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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 �iw iz ADAM J.HURTER •� MYERS ME3 Capacity titers per minute 0 50 100 150 200 250 I } I I I l 40 ---12 1 i : I y --10 d'1 30 +,,0 eis = F to .''A � t A , 4 43 I- 10 4\l'eSI ' 1 '' ' 0 —0 0 10 20 30 40 50 60 70 Capacity gallons per minute { r"4, a 1 `,,, 1O 2 RONMF1A\\-\ k 10/9/25 ti,PSO JO" . . 17'/9 11VO»7 ,A ADAM J.HUNTER (i(.H.:-.1.:1t l'i:tip-\".. xuz,X�...e.i!' .E: ,.., 26 0' 565'± SCALE-1"=100'-0" / 99 100 �4' / / WET NDs �o ,• - �(,� s 3 4 / ':�i,i/ 6 O • II O REEK-e\fi - /� , - v 159 „ '° t o t0, '----- i /' 6 / • f a� 4 \J/ i� 07/y PROPOSE ALVE BOX(IE.-100.3► �sT SEE DETAIL � 45' / / % sn J/ /' ORIGINAL LOT 1 /�///�/�//�/// /7 // /) 4///p /` /// /�.// //��. \Qo 10/9/25� • ///// ///�//4s s y /// / y \cn _ / 01 40' /\ 1111',\1111 \ r 51 ,,' 9 / \111111111 O 1111111 11 /� ADAM I.HUNTER .,. Gam WV% vi� d / . ,. uli}u 401 / "„1' 26 'RBM IS GROUND .@ T.H.1(RBM=100.0) / F ��0 � � - \ o X40 -� T 110,WETLAND BUFFER • RE - /SCALE 1"=so' / UPStOPE OD EEPtR Ti--c,�J. KB FER \` OOH✓NSLOPE�� OF � 150.-OREE \ \A ` LOT 3 \ \ f'k . VET TANK DETAIL-NO SCALE r SAN 2 1 L:`j~ ,,,,,,,,,cc T { 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