Laserfiche WebLink
Trench and Bed Worksheet <br />1. AVERAGE DESIGN FLOW -------, A. Estimated I 450 <br />or measured I <br />B. Septic tank capacity <br />gpd (see figure A-1) <br />x 1.5 (safety factor) = <br />2000 I gallons <br />IA·1 Estimated sewage Flows m Gt'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 />2. SOILS (Site evaluation data) <br />0 -----gpd <br />Class IV <br />60%of <br />the <br />values <br />in the <br />Class I, <br />II or II <br />columns <br />C. Depth to restricting layer = .___6___.!feet <br />D. Maximum depth of system Item C -3 ft= <br />E. Texture Loam I _____ ___, _____ _. <br />F. SSF 2.2 ltt2/gpd (see figure D-15) i-------G. % Land slope 18 1% ..._ ____ __. <br />D-15 Soil Characterisitcs & SSF <br />Pere Rate Soil Tecture SSF <br />mpi SQ ft/gpd <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 />3 feet <br />Percolation rate ...__ __ 2_0 _ __.!mpi <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 />linE.c>al feet/ <br />gallm/day <br />-----~-----,-~-.......,,.~-,------Faster than O 1 • Crnrse Sand <br />0 1 10 5 Medium Sand <br />01 toS <br />otnlS <br />161030 <br />11 ln45 <br />46 lo60 <br />Lrnmv Sand <br />Ane $and"' <br />S.1ndy l,snn <br />Lt'Jram <br />Stlt Loam <br />Sili <br />Clav Loam (CU <br /><'.;andy ct <br />Stlt-,-' Cl <br />Oav <br />Sandvbav <br />Silty·aa/ <br />0 28 <br />06 <br />0.42 <br />0 56 <br />0 67 <br />0.74 <br />.. Saii tco coarse for S(:\•,rage treatrnmt <br />Usesvsterns frr rapidl,,... penne.able sdls . <br />..... Xil having 50'1r or 1'l)l11.-C' fine sand t Ver\' fint~ sand. <br />~"' .. Seil vvith too high a l-"\Crcentage ct day (cr <br />in~iallatian ci a standard ingn::)lmd system. <br />Capacity with <br />Disp. and Lift <br />1500 <br />2000 <br />3000 <br />4000 <br />Page 1 of 2