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ENClNEER: J~M BURRY 0Z-0~-87 PROJECT DF~SCR1PT1ON THIS PROJECT CONSISTS OF TWO FOURPLEX LIVING UNITS, ONE DUPLEX L~V~NG UNIT, AND A MESS ~ALL (EQUIVALENT TO A 20 SEAT RESTAURANT) W~ICH COLLECT1VLY GENERATE A DE.SIGN FLOW OF 5000 GPD OF SEWAGE. EACH BUILDING IS CONNECTED TO A SEPTIC TANK VIA A ~ INCH D1AMETEE SEWER L/NE. THE EFFLUENT THE~ PASSES THROUGH FILTERS LOCATED iN EACH S~PTIC TANK PRIOR TO BEiHG CONV~ED TO A SINGLE DOSING TA~ ~IA ~ INCH D1AMETER CLASS 200 PVC COLLECTION L~NES. THE DOSING TANE HOUSES TWO SIPHONS ~CH ALTER~NATELY DOSE FOUR DRAIN F1ELDS; ONE P~_IR OF DRAIN F~ELDs IS DOSED EACH CYCLE. A DOSE OF ROUGHLY 1060 GALLOWS (3-5 CYCLES PER DAY) IS CONVEYED TO FLOW SPLITTERS V1A ONE OF TWO 6 iNCH DIAMETER LiNES AT A MAXIMUM RATE OF 200 THE DOSE IS DIVIDED IN HALF AT A FLOW SPLITTER, AND 2-FOUR iNCH DIAMETER LINES DELIYER TEE DOSE TO 10 LATERALS AT EACH DISPOSAL FIELD, EACH TWO iNCh DIAMETER LATERAL OPERATES AT 10 C~PM AND HAS A SERIE~ OF 1/8 INCH DIA~ETE~ ROLES LOCATED O~ ITS TOP SIDE ~CH PA:~ THE EFFLUENT TO THE DRA/N ROCK IN THE TRENCHES, THE TRENCNuEE ARE TOPPED WiTH FILTE~ CLOTH. TEE DESIGN FLOWS ONLY APPNGXIMATE REALIT~ AS MUCH SUROIHG WILL OCCUR AS Ai~ BUBBLES ESCAPE FROM T~IE ~YST~DDR~NG AN ACTIVE CYCLE. DESIGN CALCULATIONS T~IS DISPOSAL SXSTEM WAS DESIGNED W1TH THE A~ISTANCE OF BOB FOSTER (~IARiON COUNTY SANITARIAN), GAR~ MESSER (STATE OF OREGON DEQ), AND HAROLD ~ALL (ORENCO SYSTEMS, INC.). FOURPnRY; THERE ARE TWO OF TF~F~SE B~ILDI~C~. DALLY FLOW ~50 C~PD X ~ UNITS = 1800 (~PD MINIMUM WORKING CAPACITY OF TANK = ~125 + (0.75 X 1800) = 2~75 GALLONS USE A 3000 GALLON TA~. DUPLEX DALLY FLOW ~50 OPD X 2 UNITS = 900 GPD MINIMUM WORKING CAPACITY OF TANK = 900 X 1.5 = 1350 GALLONS. USE A 1500 GALLON TA~,