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Septic System Design
WASTE SEPTIC TANK SEPTIC TANK DISPOSAL FIELD BEDROOMS FLOW (MIN. CAPACITY MINIMUM LIQUID TRENCH LE - (SEE NOTE 1) G.P.D. GAL.) SURFACE AREA(S.F.) PERCOLATION RATE (MINUTES)(SEE NOTE 3 & 4) 1-5 1 6-7 8-10 11-15 16-20 21-30 2 260 1000 27 108 130 145 162 186 217 162 195 217 244 279 325 3 390 1000 27 4 520 1250 34 E27 260 290 325 372 433 5 650 1500 40 325 360 406 464 542 6 780 1750 47 390 433 488 557 650 SEPTIC SYSTEM DESIGN LOT # SYSTEM TYPE PERC RATE (MIN.) 1 STANDARD TRENCH 11-15 2 STANDARD TRENCH 11-15 3 STANDARD TRENCH 11-15 4 STANDARD TRENCH 6-7 5 STANDARD TRENCH 6-7 6 STANDARD TRENCH 8-10 7 TO BE DETERMINED T.B.D. 8 STANDARD TRENCH t-5 9 SHALLOW TRENCH 8-10 10 SHALLOW TRENCH 8-10 11 SHALLOW TRENCH 8-10 12 SHALLOW TRENCH 6-7 13 STANDARD TRENCH 6-7 14 STANDARD TRENCH 6-7 15 SHALLOW TRENCH 8-10 16 SHALLOW TRENCH 8-10. 17 STANDARD TRENCH 8-10 18 STANDARD TRENCH 6-7 19 STANDARD TRENCH 11-15 20 STANDARD TRENCH 11-15 21 STANDARD TRENCH 11-15 22 STANDARD TRENCH 11-15 23 STANDARD TRENCH 8-10 24 STANDARD TRENCH 6-7 25 STANDARD TRENCH 1-5 26 STANDARD TRENCH 8-10 27 STANDARD TRENCH 11-15