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2401 Taylor Drive Geotechnical Engineering Study <br /> Everett, Washington <br /> Sod and Topsoil <br /> Soils encountered in unpaved near surface portions of the site in exploration borings typically <br /> consist of sod and topsoil. Sod and topsoil are approximately 0.5 feet thick at the site. The sod <br /> and topsoil are not suitable for the support of the planned building foundations or pavements. <br /> Whidbey Formation <br /> Soils encountered in the subsurface borings below the sod and topsoil at the site are interpreted <br /> to be Pre-Vashon aged Whidbey Formation to the full depths explored of 21.5 feet below the <br /> existing site grade. The soils encountered typically consisted of medium stiff to hard, moist, <br /> oxidized brown to tan fine sandy silt over very dense, tan to gray silty fine sand. The native <br /> Whidbey Formation deposits are suitable for the support of the planned building foundations <br /> and pavements. <br /> Ground Water <br /> Ground water seepage was not encountered in exploration at the time of drilling in October 2019. <br /> It should be noted that the depth and occurrence of ground water seepage at the site likely varies <br /> in response to such factors as changes in season, amount of precipitation and site use. <br /> Geologic Mapping <br /> Review of the regional geologic map Distribution and Description of Geologic Units in the Mukilteo <br /> Quadrangle, Washington compiled by J.P. Minard (1982) indicates that the subject site is <br /> underlain by deposits of the Whidbey Formation. Our interpretation of the sediments <br /> encountered in our explorations is in general agreement with the regional geologic map. <br /> GEOLOLGIC HAZARDS <br /> The following discussion of applicable geologic hazards is based on review of the City of Everett <br /> Municipal Code (EMC) Chapter 19.37.080 and the geologic,topographic, and ground and surface <br /> water conditions as observed and discussed herein. The discussion will be limited to landslide <br /> and steep slope hazards, seismic hazards, and erosion hazards. <br /> Landslide Hazard Areas and Mitigations <br /> The site is relatively flat with a gentle slope down to the west on the west 4/5 of the side with <br /> the west 1/5 sloping down steeply to the west to the railroad tracks below that border Puget <br /> Sound. Based upon review of the EMC Chapter 19.37,080A(1)(a.1), the west 1/5 of the site is <br /> classified as a Very High/Severe Landslide Hazard Area. The base of the steep slope is protected <br /> from shoreline erosion by the railroad track embankment constructed at the base of the slope. <br /> November 6,2019 SONDERGARRD GEOSCIENCES, PLLC <br /> 2 <br />