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Trench and Bed Worksheet <br />1. AVERAGE DESIGN FLOW .-------A. Estimated I 300 <br />or measured I <br />B. Septic tank capacity <br />gpd (see figure A-1) <br />x 1.5 (safety factor) = <br />1500 I gallons <br />A·1 t:stImatea ~ewage Flows m u..-u <br />Number of <br />Bedrooms Class I Class II Class Ill <br />2 300 225 180 <br />3 450 300 218 <br />4 600 375 256 <br />5 750 450 294 <br />6 900 525 332 <br />7 1050 600 370 <br />8 1200 675 408 <br />Class IV <br />60% of <br />the <br />values <br />in the <br />Class I, <br />II or II <br />columns <br />2. SOILS (Site evaluation data) <br />C. Depth to restricting layer = 6 !feet <br />0 ----- <br />D. Maximum depth of s stem Item C -3 ft= 3 feet <br />gpd <br />E. Texture Loam Percolation rate ___ 2_o __ jmpi <br />F. SSF 2.2 tt2/gpd (see figure D-15) <br />G. % Land slope 18 % <br />D-15 Soil Characterisitcs & SSF <br />Pere Rate Soil Tecture SSF <br />mpi SQ ft/Qpd <br />< 0.1 * Coarse sand 0.83 <br />0.1-5 Medium sand 0.83 <br />Loamy sand <br />0.1-5** Fine sand 1.67 <br />6 -15 Sandy loam 1.27 <br />16 -30 Loam 1.67 <br />31 -45 Silt loam, silt 2.00 <br />46 -60 Clay loam, 2.20 <br />sandy clay <br />or silty clay <br />61 -120*** Clay, sandy 4.20 <br />or silty clay <br />>120**** <br />* No trench >25% of total system <br />** Soil with >50% fine sand particles <br />*** A mound must be used <br />**** An other or performance system <br />C-1 Septic Tank Capacity in Gallons <br />Number of Minimum Capacity with <br />Bedrooms Capacity Garb. Disp. <br />2 or less 750 1125 <br />3 or4 1000 1500 <br />5 or6 1500 2250 <br />7, 8 or 9 2000 3000 <br />D-9: Soil Characteristics and Soil sizing <br />factors (SSF) for Gravelless Pipe <br />pen::clailon rate <br /><m1nutes/tnd1) <br />F'astet than O 1 ,. <br />n 1 toS <br />L11 to5 <br />6 lo!S <br />16 to30 <br />11 lo45 <br />46 lo60 <br />sdl textt.1rf· <br />CrnrseSand <br />T\.1rdlum Sand <br />Loanw Sand <br />Hne $and 0 <br />Sandy l11am <br />Lc)r:lm <br />Stlt Ltl-1m <br />Sill Clat~~"fv°?:fU ~~:;;=i I <br /><;;imfy t1ay I <br />SIily Oay I <br />.. ScJil tcucoar15e tn· SC\vage tre.atmmt. <br />line.al le<!!./ <br />gallm/day <br />0 28 <br />06 <br />0.42 <br />O S6 <br />067 <br />0 74 <br />Use-systems rcr rapidly pt-'tTneable sals . <br />.. ,..Seil h;.lving SU'¾_ LW more fine Simd I ver\_.. fine sand. <br />....... Xii \.t,,'ith l(X'I high a ~"'Crcentag-e ct d.av frr <br />installation d a stanciard in,eiamd s~?stcrn <br />Capacity with <br />Disp. and Lift <br />1500 <br />2000 <br />3000 <br />4000 <br />Page 1 of 2