HomeMy WebLinkAboutSWG2025-00141 - SWG Application / Design - 4/18/2025 ai, „
MASON COUNTY 415 N 6TH STREET,SHELTON,WA 98584
SHELTON:360-427-9670,EXT 400
Public Health & Human Services BELFAIR:360-275-4467,EXT 400
ELMA:360-482-5269,EXT 400
FAX:360-427-7787
On-Site Sewage System Permit: SWG2025-00141 LOB Iv1
I
APPLICANT DIRKS KENNETH E Phone:
Address: 852 N 145TH LN SHORELINE, WA 98133
OWNER DIRKS KENNETH E Phone:
Address: 852 N 145TH LN SHORELINE, WA 98133
SEPTIC DESIGNER CINDY WAITE* Phone: 360-701-0205
Address: 80 E PICKERING LANE SHELTON, WA 98584
Site Address: UNKNOWN
Primary Parcel Number: 423295000035
Permit Description: Non-conforming repair 1bd Oscar X02
Permit Submitted Date: 04/18/2025
Permit Issued Date: 01/02/2026
Issued By: Rhonda Thompson
Current Permit Fees Paid: $990.00 (additional fees may be required upon installation of system).
Permit Expiration Date: 04/23/2026 (based on date of inspection)
Permit Conditions:
1 Proposed development subject to zoning requirements and approval by the planning
department staff per Mason County Title 17.
2 Permit must be installed by a Mason County Certified Installer unless prior written
authorization from Mason County is obtained.
3 Drainfield installation not to exceed designed upslope and downslope depth specified on
design form.
4 Installer is responsible for obtaining Mason County installation approval prior to backfill of
system components.
5 Installer is responsible for obtaining Septic Designer/Engineer installation approval prior to
backfill of system components.
6 Mason County Asbuilt Form, Record Drawing, and Installation fee must be submitted for
final installation approval.
7 This septic system is considered a non-conforming repair. Future residential building
permit applications will require upgrades to the septic system.
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
DATE RECEIVED:
MASON COUNTY 04//S-2o25 cn
COMMUNITY SERVICES AMOUNT RECEIV RECEIVED BY: W Cn
o mn Public Health(Community Health/Environmental Health)
360-427-9670.ext. •400 or 360-27S-4467.ext.400 < c0
41S N.6th Street-Shelton.WA 98584 SWG 20 Z'5 -
OO /' // O 70
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ON-SITE SEWAGE SYSTEM APPLICATION 3
XI
m n
APPLICANT PHONE m
KENNETH DIRKS 206-240-9097 z
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MAILING ADDRESS-STREET.CITY,STATE,ZIP CODE
SITE 145TH LANESHORELINE WA 98133 m
•STREET.CITY.ZIP CODE C \CI - A3
30 N LAKESHORE PLA : SV OODSPORT WA 98548
NAME OF DESIGNER APR 1 b lava 'HONE I N
CINDY WAITE 60-701-0205
NAME OF INSTALLER / ONE I (�,)
By �-- 74
PERMIT TYPE(select one) DRINKING WATER SOURCE — I N
K RESIDENTIAL OSS H COMMUNITY OSS COMMERCIAL OSS ff. PRIVATE INDIVIDUAL WELL 15 PRIVATE TWO-PARTY WELL Z CO
TYPE OF WORK(select one)
I 7 PUBLIC WATER SYSTEM LAKE CUSHMAN I r
NEW CONSTRUCTION/UPGRADES �REPAIR/RE LACE OTHER DETAILS(select all that apply) 0 TABLE IX REPAIR (II
SUBMITTALS 0 SURFACING SEWAGE VI EXISTING FAILURE 0 SHORELINE
PI-DESIGN FORM(REQUIRED) SEPTIC DESIGN(REQUIRED) BEDR ,N6 LOT SIZE W I O
�WAIVER(S)(IF APPLICABLE) 6{ 70'X173'X70'X124' O r
A I O
DIRECTIONS TO SITE AND SITE CONDITIONS.(ex locked gale)
GO TO HOODSPORT, TURN LEFT ONTO LAKE CUSHMAN ROAD, TURN LEFT ONTO I o
WYNOOCHEE DR, TURN LEFT ONTO LAKESHORE PLACE, PARCEL IS ON THE LEFT r
(SECOND PARCEL LAKESHORE PLACE, BOAT ON UPPER LAYER, RV ON THE -1 0
DRIVEWAY. I w
SITE MUST BE FLAGGED FROM MAIN ROAD AND TEST HOLES MUST BE FLAGGED WITH TEST HOLE NUMBERS. I Cn
OFFICIAL USE ONLY BELOW THIS LINE
UPGRADE/FAILURE SOURCE(tor reporting purposes)
0 VOLUNTARY 0 MAINTENANCE/PUMPING ❑BUILDING PERMIT ['HOME SALE ❑COMPLAINT ❑OTHER:
INSPECTOR SOIL LOGSCY4,191\-6/(1)/k.c.,) COMMENTS/CONDITIONS
1V1/ -. (') AV
_AN\A`t- , ciiNt, eon -/--
•
vJac�C �� 1) otd lotjtovj ,,t- oc l{
-- ;CA,419)1(b 'T y 1
SOIL CODES: n\\ 1 ,‘ ,(0041 .
y s RECORD DRAWING AND INSTALLATION REPORT
V=VERY G=GRAVELLY S=SAND L=LOAM Si=SILT C=CLAY E=EXTREMELY R=ROOTS , P� REQUIRED FOR FINAL APPROVAL.
INSPECTOR SIGNATURE DATE APPLICATION EXPIRATION DATE APPLICATION APPROVED/ISSUED BY DATE
ktiNiN)(01 LI 3/i- 1, r \ Izlz,L
THIS FORM MAY BE SCANNED AND AVAILABLE FOR PUBLIC VIEW ON THE MASON COUNTY WEBSITE REVISED 12/7/2015
DESIGN FORM—PAGE ONE Assessor's Parcel Number: 4 2 3 2 9 — 5 0 — 0 0 0 3 5
A design will be reviewed when 3 copies of each of the following are submitted:
'1 Completed design form that has been signed and dated. Scaled layout sketch,including all applicable items on checklist
'1 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 size: II"X 17"
PARCEL IDENTIFICATION
Permit Number: SWG 2,27cf Q O / y/ Designer's Name: CINDY WAITE
Applicant's Name: KENNETH DIRKS Designer's Phone Number: 360-701-0205
Mailing Address: 852 N 145TH LANE Designer's Address: 80 E PICKERING LANE
SHORELINE WA 98133 SHELTON WA 98584
City State Zip City State Zip
DESIGN PARAMETERS
Treatment Device
❑ Glendon Biofilter ❑ Sand Filter 0 Mound 0 Sand Lined Drainfield 0 Recirculating Filter,Type:
'Aerobic Unit Make/Model IX° Z❑ Disinfection Unit Make/Model Other:
Drainfield Type
0 Gravity 0 Pressure 0 Trench 0 Bed 0 Sub Surface Drip
Septic Tank/Drainfield Specifications aterals
Number of Bedrooms 1 Schedule/C NETAFIN
Daily Flow:Operating Capacity i 90 gpd Length c� 5 ft
Daily Flow:Design Flow 120 gpd Diamete Z `N' in
Septic Tank Capacity(working) OSCAR X02 gal Numbe <Ns 2
Receiving Soil Type(1-6) 1 Separ i@tn ,, 3 ft
Receiving Soil Appl. Rate 1. gpd/ft2 Orifices
Required Primary Area 126 ft2 Total `ifi ees, / 2X50=100
Designed Primary Area 120 ft2 Diameter EMITTER in
Designed Reserve Area NONE ft2 Spacing .5 in
Trench/Bed Width 9 ft Manifold
Trench/Bed Length j 14 ft Schedule/Class SCHEDULE 40
Elevation Measurements Length 5'RETURN 5'SUPPLY ft
Original Drainfield Area Slope >1 o Q.
g /o Diameter :' ��,. 1 in
New Slope, If Altered % Preferre ton used? 0 Yes WiNo
Depth of Excavation Up-slope 6 in .. 4 `sport Pipe
p
from Original Grade Do, _slope 6 in Sche ass n'e. „IP
.4.-A NA
WAITE ,
Designed Vertical Separation 18 in Le E Y E
- LICENN SED DESIGNER ft
Gravelless Chambers Required? 0 Yes lid No 0 Optional in
LxpiHEs J5,10,
Pump Required? Fif Yes 0 No Dosing and Pump Chamber
Pump/Siphon Specifications Number of doses/day 411
Diff. in Elevation Between Pump&Uppermost Orifice `1 ft Dose quantity .22 gal
Drainfield Squirt Height/Selected Residual(head) ft Chamber Capacity(flood) 1000 gal
Uppermost Orifice Elf Higher 0 Lower than Pump Shutoff Pump controls: Please check those required.
Capacity @ Total Pressure Head 7.08 gpm E'Timer C 'Elapse Meter C 'Event Counter
Calculated Total Pressure Head 7.01 ft If Timer: Pump on 30 seconds ,Pump off 3 hours
Comments
EXISTING TANK TO BE FILLED WITH C-33 SAND, OWNER TO VERIFY PROPERTY LINE ON THE STREET PRIOR TO
44i
INSTALLATION, INSTALLER TO MEET WITH DESIGNER PRIOR TO INSTALL, INSTALLER TO FOLLOW OSCAR X02
EQUIREMENTS. OWNER SHALL REFER TO OXCAR X02 OWNERS MANUAL FOR USE OF SYSTEM.
DESIGN FORM—PAGE TWO Assessor's Parcel Number:4 2 3 2 9 — 5 0 — 0 0 0 3 5
Permit Number: SWG
1 DESIGN CHECKLISTS
Scaled Plot Plan Scaled Layout Sketch Cross-Section Sketch
Vi Test hole locations C2( Drainfield orientation and layout Reference depth from original grade:
O Soil logs liti Trench/bed dimensions and lif Septic tank
I6 Property lines critical distances within layout Z Drainfield cover
VI Existing and proposed wells lif D-Box/Valve box locations Reference depth from original grade
within 100 ft of property lif Septic tank/pump chamber and restrictive strata:
O Measurements to cuts, banks,and locations G71 Laterals,trench bed,top and
urface water and critical areas Observation port location bottom
, Location and orientation oflean-out location ❑ Curtain drain collector
curtain drain and all absorption Fkalanifold placement 0 Sand augmentation
components
Al-orifice placement Other cross-section detail:
!il Location and dimension of i� Lateral placement with distance E ! Observation ports/clean-outs
primary system and reserve area to edge of bed
Buildings Other Information
!i6 Audible/visual alarm referenced Yes No
El Direction of slope indicator Gti Scale of drawing shown on scale 0 0 Design staked out
Iiii Waterlines bar 0 0 Recorded Notices attached
66 Roads, easements,driveways, 0 0 Waiver(s)attached
parking 0 0 Pump curve attached
171 North arrow and scale drawing 0 0 Evaluation of failure
shown on scale bar Non-residential justification
O 0 Waste strength
O ❑ Flow
DESIGN APPROVAL
The undersigned designer must be not' ed by i staller at time of installation 56 Yes 0 No
rz/2124
Signatur of Designer D to
The undersigned has reviewed this design on behalf of Mason County Public Health and determined it to be in
compliance with state and local on-site regulations:
Environmental Health pecialist Date
CAUTION: DESIGN APPROVAL IS VALID ONLY UNDER THE FOLLOWING CONDITION:
✓ The design is stamped"Approved"by Mason County Public Health. J2 /7'S
✓ The Onsite Sewage Permit bias not expired,the Permit Expiration Date is:
✓ Drainfield site conditions have not been altered to adversely affect conditions of design approval.
1/\\kk.
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.
This form may be scanned and available for public view on the Mason County Web site.
Updated Date: 12/7/2015
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_rAPPROVED
aJAN 02 2026co MASON COUNTY ENVIRONMENTAL HEALTHg 0 RET r ,
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MASON COUNTY ENVIRONMENTAL HEALTH
RET
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LICE SD DESIGNER •
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BASAL WIDTH
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JAN 0 2 2026 •4. •
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r :. MASON COUNTY E'IV1RONMENTAL HEALT �P6 . .
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Headworks:
There are two options for headworks with the OSCAR-X02 system. The
original X02 kit has the automatic reverse flush headworks while the new version
X02M kit has a manual headworks (see appendix). There are n solenoid valves in
the XO2M kit. APPROVED
gf�,--� JAN 0 2 2026
MASON COUNTY ENVIRONMENTAL HEALTH
i
2/32/3 1/3
, • , 410
IC: :321• r ` 11
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TABLE 2
Hydraulic Layout
OS-50 coils
Design Total # of Coils Dose Flush Excess
Flow Coils Lats. er lat. GPM GPM TDH
xl� 2,- 2. 1 1.4 7.8 50'
300 5 5 1 1.75 9.75 50'
360 6 3 2 2.1 6.2 50' c.450 8 4 2 2.8 9.2 50' �, �1'�
480 8 4 , `NAS..i 9i�
2 2.8 9.2 50'. $`4;_14 c
600 10 ,,' �. o ,2
5 2 3.5 11.5 5 �P "4," ' 15
O2 CINDY I
TABLE 3 LICENSE D GN R 3 /'
Hydraulic Layout z
OS-100 coils
Design Total # of Coils Dose Flush Excess
Flow Coils Lats. er lat. GPM GPM TDH
' 40 2 . I 2 1 1.4 4.6 50'
360 3 3 1 2.1 6.9 50'
i
480 4 1 4 1 2.8 9,2 50'
600 5 5 1 3.5 11.5 50'
TABLE 4
Minimum Shoulder Lengths
OS-50
Design Flow Minimum Shoulder Length in
Feet
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.
APPROVED
TABLE 5 JAN 0 2 2026
Minimum Shoulder Lengths MASON COUNTY ENVIRONMENTAL HEALTH
OS-100
Design Flow Minimum Shoulder
!49-- (?-G 11' 2 i•nchcs t(,S
360 21' 4 inches
480 28' 4 inches •
600 j 35' 5 inches 43- 1
The dimensions in Table 5 represent the minimum required length of the sh eAS,,�_
which include coils, spacing between coils, and shoulder. These lengths c , :°(1 20'
extended to match site conditions. Minimum shoulder spacing is 6 inche e v',�'
illustration below for example of shoulder length. 00,,, N-
O UCENS
# CIN Y ql 1
DESIG
Basal Area Ex�' +r �s,o,
The basal area is comprised of the total area where the C-33 sand media is
in contact with the re eiving soil. The minimum required basal area is calculated
by dividing the design low rate by the soil loading rate specified in WAC 246-272A
(local codes may havediffering loading rates).
I
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 ater tight, structurally sound partitions: for both the
treatment tank and di charge tank a double compartment tank with tee baffles
can be used (no flow t rough ports). Flip the discharge tank around so the smaller
compartment is first ai shown (see Illustration 2). The clarifier chamber is to
remain full. APPROVED
JAN 02 2026
VENTED OD
Ar•-- MASON COUNTY ENVIRONMENTAL HEALTH
I., RET
-1 i Ilk' mw. 1 • i VW •.
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Illustration 2 JO C 11
4 OP As the daily design flow rates increase, larger tanks will be need•6'`Ii~ yoe.I
become necessary to have individual tanks for each chamber or a co ?faatiorg. ' !rite P'" �j
tanks to meet the volume requirements. For example: StQna �i• b 1
,O CINDY E ITE I 1
0. LICENSED DE IG R ` l,,
"���' "T Ilk A��w�
Exr•iR�s Ob,1..N
3,000 eod design flow (refer to Table 1-21.
Septic chamber= 4000 gal. needed, use a 3000 gal. tank + 1000 gal. tank.
Aeration Chamber = 2-1000 gal. tanks.
Clarifier chamber = 2- 1000 gal. tanks.Pump chamber = 3000 gal. tank + 1000 gal. tank. \`4
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
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***
Design Septic •eration Clarifier* Pump Aerators Suggest tank sizes**
Flow .-.
500 gpd 670 , 330 330 670 1 1,000 gal.treatment, 1,000 gal.discharge
750 gpd 1,000 I 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 1 3k&1500 treatment&3k&1500 discharge
2250 gpd 3,000 : 1,500 1,500 3,000 5 13k&1500 treatment&3k&1500 discharge
3,000 gpd 4,0001 2,000 2,000 4,000 6 use multiple tanks to meet volume needs
3,500 gpd 4,700 I 2,310 2,310 4,700 I 7 use multiple tanks to meet volume needs
*Minimum liquid volume needed. APPROVED
**Local health jurisdictions may require larger tank volumes. JAN 0 2
***Table 1-2 is a quick reference guide. 2026
MASON COUNTY ENVIRONMENTAL HEALTH
Aerator: RET
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 r higher than the top of the tank risers, see Illustration 3.
If the site is sloped th aerator box can be buried, upslope from the tanks. The
sides of the aerator bdx 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 tdward diffusors.
Aesthetic concerns should be considered when placing the aerator b 45-
a 1)
Place the aerator aw from house windows, doors, and areas where peo tq Ato congregate, such a ,patios areas and barbecues. -
N r z
10
FIrre �n e CINDY 0/ cci h
LICENSED IGNE
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rilikA
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Illustration 3 ( \1td1
The OS-100 OSCAR coil contains 100, 0.42 gph Netafim emitters in a 50 sq. ft. foot
print. Emitter concentration is 2 emitters per sq. ft. Design flow for each OS-100 is
100 gpd.
Sample Coil layouts
300 gpd 360 gpd
MIN.SHOULDER LENGTH
1 MIN.SHOULDER LENGTH
; 411/411...;1 j AfIA'VI*..1: I
; ,N.)".,Vvr* L VrOALIJ f 0 1 "
480 gpd
MIN.SHOULDER LENGTH a
i
�144V-r`rrJ * rJ .. APPROVED
a b.
'L JAN 0 2 2026
MASON COUNTY ENVIRONMENTAL HEALTH
RET
Headworks: HWN-.7-RF
z)(..
• 3/4 inches Arkal disc filter, mesh, 130 micron 43
• 3/4 inches Arad flow meter P ��:
FS
• Three oil filled pressure gauges (0-100 psi) `` °� "�, to
• 5 Netafim normally closed solenoid valves (Model 80) a J
Cr I ^� L , AITE �
1 okif 4P j
k,
_40. .,..„
�4. .7Ui-SIGNER
).
i4. , T' '14.1"j
• iiii -Y6f
I.
a f. •7
F=L(Q/KO)^1.85
F=friction loss through pipe I feet of head
Y
L=length of supply line in feet
Q=Flush GPM
K=47.8(1'SCHEDULE 40)
L_
LENGTH 5_
Q FLUSH GPM AI 7.8! I'
K (1"SCHEDULEN 40) lni 47.8'
`• FRICTION LOSS ----a
Elevation difference ` 1
TDH 1.174744
TOTAL HEAD
FRICTION LOSS 34
ELEVATION FROM PUMP
TANK TO OSCAR
TOTAL HEAD 1.174744 <50 EXCESS TDH
GMP DISCHARGE AT DF : 1
EMITTER GPH .42
MINUTES PER HOUR 60
#EMITTERS 50
#COILS 2 _
GPM PER COIL imit0.35 APPROVED
GPM PER TOTAL COILS 0.7 JAN 0 2 2026
DOSE VOLUME MASON COUNTY ENVIRONMENTAL HEALTH
GPM PER COIL 0.3
-S t----- -- -- RET
COILS 2 — -- ��
SECONDS IN MINUTES av.SECONDS ON ��.
GALLONS PER DOSE !Lill)
if�oF ^ti c•�kTIMER SETTING � �TIMER SETTINGS GPD -- — — - 51P DOSE — — f cf CI D5A1 Al {AITE !i`
/ ���J _ LICENSED DESIGNER
DOSES PER DAY '���
------ — L v'IkLS odor
TOTAL GALLONS PER DAY i ga.tr2,
1\ `1"1
Headworks, manual 'flush: HWN-.7-man
• 3/4 inches Arkal disc filter, mesh, 130
micron
• 3/4 inches Arad flow meter
• Three oil filled pressure gauges (0-100
psi)
• One 1 inch Spears gate valve for
flushing.
siOABIO ,... 0 i _. , ,
i
Immummen- witp
OSCAR-X02 Parts list (500 gpd).
Each OSCAR-X02 unit ill include:
/i.
• LF1 P-RF-ARA co trot panel
• LOT-30, 1/2hp, 12O volt pump APPROVED
• Hi-Blow Aerator HB-80 (80 liter/minute) JAN 02 2026
• Hi-Blow diffuse
• 05-50 or OS-10 Coils MASON COUNTY ENVIRONMENTAL
• PVC fittings and drip tubing adapters RET
• HWN-.7-RF aut atic headworks �Q3- -�
• Solid 'h inches oly tubing for connections -P�F VAS �'T
• 2 float switches y ��.i4 y° et,,
OSCAR-X02M Parts list (500 gpd). �� .J ti ,-
Each OSCAR-X02 unit ill include: ° Lk . I' =)ESIGNER
• LF1 P-RF-ARA co trot panel G "' .. .' ,'sNu��,�
• LOT-30, 1/2 hp, 120 volt pump
• Hi-Blow Aerator HB-80 (80 liter/minute)
• Hi-Blow diffuse
• OS-50 or OS-100 Coils
• PVC fittings and drip tubing adapters \N4
• HWN-.7-RF-man \v
• Solid 'h inches poly tubing for connections
• 2 float switches
1
I
Installation Notes
Oscar-X02 Treatment System
30 N Lakeshore Place 42329-50-00035
1. The prepared site pl n is not a survey. It's the owner's responsibility to verify property
lines, utility lines (water, sewer, power, phone and gas) prior to installation.
2. This is a repair for alone bedroom system with install approval in 1991.
3. Installer responsib a to contact designer prior to installation.
4. Installer responsib a to submit installation form to designer with a plot map, tank
information, pump information any changes made to the design within two weeks of
final inspection by the Mason County Health Dept.
5. Oscar drainfield: TM C-33 sand media as per Washington Department of Health's
Recommended S ndards and Guidance for Intermittent Sand Filter.
6. Minimum of 6" of and throughout out the lateral(coil) area, must be level.
7. Oscar X02 parts II on Page 12
8. Controls to be set er X02 guidelines
9. Septic tank locatio must meet all required setbacks.
10. Keep wheeled vehi Ies off the drainfield area before, during and after installation.
11. Tracked equipment my
12. ,All ground, surface ater and roof drains must be diverted away from the septic tanks and
drainfield.
13. 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
14. Curtain drains can no closer than 10' upgradient and 30' down gradient of the drainfield
15. Exposed restrictive ayers, cuts, banks, etc. can be no closer than 50' downhill from the
drainfield.
16. Install access risers on all tanks, valve box and ends of laterals.
17. Make sure septic to k risers are epoxied or caulked to cast in riser rings on tank.
18. Lids must form a w ter and gas tight seal with the access risers.
19. This system must installed by a Mason County Certified installer.
20. Deviation from this esign without prior approval from the designer and Mason County
Health Department ill make this design null and void.
21. This design was siz d per Washington Administrative CodeWAC246-272A-0230. The
operating capacity i based on 45 gallons per day per capita with two persons per
bedroom. The mini urn design flow per bedroom per day is the operating city of
ninety gallons multi lied by 1.33. This results in a minimum design flow of e ndred
twenty gallons per ay. This creates a surge factor of 33% but anticipat tow ' inety
gallons per bedroom per day. �P F ^Sti`��,
441� y� S
APPROVED �� �) :8 ��%
c2 ` it Y E WAITS
LICENSED DESIGN/. l
JAN 0 2 2026
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MASON COUNTY ENVIRONMENTAL HEALTH
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System Owner Responsibilities:
1. Owner or installe 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 la ndry through the week.
12. Do not use exces-ive bleach or detergents with added whiteners.
13. Do not shower, d• laundry and dishwasher at the same time
14. Antibiotics can kill or impair the biological process in the septic tank.
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LIC F ON R
APPROVED , .,,=ES 05 o,
JAN 02 2026
MASON COUNTY ENVIRONMENTAL HEALTH
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&wvi,rotech E;w �weeri,wO
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June 13,2025
Ken Dirks
852 N 145'h Lane
Shoreline,Washington 98133
RE: Geotechnical Evaluation of On-Site Septic System
XX N Lakeshore Place, Hoodsport,Washington.
Parcel 42329-50-00035
To Whom It May Concern, .
Envirotech Engineering (E virotech) completed a site visit on June 11, 2025 to the property in order to
observe surface and subsu ace conditions. This geotechnical evaluation addresses the proposed on-site
septic system with relation o landslide hazards on and near the property. Information collected from site
observations and field testi g was completed by Robert McNearny with Envirotech.
Subsurface conditions we visually classified as poorly graded sand and gravel (SP-GP). It is our
understanding that the septic drainfield area is located within the northwest quadrant of the property
where we observed averag sloping grades of less than 40% exist. Other than a building pad that was
constructed, downslope to ain from the planned septic area have grades of up to 65%, descending toward
Lake Cushman.
It is our opinion that the p posed septic system will not influence the nearby critical descending slopes
exceeding 40%, provided at vegetation remains undisturbed on the critical slopes, and a subsurface drip
system is utilized. Vegetati n may he removed within the septic drainfield area.
Earth movement remains potential within the critical slopes, but this feature is located outside the
influence zone. However, e believe that the proposed drainfield has a sufficient setback from the top of
critical slope,and will not c ntribute to future landslides.
If you have any questions o need any further assistance. please contact Michael Staten at 360-275-9374.
Sincerely, -%
Envirotech Engineering I
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43045. APPROVED
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� JaN o 2 2026
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Michael Staten, P.E. MASON COUNTY ENVIRONMENTAt'HEALTH
Project Director RET
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