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r <br /> KRAZAN&ASSOCIATES, INC. <br /> KA Project No. 092-20006 <br /> DRAFT Geotechnical Engineering Investigation <br /> 11 Everett Water Main"V" <br /> May 7,2020 <br /> Page No.3 <br /> or abandonment of valves, fire hydrants, water service lines and installation of new water meter boxes <br /> ' and setters,related appurtenances and surface restoration. <br /> SUBSURFACE CONDITIONS <br /> Subsurface Evaluation <br /> Thirteen (13) exploratory soil borings were completed to evaluate the subsurface soil and groundwater <br /> conditions. The borings were completed on April 66 and 7t', 2020 with a subcontracted drill rig. <br /> Krazan subcontracted traffic control for worker and public safety. A City of Everett street use permit <br /> was obtained prior to commencing the field work. <br /> The soil borings extended to depths of approximately 6.5 to 11.5 feet below the existing road surface. <br /> A geotechnical representative from Krazan and Associates was present during the explorations, <br /> examined the soils and geologic conditions encountered, obtained samples of the different soil types, <br /> and maintained logs of the explorations. The approximate locations of the borings are shown on the <br /> Schematic Site Plans in Figures 2 through 4. <br /> Representative samples of the subsurface soils encountered in the geotechnical explorations were <br /> collected and sealed in plastic bags and transported to our laboratory. The soils encountered in the <br /> explorations were visually classified in general accordance with the Unified Soil Classification System <br /> (USCS). A more detailed description of the field investigation is presented in Appendix A. <br /> Geologic Setting <br /> The "Geologic Map of the Everett 7.5-Minute Quadrangle, Snohomish County, Washington,"prepared <br /> by James P. Minard (USGS, 1985) and the "Geologic Map of the Marysville Quadrangle, Snohomish <br /> County, Washington," prepared by James P. Minard (USGS, 1985) indicate that the site areas are <br /> underlain by Quaternary Vashon glacial till (Qvt) and Quaternary Vashon advance outwash (Qva). <br /> Glacial till generally consists of a compact, unsorted mixture of clay, silt, sand, gravel, cobbles and <br /> boulders. Glacial advance outwash typically consists of compact, poorly to moderately sorted sand and <br /> gravel. <br /> Subsurface Profile <br /> The roadway surfaces in the three project areas consisted of asphalt pavement. However, we <br /> encountered a layer of concrete, approximately 10 inches thick, underlying the asphalt surface in soil <br /> boring B-1 at the intersection of Olympic Boulevard and Seahurst Avenue. <br /> I <br /> Krazan&Associates,Inc. <br /> Offices Serving The Western United States <br /> 1 <br />