HomeMy WebLinkAboutSWG2025-00420 - SWG Application / Design - 10/14/2025 at : MASON COUNTY 415 N 6TH STREET,SHELTON,WA 98584
SHELTON:360-427-9670,EXT 400
BELFAIR:360-275-4467,EXT 400
Public Health & Human Services ELMA:360-482-5269,EXT 400
FAX:360-427-7787
On-Site Sewage System Permit: SWG2025-00420
APPLICANT DAHL PROPERTIES LLC Phone: 1.360.740.0345
Address: 261 HAMILTON RD N CHEHALIS, WA 98532
OWNER DAHL PROPERTIES LLC Phone: 1.360.740.0345
Address: 261 HAMILTON RD N CHEHALIS, WA 98532
SEPTIC DESIGNER ADAM HUNTER* Phone: 360-753-1226
Address: PO Box 162 OLYMPIA, WA 98507
SEPTIC INSTALLER ANDREW LEHMAN* Phone: 360-470-4914
Address: 282 FULLER RD SALKUM, WA 98582
Site Address: W Highland Rd
Primary Parcel Number: 520241350010
Permit Description: New 4BR SFR - Pressure
Permit Submitted Date: 10/14/2025
Permit Issued Date: 01/21/2026
Issued By: Jeff Wilmoth
Current Permit Fees Paid: $555.00 (additional fees may be required upon installation of system).
Permit Expiration Date: 11/17/2028 (based on date of inspection)
Permit Conditions:
1 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 Drainfield 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.
DESIGN FORM—PAGE ONE Assessor's Parcel Number: 520241350010 -- --
A design will be reviewed when 3 conies of each of the following are submitted:
0 Completed design form that has been signed and dated. °Scaled layout sketch,including all applicable items on checklist.
°Scaled plot plan,including all applicable items on checklist. Cross-section sketch,including all applicable items on checklist.
This form may be scanned and available for public view on the Mason County Web site.Maximum paper si:e: 11"X 17"
PARCEL IDENTIFICATION
Permit Number: SWG 00025- 00 1.42.0 Designer's Name: ADAM HUNTER
Applicant's Name: DAHL PROPERTIES Designer's Phone Number: 3607531226
Mailing Address: 261 N HAMILTON RD Designer's Address: PO BOX 162
CHEHALIS WA 98532 City State Zip OLYMPIA WA 98507
City State Zip Designer's Email JHANDASSOCIATES@HOTMAIL.COM
DESIGN PARAMETERS
Treatment Device
❑Glendon O Sand Filter O Mound O Sand Lined Drainfield O Recirculating Filter O ATU ❑Other
Treatment Level(check all that apply): I A J B I C J BLI J BL2 J BL3 VIE IN
Drainfield Type
❑ Gravity O Pressure 121Trench O Bed O Sub Surface Drip
Septic Tank/Drainfield Specifications Laterals
Number of Bedrooms 4 Schedule/Class 40
Daily Flow:Operating Capacity 360 gpd Length 45 ft
Daily Flow:Design Flow 480 gpd Diameter 1.25 in
Septic Tank Capacity(working) 1200 gal Number 6
Receiving Soil Type(1-6) 4 Separation 6 ft
Receiving Soil Appl.Rate 0.6 gpd/ft2 Orifices
Required Primary Area 800 ft2 Total Number of Orifices 90
Designed Primary Area 810 ft2 Diameter 1/8 in
Designed Reserve Area 800 ft2 Spacing 36 in
Trench/Bed Width 3 ft Manifold
Trench/Bed Length 270 ft Schedule/Class 40
Elevation Measurements Length 35 ft
Original Drainfield Area Slope 20 % Diameter 2 in
New Slope,If Altered 20 % Preferred manifold configuration used? 6a'Yes O No
Depth of Excavation Up-slope 17 in Transport Pipe
from Original Grade Down-slope 9 in Schedule/Class 40
Designed Vertical Separation 24 in Length 20 ft
Gravel-based Drainfield Required? O Yes O No V Diameter 2 in
Pump Required? RIYes O No Dosing and Pump Chamber
Pump/Siphon Specifications Number of doses/day 6
Diff.in Elevation Between Pump&Uppermost Orifice 6 ft Dose quantity 80 gal
Drainfield Squirt Height/Selected Residual(head) 5 ft Chamber Capacity(flood) 1200 gal
Uppermost Orifice L 'Higher O Lower than Pump Shutoff Pump controls:Please check those required.
Capacity @ Total Pressure Head 37.073 gpm Ed Timer Er Elapse Meter 0 Event Counter
Calculated Total Pressure Head 11.5916 ft If Timer: Pump on J 80GALAPPPPfR
1'4
19
Comments /-)/toll a (N )rcV rG��/VG/r o,rd [4,
nn ,,,, fl2
MASON Ctcv.e.
OUNTYJAN FNVIRfl21 2MtAENTAL I iCALTM
J aid:4/14/2025
DESIGN FORM—PAGE TWO Assessor's Parcel Number: 520241350010 -- L --
Permit Number: SWG 0;5- QO-(2o
DESIGN CHECKLISTS
Scaled Plot Plan Scaled Layout Sketch Cross-Section Sketch
g Test hole locations g Drainfield orientation and layout Reference depth from original grade:
g Soil logs M' Trench/bed dimensions and 121 Septic tank
Property lines critical distances within layout ®' Drainfield cover
g Existing and proposed wells 6� D-Box/Valve box locations Reference depth from original grade
within 100 ft of property E ' Septic tank/pump chamber and restrictive strata:
Ei Measurements to cuts,banks,and locations ® Laterals,trench/bed,top and
surface water and critical areas E3' Observation port location bottom
O Location and orientation of El Clean-out location E' Curtain drain collector
curtain drain and all absorption Manifold placement 61 Sand augmentation
components E' Orifice placement Other cross-section detail:
• Location and dimension of E' Lateral placement with distance Er Observation ports/clean-outs
primary system and reserve area to edge of bed
Other Information
Buildings
E7 Audible/visual alarm referenced Yes No
Direction of slope indicator 0 Scale of drawing shown on scale Elf O Design staked out
E7 Waterlines bar 0 0 Recorded Notices attached
O Roads,easements,driveways, Q Elevation benchmark and relative 0 O Waiver(s)attached
parking elevations of system components a ❑ Pump curve attached
E7 North arrow and scale drawing O O Evaluation of failure
shown on scale bar Non-residential justification
O O Waste strength
O ❑ Flow
DESIGN APPROVAL
The undersigned designer must oti d b staller at time of installation IR/Yes 0 No
10/10/25
Si: atur ' Designer Date
The undersigned has reviewed this d i on behalf of Mason County Public Health and determined it to be in
compliance with state and local o 1' regulations:
Jt 1-Z-( -2
En ro al Health Specialist Date
CAUTION: DESIGN APPROVAL IS VALID ONLY UNDER THE FOLLOWING CONDITION:
✓ The design is stamped"Approved"by Mason County Public Health.
✓ 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. PPROV
This form may be scanned and available for public view on the Mason Cou eb site. Revised:4/12 5 ;1
JAN 2 1 2026 �:
MASON COUNTY ENVIRONMENTAL HEALTH
JBW
PAGE 1
MASON COUNTY HEALTH DEPARTMENT
ON-SITE SEWAGE DISPOSAL SYSTEM DESIGN
SITE#: PARCEL#: 520241350010
DATE SUBMITTED: 10/09/25 LEGAL/LOT#:A PTN OF 520241350010
SUBMITTED BY: ADAM HUNTER
APPLICANT: DAHL PROPERTIES
ADDRESS:
I.CALCULATIONS
NUMBER OF BEDROOMS= 4
RESIDENTIAL GPD FLOW= 480
IF NON-RESIDENTIAL-GPD FLOW
WILL BE AS FOLLOWS:
GPD=
APPLICATION RATE= 0.6 GPD/FT2
REDUCTION=LEAVE BLANK IF NO REDUCTION TAKEN
DRAINFIELD SIZING
ABSORPTION AREA= 810 FT2
TRENCH LENGTH OR BED CONFIG.= 6-45FT TRENCHES
II.WATERPROOF SEPTIC TANK
COMPOSITION AND SIZE= 1200 GAL.CONCRETE
NEW OR EXISTING= NEW
III.DRAINFIELD CROSS SECTION
DEPTH TO DRAINROCK BOTTOM= 1'-5"(UPSLOPE)
ROCK DEPTH BELOW PIPE= 0'-6"
SEPARATION FROM TRENCH BOTTOM TO IMPERMEABLE
MATERIAUSEASONAL SATURATION= 0"
FILL DEPTH= '" p P R J
TRENCH WIDTH= • �0
IV.PUMP REQUIREMENTS JAN 2 1 2026
MASON COUNTY ENVIRONMENTAL O HEALTH
DOSING VOLUME IN GALLONS= 80
NUMBER OF DOSES PER DAY= 6 JBW
�1•
..11:O/25
'•' ADAM J.HUNTER
26
PAGE 2
V.PRESSURE CALCULATIONS
USING PIPE CLASS= 200
ORIFICE DIAMETER= 1/8
LATERAL#1 =
SQUIRT HEIGHT(FT)= 5.00
(NOTE(2):ORIFICE DISCHARGE RATE=(11.79)X(ORIFICE DIAMETER)SQ2 X
SO ROOT OF(TOTAL PRESSURE HEAD)
ORIFICE DISCHARGE RATE= 0.41193
LATERAL LENGTH IN FEET= 45.00
ORIFICE SPACING= 3'0"
DISTANCE FROM END CAP= 1'6"
NUMBER OF HOLES= 15
LATERAL DISCHARGE RATE= 6.179
LATERAL#2=
SQUIRT HEIGHT(FT)= 5.00
ORIFICE DISCHARGE RATE= 0.41193
LATERAL LENGTH IN FEET= 45.00
ORIFICE SPACING= 3'0"
DISTANCE FROM END CAP= 1'6"
NUMBER OF HOLES= 15
LATERAL DISCHARGE RATE= 6.179
LATERAL#3=
SQUIRT HEIGHT(FT)= 5.00
ORIFICE DISCHARGE RATE= 0.41193
LATERAL LENGTH IN FEET= 45.00
ORIFICE SPACING= 3'0"
DISTANCE FROM END CAP= 1'6"
NUMBER OF HOLES= 15
LATERAL DISCHARGE RATE= 6.179
LATERAL#4=
SQUIRT HEIGHT(FT)= 5.00
ORIFICE DISCHARGE RATE= 0.41193
LATERAL LENGTH IN FEET= 45.00
ORIFICE SPACING= 3'0"
DISTANCE FROM END CAP= 1'6"
NUMBER OF HOLES= 15
LATERAL DISCHARGE RATE= 6.179
i
,.
JAN 21 20?_6
MASON COUNTY ENVIRONMENTAL HEALTH
JBW
10/9/25
:i►�
rte- ?',.f
• ADAM J.HUNTER '-
26
PAGE 3
LATERAL#5=
SQUIRT HEIGHT(Fr)= 5.00
ORIFICE DISCHARGE RATE= 0.41193
LATERAL LENGTH IN FEET= 45.00
ORIFICE SPACING= 3'0"
DISTANCE FROM END CAP= 1'6"
NUMBER OF HOLES= 15
LATERAL DISCHARGE RATE= 6.179
LATERAL#6=
SQUIRT HEIGHT(FT)= 5.00
ORIFICE DISCHARGE RATE= 0.41193
LATERAL LENGTH IN FEET= 45.00
ORIFICE SPACING= 3'0"
DISTANCE FROM END CAP= 1'6"
NUMBER OF HOLES= 15
LATERAL DISCHARGE RATE= 6.179
LENGTH DIAMETER FLOW FRICTION LOSS
SECTION (FT) (IN) (GPM) (FT)
AB 20.00 2.00 37.073 0.3814
BC 1.00 2.00 18.537 0.0053
CD 1.00 2.00 12.358 0.0025
DE 35.00 2.00 6.179 0.0243
EF 45.00 1.25 6.179 0.1781
TOTAL= 0.5916
TOTAL HEAD LOSS "
1)FRICTION LOSS THROUGH SYSTEM= 0.5916
2)ELEVATION DIFFERENCE = 6.0000
3)RESIDUAL = 5.0000
TOTAL= 11.5916
f
1 Pit
10/9/25
SON CMAOUNTY ENVIRONMENTAL HEAL
_ �. LBW
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ADAM J.HURTER •�
MYERS ME3
Capacity titers per minute
0 50 100 150 200 250
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565'± SCALE-1"=100'-0" / 99 100
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�sT SEE DETAIL � 45' /
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Gam WV% vi� d / . ,. uli}u 401
/ "„1' 26 'RBM IS GROUND .@ T.H.1(RBM=100.0)
/
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110,WETLAND BUFFER •
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- /SCALE 1"=so' / UPStOPE OD EEPtR Ti--c,�J.
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150.-OREE \ \A
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TANK DETAIL-NO SCALE r
SAN 2 1 L:`j~
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NOTES: i ...b. Y LA VIRO�I'.°�" C� ,.
-RESTRICTIVE LAYER BELOW 41"-PRIMARY/21"-RESERVE-
ILI THIS IS NOT A SURVEY:
FIVE TIMES RULE MET �'I�I i VI��V� _°..,a
-NO WELLS WITHIN 100'OF DRAINFIELD �i ,o,,.,°.. - �I SITE FEATURES,TOPOGRAPHY.ELEVATIONS AND BENCHMARKS ARE BASED ON ASSUMED DATUM
-ELAPSE TIME METER AND EVENT COUNTER REQUIRED ' a,� PROVIDED BY THE OWENER AND COUNT!PLANNING RECORDS AND ARE INTENDED ONLY FOR THE
REVIEW AND CONSTRUCTION OF THE PROPOSED SEPTIC SYSTEM DESIGN. JIM HUNTER&ASSOCIATES
-RISERS TO SURFACE REQUIRED OVER ALL TANK LIDS RECOMMENDS THAT A LICENSED PROFESSIONAL LAND SURVEYOR ALWAYS BE USED TO SET CORNER,
O PROPOSED 4 BEDROOM RESIDENCE ESTABLISH LOT LINES,DETERMINE ELEVATIONS AND TOPOGRAPHY AND/OR PROVIDE A LEGAL SITE PLAN.
SOIL LOGS ` NAVD88 IS UNKNOWN
O PROPOSED DRIVE ...TIC TANK A FEE MAY BE CHARGED AFTER INSTALLATION FOR FINAL INSPECTION&RECORD DRAWING
mx�l
1) SANDY LOAM 0-41"
03 PROPOSED WELL MOTTLED SILT LOAM 41"+ - HEAD WEST ON SHELTON MATLOCK TO A LEFT ON HIGHLAND JIM HUNTER AND ASSOCIATES
O PROPOSED STUBOUT/CLEANOUT(IE.-100.0) 2) SANDY LOAM 0-41" "°"^ mow" CONTINUE FOR 1.6 MILES TO SITE ON THE RIGHT. P.0 BOX 162,OLY,WA 98507 753-1226 1HANDASS0CIATES@H0TMAIL.00M
MOTTLED SILT LOAM 41"+ vl . DESIGNER-ADAM HUNTER
O PROPOSED 1200GAL.SEPTIC TANK(IN.EL.-97.5/OUT.EL.-97.2) 'Rom sullc we,- '� -
)
3) SANDY LOAM 0-21" 1 = : ,,,,a„,,,,µ SEPTIC SYSTEM DESIGN FOR-
A.
O PROPOSED 1200GAL.PUMP CHAMBER(PUMP EL.-94.0) CEMENTED TILL 21"+ 1 ..N.N !II w,w
_
DAHL PROPERTIES
O7 20'-2"PVC TIGHTLINE(SCH40) 4) SANDY LOAM 0-23" ,",,,„,,,",,p,„, I ,q,"„,a„. INU s� SITE ADDR-
CEMENTED TILL 23"+ iH I XX HIGHLAND RD
O6 PROPOSED DRAINFIELD 5) SANDY LOAM 0-22" rll, II
_ LEGAL- A PTN OF 520241350010 1 OF2
�"+ * •, � � 1 TP# A PTN OF 520241350010 SITE#
O9 PROPOSED OSCAR XO2 RESERVE AREA CEMENTED TILL
rl,1acreen\rwlcKl
4"PVC INSPECTION PORT
GENERAL CONSTRUCTION NOTES
TRENCH LENGTH- 270'-0"
TRENCH WIDTH - SEE TRENCH SECTION I III el:
I_ O LOAMY SAND/SANDY LOAM ORIGINAL GRADE
TRENCH DEPTH - 1'-5"BELOW OG(UPSLOPE)/0'-9"BELOW OG(DOWNSLOPE) - 7c,
TRENCH SEPARATION - 6'-0"ON CENTER a FILTER FABRIC
BACKFILL- APPROVED EXCAVATED MATERIAL O a G o: 1 1/4" PVC PERF PIPE
GRAVEL- 3/4"-2 1/2"WASHED ROCK 0 - 211 �a ��; O SCH40
SEPTIC TANK- NEW 1,200 GAL.,WATER TIGHT TANK -o - rn �J U`�o0a C.(
PUMP CHAMBER - 1200 GAL.WATER TIGHT b(d -J WASHED DRAINROCK
O 0 0
e
C7 <3 c5 ./
PUMP MODEL- MYERS ME3F SET TO PUMP AT 80 GAL.
INTERVALS. CHECK VALVE AND HIGH LEVEL ALARM REQUIRED
3'-0"
SQUIRT HEIGHT- 60"
NOTE:PLACE ORIFICE AT 3 O'CLOCK USE"T"TO"T"TYPE CONSTRUCTION
NOTE: ALL FOOTING DRAINS, ROOF DRAINS, AND STORWATER RUN-OFF TRENCH SECTION
MUST BE DIVERTED AWAY FROM ANY SEPTIC SYSTEM COMPONENT. NO SCALE
RESTRICTIVE LAYER
NOTE:END OF EACH LATERAL IS TO HAVE A SWEEP 90 RISERS ARE REQUIRED TO OR ABOVE FINISHED GRADE
WITH THREADED END CAP TO JUST BELOW FINISHED GRADE OVER TANK LIDS. IF GROUNDWATER OVER THE TOP OF
AND PORT TO FINISHED GRADE THE TANKS IS A CONCERN,THEN RISERS MUST BE PLACED
OVER ALL TANK LIDS TO THE SURFACE. THE RISERS
MUST BE SEALED WATERTIGHT AT THE JOINT BETWEEN
/$" HOLES
TANK AND THE RISER 10/9/25
J 4.;43';
- rawer Ir •
GENERAL NOTES �, 1.25 PVC PIPE
' - SCH40
ANY VARIATIONS TO THIS DESIGN SHALL FIRST BE APPROVED BY JIM HUNTER AND ASSOCIATES AND THE COUNTY SANITARIAN. 4.;et`t- l 1/
OWNER INSTALLER SHALL NOT REMOVE OR DISTURB ANY TOP SOIL WHILE CLEARING TREES AND STUMPS IN DRAINFIELD uo;+a 3-0
ADAM J.HURTER
AREA. REMOVAL OF TOP SOIL COULD RENDER THE SITE UNUSABLE. 'Itt.a i tili +JFA ' • P p rt 1
x
OWNER SHALL BE AWARE OF THE POSSIBILITY OF TANKS FLOATING OUT OF THE GROUND SHOULD THE TANKS BE PUMPED O PVC PERF PI , ETAIL '
EMPTY DURING SEASONAL HIGH WATER TABLE CONDITIONS. I
NO SCALE ,J2 .;. y
ALL CONSTRUCTION MATERIALS AND THE INSTALLATION OF THIS DESIGNED SEPTIC SYSTEM SHALL CONFORM TO ALL MASON cO L , ,) ii;t /
APPLICABLE STATE AND COUNTY HEALTH DEPARTMENT REQUIREMENTS. tiT Y E I/�R0^I��"
USE OF SOME RESERVE DRAINFIELDS MAY NECESSITATE PUMP AND/OR SAND FILTER INSTALLATIONS. p `-
TO ORAINFIELCI "'
PRESSURE LATERALS
THE ADDITION OF AN APPROVED EFFLUENT FILTER IN THE SEPTIC TANK IS REQUIRED TO ENSURE THAT SOLIDS DO NOT
PUMP(A)TO BE CONTROLLED BY TIMER SET TO
PASS TO THE DRAINFIELD CAUSING PREMATURE DRAINFIELD FAILURE AND COSTLY REPAIR. ��
DOSE 80 GALLONS,IF AVAILABLE,EVERY 4 HOURS
ALL REQUIRED TESTS SHALL BE SUCCESSFULLY RUN PRIOR TO CALLING JIM HUNTER&ASSOCIATES FOR FINAL �/ ` BASED ON MEASURED PUMP OUTPUT RATE
INSPECTION. ALL COMPONENTS,INCLUDING ALL TANK ACCESS LIDS MUST BE ACCESSIBLE FOR INSPECTION.
CONTRACTOR SHALL BE RESPONSIBLE FOR COST OF RETURN INSPECTIONS DUE TO FAILED TESTS OR INACCESSIBLE 0 0 0 QJ FLOW CONTROL VALVE JIM HUNTER AND ASSOCIATES
COMPONENTS ■ ■ ■ P.O.BOX 162,OLY,WA 98507 753-1226 JHANDASSOCIATES@HOTMAILSOM
■i■ B ■i■� DESIGNER-ADAM HUNTER
THIS IS A SPECIAL DESIGN DUE TO ADVERSE SOIL CONDITIONS,GROUNDWATER TABLE AND/OR TOPOGRAPHY. JIM
HUNTER&ASSOCIATES HAS DESIGNED THIS SYSTEM IN ACCORDANCE WITH ALL CURRENT STATE AND COUNTY <-RISER WITH LOCKING LID SEPTIC SYSTEM DESIGN FOR-
HEALTH DEPARTMENT REQUIREMENTS AND ASSUMES NO RESPONSIBILITY FOR ITS USE OR LONGEVITY. DAHL PROPERTIES
THE OWNER THEREFORE AGREES TO MAINTAIN AND MAKE ALL NECESSARY REPAIRS TO THE SYSTEM AT TYPICAL CONSTRUCTION SITE ADDR-
NO COST TO JIM HUNTER&ASSOCIATES. J XX HIGHLAND RD
DRAINFIELD CONTROL BOX LEGAL- A PTN OF 520241350010 I2 OF 2
NO SCALE TP#
A PTN OF 520241350010