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4 BEDROOM HOME = 320 L.F. OF GRAVITY TRENCH <br /> USE 1 EACH, 1500 GALLON SEPTIC TANK WITH 2 EACH <br /> ORENCO RISERS AND LIDS <br /> S n 3p1. 't <br /> NATIVE EARTH BACKFILL <br /> 12' <br /> NON-WOVEN FILTER FABRIC, <br /> 4—.FU EACHWG PAPER OR 2' STRAW uo <br /> 6� SCOUR FROM SIDEWALLS <br /> PR= TO BAWUAI IG <br /> 171 • DIA PERFORATED PIPE <br /> ' TO 2-1/2• VERT CLEAN <br /> AGGREGATE DIGIN ROCK. SUBMIT <br /> SAMPLES PRIOR TO PURCHASE <br /> 24. <br /> TYPICAL TRENCH DETAIL <br /> NTS <br /> LOT ll <br />