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Home My WebLink AboutSlope Stabilization Study - PLN General MEMORANDUM TO: Mr. James Clements 12912 SE 185th St. Renton, WA 98058 CC: Associated Earth Sciences ATTN: George H. Bennett 911-5th Avenue, Suite 100 Kirkland, WA 98033 FAX: (206) 827-5424 FROM: Terry Ryan Mason County Building Department P.O. Box 186, Shelton, WA 98584 (360) 427-9670 ext. 359 FAX: (360) 427-7798 DATE: January 30, 1998 RE: Slope Stabilization Study Parcel #: 322075090904, NE 21101 North Shore Road, Tahuya, WA 98592 A framing inspection was recently scheduled for the site identified above. During the inspection, performed on January 28, 1998, 1 noticed that a slide has occurred recently at the site. The home is now 8 feet from the top of the slope because of the slide. After reviewing the two letters in our files from Associated Earth Sciences, with the latter letter acknowledging 18 feet from the top of the slope, our department has come to the conclusion that a slope stabilization study will be required before the project can continue. On January 29, 1998 1 returned to the site and posted the house with a stop work order. If you have questions regarding the stop work or our decision to require a slope stabilization study, please call me at (360) 427-9670 ext 357. The best time to reach me at the office is Monday through Friday between 8 a.m. until 9 a.m. and 3 p.m. until 4:00 p.m. Mar- 16-98 11 : 24 AESI Kirkland 4258275424 . A a 3 1 P'.01 ` -FIELD REPORT,_, .,--,-., ,,,, �k ASSOCIATED EARTH SCIENCES, INC. 91 1 Fifth Avenue, Suite 100 179 Madrone Lane North Date Proicri NiitpR k= 3 Kirkland, Washington 98033 Bainbridge Island, WA 98110 3/12/98 Clements Pro fi lth 425-827-7701 FAX 827-5424 206-780-9370 FAX 780-9438 Location Weather North Shore Road,Tahu a,WA og 50's TO: James Clements Municipality r?M40I.X; Bldg Permit No. 12912 SE 185th ST. Mason Count z,> Sor)d`"U N/A Engineer/Architect Renton Washington 98058 N/A ATTN: Jim Clements cllry,trowner Jim Clements AS REQUESTED BY: Jim Clements G�mtvidConlrar.InaSuperintendent N/A Eanhwork Contractor THE FOLLOWING WAS NOTED; N/A _ We arrived on site at the request of our client to observe and evaluate existing surface conditions related to recent landslide activity at the above-mentioned site. At the time of our arrival, We noted that significant re-grading of the property had occurred since our last field visit in July of 1996, The upper portion of the property consisted of a cut area to the east and a fill area to the west. Fill soils in the area had been placed against makeshift log cribbing placed prior to filling. Fill soils in the area appeared to loosely placed up-slope of the cribbing. Significant erosion of the loose fill through the logs was evident at the time of our visit. Based on the loose nature of the soils and the inadequate retaining capability of the log cribbing, we recommended to Mr. Clements that the western fill portion of the parking area not be use for parking or the support of structures. Based on the loose nature of the uncompacted fill soil in the area as reported by Mr. Clements, it is our opinion that the fill in this area is at high risk for continued erosion and possible landslide activity. The lower portion of the property was occupied by the exisiting, under-construction house to the south, and a narrow, graded bench north of the house. The landslide north of the house appears to have occurred within fill soils placed in a similar configuration to the upper parking area. Mr. Clements indicated to us that uncompacted fill was placed behind makeshift log cribbing by the earthwork contractor. These soils appeared to have become saturated from heavy rains and inadequately controlled surface water from the downspouts of the house, and slid toward the beach area exposing the dense, native glacial sediments. The landslide appears to have occurred entirely within the 6 to 8 feet(horizontally) of loose fill soils placed in the area during grading. The southern flank of the landslide approaches to within 8 to 10 feet of the northwest corner of the house. However, It appears that the house footings bear directly on the dense native sediments exposed in the area which at the time of our visit appear to be uneffected by the current lansdslide. The landslide does not appear to be effecting the bearing capacity of the native soils and in our opinion, the house is not currently in danger of being undermined. In our opinion, based on surface conditions, the native soils in the area of the house are at a relatively low risk of landsliding in their current slope configuration of a 1 H:1 V slope extending the entire length of the slope to the beach. However based on the proximity of the slide area to the house, we recommend that the area be closely monitored for signs of future slope instability specifically within the current 10 foot setback area between the house foundation and the top of the existing slope, We observed that Mr_ Clements had tightlined all the downspout drains the entire height of the hill and appears to have adequately controlled surface water in the area. In addition, efforts to revegetate the area of the slide were in progress, We recommended that the slide area be closely monitored for signs of future instability. If signs of instability are observed, we recommended that we be contacted immediately to review the current conditions, COPIES TO- ,� �+' -r, hit 9%. FIELD kt-P ' ' � - � 'l"C Li L)AtE MAILED: 3 - , �j 'Q �L SIGNED: GARY YANDO,.DIRECTOR STAr�o k. Mp y o A U y DEPARTMENT,OF COMMUNITY DEVELOPMENT h o PLANNING-SOLID WASTE-UTILIMS BLDG.III • 426 W.CEDAR • P.O. BOX 578 J 1864;;,' SHELTON,WA 98584 • (206)427-9670 May 11, 1993 Jaimek and.Anna Clements 12912 SE 185th Street Renton, WA 98058 RE: Substantial Development Permit. Bulkhead construction. PN 322075090009 PN 322075090904 (� � F,L Dear Mr. Clements: As of May 11, 1993 the Department of Community Development has not received detailed plans. 'for the proposed bulkhead construction, which'were requested earlier. These plans are necessary� ' for the, review process and the SDP cannot be started without them: In an earlier phone conversation with you we had discussed the submission of house plans as well. The department . had;informed you of its policy in regard ,to submission of a bulkhead and residence permit:� application simultaneously and that in these instances the department may not require a shoreline�: permit for the bulkhead. You had stated that you wished to pursue this route. Also understand that after a residence is constructed at the site any bulkhead which protects the house from. E shoreline erosion is exempted from the shoreline permit process. If the department does not receive detailed site and structural plans for the bulkhead within (15) fifteen days from the date of this letter your check will be returned and your shoreline permit will become inactive. ' E If you have questions regarding the information provided please contact this office at 427-9670. ext. 295. R7anassee, y, J. Planner t Department of Community Development z f t E Recycled. 0 - 'iD '7C GARY YANDO,DIRECTOR STgTFO o A°u 0 DEPARTMENT OF COMMUNITY DEVELOPMENT ►}- o T i PLANNING - SOLID WASTE - UTILITIES N Y 4 BLDG. I • 411 N. 5TH ST. • P.O. BOX 578 1864 SHELTON,WA 98584 • (360) 427-9670 July 2 , 1998 Doris Small, Habitat Specialist 502 High St . Ste 108 Port Orchard, WA. 98366 RE: James Clements new plans for logs on Hood Canal beach Dear Ms . Small : James Clements has faxed me a new version of his plan to use logs and root wads that have come down onto the beach in last winter landslide. His new side view shows that the logs will come from the beach area and be placed at the toe of the new bankline on his property. He may take some of the soil from above the beach and place it higher above the beach to provide more weight at the toe of the steeper slope face (make it more stable) . With the relocating of logs and root wads, and no soil material removal from the beach area, the project would be minor work done and would be exempt from the SEPA review process. If soil is moved on the slope, it will be above the beach, as discussed with Mr. Clements . The project is not valued at $2500 value and would not need a shoreline permit. Acerely, n Bor en Shoreline Planner cc: J. 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