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INDIVIDUAL SEWAGE TREATMENT SYSTEM WORKSHEE'1' <br />J <br />FLO%V <br />A. <br />Estimated r r, gpd <br />measured x 1.5= - gpd <br />SEPTIC TANK VOLUME <br />B. <br />gallons <br />SOILS (Site evaluation data) <br />G <br />Depth to resti;-:ing layer = jr-;' 7 '%-'= feet <br />D. <br />Maximum der-h of system C - 3 ft = feet <br />E. <br />Percolation rave 12.4 M171 <br />F. <br />SSF L2,n- sq i-/gpd <br />TRUnCH BOTTOM AREA <br />H_ <br />For trenches Kith 6 inches of rock below the pipe: <br />A x F = x = _ sq ft of bottom area <br />1. <br />For trenches with 12 inches of rock below the pipe: p' <br />A x F x OS = , -c rrx x 0.8 = `L ( sq ft of bottom area.+Ids0:yV <br />J. <br />For trenches with 18 inches of rock below the pipe: "K= 90o141,T <br />AxFx0.66- x x0.66=_sgftofbottom area <br />K. <br />For trenches with 24 inches of rock below the pipe: <br />AxFx0.6= x_x0.6= sgftofbottom area <br />BED BOTTOM AREA <br />L <br />For seepage beds with 6 or 12 inches of rock below the pipe; <br />1SxAxF=1-5x_x`=^sgftofbottom area <br />ROCK VOLUME IN CU FT <br />K <br />Rock depth below distribution pipe plus OS foot times bottom area: <br />M =Rock depth + 6 inches x Area (H,I,J,L,K) <br />( o +OSf0x:gal =j cvft <br />ROCK VOLUME IN CU YDS <br />N. <br />Volume in cu ft divided by 27 <br />M + 27 = cu yds=.& 27 = H"7 cu yds <br />ROCK WEIGHT <br />O. <br />Cubic yards times 1.4 - tons <br />N x 1.4 = tons 44c7 x 1.4 = .(ga tons <br />DISTRIBUTION <br />(Check one based on slope) <br />Bed Oess than 6% slope) <br />Trenches <br />- Drop boxes (any slope) <br />Distribution box (level to slightly sloping) <br />TRENCH LENGTH <br />r. <br />Select trench width = _La ft <br />Q. <br />Divide bottom area by trench width: (H,1, J, or K) + P = <br />lineal feet <br />+ _ = lineal feet bx 'c o <br />LAWN' AREA <br />R. <br />Select trench spacing, center to center = 1L feet <br />S. <br />Multiply trench spacing by lineal feet R x Q = sq ft of lawn area <br />x cr( = Z�-sq ft <br />LAYOUT (Use other side) <br />1. Select an appropriate scale; one square = <br />2. Show pertinent property boundaries, right-of-v%ay, easements. <br />3. ,-how location of house, garage, driveway, and aL other <br />improvements, existing or proposed <br />4. Show location and layout of sewage treatment system. <br />5. Show location of water supply well. <br />6. Dimension all set backs and separation distances. <br />D•25 <br />Est m " St. qe Fier ,a G&Unai M Day jp4) <br />\utabcr <br />or <br />T�ycI <br />T�pc n <br />T,;c GI <br />Ta IV <br />Bcbonta n <br />2 300 <br />2.3 <br />I m <br />Kt <br />3 �c50 <br />300 <br />211 <br />s <br />• 600 <br />375 <br />2-44 <br />S 1 750 <br />e5o <br />2'5k: <br />3 <br />6 1 900 <br />525 <br />332 <br />a <br />7 I 1050 <br />600 <br />3,0 <br />1 1200 <br />675 <br />409 <br />NYmtntr <br />�t ace <br />St 7" <br />%4a= - <br />Gerry � <br />Of <br />%d <br />c <br />Bedrooms <br />C. . <br />Mapes <br />(Sib=) <br />(pilaw) <br />2 or less <br />750 <br />1.125 <br />3 or a <br />1.000 <br />1.5W <br />5 or 6 <br />1,500 <br />2.250 <br />1 or 8 <br />2.000 <br />3.000 <br />over 9 <br />See rig. C-6 <br />(: 1.5) <br />t�.d.frw iN <br />Scil TeL ri-e <br />M•� v <br />fr'� <br />►IrV r ps ud <br />r <br />trpJ <br />Faster than 0.1•Cows* <br />sand <br />- <br />0.11oS <br />Sand <br />0.41 <br />120 <br />0.1 io 5 <br />Fu a sander <br />1.67 <br />0.60 <br />61015 <br />5w%drLoam <br />0.79 <br />16 to 30 <br />Loan <br />1.6 <br />0.60 <br />31 to 45 <br />5ZI Lot..-i <br />-100 <br />030 <br />t610 60 <br />Oay Loin <br />220 <br />0.aS <br />Slm+c that 60•'• <br />❑ar <br />- <br />(026) <br />W OYM tM R., ti/rl/l <br />Aa <br />�.t..rtnr�...lw.wl <br />•'s�.1� M <br />M�w�iJ <br />.na.ilw.w r M �rtir� <br />6 inches= 0% Reduction* <br />12 inches= 20% Reduction <br />18 inches= 34% Reduction <br />24 inches= 40% Redudion <br />• sizing for graveUess trench <br />T <br />2 inch Cow <br />t <br />4 inch Pipe <br />1+ <br />6.24 inch <br />Rock Below the Pipe <br />I <br />Figurc D-26 <br />