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2011 purpiecode Mound Design <br /> www.SepticResource.com (vers 15.2) <br /> Property Owner: NOR-SON Date: 1/12/2017 <br /> Site Address: 540 Willow Drive S. PID: 0311723320018 <br /> Comments: <br /> instructions: t i =enter data =adjust if desired = computer calculated - DO NOT CHANGE! <br /> I i bedroom Type Residential System <br /> 2) 750 GPD design flow <br /> 3) Yes Garbage disposal or pumped to septic 50%larger tank with multiple comp/tanks <br /> 2250 Gal Septic tank (code minimum) 12250 JGal Septic tank (design size / LUG req'd) <br /> Tank options: none <br /> s) 1.2 GPD/ft2 mound sand loading rate contour loading rate of 12 req's a min 62.5 ft. long rockbed <br /> e� 10.0 ft rockbed width 62.5 ft rockbed length <br /> » 3.0 ft lateral spacing 3.0 ft perforation spacing (maximum of 3 for both) <br /> end feed manifold connection <br /> 8) laterals 60.5 feet long 21.0 perfs / lateral 63 perfs total <br /> (1/2 a pert means the first pert starts at the middle feed manifold) <br /> 7/32 inch perfs at =feet residual head gives 0.56 gpm flow rate per perforation <br /> 771 for this pert size ft spacing, ii pipe size on line 12, max perfs/lateral = r 30 , line#8 must be less OK <br /> 10) 4.0 doses per day (4 minimum) <br /> iii 188 gallons per dose (treatment volume) <br /> 2.00 5x <br /> 12) 2.00 inch diameter laterals must be used to meet"4x pipe volume"requirement <br /> 2.00 3x <br /> 13) 150 feet of 2.0 inch supply line leads to 26 gallons of drainback volume <br /> (Tip: "top feed"manifold to control the drainback) <br /> 141 214 gallons TOTAL pump out volume(treatment+drainback) <br /> i s i 21 feet vertical lift from pump to mound laterals, leads to a: <br /> ie� 36 GPM @ =feet of head, Pump requirement (note: >50gpm may require an extra 3-6'of head) <br /> 17) 750 gal Dose tank (code minimum) 1300 gal Dose tank (design size / LUG regd) at 25.49 gpi <br /> leads to a <br /> 18) 8.4 inch swing on Demand float, or timed dosing of 5.9 min ON (confirm pump rate with drawdown <br /> (this delivers Average flow, =70%of Peak design flow) <br /> ehrs OFF test and adjust as necessary) <br /> ie� 12 inches from bottom of tank to"Pump OFF"float <br /> 20: 20 inches from bottom of tank to"Pump ON"float,orF12 inches to"Timer ON"float if time dosed <br /> 21) 23 inches from bottom of tank to"Hi Level"float, or 33 inches to"Hi Levet"float if time dosed <br /> 221 =gallons reserve capacity (after High Level Alarm is activated) <br />