6202 ASSOCIATED BLVD Geotech Report 2022-10-25

Proposed Everett Warehouse Project No. 2152.01 March 5, 2019 feet below existing site grade. The test results indicated organic contents ranging from 0.9 to 3.1 percent. A California Bearing Ratio (CBR) test was completed on a sample obtained from test pit TP-3. The test indicated a CBR value of about 34 at 95 percent compaction and about 11 at 90 percent compaction. Detailed results for proctor, organic content, and CBR testing are provided in Appendix B. CONCLUSIONS AND RECOMMENDATIONS General Based on our subsurface exploration program and associated research, we conclude that the proposed development is geotechnically feasible, contingent on proper design and construction practices and implementation of the recommendations presented in this report. Our recommendations are presented in the following sections. The recommendations contained in this report are based upon the results of field and laboratory testing (which are presented in Appendices A and B), engineering analyses, and our current understanding of the proposed project. ASTM and Washington State Department of Transportation (WSDOT) specification codes cited herein respectively refer to the current manual published by the American Society for Testing & Materials and the current edition of the WSDOT Standard Specifications for Road, Bridge, and Municipal Construction, (M41-10). Seismic Design Considerations The tectonic setting of western Washington is dominated by the Cascadia Subduction Zone formed by the Juan de Fuca plate subducting beneath the North American Plate. This setting leads to intraplate, crustal, and interplate earthquake sources. Seismic hazards relate to risks of injury to people and damage to property resulting from these three principle earthquake sources. The seismic performance of the development was evaluated relative to seismic hazards resulting from ground shaking associated with a design seismic event with a 2,475 year return period determined in accordance with the 2015 International Building Code (IBC). Conformance to the above criteria for seismic excitation does not constitute any kind of guarantee or assurance that significant structural damage or ground failure will not occur if a maximum level earthquake occurs. The primary goal of the IBC seismic design procedure is to protect life and not to avoid all damage, since such, design may be economically prohibitive. Following a major earthquake, a building may be damaged beyond repair, yet not collapse. IBC Seismic Design Parameters: Based on site location and soil conditions, the values provided below are recommended for seismic design. The values provided below are based on the 2015 IBC as the building code reference document. Page 4