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HomeMy WebLinkAboutswg2025-00149 - SWG Application / Design - 4/1/2025 MASON COUNTY 415 N 6TH STREET,SHELTON,WA 98584 .I SHELTON:360-427-9670,EXT 400 BELFAIIR:360 275-4467,EXT 400 Public Health & Human Services ELMA:360-482-5269,EXT 400 FAX:360-427-7787 On-Site Sewage System Permit: SWG2025-00149 C 047c/i APPLICANT BARWICK THOMAS R&SUSAN M Phone: Address: 141 W MARVIN WAY SHELTON, WA 98584 OWNER BARWICK THOMAS R&SUSAN M Phone: Address: 141 W MARVIN WAY SHELTON, WA 98584 SEPTIC DESIGNER PAULA JOHNSON* Phone: 360-898-2255 Address: 171 E VUECREST DRIVE UNION,WA 98592 SEPTIC INSTALLER MAPLES EXCAVATING Phone: 360-463-8474 Address: 911 SE ARCADIA SHELTON, WA 98584 Site Address: 141 W MARVIN WAY Primary Parcel Number: 420367500030 Permit Description: Non-conforming 3bd pressure trench Permit Submitted Date: 04/24/2025 Permit Issued Date: 05/05/2025 Issued By: Rhonda Thompson Current Permit Fees Paid: $825.00 (additional fees may be required upon installation of system). Permit Expiration Date: 05/01/2026 (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 Drain field 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/onsite/oss-inspection-request.php or call: 360-427-9670, extension 400. OFFrillii."111111.1.1111111111.11111111111111111111111111.11111111111111111111.11111.11.1.11111.111111.11ICIALUSE ONLY MASON COUNTY DATE RECEIVED: ,4 4 025 (,', _ 2 en 0AMOUNT RECEIVED: RECEVED BY: 1�—Q W rn Public Health & Human Services 640 ��.,� o < Ia m Environmental 15 . h -Health Shelton, WA 985,ext.400 or 360 275�467,ext.400 S W G 2U z� v V' (q O m 415 N.6th Street-Shelton,WA 98584 z CA ON-SITE SEW. E SYSTEM APPLICATION m• n APPLICANT P:-ONE r Thomas Barwick 4 ,41 (360)888-7422 MAILING ADDRESS-STREET CITY,STATE ZiP CODE 4.Z% F 141 W Marvin Way J/(I: o helton WA 98584 m SITE ADDRESS•STREET.CITY ZIP CODE \`// q,/ same �j Q V` NAME OF DESIGNER PHONE I (v Arrow Septic Designs, I • 0 4` (360) 898-2255 NAME OF INSTALLER PHONE W I c) Maples Excavating �A, (360)463-8474 D I w PERMIT TYPE(select one; DRINKING WATER SOURCE �^ i MI RESIDENTIALOSS r1;COMMUNITYOSS hCOMMERCIALOSs ptlTT W :PRIVATE INDIVIDUAL ELL t-.I±PRIVATETWO-PARTY WELL Z rr TYPE OF WORK(select one) PUBLIC WATER SYSTEM , ff NEW CONSTRUCTION I UPGRADES it REPAIR I REPLACEMENT OTHER DETAILS(select all that apply) 0 TABLE X REPAIR I SUBMITTALS El SURFACING SEWAGE EXISTING FAILURE CI SHORELINE pp; 0 I Ul II DESIGN FORM(REQUIRED) SEPTIC DESIGN(REQUIRED) BEDROOMS I LOT SIZE WAS LOT CREATED AFTER 4/1/2025, ff WAIVER(S)(IF APPLICABLE) 3 BR 1 7.8 ac ❑ YES Q NO C7 1 I DIRECTIONS TO SITE AND SITE CONDITIONS'(ex locked gate) Head east on W Alder St toward N 6th St. At the traffic circle, take the 1st exit. Slight (R) I o onto S 1st St. Turn (R) onto W Marvin Way by mile marker 2. Pink ribbons on the tree by o I o the road - left side -test holes on hillside. To reach house, stay to the (L) at the 'Y'. There's -, a small '141' sign. I co SITE MUST BE FLAGGED FROM MAIN ROAD AND TEST HOLES MUST BE FLAGGED WITH TEST HOLE NUMBERS. I O OFFICIAL USE ONLY BELOW THIS LINE UPGRADE)FAILURE SOURCE(tar reporting purposes) ❑VOLUNTARY ❑MAINTENANCE/PUMPING ❑BUILDING PERMIT ❑HOME SALE ❑COMPLAINT ❑OTHER INSPECTOR SOIL LOGS COMMENTS(CONDITIONS 0 3zC 0 Li Jc ) ; 3 z j� �-4- fit I iwi.-moo S� c v\-2,- RECORD DRA'kMNG 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. INSPECTOR SIGNATURE DATE APPLICATION EXPIRATION DATE APPLICATION APPROVED'ISSUED BY DATE Gri'I S t Z< ( Ijc1Sz � A !RMY MAY SCANNED AND AVAILABLE FOR PUBLIC VIEW ON THE MASON COUNTY WEBSITE Revised:4/14/2025 V .. _. DESIGN FORM-PAGE ONE Assessor's Parcel Number: 4 2 0 3 6 - 7 5 - 0 0 0 3 0 A design will be reviewed when 3 conies of each of the following are submitted: 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 Coun Web site.Maximum wii r size: 11"X 17" -- ; ' ,•:.:4 -Al .i.,:-.j. :- . .: -,:'..:,1.;,:: - --', -- . . '' ' - '-- , • - - -: '`- Permit Number SWG 2074.. voiyff Designer's Name: Arrow Septic Designs,Inc Thomas Barwick Designer's Phone Number: (360)898-2255 Applicant's Name: Mailing Address: 141 W Marvin Way Designer's Address: 171 E Vuecrest Dr Shelton WA 98584 City State Zip Union, WA 98592 City State Zip Designer's Email _paulaj@hctc.com Treatment Device 0 Glendon El Sand Filter CI Mound 0 Sand Lined Drainfield 0 Recirculating Filter 0 ATU U Other Treatment Level(check all that apply): 0 A 0 B 0 C 0 BLI 0 BL2 El BL3 1;VE D N Drainfield Type El Gravity g Pressure GC Trench CI Bed 0 Sub Surface Drip Septic Tank/Drainfield Specifications Laterals Number of Bedrooms 3 Schedule/Class 40 Daily Flow:Operating Capacity 270 gpd Length 33.5 ft 1 Daily Flow:Design Flow 360 gpd Diameter 1.25 in Septic Tank Capacity(working) 1,200 gal Number 6 Receiving Soil Type(1-6) 4 Separation 5 ft Receiving Soil Appl.Rate 0.6 gpd/f12 Orifices Required Primary Area 600 ft2 Total Number of Orifices 42 Designed Primary Area 603 ft2 Diameter 3/16 in Designed Reserve Area 603 ft2 Spacing 60 in Trench/Bed Width 3 ft Manifold Trench/Bed Length 201 ft Schedule/Class 40 Elevation Measurements Length header ft Original Drainfield Area Slope 10 % Diameter 1.25 in New Slope,If Altered 10 % Preferred manifold configuration used? lir Yes 0 No Depth of Excavation up-slope 11 in Transport Pipe from Original Grade Down-slope 8 in Schedule/Class 40 Designed Vertical Separation 13+ in Length 40 ft Gravel-based Drainfield Required? 0 Yes 6 No Diameter 2 in Pump Required? lif Yes 0 No Dosing and Pump Chamber Pump/Siphon Specifications Number of doses/day 4 Diff.in Elevation Between Pump&Uppermost Orifice 5 ft Dose quantity 90 gal Drainfield Squirt Height/Selected Residual(head) 2 ft Chamber Capacity(flood) 1,000 gal Uppermost Orifice 0 Higher 5tf Lower than Pump Shutoff Pump controls:Please check those required. Capacity @ Total Pressure Head 24.78 gpm liti Timer )6 Elapse Meter ) Event Counter Calculated Total Pressure Head 8.26 ft If Timer: Pump on 2 minutes ,Pump off 6 hours Comments APPROVED MAY 05 2025 Revised:4/14/2025 1 9 MASON COUNTY ENVIRONMENTAL HEALTH RET , DESIGN FORM—PAGE TWO Assessor's Parcel Number:4 2 0 3 6 — 7 5 -- 0 0 0 3 0 Permit Number: SWG DESIGN CHECKLISTS Scaled Plot Plan Scaled Layout Sketch Cross-Section Sketch BS Test hole locations 0 Drainfield orientation and layout Reference depth from original grade: g Soil logs Eiti Trench/bed dimensions and EZ1 Septic tank Property lines critical distances within layout 1 Drainfield cover 0 Existing and proposed wells D-BoxiValve box locations Reference depth from original grade within 100 ft of property 1 Septic tank/pump chamber and restrictive strata: ❑ Measurements to cuts,banks,and locations PI Laterals,trench/bed,top and surface water and critical areas Observation port location bottom ❑ Location and orientation of g Clean-out location 0 Curtain drain collector curtain drain and all absorption g Manifold placement 0 Sand augmentation components r Orifice placement Other cross-section detail: 0 Location and dimension of Lateral placement with distance 0 Observation ports/clean-outs primary system and reserve area to edge of bed 0 Buildings Other Information g Audible/visual alarm referenced Yes No Direction of slope indicator Ql Scale of drawing shown on scale El 0 Design staked out ❑ Waterlines bar ❑ at Recorded Notices attached 0 Roads,easements, driveways, 0 Elevation benchmark and relative 0 0 Waiver(s)attached parking elevations of system components 0 0 Pump curve attached 0 North arrow and scale drawing g 0 Evaluation of failure shown on scale bar Non-residential justification 0 Ed Waste strength � ❑ Ct�Flow D �e > AL The undersigned designer must be notified by 1 a, lation 0 Yes 0 No Signatur4 b1:Si_GIV Date OR -�'ESSi \i 3-55- 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: cm 51 sl 7-s' Environmental Health Sp cialist Date CAUTION: DESIGN APPROVAL IS VALID ONLY UNDER THE FOLLOWING CONDITION: ✓ The design is stamped"Approved"by Mason County Public Health. �`� ,7 The Onsite Sewage Permit has not expired,the Permit Expiration Date is: f l i(t ' ✓ 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. This form may be scanned and available for public view on the Mason County Web site. Revised:4/14/2025 Arrow Septic Designs 171 E.Vuecrest Dr. Union,WA 98592 April 18,2025 Mason County Department of Health Services 415N6thSt Shelton,WA 98584 RE: Thomas Barwick(Parcel#42036-75-00030)Evaluation of Failure Dear Inspector: Attached is a replacement septic design for a property located at 141 W Marvin Way, Shelton, WA 98584. There is an existing 3-bedroom home built in 1973 that ties into a gravity septic system of the same era. There are no original septic records for the permit or the installation. The existing system has a 1,000 gallon 2-compartment concrete septic tank followed by a gravity drainfield of unknown size. The septic area is very wet from hydraulic overload.The septic system was recently pumped for the home sale,and there was sludge and water coming back from the drainfield. The old tank is old and undersized so it is to be decommissioned or removed and replaced with a new 1,200 gallon minimum 2-compartment septic tank with an effluent filter. The septic tank will be followed by a new 1,000-gallon pump chamber. The new drainfield consists of 600+s.f. of shallow pressure trenches using an application rate of 0.6. The system will also have a control panel including timed dosing,a counter and elapse meter to prevent overuse and facilitate ongoing operation and maintenance.This is a non-conforming repair with 12"+of vertical separation. There are no surface water or well setback issues and we have designated a full reserve drainfield area. The property owner's contact information is as follows: Thomas Barwick 141 WMarvinWay Shelton,WA 98584 (360)888-7422 If you need further information,please contact my office at(360) 898-2255. Sincerely 0,4•.4% APPROVED � • •ti . MAY 0 5 2025 MASON COUNTY ENVIRONMENTAL HEALTH 5104349 PAULA JOY JOHNSON.1'' RET 411 i s as ewa er Treatment System Designer 144 20F9 4 ii t bE 3 I , 11f. 4hl �,ril '//" F--rt. ii )' g ,12i, o . s-I lit !el. 1 s o a,V ti III iffij ::1K ' ` .0 n 3 n i!4i<0 i E o k< p :z.`42, A,11 ti'1` ll° 1 1"p ' �et O o i . .. Wit` c 9 C h I ii v IU ?. TJIt1 a �i ;: gh hi ra $ =! 2 $ lo-u-! $!o V im, 2 O aC ll ' °®o — .i a_v_.-....il_.t..3.*...•.../.:-31—D o4:.i,tii • ty . 7C 4- t� I o k % It i u. r0at air �i: it o s$ hi ' g Ii -E . 7_ s$ '� !4 a•' Q 8L _, a 11 : a $• . ., 64 t �, 1, i` {DUI coa kN t1 •.<.0441 N 088 QM'. f O` i Q i { e 'E .• _' _ sbifilCI i •1 k -kJ': Y j j t8_ 8 ' Qo 1 ' I '117 • S�.., U1 .41 Q� z ! 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Et ,..- , - r4 ' 11F-ica..\ .a ( I 4.,\4,y4,. Ce•e,--ivoi, igoo c kee-xest..- • ‘; ‘141.1.4.ves , . • • - . ,t, V 1.4„...... ,., 5:1...v. eaef )loec _ _ . --- . • • i L a . . •e-1 • , • 10"*" • -' '''Si.V%i2et '' -.4".45:&- i- L.C.,,e* -% d (co , a . , cAL 4 • • 0 T. 1 4.-.1. is 2.° i . Detailed Dr dim-teic • 7 . LcycuTi .— }0r aeNierwe'der+ k"'-t - .S.e. ;• •IV 4 .=-2-. c-rce= r----r-----7---..•.n•----T„ ' • • q to 12' 1 i i if , —. .APPROVED , , 3,4- . , 2't • . • in it 1 2-1/2" 1,........, Colb•—•- %ZS' ±.. c.- ti" MAY 45 2025 c 'rin _i ,....., i- - • .7L. Reck ... MASON COUNTY ENVIRONMENTAL HEALTH 7 1,- . 1 . R ET . I . So-atr-Cr. Cep 1 .54 • • 45 PegrEe Erler ic Resoictve Loyc• 2 of .. . . • • ›.4444,,j Drcinfield • Cr'oss-Secticr. View • . De-p.a - Coon Ow: . . . NG To ScOe • .. • . NG Ciegeler.1 10 'W free J 6'ix-Aes teiow Peelc o - Cbscrycei:r. 7--cr: 'To Se 4 Pic Pew :ram ScCtoco of TrG,ora X-e.... G SW • To Frit.hed &tee: Raccovotie Cep Si•• be A - !needed en Otceerjoilen Pert Nee. Anc.'xr 01; Setae WIZ GeseE-On Tee- 01.. .46t) - - Arrow Septic Deign• s hair= et(2 Teed Rect.:red•i-i Sys.eee • ' :0 . ...,- . it. .1-1 . •. '4 . ••.1.i"?'. 5143 . •.I,. 49 ..•e J"5.ct PAULA JOY JOHtaf .•-'' Al ..rittisl8t ugiNte EXPIRES 1 ' • Length Length Orifice # Distance from Distance from Lateral# (In.) (Ft.) Spacing Orifices Feeder Line(In.) Cleanout(In.) 1 402 33.5 60 7 21 21 2 402 33.5 60 7 21 21 3 402 33.5 60 7 21 21 4 402 33.5 60 7 21 21 5 402 33.5 60 7 21 21 6 402 33.5 60 7 21 21 Total Lateral Length 201 Total#Orifices 42 I GPM = 24.78 Dynamic Head Calculations Selected residual pressure: 2 ft. Length (Ft.) #Orifices Transport Pipe 40 42 0.44 ft. Feeder Total Lateral Line Length Lateral#1 33.5 2 35.5 7 0.10 ft. Lateral#2 33.5 7 40.5 7 0.12 ft. Lateral#3 33.5 12 45.5 7 0.13 ft. Lateral#4 33.5 17 50.5 7 0.14 ft. Lateral#5 33.5 22 55.5 7 0.16 ft. Lateral#6 33.5 27 60.5 7 0.17 ft. Total Elevation Lift 5.00 ft. Total Dynamic Head by. 8.26 ft. i , %03 .j ' 51-DO 3.9 '. '.4) %0,: PAULA.JOY JO;iNSON .S. Llorivsr_briESIGhs;a ':'}` ���euPSi i 6it ��5 5 0 APPROVED M 0 5 2025 MASON COUNTYAY ENVIR0N..ENTAL HEALTH RET I y,-: 1�� 1+ " • Bronze construction available(139 series) • High head version available(145 series) • Double shaft seal versions available for added protection on models 140/145. Flow-Mate For more information,see Technical Data Sheets FM2782,FM2783. In high head dewatering or effluent applications where pumping a11+vaEa:asLuw�EcuavE performance is critical, this robust - 4_ ', 13214914 family of pumps is known for reliability, —_. •durability and performance. These r- , ,11111111111.11111111111 pumps are especially suited for harsh ' ,11111111111111111111111 environments.Zoeller's cool run design C and corrosion-resistant,powder coated Ell u KIIILIIIIIIII•111 E epoxy finish add up to a long-lasting l ■■„■■.■��� 3 trouble free product. . " ,I'.■■■■■■. Ill APPLICATIONS: s r .■,,,•■■■■■ r .11 • STEP or onsite applications 1„ n ■■MIIIM1111:: C • Water transfer =' � � ��� , Ill • Light commercial dewatering • , ■■■ ■�■", �� "i SPECIFICATIONS: ' - ■■■.,,�"■■ • 1-1/2"NPT discharge ■■.■■,',`■■ • 1/2 HP through 1 HP MADE IN THE USA ; ■.■■■„■',. • Available in automatic or nonautomatic OS11611001 r1 Of llIVEIK • Model 137,139,140:1/2"(12 mm)spherical solids 11111111111®11111®® la s Y •. i la SO Tx capacity with vortex impeller GYlt. • Model 145:3/4"(19 mm)spherical solids capacity with o,As a . ,,,,„n ,: ;szs 0 vortex impeller n 151 1 N f • wlW PUMP PERFORMANCE CURVE `�' '"'' I MODEL 151/1521153 Dose-Mate _ @ so This is our fastest growing line of effluent 14' as 153 pumps.The 150 series is truly a workhorse designed for reliability under extreme 12— 4 conditions in an effluent environment. 35 150 series pump curves cover a wide range s ,0- 152 of applications. They are well suited to `' 30 applications with low pressure pipe(LPP) 8- 25 151 and enhanced flow STEP systems.Zoeller's coot run design and corrosion-resistant, 5 s_ 20 powder coated epoxy finish, in addition to the hermetically sealed, oil-filled motor 15 and non-clogging vortex impeller add up to 4— a long-lasting,trouble free product. 10 O 2- APPLICATIONS: J s • STEP or onsite applications A.--.,01.-. 0 MADE D uIIN TITHE CIA 10 20 30 40 50 60 70 80 90 100 • Light commercial dewatering fii GALLONS LITERS �. p �^ 2QO4D280 320 360 SPECIFICATIONS: i�,4(R.O�I P�{I_yM J'::CE • 1-1/2"NPT discharge ,� • 3/10 HP through 1/2 HP ' MAY 0 5 2025 ri • Available in nonautomatic or with a variable level MASON��UN piggyback mechanical switch rY ENViROHMEh'TAL HEALTH • 1/2"(12 mm)spherical solids capacity with vortex r thermoplastic impeller RET For more information,see Technical Data Sheet FM2784. ©All rights reserved. ZOELLER PUMP CO. 1502-778-2731 1800-928-7867 I zoellerpumps.com 9 1 v F. 9 ' . -----. -- 1 - I ser,,NR2- Virig Vg1777 • 6uvef" 24'12Aar;3' \ ; ' I : 1 . 1 Ar.. 15 ' i --------------- / \ --------- --... -14:... ''.."j--- 6 1 1 I 1 -"-_-------------- ---%---=---."----=--=-7--..... --------- ==-----=--=--'-----' 1 I I . 1 ; ----.--------- --' - 1 iI I -_-----T--------', -------=------- ----------- I - 1 ?. ....i i t ! : 1•••••••••••• cm.t r......i . . • : ......• 7--' i 7, Kite 1 1 -----6-1- ; •-...;-- •-•---1.-10,: ' ''="93-.. 7 i I I • t i • c : : ; • ; i I SOURCE i i 1 ; ! 4 . • ; .01ACIWID I sicijseer i : 1 I i I t 1 MIMI I 1 I : i 1 fb&C) G9•9-53-V\ 1 i 3 I 3 ::31raltETS i E 1 i '''......• .m......, ......,......j=,....................r,=..., 'VN,Ltx........................ ! • i 1 1 ' 1 I i I i i i 1 ! : • 2 raw,. • I MAY 0 5 2025 I MASON COUNTY ENVIRONMENTAL HEALTH t 1 ,......... ;,,. lit.7 r-:a -- UON I TMEADEE, NZ . i rtg''' ci.ANET , Af":5C IMER. N I FIICSE MOE s. . : Sinal I YAM* N.., i It ,---L,.------- p = / !I I mom SEP= TANK :14-7 jp,! . LI: 5": ."61.T"-'—'• .",.g.......... ...re.=... -'."T • % ‘....A...7.---:..------>7012/1AINANILD ------7-----------7-7 1 1 _ . I • 1 i ..--•*--, -.=.-,---- ! i : i I • • ; I HIM WATER ALARM LLYM 10- t : ; VALVE NORMAL TM=OFF LEM 3 ........... 7.! : - ; ;3 3 -32Er. STEM 1 el=25FM ---...w• . ...., .,. $-4-, ir'N,,L_' Mg Mall' MLWEIVEE i 1 1 ) i e-e- G4U1SbV\ MEMegfr NOW4A‘z *-------_ . •-- -'L.-- .-.-•=-, i i M'l , : 1 1 1 '(_er. 4 Caftc,1"- 1 grztewirrs _ , f . ! WiNgtaggiE IA C • 1 1 - 1 \\k-it\-A-As-V -Ak-‘AA U PC111:5 etr4.10a17431, . :31MECFUSAi. PUMP c .e.TYPCALI =AZ. 11ED i I 1 i I i **Nc,•=: Septic Tanks mist meet s"-=:...ndarri.s. rszp.... red ill:,WAC chapter 245-272C gvauRe- 2 i 1 , 1 - i and rnani.:tacturer nnus-::Pe on-h:.,.e Dept of'ri==ith ilst C.vr reFL_eterat save-age tanks.---.". i • , . if. 1 rci S 0 f 9 • axiom Septic De/sign/3, V/Wr Imo( ,0,rA• �.� INSTALLATION & MAINTENANCE ' ' Pressure Distribution Systems y, : N 5100349 •._/. PAULA JOY JOHNSON •, 1. Install Laterals with contour of the ground. ZN :* 2. Install trench bottoms level. 3. Install locator tape or rebar at each end of all drainfield laterals. Lf'C S^LS 4. Install observation ports as indicated on the plot plan. One required at distal end of each lateral in drainfield with bottom extending to the drainrock/native soil interface. Glue "T"to bottom so Observation Port cannot be easily removed from ground. Install removable cap on top of port at final grade level. 5. Install drainfield during dry weather and soil conditions; any soil smearing must be eliminated by hand raking. 6. Install threaded clean-outs at the end of all laterals (cap must extend to within six inches of finished grade and be marked with locator tape or rebar). 7. Install audio/visual high water level alarm. 8. Install 1/8"mesh non-corrosive pump screen(min. 12 sq. ft. surface area,not to interfere with controls or floats.) Or pump screen may be substituted with Bio-Tube in septic tank and block under pump. Pull bio-tube every 6-12 months and flush back into tank. 9. Install anti-siphon valve above pump in pump chamber to prevent the pump chamber from siphoning into the drainfield. 10. Install check valve in pump outlet line to prevent system from draining back into the pump chamber. 11. Tee to Tee construction between laterals and manifold with orifices oriented at 6 o'clock. Install laterals to the manifold with the orifices at 12 o'clock, (do not glue), after pressure test and Environmental Health Dept. approval,turn orifices down (6 o'clock) and glue laterals to manifold. Orifice shields may be used with orifices in the 12 o'clock position in lieu of turning the orifices down to the 6 o'clock position. 12. Filter fabric required over drain rock prior to back filling. If the drain rock extends above natural grade, run the filter fabric at least 2 inches down the trench wall. 13. Waterlines must be a minimum of 10' to any tank or drainfield (a reduction to 5' may be obtained with a State waiver on lots that meet minimum lot size). Encase all water lines within 10' of septic transport lines and under any driveway/parking areas. 14. Divert all storm water runoff away from on-site sewage system. 15. No curtain drains allowed within 10' of the up-slope edge or 30' of the down-slope edge of the drainfield and reserve area. 16. Have the septic tank and pump chamber pumped or inspected every 3 years minimum. 17. No vehicular traffic over drainfield area or tanks. 18. Inspect floats, clean filters,and test high water level alarm every 6-12 months as needed. 19. All materials and workmanship must meet County and State regulations. 20. Deviation from this design without prior approval from the Designer and Mason County Environmental Health Department will make this design null and void. 21. All manhole lids and access, sampling or inspection ports must have locking covers and be located at ground level. 22. All pressure systems with a pump chamber outlet higher than the drainfield must have an anti-siphon valve or a 1/8"hole drilled in the discharge pipe above the pump to prevent siphoning. Ensure anti-siphon hole sprays down/away from t. • •- •s •. 23. All transport lines under driveways or parking areas must be,'':. � tr•Oebt EuLg. 24. Homeowner is responsible for all property lines and easements. MAY 0 5 2025 9 of MASON COUNTY ENVIRONMENTAL HEALTH RET