11611 AIRPORT RD Geotech Report 2018-01-02 MF Import

� � Geotechnical Gngineering Report Proposed AFui Warchouse May I l. 2001 CG File No. 1 l2l Page 2 SCOPE: The purpose of this study is to explore and characterize the subsurface conditions and present recommendations for site development. Specifically, our scope of services as outlined in our Proposal for Geotechnical Services,dated April 19, 2001, includes the following: l. Review the geologic map for the site area. 2. Cumplete backhoe-excavated test pits to determine the subsurface soil and grc md water conditions. 3. Provide �ecommendations for site preparation, grading, and placement of structural :ill. 4. Provide recommendations for temporary and permanent cut slope stability. 5. Provide recommendations for shallow foundation support including lateral pressures. 6. Provide soil parameters for use in rockery and concrete retaining wall design. 7. Piovide recommendations for pavement support and design. 8. Document our findings and recommendations in a written report. SITE CONDITIONS Surface Conditions The project site consists of a rectangular-shaped lot with about 200 feet of frontage along AirpoR Road. l he upper(westem)portion of the site has been graded and is generally level. 1he eastem portion of the site slopes down steeply to a wetland (identified by others). The site is vege[ated with blackberry bushes, grass, and scattered trees. A paved access roadway is located along the northem site boundary. Geology Most of the Puget Sound Region was affected by past intrusion of continental glaciation. The last period of glaciation, the Vashon Stade of the Fraser Glaciation, ended approximately 10,000 to 11,000 years ago. Muny of the geomorphic features seen today are a result of scounng and overriding by glacial ice. During the Vashon Stade, the Puget Sound region was overridden by � over 3,000 feet of ice. Soil layers ovenidden by [he ice sheet were compacted to a much greater Cornerstone Geotechnical, Inc. 3��