /> r)l u cu.ft. i 27=—,7 cu.yd. <br /> 3. Multiply cubic yards by 1.4 to get weight of rock in tons; <br /> an cu.yd.x 1.4 ton/cu.yd. _ tons. <br /> F. ADSORPTION WIDTH L �' Lori�t'f Wicith Sizing Table <br /> 1. Percolation rate in top 12 inches of soil is 5•:k mpi Percolation Rate �- "�°°• <br /> minut"(..Xr i:�t+ Soil Texture <br /> 2. Select allowable soil loading rate from table; Faster than 0.1 Coarse Sand 120 1.00 <br /> 0.1 to 5 Sand 120 1.00 <br /> gpd/ft2 0.1to5 Fine Sand— 0.60 2-00 <br /> 6 to 15 Sandy Loam 0.79 152 <br /> 3. Calculate adsorption width ratio by dividing rock layer 31 to 45 Silt Loam Lbarn 0550 2.4400 <br /> loading rate of 1.20 gpd/ft2 by allowable soil loading rate; 4 tt 1 0 Clay Loam 024 67 <br /> 1.20 gpd/ft2+ ,u S gpd/ft2= a-L'J Slower than 120 CCllaav — — <br /> •`Soil laving 50%or mare of fine or very fine nand <br /> 4. Multiply adsorption width ratio by rock layer width to get <br /> required adsorption width; <br /> -A.t"7 x /0 ft= :it .? ft IL <br />