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HomeMy WebLinkAboutGEO Landslide Eval 2 parcels - GEO General - 2/6/2018 \ 1015 East 4th Avenue INSIGHT GEOLOGIC, INC. o� Waah� Olympia;Washington 98506 Telephone: (360) 754-2128 vj 7 Fax: (360)*754-9299 MEMORANDUM TO: Genie McFarland, Mason County <�� 81 g FROM: William Halbert, L.E.G. 7S DATE: February 6, 2018 i3lA iam E. Halbert PROJECT: Close Property, 8262 SR 106, Union, WA SUBJECT: Landslide Evaluation This will constitute our preliminary report regarding the recent soil failure at the Robert Close property located at 8262 SR 106 in Union, Washington. The property is located at the base of a hillside overlooking Hood Canal. We understand that sometime in the past 24 hours the property was subjected to soil movement from the hillside to the south. That soil movement resulted in mud and debris being deposited against a structure on the property. We evaluated the site today to assess the soil failure and evaluate the potential for future failures which could endanger life or property. We understand that the location of the failure is in a steep, shallow drainage that has a perennial stream flowing through it. Historically, the water from the stream was captured at the base of the slope and routed to a small pond which then overflowed to a pipe and routed to a catch basin along the shoulder of the highway. The stream appears to emanate from a spring higher on the hillside. As a result of the soil movement, a large apron of mud and debris was deposited at the base of the slope covering the water catchment system and flowing up against an outbuilding. During our reconnaissance, we climbed the hillside to assess the originating point of the soil failure. It appears that, as a result of heavy rains over the past weekend, soils within the drainage became saturated and flow increased within the stream as well as the springs feeding the stream, resulting in the loss of strength within a relatively thin soil layer covering dense, glacially consolidated material. It was this soil layer which became fluidized and flowed downhill as a debris flow; a mixture of mud and water. It appears that most of the available loose soil in the drainage immediately adjacent to the stream was mobilized in this event. However, there remains loose soil and debris within the drainage that could, under certain heavy precipitation conditions, fluidize and flow downhill following the same path. These subsequent flows, should they occur, will likely be much smaller than the one which occurred within the last day and should not present a risk to life safety for persons residing Mason County February 6, 2018 Page 2 in the structures on the property. However, some structural damage could occur, and we recommend installing a catchment/diversion system to route future flows away from structures on the property. A system consisting of buttressed concrete ecology blocks should be sufficient to contain and route future debris flows from the drainage away from the affected house and onto the asphalt driveway apron. Accumulated mud and debris can then be removed from behind the wall. f t ti qy f Is Case Number: IF ! Ovd Mason County Investigation Report Form -O.-'7 d Parcel Number: .S 213`/ -L13 _ Violation Site Address:961-f /� T Property Owner(s)�ab_ T' l�I l E Phone#: Mailing Address:'?D-box 51 t Union WA -9 6 69-A Tenant/Contractor/Operator on site: Directions to Site: AOA D9�11U r,& f' U►'Yl Ake, Description of Concern: 1 JQ bo-hod— o 2 - Under the provisions of the Public Disclosure Law, RCW 42.56.240, the complainant may indicate a desire for disclosure or non-disclosure of their identity. If non-disclosure is chosen, this portion of this form will not be released to the public unless this case is filed in court. If filed,your name will be disclosed if you are a witness in the case. Mason County investigates possible violations on a complaint basis only. Therefore,the name of the person filing the complaint should be provided. Please check one of the following: ❑ Please do not disclose my identity. I understand that disclosure may be required by court order or if this matter goes to court. ❑ You may disclose my identity. Name (please print): O vJ "'j Phone: Address: Street City State Zip Signature of Complainant: Date: THLS SECTION FOR MASON COUNTY USE ONLY Complaint Received by: Date: Complaint Received by: ❑ Phone ❑ Email ❑ Web Site ❑ In Person Department of Concern: ❑ Building ❑ Planning- ❑ Fire ❑ Public Works Environmental Health: ❑ Solid ❑ On-site ❑ Wells ❑ Food ❑ Ot-h�eer Investigation Date and s�Findings: L i9N 4.5 z-/� F /�fib l C K n f -N'us f' l/��e- �'�t/� /Vo �rK yC j L)le 4 1- 67`1 M iV 6 F !� /7aUS$ yFT- Fo -TECH �,c./lc 0'C /VFI-,8n Date Closed: Reason Closed: Initials: PSON cooyr� MASON COUNTY (360)427-9670 Shelton ext.352 DEPARTMENT OF COMMUNITY DEVELOPMENT (360)275-4467 Belfair ext. 352 BUILDING•PLANNING•FIRE MARSHAL (360)482-5269 Elma ext. 352 Inspection Hotline (360)427-7262 y Mason County Bldg. 8, 615 West Alder Street 1854 Shelton, WA 98584 www.co.mason.wa.us CORRECTION/INSPECTION REPORT PERMIT/CASE NUMBER: ,L ADDRESS/LOCATION: Z 6`T D FINDINGS: 7y l S qac):56 SoM c,C 01 L i5 o CC v rI rA o -P E T Y e- 2r-5,E cz it ff4'-Ap To .Es-L✓E �t-t- �ssyf,5 , U ecvpfiNCy NL-y -fTir-2 oc'N ry Items listed above must be corrected to lain compliance. 19 THIS IS NOT A COMPLETE INSPECTION ❑ This structure has been inspected by Mason County Building Department and the items listed above are in VIOLATION of Mason County laws and/or ordinances. ❑ Call for re-inspection when corrections are made before proceeding with any further work. ❑ Make corrections, items will be checked on the next inspection. ❑ OK to ��)) Date: 6 Z��� Zo b ❑ Please contact our office regarding possible Department: L structural damage incurred by recent Inspector: u/t f ,natural/man made"disasters.This is NOT a CORRECTION NOTICE. 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Alder Street I wi h to sumbit a complaint about unauthorized work that was performed at Parcel NO. 2 -41-Qt 90 and/or ,U2,34-43-00142. d County Records indicate a land slide occurred in 2018. An enforcement action was issued. The owner of the site and a local construction contactor, Arrow Excavating, constructed an unauthorized retention system that has drastically altered the flow of water in this highly sensitive geological area. I believe the contractor, Arrow Excavating, knowingly performed work outside of his ability which has negativrely impacted our property as well as our tidelands. Thank you for pursuing this matter in an expedited manner. Page 1 '''--~-- ' ~~ ~`~' '^y WA^ ~-'~~ Web '~'~~r 8311 ESTATE ROUTE 10E 2234430010( 322344300101 STATE ROUTE 106 8310ESTATE ROUTE WE 322344300110 00 February 8. 2O18 11.128 o 0.0075 0.015 oourm 7—� County Boundary -- City o uom uoo uon km 9 Site Address (Zoom mm1:o.000) - pxvava F-1 Tax Parcels(Zoom mm1:uo.000) -- Green Diamond nvoms --- uo Forest Service Sources Es/ *snc o"Lo /*- ."�"�wp:� osaoo -- Federal �� / _+ na ,v000 (Zoom to os� Ao� o� �� � a". �p= wcn, ssri Cmna (Hongx"ng),swsswpo,ww~*rd,m -- State -- Contours zo«(amwn) me"m~mm"pcom,/bu^"",and m"om User o"ny~uni* -- County Mason County wwom Web Map Application Bureau m Land w"=gam"nt,s"",HERE,m°m.n,vson,weA,EPA,USDA,wpo/ Mason County WA GIS Web Map N 8261 ESTATE ROUTE 10 N 8243 E STATE R TE 106 8241 ESTATE ROUTE 106 8291 E STATE ROU 106 311 E S ATE RO TE 106 • 8301 E STATE UlE 06 8333 STATE R LITE 106 8331 E STATE ROUTE 1 6 UNIT A 8361 E SfTATE•ROIITE 106 UNIT 8260 E STATE ROU-TEJ 06 8341-€S7T�570 OUTE yl NT B. 8242 E STATE ROUTE 106• I 8341 E STATE ROUTE'td6UN f • I • r 8262 E STATE ROUTE 106 8361 E STATE ROU06,�J 11T'At • 8240 E STATE ROUTE 106 • 83,71.E STATE ROUTE 06 8264 E STATE ROUTE 106 • 8330E STATE ROUTE 106UNT 8310 E STATE ROUTE 10S• •8 41 E STATE ROUTE 106 • 8370 E STATER E 106 O 8410 E STATE ROUTE 106 lV �1 M 10/14/2019 9:51:26 AM 1:1,532 _ 0 0.01 0.03 0.05 mi County Boundary 0 0.02 0.04 0.08 km Site Address (Zoom in to 1:5,000) Tax Parcels (Zoom in to 1:30,000) Sources:Esri,HERE,Gannin,Intermap,increment P Corp.,GEBCO,USGS, FAO, NPS, NRCAN, GeoBase, IGN, Kadaster NL, Ordnance Survey, Esri Japan,METI,Esri China(Hong Kong),(c)OpenStrsetMap contributors,and 4-OPW6 P. the GIS User Community Ll Mason County WA GIS Web Map Application Esri Canada,Esri,HERE,Gannin,USGS,NGA,EPA,USDA,NPS I