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<br />INDIVIDUAL SEWAGE TREATMENT SYSTEM WORKSHEET
<br />A.
<br />B.
<br />C.
<br />D.
<br />E.
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<br />H.
<br />I.
<br />J.
<br />K.
<br />L.
<br />M.
<br />N.
<br />0.
<br />FLOW
<br />Estimated
<br />measured
<br />WY gpd ~"pp \_~~
<br />_-__ x 1.5= ~ gpd
<br />SEPTIC TA.l\11< VOLUME
<br />--'d."---.,_/-=o-=o~o"--______ gallons ~\'S <\--A'c>A-Yl'l s
<br />I -/OOD r=:\\.,\.:,~
<br />SOILS (Site evaluation data)
<br />Depth to restricting layer= 5 1:..10'1--rb "'7 ') '
<br />Maximum depth of system C -3 ft= :i. .s'
<br />Percolation rate Jo. l.f MPI
<br />SSF ill_ sq ft/ gpd LDA-w\ Se>\\..-
<br />feet
<br />feet
<br />TRENCH BOTTOM AREA 6~1.f'?\...\.-"F-'E>S
<br />For trenches with 6 inches of rock below the pipe:
<br />A x F = i.e2:1_ x J,V? = LQ!:13. sq ft of bottom area
<br />For trenches with 12 inches of rock below the pipe:
<br />Ax Fx0.8 = __ x __ x 0.8 = __ sq ft of bottom area
<br />For trenches with 18 inches of rock below the pipe:
<br />Ax F x 0.66 = __ x __ x 0.66 = __ sq ft of bottom area
<br />For trenches with 24 inches of rock below the pipe:
<br />Ax Fx 0.6= __ x __ x 0.6 = __ sq ft of bottom area
<br />BED BOTTOM AREA
<br />For seepage beds with 6 or 12 inches of rock below the pipe;
<br />1.5 x A x F = 1.5 x __ x __ = __ sq ft of bottom area
<br />ROCK VOLUME IN CU Ff
<br />Rock depth below distribution pipe plus 05 foot times bottom area:
<br />M =Rock depth + 6 inches x Area (H,I,J,L,K)
<br /><-=_ + 0.5 ft) X -=-=-=-CU ft
<br />ROCK VOLUME IN CU YDS
<br />Volume in cu ft divided by 27
<br />M + 27 = cu yds -= + 27 = _::_ cu yds
<br />ROCK WEIGHT
<br />Cubic yards times 1.4 = tons
<br />N x 1.4 =tons_-_ x 1.4 =-=-tons
<br />DISTRIBUTION
<br />(Check one based on slope)
<br />__ Bed (less than 6% slope)
<br />Trenches
<br />_\L_ Drop boxes (any slope)
<br />__ Distribution box (level to slightly sloping)
<br />TRENCH LENGTH
<br />P. Select trench width=~ ft "'Jo 1l,;;,,-i:L i.:,""?'+lrP\..~$S
<br />Q. Divide bottom area by trench width: (H, I, J, or K) + P =
<br />lineal feet
<br />/<ZJ1.. + 2._ =~lineal feet ~s~ ::s 'J 0.1...i\-l.f"'\.
<br />LAWN AREA IO 'l.;.,A. l.:,"'i'.-A\X'.U-,-.,."" -Y,y>-i::
<br />R. Select trench spacing, center to center= __ feet
<br />S. Multiply trench spacing by lineal feet Rx Q = sq ft of lawn area
<br />__ x __ = __ sqft
<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 backs and separation distances.
<br />D-25
<br />Estimated Sewage Flow in Gallons pa Day (&>d)
<br />Number
<br />of Type! Type D Type DI T~p: IV
<br />Bedrooms
<br />2 300 225 180 6'~
<br />3 450 300 218 ex
<br />4 600 375 256 """ -5 750 450 294 = 6 900 525 332 ""' 7 1050 600 370 """'"' ca==-8 1200 675 408
<br />Number Minic.1= MinC:::i=
<br />of Se~Tc.i: upaciryw-o . u.id G~
<br />Bedrooms upaciry Dispoa.:
<br />(galloc,s) (gallocs)
<br />2 or less 750 1,125
<br />3 or4 1,CXXJ 1,500
<br />5 or6 1,500 2.250
<br />7 or 8 2,CXXJ 3,000
<br />over9 See fig. C-6 (x 1.5)
<br />Soil a... ... .....,.. Requ=d A.-k,, ~ -
<br />Pa=l.otion R,t,
<br />_ ....
<br />c.:-
<br />Soil Texture ~ ,_..,
<br />Minu""pc,inch ,...;:;-(mp)
<br />Faster th.an 0.1 • Coarse Sand --
<br />0.1 to5 Sand 0.83 1.20
<br />0.1 to5 FineSa.,d-1.67 0.60
<br />6to 15 Sandy Loam Jib 0.79
<br />_l6J~ 30 Loam 0.60
<br />31 to45 sillloa:::n 2.00 0.50
<br />4oto60 Oatll..o=, 2.20 0.45
<br />Slower than W--ay -(0.24)
<br />. rt!~.::::..:·~~~
<br />-Soil hayjng 501I. o, znon, <i 1w o, vayfi.ne Mn<!.
<br />-Soil -ith too lagh • paa,-t..,11" al day lor
<br />iNtal.l.wtionci an inpvu.nd atar,,d,ud •ywcc:n.
<br />.6 inches= 0% Reduction:it-
<br />12ifuches= 20% Reduction
<br />18 inches= 34% Reduction
<br />24 inches= 40% Reduction
<br />* sizing for gravelless trench
<br />_;:;i,'i''-
<br />t
<br />I/ 3D
<br />'l-
<br />Figure D-26
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