HomeMy WebLinkAboutSWG2023-00284 - SWG Application / Design - 6/30/2023 MASON COUNTY 415 N 6TH STREET, SHELTON,WA 98584
rill SHELTON: 360-427-9670, EXT 400
P
r: 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: SWG2023-00284
APPLICANT BLOSSOM KEITH & ANDREA Phone:
Address: 21 E BOUNDARY RD GRAPEVIEW, WA 98546
OWNER BLOSSOM KEITH & ANDREA Phone:
Address: 21 E BOUNDARY RD GRAPEVIEW, WA 98546
SEPTIC DESIGNER Bob Paysse - Pioneer Digging Inc Phone: 360-426-1803
Address: 3083 E Mason Benson Road GRAPEVIEW, WA 98546
Site Address: 21 E Boundary Rd
Primary Parcel Number: 221045200001
Permit Description: 4-bedroom pressure with a sand lined drainfield
Permit Submitted Date: 06/30/2023
Permit Issued Date: 07/24/2023
Issued By: David Anderson
Current Permit Fees Paid: $525.00 (additional fees may be required upon installation of system).
Permit Expiration Date: 07/06/2026 (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.
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/onsiteloss-inspection-request.php or call:
360-427-9670, extension 400.
OFFICIAL USE ONLY "V
•
DATE RECENED:
MASON COUNTY (p • �(� . 02 c ›
017 COMMUNITY SERVICES AMOUNT RECEIVED:525— RECEIVED BY: n -^C W Cn
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Public Health(Community Health/Environmental Health) /��/T[ < cn
�N2765tre t 56&1400 n�A98584.en1� SwG 202�, - 0 3O21 Z Cl)
415 N.6th Street Shelton WA 98581 Cl) 0
ON-SITE SEWAGE SYSTEM APPLICATION
APPLICANT Pr-,ONF m m
KIETH BLOSSOM �', ; Z
c
MAILING ADDRESS-STREET,CITY.STATE.ZIP CODE
21 E BOUNDARY RD �G G GRAPEVIEW WA 98546 _ m
SITE AD kESS-STREET,CITY,ZIP CODE ` % xi
21 E BOUNDARY RD G GRAPEVIEW WA 98546 I N'
NAME OF DESIGNER r� , PHONE I N
ROBERT H. PAYSSE `''� 360-426-1803
NAME OF INSTALLER PHONE v
TBD I
PERMIT TYPE(select one) IN W W
DRINKING WATER SOURCE i
{
u7 RESIDENTIAL OSS COMMUNITY OSS COMMERCIAL OSS In PRIVATE INDIVIDUAL WELL 5 PRIVATE TWO-PARTY ELL Z
TYPE OF WORK(select one) PUBLIC WATER SYSTEM t
Q
6NEW CONSTRUCTION/UPGRADES Epp REPAIR/REPLACEMENT OTHER DETAILS(select all that apply)) ❑ TABLE IX REPAIR I CJl
SUBMITTALS ❑ SURFACING SEWAGE h7 tXISTING FAILURE ❑SHORELINE
Up DESIGN FORM(REQUIRED) VSEPTIC DESIGN(REQUIRED) BEDROOMS LOT SIZE O I N
'rvAIVER(S)(IF APPLICABLE) 4 0.22 n t
x IO
DIRECTIONS TO SITE AND SITE CONDITIONS:(ex.locked gate)
NORTH HWY 3. LEFT ON MASON LAKE RD. FOLLOW TO MASON LAKE. LEFT ON o
MASON LAKE DRIVE EAST. CONTINUE TO BOUNDARY RD ON RIGHT. SITE IS r I
FIRST LOT ON LEFT. -I o
Ht
ISITE MUST BE FLAGGED FROM MAIN ROAD AND TEST HOLES MUST BE FLAGGED WITH TEST HOLE NUMBERS. I
OFFICIAL USE ONLY BELOW THIS LINE
IUPGRADE I FAILURE SOURCE(for reporting purposes)
❑VOLUNTARY 0 MAINTENANCE/PUMPING 0 BUILDING PERMIT El HOME SALE ['COMPLAINT ['OTHER:
-1 OR SOIL LOG but-
5- COMMENTS/CONDITIONS
- o -/- L5 �Q ,f� 5ffy&
60' �Gi AK - -S l6 �e /Roils of fi)i
TV : (7 L5 4-2 ?" 6I-S
Z1-361, Ye(fy Con p a c+C4A cvi1h fill Pei of 2
36_Go t. v� m S i)/e f llf4(
RECORD DRAWING AND INSTALLATION REPORT
SOIL CODES:
...V. VERY_.G=GRAVELLY S=SAND L=LOAM Si=SILT C=CLAY E=EXTREMELY R=ROOTS REQUIRED FOR FINAL APPROVAL.
1PRSIGTURE
DATE APPLICATION EXPIRATION DATE APPLICATION APPROVED/ISSUED BY DATE
77b/7oz3 7/(/2076 0. — 7(z `f 12073
THIS FORM MAY BE SCANNED AND AVAILABLE FOR PUBLIC VIEW ON THE MASON COUNTY WEBSITE REVISED 12/7/2015
l ,M_.
.
DESIGN FORM—PAGE ONE Assessor's Parcel Number: 2 2 1 0 4 — 5 2 — 0 0 0 0 1
A design will be reviewed when 3 copies of each of the following are submitted:
a ! Completed design form that has been signed and dated. ''Scaled layout sketch,including alllapplicable items on checklist '
Scaled plot plan,including all applicable items on checklist. Cross-section sketch,including all applicanle'i}diii5'� `�iircklist,'_.:.. •
This form ma be scanned and available for .ublic view on the Mason Coun Web site.Maximum •a#er size: II"X 17"
Permit Numbe • SWG 20z3—A '2 el Designer's Name: ROBERT H.PAYSSE
Ap I ' s s Name: KIETH BLOSSOM Designer's Phone Number: 360-426-1803
'L; •ddres: PO BOX 2626 Designer's Address: 3083 E MASON BENSON RD
f��,���0 BELFAIR WA 98528 GRAPEVIEW WA 98546
�v� ity State Zip City State Zip
., _ _ DESIGICPARAMTERS
Treatment Device
• Glendon Biofilter 0 Sand Filter 0 Mound NiSand Lined Drainfield 0 Recirculating Filter,Type:
O'Aerobic Unit Make/Model 0 Disinfection Unit Make/Model Ct!u.°'r;1�' a:;r c 1.:,< �;,,:1-;'.
Drainfield Type
❑Gravity lit Pressure Di Trench 0 Bed 0 Sub Surface Drip
Septic Tank/Drainfield Specifications Laterals
Number of Bedrooms 4 Schedule/Class SCH.40
Daily Flow:Operating Capacity 360 gpd Length VARIES ft
Daily Flow:Design Flow 480 gpd Diameter 1.25 in
Septic Tank Capacity(working) 1500 gal Number 3
Receiving Soil Type(1-6) 1 Separation 9 ft
Receiving.Soil Appl.Rate 1.0 gpd/ft2 Orifices
g
Required Primary Area 480 ft2 Total Number of Orifices •-.4..-::...,_ AO
Designed Primary Area 480 ft2 Diameter 3/16 in
Designed Reserve Area 480 ft2 Spacing 48 in
Trench/Bed Width 3 ft Manifold
Trench/Bed Length 160 ft Schedule/Class SCH.40
Elevation Measurements Length 18 ft
Original Drainfield Area Slope 7 % Diameter 1.25 in
New Slope,If Altered 7 % Preferred manifold configuration used? I 'Yes 0 No
Depth of Excavation Up-slope 24+24=48 in Transport Pipe
from Original Grade Down-slope 22+24=46 in Schedule/Class r l..,,....SCH.40
A Designed Vertical Separation 12+ in Length • '•Sri'' ft 9
Gravelless Chambers Required? 0 Yes 17i No 0 Optional Diameter 2 in
Pump Required? lid Yes 0 No Dosing and Pump Chamber
Pump/Siphon Specifications Number of doses/day 6
, Diff.in Elevation Between Pump&Uppermost Orifice 5 ft Dose quantity 80 gal
* Drainfield Squirt Height/Selected Residual(head) 2 ft Chamber Capacity(flood) 2250 gal
Uppermost Orifice Higher 0 Lower than Pump Shutoff Pump c�pttpl� ch k those required.
Capacity @ Total Pressure Head 23.6 gpm ' er (j'il`' - 2•r I'Event Counter
Calculated Total Pressure Head 14.3 ft If Timer: Pump on 1.5 MIN ,pump off 4 HRS
Ii
MASON COUNTY ENVIRONMENTAL HEALTH
Comments JUL 2 4 NV
DJA
,
"''DESIGN FORM—PAGE TWO Assessor's Parcel Number:2 2 1 0 4 — 5 2 -- 0 0 0 0 1
Permit Number: SWG
DESIGN CHECKLISTS I ` —
Scaled Plot Plan Scaled Layout Sketch Cross-Section Sketch
lil Test hole locations 621 Drainfield orientation and layout Reference depth from original grade:
Iii Soil logs fii1 Trench/bed dimensions and g Septic tank
g Property lines critical distances within layout i ' Drainfield cover
Ed Existing and proposed wells Gil D-Box/Valve box locations Reference depth from original grade
within 100 ft of property g Septic tank/pump chamber and restrictive strata:
ili Measurements to cuts,banks,and locations l2f Laterals,trench/bed,top and
surface water and critical areas l,Z( Observation port location bottom
61 Location and orientation of 6t! Clean-out location 0 Curtain drain collector
curtain drain and all absorption ff Manifold placement 0 Sand augmentation
components
g Orifice placement Other cross-section detail:
iZI Location and dimension of lid Lateral placement with distance g Observation ports/clean-outs
primary system and reserve area to edge of bed
g Other Information
6d Buildings rif Audible/visual alarm referenced Yes No
!id Direction of slope indicator g Scale of drawing shown on scale E6 0 Design staked out
lig Waterlines bar ❑ RI Recorded Notices attached
Iitl Roads,easements,driveways. 0 g Waiver(s)attached
parking 0 g Pump curve attached
0 North arrow and scale drawing 0 g Evaluation of failure
shown on scale bar Non-residential justification
❑ RI Waste strength
❑ 131 Flow
DESIGN APPROVAL
The undersigned designer must be notified by ' staller at time of installation lif Yes 0 No
t:24fisc .4
7izti/ z__.3
Signature of Dcsi er Date
44
The undersigned has reviewed this design on behalf of Mason County Public Health and determined it to b in
compliance with state and local on-site egulations: R� Y
p ED
/Z 41 702--/ASON JUL ? ` 2023
Environmental Health Specialist Date 0(/N
p 71'&vonN
CAUTION: DESIGN APPROVAL IS VALID ONLY UNDER THE FOLLOWING CONDITION: O✓A MENT HEALry
✓ The design is stamped"Approved"by Mason County Public Health.✓ The Onsite Sewage Permit has not expired,the Permit Expiration Date is: 7 /[
r t/ /Z °Z6
✓ 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.
scanned and available forpublic view on the Mason CountyWeb site.
This form may be
Updated Date: 12/7/2015
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MASON COUNTY ENVIRONMENTAL HEALTH
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EXISTING WELL
AN ASBUILTI INSTALL SIGNOFF FEE WILL
BE CHARGED AT TIME OF INSTALLATION
PIONEER DIGGING INC. CUSTOMER: KIETH BLOSSOM TESTHEST HOLE 2
(}IS TES Gas
PARCEL# 2210452-00001 HOLE I: T Is its 47:6 t'i\ SOS .COMPACTION) 1
SEPTIC DESIGNS ADDRFSS: 21 E BOUNDARY RD ROOTS @ 55 RtSS '
DRICLANER THIS IS NOT A SURVEY.REFERENCES INCUUOE.APPUCANTICOUNTY PROVIDED
3083 E MASON BENSON RD. GRAPEVIEW,WA 98546 DESIGNER ROBERT H PAYSSE PLATS OR SURVEYS.FIELD MEASUREMENTS AND COUNTY GIS DESIGN INTENDED FOR SEPTIC
OFFICE 360-4261803 FAX 360-427 2353 SHEET: SITE PLAN SCALE 1"=20' DEPARTMENT/AGENCY REVIEW PROPOSED
SIGNDER NOOTP ESPONSIB E FOR SETBACKS UNRELATED TNT MAY BE SUBJECT TO O
SEPTIC COMPONENTS
AN ASBUILT/INSTALL SIGNOFF FEE WILL /(1�
BE CHARGED AT TIME OF INSTALLATION
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PARCEL# 2210452-00001 0001 Pls 0-27 GLS
I8 60 G c�\4S 27-60 G.MS(SOME COMPACTION)
{ SEPTIC DESIGNS ADDRESS: 21 E BOUNDARY RD ROOTS @ 55 ROOTS @ 53
3083 E MASON BENSON RD. GRAPEVIEW,WA 98546 DESIGNER: ROBERT H.PAYSSE FPuyTSSORSSURVECLMMEID 85�DMEASUREI.ENTST A SURVEY. R REFERENCES
DESIGN INTENDED
OFFICE 360 4261803 FAX 360 427 2353 SHEET: DF DETAIL SCALE 1"=10' PURPOSES ONLY PROPOSED PMENT MAY BE SUBJECT TO OTHER
DEPARTMENT/AGENCY REVIEW DESIGNER NOTRESPONSIBLE FOR SETBACKS UNRELATED TO
_SEPTIC COMPONENTS
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OBSERVATIONyi
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SAND. (X4) 1 ._.._..
EXPIr ES..
RESTRICTIVE LAYER (VERIFIED DEPTH)
JUL 2 4 2023
THREADED CAP 24" RISER/LID MASONCOUNTYENVIRON�dENrq�H
OR VALVE BOX NLrH
DJq
El fib"ORIFICES 012:00
IN/ SHIELDS
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_.._.•_.•_.•.-,•r.e. •r_ ,,,S,0 .1 VALVES CHECK
GLUED TEE VALVES
ADJUST TO # (AS NEEDED)
AN,, UILT/INSTALL SIGNOFF FEE WILL OF LATERALS
BE CHARGED AT TIME OF INSTALLATION
CUSTOMER KIETH BLOSSOM TEST HOLE I: TEST HOLE 2:
PIONEER DIGGING INC. 18-60 G 0-27GLS
7 • PARCEL#:22104-52-00001 GMS 27 60 GMS(SOME COMPACTION)
SEPTIC DESIGNS ADDRESS: 21 E BOUNDARY RD ROOTS @ 55 ROOTS @ 53
D(SCWf4T2,TMSIS� A9U�¢��y,�ccr*,' RE. ENCES INCLUDE'PEST NINTE UNfY PRSEM)
3083 E MASC-N BENSON RD. GRAPEVIEW,WA 98540 DESIGNER: ROBERT H.PAYSSE PUTS ORSNr-'4SetAEABIIREME COONCLUDE ESIGNINTENOEOFORSEPTIC
PURPOSES ONLY. :I:OPQ90 0 OPMENT MAY .GE SUBJECT 0,"- r_G
OFFICE 360 4261803 FAX 360 427 2353 SHEET: DF DETAIL(2) SCALE NA DEPARTMENTGGENCY REVIEW.'Oc51:n._I<;?-"i.ITCN1...3.EF1'R. ,.�_:sla.<w,TEo To I
SEPTIC COMPONENTS.
— 24"RIBBED RISERS W/BOLT ON WATER-TIGHT LIDS
FLEA,\OIJ 1 USE RISER LID ADAPTERS WITH NO GASKET LIDS
D FINISHED GRADE
• -.LT.: ,.. WATER-TIGHT
_ t' ,t i JOINTS
.
INLET
. , Orli OUTLET
TWO WAY TEE Zi-
i'
WATER-TIGHT • I
JOINTS :�„ �i•. •h ;•��
• 1FFIIL R ®VE
TANKS MUST BE
:4:
ON STATE DOH '; /• S JUL 2 4 2023
APPROVED LIST ` •
OF'SEWAGE '. 7. •SQN
COUNTY r�y�RORENTAL HEATH
TANKS .•
*` A
PUMP TANKS VA I ,,..
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OVER 1000 GAL. ••.: 4.
•
REQUIRES TWO d�A1:®���Ar.��.ansan:'•: .
ACCESS RISERS *`. •.4g-- •;' t. •.?: .'z".cd;:; .. ..... ...; ;:t• ,,, ot ww..,�04
TO GRADE �+` • ?i;
•
PUMP TANKS 0.1• RF, �iro"a+,rsse `'
LOCATED AT HIGHER AQUAWORKS - ;;�� ':ix F.,
ELEVATION THAN CONTROL PANEL ExPI;.�s
DRAINFIELD MUST t��nMER EVENT HOUR METER �- ELECTRICAL WORK PONE 24"RIBBED RISERS
HAVE ANTI-SIPHON c BV LICENSED ELECTRICIAN W/WATER TIGHT LIDS
DEVICE INSTALLED. '$
* I - FINISHED GRADE
r I
E LECTRICAL CONDVIT ICI 1 --
TRANSPORT LINE
INLET n
UNION& BALL VALVE
1500 GALLON WATERT/GHT
CONC.-RE IE PUMP TANK
(28.5 GAL./IN.)
WATER-TIGHT
JOINTS
PRESSURE TRANSDUCER 1
(OR FLOATS) I CHECK VALVE
USE TANKS FITTED J W/CAST IN WATER
TIGHT FITTINGS FOR USE RUBBER
INLET/OUTLES AND • PUMP BUCKET: GROMETS FOR
CAST IN RISER BUCKET HEIGHT MUST BE TRANSPORT LINE
ADAPTERS TO AT LEAST HEIGHT OF PUMP — AND ELECTRICAL
ENSURE WATER ON RISERS. MAKE
TIGHTNESS a . " ' • :• • . a SURE ALL HOLES
ARE WATER-TIGHT
T CUSTOMER. KEITH BLOSSOM SCALE NA
PIONEER DIG�1N�, 11 V C. PARCEL# 22104-52-00001 INSTALL TANKS ON ORIGINAL OR
SEPTIC DESIGNS ADDRFSS:21 E BOUNDARY RD COMPACTED LEVEL SOILS. RUN CROSS
1 3083.E,MA.SOON BENSON RD. GRAPEVIEW,WA 98546 DESIGNER: ROBERT EL PAYSSE CONNI CTIQNS INTO ORIGINAL SOILS TO
OFFICE-360-426-1803 FAX-360-427-2353 SHEET: TANKS SCALE NA AVOID SE'T1I JG. '+
t
DINO Pumps.
4
Pump Specifications I
280 Series 1,'2 hp it
Submersible Effluent Pump
Linn{PER WW1
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0741001117110..1. N COUNTY E DJA Nr+IENTAL HEALTWJ
. a'wr.auu..e..r r.r.r..r li.i....10..4.1Prr... let
LATERAL LATERAL FEEDER TOTAL ORIFICE ORIFICE ORIFICE DIST.TO TOTAL TOTAL
LATERAL# LENGTH PIPE SIZE LENGTH LENGTH DISCHARGE SPACING 1ST ORIFICE HEAD
SIZE(inch) ORIFICES
(feet) (inches) (feet) (feet) RATE(gpm) (feet) (inches) (reef)
1 48 1.25 3 51 3/16" 0.59 4 24 12 0.39
2 56 1.25 9 65 3/16" 0.59 4 24 14 0.67
3 56 1.25 18 74 3/16" 0.59 4 24 14 0.76
DRAINFIELD HEAD(feet) 1.82
TRANSPORT UNE HEAD(feet) 0.50
ELEVATION CHANGE(feet) 5
RESIDUAL/SQUIRT(feet) 2
FXTRP-LQSS/FITTINGS(feet) HAD
rgrrt.ifrti
TOTAL DYNAMIC HEAD(feet) 14.32
TOTAL GALLONS PER MINUTE 23.6
PIONEER. DIGGING, INC. ARCOEIM#E2210-00001M
SEPTIC DESIGNS ADDRFSS: 21 E BOUNDARY RD
3083 E MASON BENSON RD. GRAPEVIEW,WA 98546 DESIGNER: ROBERT H.PAYSSE
OFFICE-360-426-1803 FAX-360-427-2353 SHEET: CALCS SCALE NA
1,e'wk; WifiTTIPiGS!feet). 1
installation & System Notes
1. Installer must contact designer for final inspection of the installation prior to cover. All components, including tanks, lids,
transport line,drainfield,and water lines must be open for inspection. A$350.00 fee will be charged for time involved with the
inspection of the installation and creation of the record drawing. The designer reserves the right to charge additional fees if
multiple visits are needed due to installation errors or inaccessible components.
2. This septic design must be installed by a certified installer with the local health department. All components shall be installed
according to state,county,and manufacturer requirements. For Homeowner Installs,the owner must get approval from the
designer and local health department prior to attempting installation.
3. Designer is not a surveyor. Installer must familiarize themselves with property line locations prior to installation. Any
confusion or conflicts with line locations should be reported to the property owner. A licensed surveyor may be necessary prior
to installation to confirm all line locations. Any discrepancies found must be reported to the designer immediately.
4. Drainfield area may only be cleared by a licensed installer familiar with sensitive drainfield area preservation. The builder, lot
developer, or property owner shall not clear the drainfield area. Any clearing required for drainfield installation shall not
remove or disturb any top soil in Primary and Reserve areas. Removal or disturbance to drainfield soils could render design
void.
5. The property owner and installer are responsible for locating all underground utilities (ex. water,gas,electric) prior to
installation. Any utility locations shown within design drawings are likely approximate and may not be exact.
6. All proposed tanks must be installed on original soils or compacted gravels. Extend all tank connection lines out onto original
soil to avoid settling issues. Risers and lids must be brought to finished grade and left accessible for future operations and
maintenance. Component manufacturers (ex. ATU,Glendons,) may have other requirements not listed within this design.
7..Aikelectrical wiring shall be done by a licensed electrician or homeowner(if allowed)and-rn t;be permittedthpough Labor
and Industries.
8. The proposed septic system should be installed in dry weather conditions. Any failed attempts at installation during wet
weather conditions may render this design void.
9. Maintain 10ft to waterlines with all septic components. If less than 10ft is required,sleeving in sch.40 pvc is required. If
sewage transport lines and waterlines must cross, waterline must be 18" above sewage line with one of the lines sleeved in sch.
40 pvc 10ft in each direction of crossing.
10. This design may include waiver applications with specific mitigation measures pertaining to installation,operation and
maintenance of the proposed components.
11. Stormwater runoff,footing drains, roof drains must be diverted away from any septic system components. No curtain,
foundation, perimeter drains shall be installed 30ft downslope and 10ft upslope of drainfield--cease raermittodttt ro'a-sh
12.This design is site specific and intended to meet state and county requirements that are related to the system components
being proposed. Any placement of proposed buildings, proposed wells or other non-related items on these drawings may or
may not meet other requirements.
13. All onsite septic systems require regular maintenance to verify satisfactory operation. The system owner/operator is
responsible for the continuous operation and maintenance of the system per WAC 246-272A. For op i- Md maintenance
information, refer to Mason County Public Health Homeowner's Manual,which should be received after instafiaA p
14. System owner should be cautious of landscaping around septic components. Root intrusion JUL ,
can cause premature failure of the drainfield area. In addition, bushes and trees should be kept MASON ' 2023
away from lids and other septic maintenance points. • 'NNTyENyf
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`1,1-tchanges made at time of installation may impact designer calculations, pump sizing,'a^ " " .;iit� .+;.' '"� !"•11
compliance w/county and state requirements. Contact designer prior to install w/any
proposed variations from design. Changes may result in additional fees and permitting.
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3083 E MASON BENSON RD. GRAPEVIEW,WA 98546 DESIGNER: ROBERT H.PAYSSE EXPIRES
OFFICE-360 426-1803 FAX-360-427.2353 SHEET: NOTES SCALE NA
Sand Lined Trench Systems-Recommended Standards and Guidance
Effective Date: March 2014
Introduction
Sand lined trenches provide biodegradation or decomposition of wastewater constituents by bringing
the wastewater into close contact with a well developed aerobic biological community attached to
the surfaces of the filter media. This process requires unsaturated downward flow of the effluent
through the filter media. The media may be coarse mineral sand or equivalently sized crushed glass
meeting one of the media specifications listed in Appendix A. As a departure from the intermittent
sand filter, the media is not contained in a watertight vessel. Instead, the media is placed in trenches
or beds in the native soil. Proper function requires that influent to the sand filter be distributed over
the media in controlled, uniform doses. In order to achieve accurate dosing, these systems require
timed dosing with associated pump chambers, electrical components, and distribution network, with
a minimum of 4 to 18 doses per day(depending on sand media used) spread evenly over a 24 hour
period. The effluent is absorbed into the native soil at the bottom of the sand lined trenches, which
accomplishes dispersal into the subsoil environment and some further treatment. A sand lined trench
is a combined treatment component and soil dispersal component.
Possible Applications:
A sand lined drainfield trench (sand filter) may be selected for a site with excessively permeable
(Type 1) soils. The addition of 24 inches of filter media(coarse sand) to a pressure distribution soil
dispersal component provides the wastewater treatment not provided by the Type 1 soil. Treated
wastewater is discharged directly to the receiving soil for dispersal into the subsoil environment.
See Figure 2.1. If the soil adjacent to the layer of drainrock atop the sand media is Type 1,
additional filter media sand or an impervious material must be placed between the type 1 soil and the
drainrock making up the trench's sidewalls and end walls to prevent short-circuiting. When sand is
used for protection against short-circuiting, a minimum of six (6) inch width of filter media sand is
required. The sand bed under the drainrock will also be widened by six (6) inches on each side. See
Figures 2.2 and 2.3. When an impervious material is used, it must be 30 mil PVC and must extend
from above the gravel bed to six (6) inches below the graveVsand interface. See Figure 2.4.
A sand lined drainfield trench (sand filter) may also be selected for a site that has its more suitable
soils for dispersal (and further treatment) at a depth greater than three feet. Filter media(course
sand) is placed below the drain rock to provide adequate levels of treatment so deeper soils more
suitable for dispersal into the subsoil environment can be "reached." See Figure 3.
A bottomless sand filter is a special case of sand lined drainfield trench in which a 30 mil PVC lined
enclosure is designed and installed for containing the distribution system and/or filter bed above grade.
It is quite similar operationally to an intermittent sand filter, but is not lined on the bottom. A
bottomless sand filter is selected typically to utilize more suitable soils high in the soil profile for
dispersal and treatment. The enclosure for the filter bed must be designed by a professional engineer if
the containment walls are over four feet in height measured from the bottom of the footing to the top
of the walls. See Figure 4.
APPROV
JUL 2 4 2023
MASON COUNTY ENV;'
D.
DOH 337-013 Page 7 of 31