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NELSON GEOTECHNICAL <br />A AssociATFs, <br />GEOTECHNICAL ENGINEERS & GwLoGisTs <br />Main Office <br />17311 --135111 Ave NE, A-500 <br />Woodinville,WA 98072 <br />(425) 486-1(A9 - FAX (425) 481-2510 <br />December 2, 2014 <br />Mr. Bruce McKinnon <br />1617 Edgemoor Lane <br />Everett, WA 98203 <br />Geotechnical Engineering Evaluation <br />McKinnon Residence Retaining Wall <br />1617 Edgemoor Lane <br />Everett, Washington <br />NGA File No. 910614 <br />Dear Mr. McKinnon, <br />Enginecring-Geology Branch <br />5526 fadusay Cane, 02 <br />East Wenatchee, WA 98M <br />(509) 065-7696 . FAX (509) 665-76922 <br />This letter summarizes the results of our geotechnical engineering evaluation and stabilization <br />recommendations for the existing timber retaining wall and top of slope area located below your <br />residence at 1617 Edgemoor Lane in Evertt, Washington, as shown on the Vicinity Map in Figure 1. Our <br />services were completed in general accordance with our proposal signed by you on October 14, 2014. <br />INTRODUCTION <br />The purpose of this study is to explore and characterize the surface and subsurface conditions within the <br />vicinity of the existing timber retaining wall and the top of the steep slope, in order to provide our <br />opinions with respect to the existing stability within this area and provide recommendations for <br />improving the stability conditions of the this area. We were informed that some indications of settlement <br />have been observed within the top of slope area throughout the years, and we understand that you wish to <br />replace the existing wall along the. top of slope with an engineered retaining wall, likely consisting of <br />driven cantilevered pin piles to improve the stability conditions within the vicinity of the yard area. You <br />have requested our opinions and recommendations for design and installation of the wall. We also <br />understand that you wish to place a garden shed near the top of the slope as well. <br />