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4 BEDROOM HOME = 320 L.F. OF GRAVITY TRENCH <br /> USE I EACH, 1500 GALLON SEPTIC TANK WITH 2 EACH <br /> ORENCO RISERS AND LIDS <br /> s � <br /> NATIVE EARTH BACKFILL <br /> -MOVEN FILTER FABRIC. <br /> 42• O EACNOIG PAPER OR 2' STRAW OK> <br /> 6� REWVE SCOUR FROM SOIEWALLS <br /> PRMR TO BACKF0IIIG <br /> 111& PERFORATED PIPE <br /> 17' <br /> ' TO 2-1/2' VERT CLEAN <br /> AGGREGATE DRAIN ROCK. SUBMIT <br /> 24' SAMPLES PR10R TO PURCHASE <br /> TYPICAL TRENCH DETAIL <br /> NTS <br /> LOT S <br />