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'�`*�:.va\t4�� s�`+t`.��..tQ''`L�.Z>"F.,.'��.IR �+� SITE INSPECTION BROOKS PROPERTY CONTACT INFORMATION 1'��%0l tees � PREPARER INFORMATION \a AAG PROJECT NUMBER: AAG18-008 CONTACT: CURTIS D.CUSHMAN ADDRESS: 8947 BUTTONWOOD LANE NE OLYMPIA,WASHINGTON 98516 TELEPHONE: (360)491-5155 CELL: (360) 481-6677 EMAIL ADDRESS: CURTIS.CUSHMAN@COMCAST.NET CLIENT INFORMATION CLIENT: Roy BROOKS TELEPHONE: EMAIL: ROYTBROOKS@GMAIL.COM BILLING ADDRESS: Roy BROOKS P.O.Box 1292 ENUMCLAW,WA 98022 CONTACT: BETH RIEBLI JOHN L.SCOTT REAL ESTATE P.O.Box 3240 23910 NE STATE ROUTE 3 BELFAIR,WA 98528 (360)275-1600 (360)621-2445 MOBILE SITE ADDRESS: FGRAPEV�' IEW,WA983524 T TREASURE LANE -,S3 — Cc (00� woe btio�2� PARCELS: ND-04005 GPS LOCATION: N47, 19' 00.53" W122°50' 34.60" SITE INSPECTION Roy BROOKS P.O.Box 1292 ENUMCLAW,WA 98022 RE: SITE INSPECTION PROJECT: SLOPE AT BROOKS RESIDENCE 130 EAST TREASURE LANE GRAPEVIEW,WA 98524 PARCEL#S: 12180-53-04004&-04005 FEBRUARY 1,2018 Dear Mr. Brooks: As per the request of Iketh Riebli (contact) on the behalf of Mr. Roy Brooks (client), Curtis D Cushman L.E.G., L.G., and Blaise Jelinek E.I.T. of All American Geotechnical, Inc. (AAG) visited the above property on January 31, 2018 for an evaluation of the stability of the slope to the east below the Brooks residence. On site was AAG and the contact. This letter is being prepared on February 1,2018. The particular observations on this date were to look at landslide potential on the slope, evaluate the nature of several weeping springs, and determine the safety of the current residence and its nearby stand- alone garage. The results of this site inspection must be considered as preliminary and are not a full geotechnical report for this site. AAG reserves the right to alter any conclusions in this inspection letter reflecting changes on-site and/or through further geotechnical work. ScarpFailure t _ t -t t. > t�e q < .fir� � ti•. ,� i � ,�,� P �,J �.� d a�: � ,�? rya fr OBSERVATIONS The site consists of two parcels with a main residence on one and the stand-alone garage on the other. Both are above a slope that descends toward the east and Case Inlet near the south tip of Stretch Island. The crest of this slope represents the top of a Landslide Hazard Area (LHA) as defined by Mason County. At the time of the site visit,the following observations were made. AAG 18-008 8947 Buttonwood Lane NE, Olympia, WA 98516 2 Phone#: (360)491-5155 Cell#: (360)481-6677 ALL AMERIC AN GEOTECHNIC AL 1. A deep-seated landslide has developed to the immediate north of the client property. Limited in width, it shows a step-down series of failure scarps down to the east. These scarps are very fresh and according to the contact, Beth Riebli, they had grown in a matter of days. The total amount of drop is several feet and this slide is to be considered currently active and very hazardous. 2. On the slope below the residence and the garage, there are a number of weeping springs creating bog-like conditions locally. Many of these are at the foot of an old scarp that is the first steep drop to the east of the structures and whose top represents the upper limit of the LHA. These boggy conditions exist in scattered areas of the hummocky plateau below the toe of this scarp. 3. In certain areas of the plateau, some separation cracking is seen. Trees, including mature ones near the base of the old scarp and immediately below the structures, are for the most part straight and vertical. 4. Examination of satellite photos indicate ongoing shore-line erosion, creating instability at the furthest eastern side of the property along the bluff above the Sound, 5. The residence appears to be on a stable geologic platform. No indication of settlement or cracking was seen. The contact indicated a sump pump was employed in the residence and a substantial curtain-type drain was seen south of the garage and is likely part of a drainage system that appears to have another drain under the gravel driveway/parking area west of the residence. GEOLOGY This is taken from the Geologic Map of Vaughn 7.5 minute-Quadrangle, Pierce and Mason Counties, Washington; by R. L. Logan and T. J. Walsh; 2007; Washington Department of Geology and Earth Resources Geologic Map GM-65. Qls Landslide deposits—Generally loose, jumbled, tan to gray, silty sandy gravel with few to no discernible sedimentary structures; surfaces of landslides are generally undulatory; some landslides in the quadrangle occur as large deep-seated slides and others as shallow surface failures or block falls. This is the unit below the old fault scarp to the east of the structures. However, it is apparent that the structures themselves are built on the following: Q9t Vashon till—Unstratified to moderately stratified, compact, unsorted mixture of clay, silt, sand, and gravel deposited directly by glacial ice; gray to tan; nearly everywhere in sharp contact with underlying units; does not drain well as permeability and porosity are low; sand and finer grains in matrix are very angular... AAG 18-008 8947 Buttonwood Lane NE,Olympia,WA 98516 3 Phone#: (360)491-5155 Cell#:(360)481-6677 ALL AmEkicAN GEoTEcHmicAL This appears to be that material on-site. This is a suitable building site material and is stable unless undercut and/or saturated with water. The material should be ASTM classified as (SP) a Poorly graded gravelly sand. LiDAR a The LiDAR image from the Puget Sound Lidar Consortium Q4712201be.tif shows the structures to be , on the edge of the landslide area that extends to the - Y north and south. The number of arcuate shapes and the hummocky terrain indicates the landslide is relatively r: M recent and has not gone to completion locally. CONCERNS The concern is the stability of the platform where the structures are located. There is concern about the consequences of land failure on the property. 1 { There is likely that the current land failure to the north will continue. The next consideration is whether this 'f will spread to the client property. This is a real hazard J as is the possibility that the slope below the residence and garage can fail, especially where the springs are seeping through to the surface. CONCLUSIONS AND RECOMMENDATION • The landslide failure occurring to the north is a threat to the client property but appears currently to be limited in scope. It will likely continue to collapse but will probably not undermine the client property in the short term. This should be monitored and when the failure is reasonably stable,the scarps should be revegetated or engineered for stability as the need arises. • There is a possibility the terrain below the client residence and garage will collapse on its own in part or in a block, although the latter is very unlikely. Remediation of this would rely on the scope of the failure. There is very little that can be done to prevent a failure, but de-watering is a technical possibility albeit an expensive one. • The location of the residence and garage are on stable Qgt deposits. In the event of failure of the slope below the old scarp where the weeping springs are present, there would most likely not damage the structures. • It is possible to refine the knowledge of the site through additional geotechnical methods such as drilling for information at depth, surface sampling and mapping, and mathematical profiling of the slopes for slope stability studies. Any further work would require the contours of the site be shot in by a licensed surveyor. AAG 18-008 8947 Buttonwood Lane NE,Olympia, WA 98516 4 Phone#: (360)491-5155 Cell#: (360) 481-6677 � 4 • It is not needed at this time to remove any trees. Hazard trees may be removed as required, but in general the roots should be left in place. CLOSING We have prepared this letter for the exclusive use of Roy Brooks and his authorized agents for the site in Grapeview, Washington. Within the limitations of scope, schedule and budget, our services have been executed in accordance with generally accepted practices in the field of engineering geology in this area at the time this report was prepared. No warranty or other conditions, expressed or implied, should be understood. We appreciate this opportunity to be of service to you and we look forward to working with you in the future. If you have any questions concerning the above items, the procedures used, or if we can be of any further assistance please call us at the phone numbers listed below. Clients and property owners must understand that, while a slope may be found to have an acceptable Factor of Safety related to deep-seated mass wasting, surficial failure and landslides can and do occur on steep slopes. The property owners should monitor the stability of their property. Moreover, a relatively stable areas does not guarantee there cannot be earth-movement failures. It is the responsibility of the property owners to understand that there are always risks in residing on or near steeply sloped areas. Respectfully Submitted, hj7 ALL AMERICAN GEOTECHNICAL,INC. ' f 2--L J ,� 2439 Curtis D. Cushman, L.G., L.E.G. Senior Engineering Geologist C Dean CUSWW :: AAG 18-008 8947 Buttonwood Lane NE,Olympia,WA 98516 5 Phone#: (360)491-5155 Cell#: (360)481-6677 COUNTY Community Development MASON COUN j j Code Enforcement W.Alder Street-Shelton,- - COMMUNITY SERVICES 6�Shelton:360-427-9670,Ext.3528584 Belfair:360-275-4467,Ext.352 Building,Planning,Environmental Health,Community Health Elma:360-482-5269,Ext.352 To: Richard &Allyn Berg 12(o$-53 170 E.Treasure Ln.Grapeview,WA.98546 Roy&Linda Brooks o20 130 E.Treasure Ln.Grapeview,WA.98546 4441 CtC ��o� Dear, Sir or Madam, This letter is to advise you that slide activity has been observed at the above residences. Mason County is requiring the owners of these properties to consult with a Geologist, list Included. Please contact Mason County with a timeline and results of findings. If you have any questions please contact, Curt Ek 360-427-9670 ext.357 Mason County Code Enforcement Officer/Building Inspector (0vNT� V-)lcc T�4f'�ii` 1vG rr- 0"1 Case Number: t/V ............ —------ Mason County Investigation Report Form Parcel Number: 12-1&"4- 0 0 L1 Violation Site Address: 130,E- 7,et04sU,,ZC Property Owner(s): 0�'/' f ell Av'b/Ile/?coo K s Phone 4: Mailing Address: fh , 4"'x /Z5 z Z�alo '44ny� W'q ?,g 00.-_ Tenaat/Contractor/Operator on site: Directions to Site: Al/a 4--f H /'/W.y-'S 1-0 G11 a c,;-Vt A-fil A 42 Description of Concern: 11"/f 6-16 Under the provisions of the Public Disclosure Law, RCW42.56240, the complainant may indicate a desire for disclosure or non-disclosure of their identity. If non-disclosure is chosen, the bottom portion Of this form will not be released to the public unless this case is filed in court. Iffiled,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 Lines: Please do not disclose my identity. I understand that disclosure may be required by court order or if this matter goes to court. LJ You may disclose my identity. Name(please print): Phone: Address: Street City State Zip Signature of Complainant: Date: THIS SECTION FOR MASON COUNTY USE ONLY, Complaint Received by(if applicable): 7 Complaint Received by: Phone Email Web Site In Person Department of Concern: Building_ Planning Fire Public Works Environinental Health: Solid On-site Investigation Date and Findings: 6�, C f. 5 Date Closed: 4 7 Reason Closed: jN L)X-,/-i Initials:Z -W -?�-* ......................... ............. ........... ...... TerraScan TaxSifter- Mason County Washington Page 1 of 2 MASON COUNTY WASHINGTON TAXSIFTER SIMPLE SEARCH SALES SEARCH REETSIFTER COUNTY HOME PAGE CONTACT DISCLAIMER PAYMENT CART(Q) Melody Peterson Mason County Assessor 411 N 5TH ST Shelton,WA 98584 Assessor Treasurer Appraisal MapSifter Parcel Parcel#: 12108-53-04004 Owner Name: BROOKS, ROY T&LINDA H DOR Code: 18- Residential-All other Addressi: PO BOX 1292 Situs: 130 E TREASURE LN Address2: Map Number: City,State: ENUMCLAW WA Status: Zip: 98022 Description: PIRATE'S COVE#2 BLK: 4 LOT: 4 Comment: 2018 Market Value 2018 Taxable Value 2018 Assessment Data Land: $189,695 Land: $189,695 District: 0080-Tax District 0080' Improvements: $313,620 'Improvements: $313,620 'Current Use/DFL: No Permanent Crop: $0 'Permanent Crop: $0 Total $503,315 'Total $503,315 Total Acres: 0.70000 Ownership Owner's Name Ownership% BROOKS,ROY T&LINDA H 100% Sales History Sale Sales # Excise# Grantor Grantee Price Date Document Parcels 10/31/13 i2016964 2 13-18329' ABERNATHY,KENNETH D& BROOKS, ROY T&LINDA H $440,000 JOYCE L 08/01/90 p 512919 1: 199008014 ROBERT CAL HOPPER ET UX KENNETH D ABERNATHY ET UX $59,500 (JOYCE L) 08/01/90 604337 1 199008014 ROBERT C/RUBY L HOPPER KENNETH D/JOYCE L ABERNATHY $59,500' 08/01/90 512919 1 199008014 ROBERT CAL HOPPER ET UX KENNETH D ABERNATHY ET UX $0 A (JOYCE L) 08/01/90 ;604337 1 1199008014 ROBERT C/RUBY L HOPPER KENNETH D/JOYCE L ABERNATHY $0 Historical Valuation Info Year Billed Owner--� Land Impr. PermCrop Value Total Exempt Taxable 2018 BROOKS, ROY T&LINDA H $189,695 $313,620 $0 $503,315 $0 $503,315 2017 BROOKS, ROY T&LINDA H $180,665' $304,875' $0 $485,540 $0 $485,540 2016 BROOKS,ROY T&LINDA H $110,700' $208,120 $0 $318,820 $0, $318,820: 2015 BROOKS,ROY T&LINDA H $99,000 $198,825 $0 $297,825 $0 $297,825' 2014 BROOKS, ROY T&LINDA H $85,500' $188,075 $0 $273,575 $0 $273,575 View Taxes http://property.co.mason.wa.us/Taxsifter/Assessor.aspx?key1d=33 81126&parcelNumber=l... 1/17/2018 TerraScan TaxSifter-Mason County Washington Page 2 of 2 Parcel Comments No Comments Available Property Images No images found. 1.0.6103.28469 Data current as of:1/16/2018 4:22 PM TX_RollYear_Search:2018 http://property.co.mason.wa.us/Taxsifter/Assessor.aspx?keyId=33 81126&parcelNumber=l... 1/17/2018