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University of Minnesota Trench and Bed Worksheet <br /> All boxed rectangles must be entered,the rest will be calculated. <br /> 1. Flow o,,s,n <br /> A. Estimated Flow 450 gpd(Fig.A-1) 3��� <br /> TRCATMlNT <br /> stimate ewage ows in P"O°""" ��� <br /> Number of Class <br /> Bedrooms I II III IV <br /> 2 300 225 180 60%of <br /> 3 450 300 218 the ump an c inimum izmg <br /> 4 600 375 256 values 500 gallons or 100%of Average <br /> 5 750 450 294 in the Design Flow(A-1)or duai <br /> 6 900 525 332 Ciass I, aitematin um s stem <br /> 7 1050 600 370 II or II <br /> 8 1200 675 408 columns <br /> 2. Minimum Septic Tank Capacity <br /> B. Septic tank capacity(Fig C-1) 2000 Galions Number of compartments� <br /> C. Effluent filter(yes/no) recommended <br /> C-1 Minimum Septic Tank Capaci in Gallons <br /> Capacity with GD <br /> Number of Minimum Capacity with and pump in <br /> Bedrooms Capaci GD' basement** <br /> 2 orless 750 1125 1500 <br /> 3 or4 1000 1500 2000 <br /> 5 or 6 1500 2250 3000 <br /> 7,8 or 9 2000 3000 4000 <br /> 'GD=garbage disposal,Must have multiple tanks or compartments <br /> " Must have multipte tanks,compartments or efFluent screen <br /> 3. Pump Tank Specifications <br /> D. Pump tank needed(yes/no) es Minimum size if needed 1000 gallons <br /> 4. SOILS(Site evaluation data) <br /> E. Depth to restricting layer= 98.6 (ELEVATION 0 F HIGHEST REDOX.) <br /> F. Maximum depth of system Item E-3 ft= 98.6 + 3 = 101.6 ft <br /> G. Texture Loam/Sand loam Percolation Rate Ompi <br /> if available <br /> H. SSF 1.67 ftz/gpd(see figure D-15) <br /> I. %Slope �% <br /> D-15 Soil Characteristics&SSF <br /> Perc Rate Soil Te�ure Soil Sizing Factors <br /> m i ftZl pd <br /> <0.1 ` Coarse sand 0.83 <br /> 0.1-5 Medium sand 0.83 o renc > o 0 o a sys em <br /> Loamy sand " Soil with>50%fine sand particles <br /> 0.1-5*' Fine sand 1.67 "' A mound must be used <br /> 6-15 Sandy foam 1.27 ""An other or performance system <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 siRy clay <br /> �120„�x Page 1 of 2 <br />