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1.0 INTRODUCTION AND PROJECT DESCRIPTION <br /> This report presents the results of GeoEngineers, Inc.'s (GeoEngineers) geotechnical engineering design <br /> services for the Casino Road Renovation project at the Community Transit Kasch Park Base in Everett, <br /> Washington. The renovation project is located at 2312 West Casino Road as shown in the Vicinity Map <br /> (Figure 1) and the Site Plan (Figure 2). GeoEngineers' geotechnical engineering services have been <br /> completed in general accordance with our proposal dated March 7, 2019. <br /> We understand that Community Transit is planning to relocate administrative staff from surrounding areas <br /> to a central administration facility due to the expansion of the bus services in Snohomish County through <br /> 2030. Community Transit will renovate the existing bus training and maintenance facility building to <br /> accommodate the relocation of administrative staff.The existing bus training and maintenance facility is a <br /> two-story concrete tilt panel office building that was built in the 1970s. Renovation of the office building <br /> includes the construction of two new entryways, a large detention vault for stormwater, and various <br /> associated hardscape improvements including new asphalt concrete in the parking lot,concrete sidewalks, <br /> landscaped areas, etc. Key geotechnical design considerations include seismic parameters for the <br /> upgrade, excavation and temporary slopes, recommendations for earthwork and trench backfill, shallow <br /> foundations,and subsurface walls or retaining walls, if required. <br /> 2.0 FIELD EXPLORATIONS AND LABORATORY TESTING <br /> 2.1. Field Explorations <br /> The subsurface conditions were evaluated by reviewing previous exploration completed at the site and by <br /> drilling three additional borings to depths ranging from 21 to 31 feet below the existing ground surface <br /> (bgs). Borings were observed by a geotechnical engineer from our firm who collected samples and classified <br /> the soils encountered.Samples were brought back to our laboratory for further analyses.The approximate <br /> locations of the borings are shown on Figure 2. Details of the field exploration program and the boring logs <br /> are presented in Appendix A. Previous borings completed at the site by GeoEngineers are provided in <br /> Appendix B. <br /> 2.2. Laboratory Testing <br /> Soil samples were collected from the borings, taken to our laboratory and evaluated to confirm or modify <br /> field classifications,as well as to evaluate engineering properties of the soil. Representative samples were <br /> selected for laboratory testing consisting of determination of moisture content and grain size distribution. <br /> A description of the laboratory testing and the test results are presented in Appendix A. <br /> 3.0 SITE CONDITIONS <br /> 3.1. Geology <br /> The Puget Sound basin is a region of Quaternary (last 3 million years) sediments that range in thickness <br /> between 800 and 2,400 feet. Bedrock exposures are present on the basin margins to the east and west in <br /> the Cascade and Olympic Mountains, respectively. The basin area has been repeatedly overridden by <br /> Pleistocene (between 11,000 and 3 million years ago) continental glacial ice depositing till, glacial sand <br /> GEoENGINEERS_ November 14,2019 Page 1 <br /> File No.2095-019-07 <br />