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Home My WebLink AboutBLD2024-00283 Retaining Wall - BLD Application - 3/5/2024 MASON COUNTY COMMUNITY SERVICES PermiLN PERMIT ASSISTANCE CENTER: K t •BUILDING•PLANNING•PUBLIC HEALTH•FIRE MARSHAL 615 W.Alder Street,Shelton,WA 98584 Phone Shelton:(360)427-9670 ext 352•Fax:(360)427-7798 Phone MAR 0" 2024 Belfair.(360)275-4467.Phone Elms:(360)482-5269 BUILDING PERMIT APPLICATION 6 1 5 W. Alder Street PROPERTY OWNER INFORMATION: CONTRACTOR INFORMATION: L:... NAME: �- �. .. ., •� NAME: MAILING AD SS: s MAILING ADDRESS: CITY: /fix°/lam» STATE:!-./iP CITY: STATE: ZIP: PHONE#1: 716, 7 PHONE: CELL: PHONE#2: EMAIL EMAIL: G' i C' L&I REG# EXY. I / C PRIMARY CONTACT: OWNER❑ CONTRACTOR❑ OTHER❑ NAME EMAIL r MAILINGADDRESS CITY STATE ZIP PHONE CELL 1 a PARCEL INFORMATION: PARCEL NUMBER(12 Digit Numb") ! �� - .() " U j(% ar TONING 'tJ LEGAL DESCRIPTION(Abbrevia FIRE DISTRICT• SITE ADDRESS yJ%1r`) n i I ti, 1 k'_- CITY t)L I I�.t.i_'1_ J DIRECTIQNS TQ SITE ADDRESS n [,lid r7r.'� f(tL1 (-{WO : /YI_ � t i)h Ir-4 , . Ld t2A, lly'1 _ 1L G OV t- IS THE PROJECT WITHIN 300 FT OF SLOPES)GREATER THAN 14k YES❑ NO❑ SNOW LOAD:psf IS PROPERTY WITHIN 200 FT OF THE FOLLOWING: (Chectan char apply): SALTWATER❑ LAKE❑ RIVER/CREEK❑ POND❑ WETLAND❑ SEASONAL RUNOFF❑ STREAM❑ TYPE OF WORK: NEW❑ ADDITION❑ ALTERATION❑ REPAIR❑ OTHER ❑ USE OF STRUCTURE(Becidmee,Garage,Commerdal Bldg;Etc) IS USE: PRIMARY❑ SEASONAL❑ NUMBER OF BEDROOMS NUMBER QF BATHROOMS HEATED STRUCTURE? YES(Whole Bldg)❑- YES(Part[.]of.8ldg)❑ NO❑ jj I f I/X yi DESCRIBE WORK ) SOUARF FOOTAGE:(prop..4 1 ST FLOOR sq.ft 2ND FLOOR sq.ft 3RD FLOOR sq.R BASEMENT sq.ft DECK sq.ft. COVERED DECK sq.ft STORAGE sq.ft OTHER sq.ft GARAGE sq.ft Attached❑ Detached❑ CARPORT sq.ft Attached❑ Detached❑ MANUFACTURED HOME INFORMATION: *4 COPIES OF THE FLOOR PLAN REQUIRED* MAKE MODEL YEAR LENGTH WIDTH BEDROOMS BATHS SERIAL NUMBER ENVIIiONAIENTAL HEALTH: - SEWAGE/SEWER SOURCE: SEPTIC❑ SEWER❑ / NEW❑ EXISTING❑ PLUMBINGIN STRUCTURE? YES❑ NO❑ Ifyes,attach completed Water Adequacy Form PERIMETER/FOUNDATION DRAINS PROPOSED? YES❑ NO[] EXISTING SQ.FT. EXISTING BEDROOMS PROPOSED BEDROOMS TOTAL BEDROOMS OWNER acknowledges that submission of inaccurate information may result in a stop work order or permit revocation.Adorowledgement of such is by signature below.I declare that I am the owner and I further declare that I am entitled to receive this permit and to do the work as proposed.I have obtained permission from all the necessary parties,including any easement holder or parties of interest regarding this project The owner or legal representative,represents that the information provided is accurate and grants employees of Mason County access to the above described property and structure(s)for review and inspection.This permittapplication becomes null&void If work or authorized construction is not commenced within 1 BO days or if construction work is suspended for a period of 1 BO days. PROOF OF CONTINUATION OF WORK ON THIS PERMIT IS BY MEANS OF INSPECTION. INACTMTY OF THIS PERMIT APPLICATION OF 180 DAYS OF MORE WILL CAUSE THE APPLICATION TO BE EXPIRED.(MASON ; COUNTY CODE 14.01i.42) Sign WNER(Must tils signed by the OWNE Date �EPARTMI NTAL_REVII .• .-=:. : DENIED_. :DATE=:==TAGS/NOTES/CONDITIONS=-ti: BUILDING DEPARTMENT r� PLANNING DEPARTMENT FIRE MAR ELAL PUBLIC HEALTH runt yd►U. I v feet. Side ard: 5 feet for accessor structures and 5 feet for the R-5 Zoning Belfair UGA dwe ling unit. Street side yard: 10 feet. Rear yard: 5 feet for accessory structures and 10 feet for the dwelling unit. - Street rear yard: 10 feet. 1 10/11/2022 Jsti `'`,�., 7jICf20L`�-0) ',� ~� <ca a w APPROVED Permit may be 3 MASON COUNTY DCD P ANNING c: required for walls �0 sem RUEay,Af �I;r check with BLD Dept. o e� ° 3 ►1 3 CL Digitally .,._....,Y!....._, ' `� l.. _. .__.._._,.._..__ m signed Scott Rudy by Scott Ruedy, 1...�' " , I.N,,.. _ 5' Minimum to property line 4 12 o 010 10' Min from ROW �Ilk 3 � ,. a v C :7 , n a ca c I�2b2 Planning Department Policy —RETAIRTING WALLS— This policy serves to clarify how retaining walls are treated in relation to the minimum distance that structures should be set back from property lines per the zoning restrictions in the Mason County Development Regulations and the minimum side setback requirements in the Shoreline Master Program's Residential Use Regulations. It is the policy of Mason County to allow the construction of engineered retaining walls 6 feet in _height or less and non-engineered retaining walls 2 feet in height or less to be located within the front,, side, and rear yard setbacks without needing a Development Regulations Variance, Administrative Variance,or Shoreline Variance(Building Permits,Mason Environmental Permits,and other permits and studies such as Geotechnical Reports may be required). For this exemption to apply,a`stepped' or `tiered' retaining wall shall not bear onto adjacent retaining)ATIls and be located at least as far apart as the adjacent wall is high. Bulkheads, at any height, for shoreline protection do not need to meet side yard setbacks. This policy does not allow retaining walls to be constructed within utility and access easements without written authorization from all parties with an interest in the easement. Platted easements must be eliminated via an Easement Removal, which undergoes Planning Department review. Heights are measured from grade(at the downslope side of the wall). irector of Community Development —�a* NOTESi 1. RETAINING WALL CALCULATED USING ACTIVE EARTH PRESSURES WITH VEHICLE SURCHARGES. 2, LEVEL BACKFILL OF AT LEAST 2 FEET - 3 INCHES FROM BACK OF WALL TO FRONT OF UPPER TEIR WALL IS REQUIRED, 3, ALL WORK SHALL COMPLY WITH APPROPRIATE IBC, STATE AND LOCAL CODES. 4, FILTER FABRIC SPECIFICALLY DESIGNED TO IMPEDE THE MIGRATION OF FINE SOILS INSTALLED ATOP THE DRAINROCK AND NATIVE S❑ILS, EXISTING 5. FOOTING SUBGRADES SHALL BE ON DENSE, EXI EXISE UNYIELDING, UNDISTURBED S❑IL, OR RE-COMPACTED GRANULAR FILL TO AT LEAST 95% OF MAXIMUM DENSITY PER ASTM D1557, 20' MIN. 6. DRAINAGE OUTLETS OR INFILTRATION FACILITIES ARE NOT PERMITTED WITHIN AT LEAST 20 FEET BEHIND THE RETAINING WALL, 7, L❑CATIONS SHALL BE VERIFIED BY THE OWNER/ CONTRACTOR TO MEET COUNTY SETBACKS, • a _ 00000 00000 0 0 0 4'-3' MIN a 00000 (TYP) .. :, ;:a • .. 0 000 ' •. p 0 2'X2'X4' MIN CONCRETE °°° ' '� 000 MODULAR BLOCK ' , ' . 00000 WITH • : 00000 INTERL❑CKING .• ° 00000 COMPONENTS ' `•. 000 • po 4L 4 4,5' MAX +. FILTER FABRIC ATOP DRAIN ROCK (TYP) •• .: : '•• 00°0° - 1 b' DRAIN ROCK 0 o EXTENDED AT LEAST •'• : 00000 18' ABOVE DRAIN PIPE, k 43045 .�, :• 00000 AND S' BEHIND PIPE �6� .�:. " 00000 0 0 0 • o PROJECT/ OWNER/ LOCATION WING❑ RETAINING WALL 4' DIA SOLID PVC 340 RIVER HILL ROAD UNDISTURBED, FIRM, PERFORATED PIPE BELFAIR, WASHINGTON UNYIELDING S❑IL OR S > 0,5%, GRAVITY DAYLIGHT COMPACTED FILL THAT ENGINEERi IS FIRM AND ENVIROTECH ENGINEERING UNYIELDIING. MODULAR BLOCK WALL PO BOX 984 BELFAIR, WASHINGTON 98528 NOT TO SCALE 360-275-9374 WALL DETAILS • v ceotechwica� � Ewv%rowwi.Cwtal, pra�wage � �.oadwa� May 18,2021 Cory Wingo 340 River Hill Road Belfair,Washington 98528 Reference: Block Retaining Wall Calculation Report 340 River Hill Road,Belfair, Mason County Washington To Whom It May Concern, Envirotech Engineering(Envirotech)has completed this retaining wall analysis and asbuilt for the already constructed block retaining wall system on the referenced property. The new block retaining wall has a maximum height of 4.25 feet above grade, and has 3 tiers. Our analysis included both the tiered system and the proximity of the existing residence. We conclude that the designed retaining wall is satisfactory.The factors of safety for stability exceed 1.5 for both sliding and overturning per the calculations below. Soil Properties unit weight of soil (pcf) 140 angle of internal friction (phi) 36 adhesion, ca (lb/ft^2) 0 Wall Properties Footing depth, D (in) 0 Total height of wall, H (ft) 4.25 block height(ft) 2 block depth (ft) 2 block length (ft) 4 weight of block(lb) 2320 coefficient of friction between concrete 0.6 PO gox924 ge�faCr, wash%v+.gtov98528 Off: 360-2,-59374 CCU,: 360-689-6045 evwlroteeh@geoteehvdwo E-fo-C-DVK Applied Loads on Wall dead loads on wall (lb/ft) 0 live loads on wall (lb/ft) 0 surcharges (psf) 200 distance from top of wall to surcharge (ft) 0 pore pressure (yes/no) no Soil Parameters active earth pressure coefficient, k 0.26 earthquake pressure coefficient, kh 0.19 angle of external friction, delta 24.00 deg Active Rankine Zone (ARZ) angle 63 deg 90-ARZ 27 deg Upper Lateral Pressures Block Block Block 1 2 3 Lateral pressure from soil 72.75 363.75 509.25 Lateral pressure from water 0.00 0.00 0.00 Lateral pressure from earthquakes 40.92 40.92 40.92 Lateral pressure from surcharges 103.93 207.86 311.78 Resultant earth pressure 218 613 862 Resultant horizontal earth pressure 199 560 788 Resultant vertical earth pressure 88 249 350 Resultant Pressure Location for Overturning 0.67 0.67 0.67 Sliding weight of block+ blocks on top, W 290 580 870 Resistance against sliding, Rsl 516 1,065 1,587 Factor of Safety, F.S. 2.6 1.9 2.0 Overturning Resistance against overturning, Rov 757 1835 3116 Overturning Forces 133 373 525 Factor of Safety, F.S. 5.7 4.9 5.9 Page 2of 4 Formulas and Definitions Fr= (7-Wi + RsV1 + RgV)tanb +cA + RsH2 + RsV2 Fs = RsH1 + RqH + Re + Rw F.S.static= Fr/ Fs F.S.dynamic = Fr/ (Fs + Re) Mr= SWixi + RsH2y2 + RSV2xsV2 + RsV1 + RgVxsV! Mo= RsHiy1 + Rwy1 + RgHyq F.S.static = Mr/Mo F.S.dynamic = Mr/ (Mo + Reye) y = soil unit weight (P = angle of internal friction ca= adhesion Pore Pressure: pressures due to water Earth Pressure: active, passive, or at rest R = angle of backfill yw = water unit weight B = footing width H = height of wall D = foodting depth K= earth pressure coefficient Ke= earthquake pressure coefficient b = angle of internal friction Rsi = soil partical resultant force RsHi = horizontal resultant force RsV1 = vertical resultant force Rw = pore water resultant force Rq = surcharge resultant force RqH = horizontal surcharge component RqV = vertical surcharge component Re = earthquake resultand force opposite soil partical relultant Rs2 = force RsH2 = horizontal component RsV2 = vertical component Mr= resistance against overturning Mo= overturning forces Fr= resistance against sliding Fs = sliding forces F.S. = Factor of Safety Page 3of 4 Envirotech appreciates the opportunity to be of assistance on this project.We anticipate that this retaining wall analysis/conclusions will meet your expectations. Please contact Michael Staten at 360-275-9374 if you have any questions or require additional information. Sincerely, Envirotech En 'neering CLY'DA�ST 1 ; 1 5/18/23 Michael Staten,P.E. Project Director Page 4of 4