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I <br /> 1 <br /> 4 BEDROOM HOME 320 L.F. OF GRAVITY TRENCH <br /> USE 1 EACH, 15100 GALLON SEPTIC TANK WITH 2 EACH <br /> ORENCO RISERS AND LIDS <br /> NATIVE EARTH BACKFILL <br /> 12' <br /> WOVEM MTER FAMM, <br /> 4E' dEACKM PAPER OR 2' STRAW OK) <br /> 5' SCOUR FROM SIDEWALLS <br /> PRM TO RACKFILLOM <br /> Is. MIA, PERFORATED PIPE <br /> ' TO 2-I/8' VERY CLEAN <br /> AGGREGATE DRAIN ROCK. SUDW <br /> 24' SAMPLES PRIOR TO PURCHASE <br /> TYPICAL TRENCH DETAIL <br /> NTS <br /> LOT 2 <br />