HomeMy WebLinkAboutSWG2026-00124 - SWG Application / Design - 9/11/2026 MASON COUNTY 415 N 6TH STREET, 0427-9N,WA 98584
ASHELTON.360-427-9670,EXT 400
BELPAIR:360-275-4467,EXT 400
Public Health & Human Services ELMA:360482-5269,EXT 400
FAX 360-427-7787
On-Site Sewage System Permit: SWG2026-00124 CDUN(Y
APPLICANT DAVIS FAMILY ASSOCIATION Phone:
Address: MULLER;WILLOTT;PENTZ;DAVIS BAINBRIDGE ISLAND, WA 9811O-27O5
OWNER DAVIS FAMILY ASSOCIATION Phone:
Address: MULLER;WILLOTT;PENTZ;DAVIS BAINBRIDGE ISLAND, WA 9811O-27O5
SEPTIC DESIGNER CINDY WAITE" Phone: 36O-7O1-O2O5
Address: 80 E PICKERING LANE SHELTON,WA 98584
SEPTIC INSTALLER TAYLOR TONEY' Phone: 36O-489-9169
Address: 2971 E PHILLIPS LAKE RD SHELTON, WA 98584
Site Address: 111 E BIG SKOOKUM RD
Primary Parcel Number: 220207500060
Permit Description: Repair/Upgrade to 5bd OscarXO2
Permit Submitted Date'. 04/24/2026
Permit Issued Date: 09/11/2026
Issued By: Rhonda Thompson
Current Permit Fees Paid: $845.00 (additional feeslrlay be required upon installation of system)
Permit Expiration Date: 05/01/2027 based or dale m inspeamm
Permit Conditions:
I Approval of this septic permit does not approve the building location. Building location is
subject to approval from all applicable departments and regulations.
2 Proposed development subject to zoning requirements and approval by the planning
department staff per Mason County Title 17.
3 Permit must be installed by a Mason County Certified Installer unless prior written
authorization from Mason County is obtained.
4 Grainfield installation not to exceed designed upslope and downslope depth specified on
design form.
5 Installer is responsible for obtaining Mason County installation approval prior to backfill of
system components.
6 Installer is responsible for obtaining Septic Designer/Engineer installation approval prior to
backfill of system components.
7 Mason County Asbuilt Form, Record Drawing, and installation fee must be submitted for
final installation approval.
THIS PERMIT MUST BE ONSITE DURING INSTALLATION OF OSS.
PROPERTY OWNERS ARE RESPONSIBLE FOR DETERMINING AND MARKING ALL PROPERTY LINE AND EASEMENT LOCATIONS.
THIS PERMIT MAY BE REVOKED IF THE SITE CONDITIONS HAVE CHANGED SINCE THE SITE WAS INSPECTED AND DESIGN APPROVED.
FINAL INSTALLATION APPROVAL IS REQUIRED PRIOR TO TEMPORARY OR FINAL OCCUPANCY OF ANY RELATED STRUCTURES.
For Final Inspection visit: masoncountywa.gov/health/environmental/onsite/oss-inspection-request.php or call:
360-427-9670, extension 400.
OFFICIAL USE ONLY —
MASON COUNTY C >
AMOUNT RECEVra Im m CO
Public Health & Human Services DE.%Y ° m
< N
Enoi,anmenal Health 360>➢-9670,eIt 400 01 360275,4X67,1.1 400SWG COO
415 N oth Street-Shelton,WA 99584 , o� I - — c c i ; z y
ON-SITE SEWAGE SYSTEM APPLICATION 3
m
APPLICANT HONE
DAVIS FAMILY ASSOC/B-LINE CONST I 360-426-4221 c
MAILING ADDRESS STREET.CR`1 SATE ZIP CODE Ca
359 GIDEON LANE NW %AINBRIDGE ISL WA 98110 z
111E BIG SKOOKUM RI
.l(_SITE ADDRESS-STREEr CITY ZIO CODE c_i C� ELTON WA 98584 ^'
FAME OF DESIGNER P NE
CINDY WAITE ty�� 2-701-0205
NAME OF INSTALLER 'HONE O I O
B-LINE CONSTRUCTION B"I 360-426-4221 o- f°vy-116ti ≤
y I N
PERMIT TYPE(sect one) DPI RI NGAATER SOURCE O
F C RESIDENTIAL 1.! COMMUNITY 055 1hCOMMERCIALOSS ❑ PRIVATE INDIVIDUAL WELL b PRIVATE TWO-PARTY WELL Z
a PUBLIC WATER SYSTEM
TYPE OF KORR lPpIOI one;
h NEW CONSTRUCT! /UPGRADES REPAIR I REPLACEMENT OTTER DETA L5(select 80!ar apply) 0 TABLE X REPAIR
O SURFACING SEWAGE ❑ EXISTING FAILURE D SHORELINE
SUBMITTALS
p O
Iq DESIGN FORM(REQUIRED) SEPTIC DESIGN(REQUIRED) BEDROOM5� LOT 52E O LOT CREATED AFTER
BED _
n
EWAIVER(sI OF APPLICABLE)
3 ❑ YES ❑ NO o
DIRECT ONE 10 SITE AND SITE CONDITONS 'x NOG!Pale)
TAKE HIGHWAY 3, TURN RIGHT ON AGATE ROAD, TURN RIGHT ONTO BENSON
LOOP ROAD, TAKE FIRST RIGHT ONTO BENSON LOOP ROAD, TURN RIGHT ONTO r I a
BIG SKOOKUM RD. PARCEL IS ON THE RIGHT SIDE OF ROAD. SOIL LOGS ARE -,
NEXT TO BIG SKOOKUM RD, RESIDENCE IS DOWN ON THE WATER. I rn
SITE MUSTBE F(i1GGED FROM MAIN ROAD AND TEST HOLES MUSTSE FIAGGEO MTH TEST HOLE NUMBERS. I O
- OFFICIAL USE ONLY BELOW THIS LINE
UPGRADE)FAILURE SOURCE ITC,repoeln9 purposes)
❑VOLUNTARY []MAINTENANCE/PUMPING O BUILDING PERMIT OH0ME SALE ❑COMPLAINT O0THER._
INSPECTOR SOIL LOGS COMMENTS;D0NDIT.ONS
Z: O .3Z Si LL ( tot vd ' to
I : S CL 4rvu d
v/
S�II A+ � O RECORD DRAwN6ANo INSTALLATION REP RI
SOIL CODES:
V=VERY G=CRAVELV 5=SAND L=LOAM SI=SILT C=CLAY E-EXTREMELY R=ROOTS REQUIRED FOR FlVALAFPROVAL
A5PEOTOR SIGNATURE SATE APPLICATION EXPIRATION DATE APPLICATION APPROVED]ZSUED BY �l Z9E
SIB �I I Iz�
THIS FORM MAYBE SCANNED AND AVAILABLE FOR PUBLIC VIEW ON THE MASON COUNTY WEBSITE RevIse1 411412025
DESIGN FORM—PAGE ONE Assessor's Parcel Number: 2 2 0 2 0 7 5 0 0 0 6 0
A design will be reviewed when 3 copies of each of the following are submitted:
v Completed design form that has been signed and dated. v Scaled layout sketch,including all applicable items on checklist.
v Scaled plot plan,including all applicable items on checklist. v Cross-section sketch, including all applicable items on checklist.
This forte may be scanned and available for public view on the Mown counw Web site,Macimam r size: 11"X 17"
F PARCEL IDENTIFICATION
Permit Nurnber: SWG DQtq ooi .4 Designer's Name: CINDY WAITE
Applicant's Name: DAVIS FAMILY ASSOCB-LINE Designer's Phone Number: 360-701-0205
Mailing Address: 359 GIDEON LANE NW Designer's Address: 80 E PICKERING LANE
BAINBRIDGE ISL WA 98110 City State Zip SHELTON WA 98584
City State Zip Designers Email cindyawalte®msn.com
I DESIGN PARAMETERS
Treatment Device
❑Glendon ❑Sand Filter ❑Mound ❑Sand Lined Drainfield ❑Recirculating Filler ❑ATU ❑Other XO2
Treatment Level(check all that apply): 'A 18 IC lBLI 181.2 181,2 IE ❑N
Drainfield Type
❑Gravity ❑Pressure Cl Trench ❑Bed O Sub Surface Drip
Septic Tank/Drainfeld Specifications Laterals
Number of Bedrooms 5 Schedule/Class NETAFIM
Daily Flow:Operating Capacity 450 gpd Length 50 ft
Daily Flow; Design Flow 000 Spd Diameter in
Septic Tank Capacity(working) 1500 gal Number 5
Receiving Soil Type(1-6) 5 Separation .5 ft
Receiving Soil Appl.Rate .4 gpd/ft' Orifices
Required Primary Area 1593 ft2 Total Nu f Orifices 10X50=500
Designed Primary Area 1500 ft Diamet EMITTER in
Designed Reserve Area 4s 5b( ft° Spec' CvR ' , .5 in
Trench/Bed Width 59 ft �'°3;`iJs�4 Manifold
Trench/Bed Length 27 ft ul ar �la�SCHEDULE 40
Elevation Measurements lit Stnne tar SUPPLY- Y2�,RENRN ft
Dr E
Original Drainfield Area Slope <1 % imtna DESI 1.25 in
New Slope.If Altered % C n used? D Yea gNo
Depth of Excavation Up-slope 0 in Transport Pipe
from Original Grade Down-slope 0 in Schedule/Class
Designed Vertical Separation 12"+ in Length ft
Gravel-based Drainfield Required? O Yes O No Diameter in
Pump Required? 16 Yes O No Dosing and Pump Chamber
Pump/Siphon Specifications Number of doses/day 360
Diff.in Elevation Between Pump&Uppermost Orifice_ft Dose quantity 1.28 gal
Drainfield Squirt Height/Selected Residual(head) _ft Chamber Capacity(flood) 2004 gal
Uppermost Orifice Cl Higher O Lower than Pump Shutoff Pump controls:Please check those required.
Capacity @ Total Pressure Head gpm Ef Timer lid Elapse Meter I1 Event Counter
Calculated Total Pressure Head 81.82 ft If Timer. Pump on 22 SEC ,pump off l M r✓3Phvs
Comments I 1
STAKE OUT DRAINFIELD AFTER CAREFUL CLEARING, VERIFY LIFT FROM PUMP TANK TO
OSCARS,
Revised:6/11/2025
DESIGN FORM—PAGE TWO Assessor's Parcel Number: 2 2 0 2 0 7 5 0 0 0 6 0
PermitNumber: SWG CJ( -,- O1a`f
DESIGN CHECKLISTS
Scaled Plot Plan Scaled Layout Sketch Cross-Section Sketch
El'Test hole locations .W Drainfield orientation and layout Reference depth from original grade:
O' Soil logs m Trench/bed dimensions and M'Septic tank
Property lines critical distances within layout W"Drainfield cover
Existing and proposed wells 0-Box/Valve box locations Reference depth from original grade
within 100 ft of property Septic tank/pump chamber and restvictive strata:
21 Measurements to cuts,banks,and locations P /- < mw
Laterals,trench/bed,top and
surface water and critical areas 'Observation port location bottom
Location and orientation of 611 dean-out location 0 Curtain drain collector
curtain drain and all absorption ®'Manifold placement ❑ Sand augmentation
components
E(Orifice placement Other q055-section detail:
2'Location and dimension of
primary system and reserve area Lateral placement with distance Observation ports/clean-outs
to edge of bed
'Buildings Other Information
Audible/visual alarm referenced Yes No
Direction of slope indicator l 'Scale of drawing shown on scale ii ❑ Design staked out
IiI'Waterlines ,.,/bar ❑ ❑ Recorded Notices attached
1a
Q7"Roads,easements,driveways, Elevation benchmark and relative ❑ ❑ Waiver(s)attached
parking elevations of system components lI ❑ Pump curve attached
f1Y North arrow and scale drawing 0 ❑ Evaluation of failure
shown on scale bar Nen-residentialjustification
❑ ❑ Waste strength
❑ ❑ Flow
DESIGN APPROVAL
The undersigned designer must be notifi by installer at time of installation Yes ❑ No
_ Z L-4 %,
Signature f Designer Date
The undersigned has reviewed this design on behalf of Mason County Public Health and determined it to he in
compliance with state and local on-site regulations:
Environmental Health Specialist Date
CAUTION: DESIGN APPROVAL IS VALID ONLY UNDER THE FOLLOWING CONDITION:
✓ The design is stamped"Approved"by Mason County Public Health. �[I Iz-7
'' The Onsite Sewage Permit has not expired,the Permit Expiration Date is:
✓ Drainfield site conditions have not been altered to adversely affect conditions of design approval.
Please Note: The system must be installed by a certified installer,
unless prior authorization is obtained from Mason County Public Health.
An Installation Fee is required. r�
This form may be scanned and available for public view on the Mason County Web site. Revised:6/I I/2025v\,
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Headworks:
There are two options for headworks with the OSCAR-XO2 system. The
original X02 kit has the automatic reverse flush headworks while the new version
XO2M kit has a manual headworks (see appendix). There are no solenoid valves in
the X02M kit.
TABLE a�
Hydraulic Layout
OS-50 coils
�4 4 1 1.4 7.8 50'
ID!' 5 5 1 1.75 9.75 50'
• 61 3 2 2.1 6.2 50'
r 8 4 2 2.8 9.2 50'
8 4 2 2.8 9.2 50'
• � r 10' 5 2 3.5 11.5 50' e
TABLE 3 Hydraulic Layout � .P77; 1J'"'s
OS-100 coils 5
• ' , ®®______ rte
GNER
�21 2 1 1.4 4.6 50'
3' 3 1 2.1 6.9 50'
r 411 4 1 2.8 9,2 50'
I ' 5 5 1 3.5 11.5 50' (Q
TABLE 4
Minimum Shoulder Lengths
OS-50
•. -
240 I 22.5
300 28
360 33.5
480 44.5
600 55.5
The dimensions in Table 4 represent the minimum required length of the outer
shoulder which include coils, spacing between coils, and shoulders. These lengths
can be extended to match site conditions. Minimum shoulder spacing and spacing
between coils is 6 inches. See illustration below for example of shoulder length.
TABLE 5
Minimum Shoulder Lengths
OS-100
240 F 14' 2 Inches
360 21' 4 inches
480 F 28' 4 Inches
600 35' 5 inches
The dimensions in Table 5 represent the minimum required length of th houlder
which include coils, spacing between coils, and shoulder. These LengtIjQtbe
extended to match site conditions. Minimum shoulder spacing is 6 in s.
illustration below for example of shoulder length. P ape
Basal Area: y � NA
The basal area is comprised of the total area where' -Lt sdnd,m" �a is
in contact with the receiving soil. The minimum required basal areai3caltdt
by dividing the design flow rate by the soil loading rate specified in WAC 246-272A
(Local codes may have differing loading rates).
, 1�
F=L(Q/KO)^1.85
CALCUUATIQN
F=friction loss through pipe I feet of head DO NOTCHANGE
L=Iength of supply line in feet FILL IN
Q=Flush GPM
K=47.8 (1'SCHEDULE 40)
LENGTH 200 I4( SL4MIC '{�
Q FLUSH GPM __ 8
K (1"SCHEDULEN40) 98.5
FRICTION LOSS 1.922602
TDH _ _ 1.922602
TOTAL HEAD
FRICTION LOSS 1.922602
ELEVATION FROM PUMP
TANK TO OSCAR 50
TOTAL HEAD 51.9226 <50 EXCESS TDH
GMP DISCHARGE AT DF
EMITTER GPH 0.42 .42 GALLONS PER EMITTER PER HOUR
MINUTES PER HOUR 60
# EMITTERS 50
#COILS 10
GPM PER COIL 0.35
GPM PER TOTAL COILS 3.5 w ^ Nr
DOSEVOLUME s
GPMPERCOIL
COILS 10 , tV.
SECONDS IN MINUTES 60
SECONDS ON 22
GALLONS PER DOSE 1.28
CALCULATION
TIMER SETTING DO NOT CHANGE
TIME OFF SECONDS 218 3 MIN 38 SEC
TIMER ON SECONDS _ 22 22 SEC
TIMER SETTINGS GPD 184 FILL IN
GP DOSE 1.28
DOSES PER DAY 360
GPD 462 OK
4 ��
Tanks for a 500 gpd design = 1,000 gallons
A 7 bedroom design (120 gpd x 7) is 840 gpd.
840 gpd/500 gpd = 1.68 or 68% increase
Minimum tank size for 840 gpd = 1,000 gal. x 1.68 = 1,680 gallons
Therefore, a 1750 gallon, two compartment tank can be used.
For tanks with water tight, structurally sound partitions: for both the
treatment tank and discharge tank a double compartment tank with tee baffles
can be used (no flow through ports). Flip the discharge tank around so the smaller
compartment is first as shown (see Illustration 2). The clarifier Chamber is to
remain full.
vEMTfiLt
)5
0° a2 ero
Illustration 2
As the daily design flow rates increase, larger tanks will be needed. It ma �.
become necessary to have individual tanks for each chamber or a combination '&
tanks to meet the volume requirements. For example:
s ^h
3 Y
3.000 god design flow (refer to Table 1-21.
Septic chamber = 4000 gal. needed, use a 3000 gal. tank + 1000
Aeration Chamber = 2-1000 gal. tanks.
Clarifier chamber = 2- 1000 gal. tanks.
Pump chamber = 3000 gal. tank + 1000 gal. tank.
In this example, the septic chambers could be connected using standard tee
baffles making a two compartment chamber. The aerator chamber could be
arranged the same as the septic chambers. Half of the diffusors would be placed in �1t g
1500SR & 1500SR-HW
128"
----------- ---- ---
79 � � 41 " �
LT
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€ 24
0116
NTOP VIEW iI 72
Sep/ic w
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:. jl ryGp_e A'.cJ �
24 LflENCO TAKK ADMTEfl6
4' UST-A-SEAL GASKET
— 4' PVC BAFFLE
4
FLOOD cAv. �zaa GALA FL000 cor. 65"
T B2) GALS.
55- 1 /2 53
30• '
3 `
2- 1 /2 \ S
APPROX. WEIGHT 12.000 LBS.
2250SR & 2250SR-HW
137"
96- 1 /2- -------
32- t /2"
2a18" 24"
TOP VIEW90"
84"
4
�ar/ y�Ip Gh•Im62 � i i
i � i �42.6��1
--------- ------1� — —
3„
2!' ORENCO T Ht ADAPTERS
TIC
4 CAST-A-SEAL GASFET
4 PVC BAFFLE 4
4I
FLOOD P. 2001 as. —1 ROCU �' 8
BIT GAL5. 68"
�P �
58" sP 56"
GIND�WAITE
LICENSED DESIGN R
+ups os,Iv
__J
2- 1 /2 H H
3" \tp
APPROX. WEIGHT 16,500 LBS. 1'
each 1,000 aeration chamber. The clarifier chambers could either use tee baffles
or be connected together below the liquid level. The combined pump chambers
must be connected below the liquid Level.
Table 1-2"'
1 AKOOM, ffta°' "Puna /�at ara 8ggg061 .
4 ,
500 gpd 670 330 330 670 1 1,000 gal.treatment, 1,000 gal.discharge
750 gpd 1,000 500 1,000 500 2 1,500 treatment, 1,500 discharge
1500 gpd 2,010 990 990 2,010 3 3,000 treatment,3,000 discharge
2000 gpd 2,680 1,320 1,320 2,680 4 3k&1500 treatment&3k&1500 discharge
2250 gpd 3,000 1,500 1,500 3,000 5 3k& 1500 treatment&3k&1500 discharge
3,000 gpd 4,000 2.000 2,000 4,000 6 use multiple tanks to meet volume needs
3,500 gpd 4,700 2,310 2,310 4,700 7 use multiple tanks to meet volume needs
`Minimum liquid volume needed.
**Local health jurisdictions may require larger tank volumes.
*Table 1.2 is a quick reference guide.
Aerator:
For each 500 gpd design flow one aerator will be needed. Round up the
design flow to the next 500 gpd value. For instance, a 600 gpd design flow will
need 2 aerators (600 gal. rounded up to 1000 gal. needs 2 aerators).
The aerator box must be installed so that the bottom of the aerator box is
at the same elevation or higher than the top of the tank risers, see Illustration 3.
If the site is sloped the aerator box can be buried, upslope from the tanks. The
sides of the aerator box lid must not be buried. Aerators can be installed up to
several hundred feet away from the diffusors. The line between aerator and
diffusors must slope toward diffusors.
Aesthetic concerns should be considered when placing the aerator box.
Place the aerator away from house windows, doors, and areas where people to d
to congregate, such as patios areas and barbecues.
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LICEN D DEDE �iON ER
Illustration 3
Headworks, manual flush: HWN-.7-man
• '/4 inches Arkat disc filter, mesh, 130
micron
• 3/, inches Arad flow meter
• Three oil fitted pressure gauges (0-100
psi)
• One 1 inch Spears gate valve for
flushing.
OSCAR-X02 Parts list (500 gpd).
Each OSCAR-XOz unit will include:
• LF1 P-RF-ARA control panel
• LOT-30, 1/2 hp, 120 volt pump
• Hi-Blow Aerator, HB-80 (80 liter/minute) --Z
• Hi-Blow diffusers
• 05-50 or 05-100 Coils
• PVC fittings and drip tubing adapters
• HWN-.7-RF automatic headworks
• Solid 1/2 inches poly tubing for connections
• 2 float switches
OSCAR-XO2M Parts list (500 gpd).
Each OSCAR-X02 unit will include:
• LF1 P-RF-ARA control panel
• LOT-30, 1/2 hp, 120 volt pump
• Hi-Blow Aerator, HB-80 (80 liter/minute)
• Hi-Blow diffusers
• OS-50 or OS-100 Coils o 5 sin, ,F Nam
• PVC fittings and drip tubing adapters c;AITE 4tk
• HWN-.7-RF-man G� e .crveR
• Solid 'h inches poly tubing for connections
• 2 float switches 3
OSCAR-X02+1 Parts list (501-1,000 gpd).
Each OSCAR-X02+1 unit will include:
• LF1 P-IF-ARA control panel
• LOT-30, 1/2 hp, 120 volt pump
• Hi-BlowAerator2 (2), XB-80 (80 liter/minute)
• Hi-Blow diffusers (4)
• OS-50 or OS-100 Coils
• PVC fittings and drip tubing adapters
• HWN-.7-RF automatic headworks
• Solid ½ inches poly tubing for connections
• 2 float switches
OSCAR-X02 colt Connections
Manifolds and supply lines are 1 inches Sch 40 PVC
�V q
p2 CINCV C WgITE ��+'
UC F SF^OFaONER
Manifold and blank tech line adapter and connection.
Blank tech liner and Bioline connection with internal coupling
Inspection ports. . .
_>E Screw Type Cap
or Slip Cap ..-- < Screw Type Cap
or Slip Cap
t-4"PVC Pipe
F4"PVC Pipe (Length Varla)
(Length Varies)
14 r 4"Lone
_ -•� t Slots(4)@90*Apart
Toilet Ring
4"PVC T.
OSCAR Cover Options. , y1 _. j � UER =�
There may be a desire to cover the OSCAR with something additonat to the- -
specified ASTM C-33 sand. The intent is not to have too much additional cover over
the final C-33 sand layer that would prevent the sand from accessing oxygen from
the atmosphere. Placing too much cover will inhibit plant root growth. Because
the C-33 sand is sub-surface irrigated, grass and other ground cover will grow C 11 $
rapidly, forming a firm protective cover over the OSCAR. At the end of the first
growing season the C-33 sand layer will be as firm as native soil to walk on.
Options include:
• Landscaping jute mat with grass seed or ground cover plantings
• A thin layer of mineral soil low in organic content (<10% organics)
• Thin layer of crushed or washed rock for wind erosion protection.
• Thin layer of bark to wood chips.
• Aggregates the size of rip-rap (5-6 inch diameter) can be "placed" on the OSCAR
for protection from deer or elk traffic. These Larger sized aggregates must be
placed, not dropped, on the OSCAR to prevent breakage of piping and other
materials.
• Wire mess can be installed over the sand to prevent erosion and allow for grass
to grow.
Do Not Cover C-33 Sand with:
• organic mix (manufactured top soil from compost)
• filter fabric
LOT-30 pump curve:
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Installation Notes
Oscar-XO2 Treatment System
111E Big Skookum Rd 22020-75-00060
1. The prepared site plan is not a survey. It's the owner's responsibility to verity property
lines, utility lines (water, sewer, power, phone and gas) prior to installation.
2. Verify lift from tanks to Oscars prior to installing transport line.
3. This is a repair for a three bedroom system with Install approval In 1981. Design is
for a five bedrooms conforming drainfield and reserve,
4. Owner must string the east property line prior to Installation.
5. Installer responsible to contact designer prior to installation.
6. Installer responsible to submit installation form to designer with a plot map, tank
information, pump information and any changes from the original design.
7. Oscar drainfield: ASTM C-33 sand media as per Washington Department of Health's
Recommended Standards and Guidance for Intermittent Sand Filter.
8. All new lines in the driveway must be cased.
9. Two aerators required
10. Minimum of 6" of sand throughout out the lateral(coil) area, must be level.
11. Oscar X02 parts list on Page 13
12. Controls to be set per XO2 guidelines
13. Septic tank location must meet all required setbacks.
14. Keep wheeled vehicles off the drainfield area before, during and after installation.
15. Tracked equipment only
16. All ground, surface water and roof drains must be diverted away from the septic tanks and
drainfield.
17. Ensure the final grade slopes away from these areas and water doesn't collect on or
around them. Use swales, berms, catch basin and tight lines, curtain drains, etc. to divert
all waters
18. Curtain drains can be no closer than 10' upgradient and 30' down gradient of the drainfield
19. Exposed restrictive layers, cuts, banks, etc. can be no closer than 50' downhill from the
drainfield.
20. Install access risers on all tanks, valve box and ends of laterals.
21. Make sure septic tank risers are epoxied or caulked to cast in riser rings on tank.
22. Lids must form a water and gas tight seal with the access risers.
23. This system must be installed by a Mason County Certified installer.
24. Deviation from this design without prior approval from the designer and Mason County
Health Department will make this design null and void.
25. This design was sized per Washington Administrative CodeWAC246-272A-0230. The
operating capacity is based on 45 gallons per day per capita with two persons per
bedroom. The minimum design flow per bedroom per day the operating capacity of
ninety gallons multiplied by 1.33. This results in a minim sign flow of one hundred
twenty gallons per day. This creates a surge factor of b nticipated flow is ninety
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System Owner Responsibilities:
1. Owner or installer responsible for payment of installation permit prior to starting
install.
2. Operation and Maintenance is required by Washington State Department of Health and
Mason County Health Department.
3. The septic tank and pump tank should be pumped every three to five years or as
needed.
4. System owners are responsible for having maintenance performed annually.
5. System owners are responsible for responding to septic issues in a timely manner.
6. System owners shall not at any time change or alter settings in the control box.
7. System owner agrees to read and abide by information regarding their system in the
User Manual provided by Mason County Public Health.
8. Keep the flow of sewage at or below the approved design operating capacity.
9. Leaky plumbing can hydraulic overload your on-site septic system
10. Keep waste strength at residential waste strength parameters.
11. Spread loads of laundry through the week.
12. Do not use excessive bleach or detergents with added whiteners.
13. Do not shower, do laundry and dishwasher at the same time
14. Antibiotics can kill or impair the biological process in the septic tank.
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