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• <br /> 2011 purple code Mound Design <br /> www.SepticResource com (vers 15.2) <br /> Property Owner: Kathryn Bode Date: 7/19/2016 <br /> Site Address: 960 Willow Drive N. PID: 2711823330011 <br /> Comments: The design shows for a new system. We are reptaceing Rock bed. <br /> instructions: =enter data =adjust if desired = computer calculated - DO NOT CHANGE! <br /> I) 4 bedroom Type I Residential System <br /> 600 GPD design flow <br /> Yes Garbage disposal or pumped to septic 50% larger tank with multiple comp/tanks <br /> 4, 2250 Gal Septic tank (code minimum) 2250 Gal Septic tank (design size / LUG req'd) <br /> Tank options: none <br /> 1.2 GPD/ft2 mound sand loading rate contour loading rate of 12 req's a min 50 ft. long rockbed <br /> 6) 10.0 ft rockbed width 50.0 ft rockbed length <br /> r 3.0 ft lateral spacing 3.0 ft perforation spacing (maximum of 3 for both) <br /> end feed manifold connection <br /> g, 3 laterals 48.0 feet tong 17.0 perfs / lateral 51 perfs total <br /> (1/2 a perf means the first perf starts at the middle feed manifold) <br /> +, 1/4" inch perfs at 1 feet residual head gives 0.74 gpm flow rate per perforation <br /> for this perf size Et spacing, Et pipe size on line 12, max perfs/lateral= 25 , line#8 must be less --> <br /> 10, 4.0 doses per day ( 4 minimum) <br /> 11, 150 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 /> 13r 30 feet of 2.0 inch supply tine leads to 5 gallons of drainback volume <br /> (Tip: "top feed" manifold to control the drainback) <br /> 141 155 gallons TOTAL pump out volume (treatment+ drainback) <br /> 10 feet vertical lift from pump to mound laterals, leads to a: <br /> 16, 38 GPM @ 17 feet of head, Pump requirement (note: >50gpm may require an extra 3-6'of head) <br /> 17) 500 gal Dose tank (code minimum) 1000 gat Dose tank (design size / LUG req'd) at 25.00 gpi <br /> leads to a <br /> is, 6.2 inch swing on Demand float, or timed dosing of 4.1 min ON (confirm pump rate with drawdown <br /> (this delivers Average flow, =70%of Peak design flow) 9 hrs OFF test and adjust as necessary) <br /> 19, 12 inches from bottom of tank to"Pump OFF"float <br /> z, 18 inches from bottom of tank to"Pump ON"float, or 12 inches to'Timer ON"float if time dosed <br /> 21 r 21 inches from bottom of tank to"Hi Level"float, or 31 inches to"Hi Level"float if time dosed <br /> 22; 475 gallons reserve capacity (after High Level Alarm is activated) <br />