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INDIVIDUAL SEWAGE TREATMENT SYSTEM WORKSHEET <br />' <br />FLOW <br />A. <br />Estimated D gpd <br />measured _x 1S= gpd <br />Ju:Mf' TANK VOLUME <br />B. <br />1-IJ So I - 1000 gallons <br />SOILS (Site evaluation data) <br />C. <br />Depth to restricting layer - S- 0" -M > �' feet <br />D. <br />Maximum depth of system C - 3 ft = a feet <br />E. <br />Percolation rate 11.01 MPI <br />F. <br />SSF Ljaa sq ft/gpd <br />TRENCH BOTTOM AREA <br />H. <br />For trenches with 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: <br />AxFx0.8n_x_x0.8=_sgftofbottom area <br />J. <br />For trenches with 18 inches of rock below the pipe: o <br />A x F x 0.66 ='1S0 x J. v7 x 0.66 - J_jk sq ft of bottom 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 />1.5xAxF=1.5x_x^=_sgftofbottom area <br />ROCK VOLUME IN CU FT <br />M. <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 />(_L..< +0.5ft) x2L�L=L4�,acuft <br />ROCK VOLUME IN CU YDS <br />N. <br />Volume in cu ft divided by 27 <br />M+27=cuyds1jaS+27=1&2—cuyds <br />ROCK WEIGHT <br />O. <br />Cubic yards times 1.4 - tons <br />Nx1.4=tons 0 x1.4=tons <br />DISTRIBUTION <br />(Check one based on slope) <br />_ <br />Bed (less than 6% slope) <br />Trenches <br />V Drop boxes (any slope) <br />_ Distribution box (level to slightly sloping) <br />TRENCH LENGTH <br />P. <br />Select trench width = ft <br />Q. <br />Divide bottom area by trench width: (H, I, J, or K) + P = <br />lineal feet <br />ILL + jLg = ;:LSQ lineal feet <br />LAWN AREA <br />R. <br />Select trench spacing, center to center - <Z feet <br />S. <br />Multiply trench spacing by lineal feet R x Q = sq ft of lawn area <br />19L xi? =a4a•isgft <br />LAYOUT (Use other side) <br />1. Select an appropriate scale; one square = feet. <br />2. Show pertinent property boundaries, right-of-way, easements. <br />3. Show location of house, garage, driveway, and all 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 back- and separation distances. <br />D-25 <br />Eatioatod Sewage Flow is Gallons per Day (tpd) <br />Numaber <br />T'Pe I <br />Type 11 <br />Type III <br />Type rV <br />BeA0( <br />2 <br />3 <br />300 <br />450 <br />225 <br />300 <br />ISO <br />211 <br />son <br />K <br />4 <br />600 <br />375 <br />2.56 <br />5 <br />750 <br />450 <br />294 <br />u <br />6 <br />900 <br />525 <br />332 <br />U. <br />7 <br />1 <br />1050 <br />1200 1675 <br />600 <br />370 <br />406 <br />ti <br />Namur <br />of <br />' <br />,._~ <br />esky iLb <br />Bedrooms <br />=)! <br />2 or less <br />759 <br />1,125 <br />3 or 4 <br />1.000 <br />1,500 <br />5 or 6 <br />1.500 <br />2,250 <br />7 or 8 <br />2.000 <br />3.000 <br />over 9 <br />See rig. C-6 <br />(x 1.5) <br />sed or. w~ s. ^—s.I V s...... <br />Sod T.h. <br />hd <br />M <br />Faster than 0.1• <br />Coam Sand <br />— <br />0.1 toy <br />Sand <br />O13 <br />120 <br />0.1 to 5 <br />Fine Sand <br />1.67 <br />0.60 <br />61015 <br />Sandy Loam <br />1 <br />0.79 <br />31to45 <br />Silt — <br />21M <br />050 <br />46 to 6Q <br />Osy Loam <br />21J <br />O.IS <br />Slower thr 60 — <br />— <br />(024) <br />• s.a s» arm Iss r.y. a..r..r. <br />6 inches= 0% Reduction* <br />12 >tnctess:10 Reduction <br />18 inches= 34% Reduction <br />24 inches= 40% Reduction <br />" sizing for gravelless trench <br />T <br />2 inch Cover <br />I <br />4 inch Pipe <br />lC� <br />6-24 inch <br />Rock Below the Pipe <br />I <br />Figure D-26 <br />