4704 HARBOR LN 2018-01-02 MF Import

".-000 NZ A �- Main Office 17311 — 135' Avenue NE, A-50o Woodinville, WA 98072 (425) 486-1669 FAX (425) 481-2510 (425) 337.1669 Snohomish County DATE: October 28, 2009 NELSON GEOTECHNICAL ASSOCIATES, INC. GEOTECHNICAL ENGINEERS & GEOLOGISTS Enginoodng-Geology Branch 437 East Penny Road Wenatchee, WA 98801 (500) 665-7696 FAX (509) 665-7692 MEMORANDUM TO: I lolly and Rick Anderson CC: John Dippold — Carney Badley Spellman Eileen Mattes — Perko Insurance Company FROM: Khala.i M. Shawish, PE RE: Anderson Slide Shoring Plan Coniments Everett, Washington NGA File No, 816909 i6%�sjvy This memorandum presents our responses to the concerns raised by Frank Pita, PE of Jacobs Associates, Inc. In his letter dateA October 18, 2009 to Chris &'Todd Chase regarding geotechnical and structural plans for stabilizing a slide that occurred on the Anderson property located at 4704 harbor Lane in Everett, WA. The letter references the wall design prepared by CG Engineering, however; the letter does not specifically reference our gcotechnical engineering report which was the basis for the shoring wall design. Mr. Pita did not specifically state that he reviewed the geotcchrtical report. Most of Mr. Pita's comments mist minor issues related to code referencing and typographical errors that do not represent a fundamental disagreement with the provided design. The main exceptions would be the statement made by Mr. Pita that the wall will only stabilize the upper few feet of the slope, and leave the remainder of the slope prone to future slides. Ile also had concerts with, site drainage. In regard to the ability of the wall to stabilize the slope, extensive stability analyses were perfonned and included in the gcotechnical report. Our analyses clearly showed that the wall will indeed stabilize the slope and prevent future slides (if our recommendations arc followed). This slope has a history of landsliding activity. We found that the source of the sliding activity on the slope was the saturation of TV Cry 146s �1,/,ed �s m6,mo a ad i*e ire aw vs F/I7W i/O SUhSf+cnJr(/2 I--eGSah !ar glfo�i, 41C. -fog- it✓aarocc:•. .YB //-4-D�