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INDIVIDUAL SEWAGE TREATMENT SYSTEM WORKSHEET <br /> D-25 <br /> FLOW Estimated Sewage Flow in Gallons per Day(gpd) <br /> t A. ' Estimated 9s0 gpd <br /> measured - x 1.5= Nuof mber gpd Bedrooms <br /> Typo I Type II Type III Type IV <br /> SEPTIC TANK VOLUME <br /> B. `a- 100 D gallons 3 45• 500 33oo i18 a` <br /> 4 600 375 256 „r <br /> SOILS(Site evaluation data) 6 90000 5225 32 ,h <br /> C. Depth to restricting layer= 3-t0" TD 4 f-a'feet .. s 1220000 675 4odor <br /> 08 `o,® <br /> D. Maximum depth of system C-3 ft= ,S feet <br /> E. Percolation rate_ (e• MPI <br /> F. SSF /.(.) sq it/,_ �i Loll-»-- EO%L.. Num;, . , • <br /> °f se'L: c.i11...'1, '1-: <br /> Liquid Gatbaige <br /> Capacity <br /> TRENCH BOTTOM AREA Etedr°°it'S )• (ski <br /> H. For trenches with 6 inches of rock below the pipe: 2 or less 750 1.125 <br /> A x F= x = sq ft of bottom area 3 or 4 1,000 1.500 <br /> I. For trenches with 12 inches of rock below the pipe: 5 or 6 1,500 2.250 <br /> A x F x 0.8= x x 0.8= sq ft of bottom area 7 or 8 2.000 3,000 <br /> J. For trenches with 18 inches of rock below the pipe: over 9 See fig.C-6 (x 1.5) <br /> A x F x 0.66= x x 0.66= sq ft of bottom area ail arase:eo 4 Required Areas for Sewage Seamen* <br /> K. For trenches with 24 inches of rock below the pipe: Percolation Rate acme I. Calm <br /> AxFx0.6= x x0.6= sq ft of bottom area s soaTecture �al ha <br /> BED BOTTOM AREA 'C 4.s y - Faster than 0.1• Coarse Sand - <br /> L. For seepage beds with•6sor 12 inches of rock below the pipe; <br /> Oa tos sand 0.67 0.60 <br /> Pag ea to s Fine Sand" 1.67 0.60 <br /> 175-x A x F= x 1-)‹.0,_x l.t0') = r)51 sq ft of bottom area 16to15 Sand 0.79 <br /> USS /.aSx '�S1 X14 60,.-r-- ".: • <br /> 31to45 Silt Loam 2." 030 <br /> ROCK VOLUME IN CU FT46 to 60 Oay Loam220 0.45 <br /> Slower than 60"' 0 ay - (024) <br /> M. Rock depth below distribution pipe plus 0.5 foot times bottom area: <br /> •Soil too coarse for river treatment <br /> M=Rock dept1).,+6 inches x Area(H,I,J,L,K) Use system for rapidly pemria5le mil. <br /> '''Soil lawns 504 or more of fine or ver fine sand <br /> ( 1.0 + ft)x °V+-it =)a a z cu f t •.•Sod with too high a peea.ase d loiter <br /> itwll.uon of an ingroutd etandand erten <br /> ROCK VOLUME IN CU YDS <br /> I N. Volume in cu ft divided by 27 <br /> M+27=cu yd s l dA?+27= 1-1,i cu yd s <br /> ROCK WEIGHT .6 inches= 0% Reduction* <br /> O. Cubic yards times 1.4=tons <br /> N x 1.4=tons 4 ' x 1.4= G tons 12 inches=20%Reduction :' <br /> .`18`iricles=34% Reduction <br /> DISTRIBUTION 24 inches=40% Reduction <br /> (Check one based on slope) * <br /> Bed(less than 6%slope) sizing for gravelless trench <br /> Trenches <br /> Drop boxes(any slope) <br /> Distribution box(level to slightly sloping) <br /> TRENCH LENGTH C044i:rdi:f:r:r:rlf:f:?• <br /> T <br /> rti.tir1rV.11r111rtirtirtirti•rti <br /> 2 inch Cover <br /> P. Select trench width= ft r?�ti•ti•�'ti•�•ti'ti':''''•''ti <br /> r•r•r•r•r•r•r•r•r•r•r•r• <br /> 0.14•P•ti.ti.ti. .ti.�.ti.ti.ti.ti <br /> r•r•r•r•r r•r•r•r• t� <br /> Q. Divide bottom area by trench width: (H,I,J,or K)+P= ;,•ti•ti•+• ti•ti•.o.,- 1 <br /> r•r.r•r r•r•r•r• <br /> lineal feet ~r1r1rti• r~r~rtir.. <br /> rtif�f�f�f rti.ti.ti.ti *inch pipe <br /> _=_lineal feet r•r•r• <br /> .}•ti•ti•ti• ti•+•+•+ <br /> 'r r.r•r•r• f•r•r•r• <br /> LAWN AREA :'•�•~.`"~" �"'"�•~"~ <br /> r•r•r•r•r• t•!•r•r•rN• <br /> R. Select trench spacing,center to center= feet 1� <br /> P g� ;�rtirtirtirtirtirtirtir•r•r•r•r•r• <br /> r•17-11:r•r•f•rtirtir:}:f1•}~ <br /> S. Multiply trench spacing by lineal feet R x Q=sq ft of lawn area ::1.• ;:ftif1f1}+}}fti;1}tiPg. 6-24 inch <br /> x = sq ft .......1.0::::::::P...%.%.00rti.tirtirtirtirti.ti Rock Below the Pipe <br /> r••r•r•r•r•r."...r•r•r•r•r.r• <br /> r•r•r•r•r•r•r•r•r•r•r•r•r• <br /> • <br /> LAYOUT(Use other side) .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• <br /> ati.,•ti•ti•+•%,+e.•+•ti•ti•ti••••+ <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. Figure D-26 <br />