15-104826ON -SITE SEWAGE DISPOSAL SYSTEM
KING COUNTY
TAX PARCEL #
LEGAL DESCRIPTION: SEE ATTACHED
I. PROJECT
To construct a 3-bedroom single-family residence. Water supply is a source.
Soils appear to support a low pressure distribution drainfield.
II. TANKS
The tank specified is an approved 1500-gallon two -compartment concrete tank. The
septic tank will be watertight and have locking risers extending to grade. The pump
tank will be a 1500-gallon single compartment concrete tank. The pump tank will have
a locking riser extending to grade. The pump will be mounted and fitted so it can be
easily removed and remounted without removing the float switches. Conduct watertight
testing of all tanks, test to consist of 24-hour standing head test. No leakage is
acceptable.
No garbage grinder —if a garbage grinder is desired, the minimum septic tank capacity
shall be 1750 gallons.
Ill. AS -BUILT
Pre -installation inspection, as -built inspection, pressure test final cover inspection and
other required as -built materials have not been paid as part of this design l2ackage. All
additional inspections, field work, or other services required by the designer shall be
completed at an additional cost. Payment in full is required prior to release of the
installation permit.
IV. PRESSURE DISTRIBUTION DRAINFIELD
Daily Design Flow = 450 gal/day
All piping materials are to be Class 200 PVC
Transport line and manifold = 2" Class 200 PVC (feeder lines 1.25" Class 200 PV
S` Laterals =1.25" Class 200 PVC
- Soil type: 3 Application rate = g/ftz/day P
7& , Trench width: 3 feet `
Total lineal feet: " ""' lineal feet
ti
I Orifice spacing selected: feet on center 5100122
Orifice size: 3/16" n++vin V. ait1A�21!
Orifice flow with 2' residual head = .59 gpm x . a 1 Lr
Flow calculations
# of laterals highest lateral length # of orifices lateral flow (gpm) Total
at this length elevation 3' on center .59 x # orifices Flow
92" 114 12.4 37.2gpm
-75
Friction calculations
Constant for 1.25" Class 200 PVC= 122.9
Laterals = [lateral length (gpm lateral / constant)'-85] # laterals
63'+16 = 79' @ 12.4 gpm = 1.1'
Manifold / trans ort line headloss
ITEM QUANTITY EQUIVALENT PIPE LENGTH
2" PIPE 45' 45'
2" 90 ELL 1 6'
2" CK. VALVE 1 18'
2" TEE BRANCH 1 16'
2" UNION 1 1'
Total 86'
Constant for 2" Class 200 PVC = 315.2
Manifold / transport headloss = 1.7'
TDH = residual pressure + trans ort/manifold/fittln s + laterals + static elevation
TDH = 2' + 1.7' +1.1' + 6'
TDH = 10.8'
The pump to the drainfield must be capable of providing 37.2 gpm @ 10.8' of head.
The pump selected is a Hydromatic SP-50 effluent pump (115v, single phase, Y2 HP)
V.CONTROL PANEL
The system must be equipped with a free-standing electrical control panel that is
weather -tight and suitable for outside installation. The panel must have an audio and a
visual high level alarm. All electrical wiring must be done in accordance with
manufacturer's specifications. The panel must be a time controlled panel and will be set
for -ir doses per day.
The flow rate to the drainfield is 37.2 gpm, the time cycle must be:
Dose volume = 5 manifold + laterals + transport pipe
Dose volume = 5(1.5 + 17.3) + 9
= 103 gal/dose min
The timer will be set to dose 112.5 gallons four times daily
112.5 / 37= 3 minutes "on" and 6 hours 'off's ,
J
DAVID V. 44L)ARD
SOIL LOGS 8-29-1 r
SLA 04" SOD, 4-14" LIGHT BROWN LOAMY SAND (TYPE3)S� RAY GRAVELY
MEDIUM/COARSE SANDS AND GRAVELS (TYPE 2).
SL-2 0-14" FILL, 14-24" LIGHT BROWN LOAMY SAND (TYPE3), 4-S + GRAY GRAVELY
MEDIUM/COARSE SIDS AND GRAVELS (TYPE 2).
SL-3 0-23" FILL, 2.3-44",,LIGHT BROWN LOAMY SAND (TYPE3)r 44-72"+ GRAY GRAVELY
MEDIUM/COARSE.SANDS AND GRAVELS (TYPE 2).
SL-4 0-16" FILL, 16-36" LIGHT BROWN LOAMY SAND (TYPE4 36r72"-i-'GRAY GRAVELY
MEDIUM/COARSE-SANDS AND GRAVELS (TYPE 2).
SL-5 0-16" FILL, 16-32" LIGHT BROWN LOAMY SAND (TYPE4), 32 72"+ RAY GRAVELY
MEDIUM/COARSE SANDS AND GRAVELS (TYPE 2).
510Q122
5AVID V. HUARD
OWNER
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TEL. 255 532 4650
TAX ACCOUNT #
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FEDERAL WAY, WA 48025
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