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• • MOUND DESIGN WORKSHEET <br /> (For Flows up to 1200 gpd) • <br /> 1 <br /> A. FLOW Estimated Sewage Flow in Calkins pa Day(gpd) 1 "',‘ <br /> Estimated 'i SO gpd Number l <br /> of or measured - x 1.5 = - gpd. roonu <br /> I II Type III 'Type IV <br /> 2 300 225 180 60% <br /> 3 450 300 218 • <br /> B. SEPTIC TANK LIQUID VOLUMES • 4 600 375 256 <br /> 5 750 450 294 i1 <br /> j-1 X S0 t 1 -/000 gallons 6 900 525 <br /> 105 332 ,;,:r` <br /> 8 1200 675 408 <br /> C. SOILS(refer to site evaluation) ,, �� Naber = <br /> 1. Depth to restricting layer= 3z or 3y inches of <br /> Bedrooms ofroa, ,, <br /> 2. Depth of percolation tests = I'D." inches `""'' `'f`'' <br /> 3. Percolation rate )I•a mpi 23 a'41705000 1.5.125 <br /> 4. Land slope y % 7 a 8 1zo�0°o0 �' <br /> over 9 See 6g.C-6 (x 1.5) <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 = 0 f <br /> iS.0 . gpd x 0.83 sq. ft./gpd = (,az sq. ft.A-J'%=1-4 4 <br /> 2 Select width of rock layer(10 feet or less) = 10 ft. <br /> 3. Length of rock layer= areas width= Rock Bed <br /> 4S 4 sq. ft.+ 10 ft. = 10 c ft. 1rirvrti•�•N•tiK• M•i.Mti•ti��ti <br /> •ti <br /> lc;At: {egtir :ti:ti:titix:441 idth <10 ft. <br /> 140.7.05445:245:404555%.4.155 <br /> E. ROCK VOLUME Length --1 • <br /> 1. Multiply rock area by rock depth to get cubic feet of rock; <br /> VtS4 sq.ft. x ).0acft. = 0i4ecu.ft. <br /> 2. Divide cu.ft.by 27 cu.ft./cu. yd. to get cubic yards; <br /> 7) cu.ft. - 27= "D 1 cu. yd. <br /> 3. Multiply cubic yards by 1.4 to get weight of rock in tons; <br /> 2.") ,cu.yd.x 1.4 ton/cu. yd. = 35/ tons. <br /> F. ADSORPTION WIDTH Li->!K LOA w1 <br /> Absorption Width s nn8 Table <br /> 1. Percolation rate in top 12 inches of soil is 11.*z mpi Percolation Rate edam tom.. <br /> Minutes w h <br /> Soil Texture �■ J�i.s <br /> s v � <br /> 2. Select allowable soil loading rate from table; Faster than 0.1 Coarse Sand 1.20 1.00 <br /> L.1-.L.C. gpd/ft2 0.1 to 5 Sand 1.20 1.00 <br /> 0.1 to 5 Fine Sand" 0.60 2.00 <br /> 6 to 15 Sandy Loam 0.79 1.52 <br /> 3. Calculate adsorption width ratio by dividing rock layer 31 too 45 Silt Loam 0.0 2 40 <br /> loading rate of 1.20 gpd/ft2 by allowable soil loading rate; 46 to 60 Clay Loam 0.45 2.67 <br /> 61 120 1.20 gpd/ft2s . .0 gpd/ft2= a;t,') SlowerOthan 120 _ lay 0.24 - <br /> '. <br /> -Sal having 50%or more at fine or vay fine sand. <br /> 4. Multiply adsorption width ratio by rock layer width to get <br /> required adsorption width; <br /> z.t,7 x )o ft.3t,.'") ft <br /> .J <br />