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DETROIT BARRACKS SPETIC SYSTRAM DESIGN ENGINEER: JIM BURBY 02-03-87 PROJECT DESCRiPTiON THIS PROJECT CONSISTS OF TWO FOURPLEX LIVING UNITS, ONE DUPLEX LiViNG UNIT, AND A MESS HALL (EQUIVALENT TO A 20 SEAT RESTAURANT) WHICH COLLECT1VLY GENERATE A DESIGN FLOW OF 5000 GPU OF SEWAGE. EACH BUILDING IS CONNBCTF~D TO A SEPTIC TA/gK VIA A 4 INCH D1AMETER SEWER LINE. THE EFFLUENT THEN PASSES THROUGH F1LTERS LOCATED iN EACH SEPTIC TANK PRIOR TO BEING CONVEYED TO A SINGLE DOSING TANK VIA 8 INCH DIAMETER CLASS 200 PVC COLLECTION LINES. THE DOSING TANK HOUSES TWO SIPBONS WHICH ALTERNATELY DOSE FOUR DRAIN F1ELDS; ONE PAIR OF DRAIN FIELDS IS DOSED EACH CYCLE. A DOSE OF ROUGHLY 1060 GALLONS (3-5 CYCLES PER DAY) IS CONVEYED TO FLOW SPLITTERS ViA ONE OF TWO 6 1NCR DIAMETER LINES AT A MAXIMUM RATE OF 200 GPM. THE DOSE IS DIVIDED IN HALF AT A FLOW SPLITTER, AND 2-FOUR iNCH DIAMETER LINES DELIVER THE DOSE TO 10 LATERALS AT EACH DISPOSAL FIELD. EACh TWO 1NCh DIAMETER LATERAL OPERATES AT 10 GPM AND HAS A SERIES OE 1/8 INCH DIAMETER HOLES LOCATED ON ITS TOP SIDE WHICH PASS THE EFFLUENT TO THE DRAIN ROCK IN THE TRENCHES. THE TRENCHES ARE TOPPED WiTH FILTER CLOTH. THE DESIGN FLOWS ONLY APPROXIMATE REALITY AS MUCH SURGING WILL OCCUR AS A1R BUBBLES ESCAPE FROM THE SYSTEM DURING AN ACTIVE CYCLE. DESIGN CALCULATIONS THIS DISPOSAL SYSTEM WAS DESIGNED WiTH THE ASSISTANCE OF BOB FOSTER (}IARiON COUNTY SANITARIAN), GARY MESSER (STATE OF OREGON DEQ), AND HAROLD BALL (ORENCO SYSTEMS, INC.). FOURPLEX: THERE ARE TWO OF THESE BUILDINGS. DAILY FLOW 450 GPD X ~ UNITS = 1800 GPD MINIMUM WORKING CAPACITY OF TANK = 1125 + (0.75 X 1800) = 2475 GALLONS USE A 3000 GALLON TANK. DUPLEX DALLY FLOW 450 GPD X 2 UNITS = 900 GPD MINIMUM WORKING CAPACITY OF TANK = 900 X 1.5 = 1350 GALLONS. USE A 1500 GALLON TANK.