3003 COLBY AVE COURTYARD BY MARRIOTT 2021-03-09

r Proposed Everett Hotel Property Environmental Site Characterization and Everett, Washington Remediation Recommendations surface and the first sample, which was collected at a depth of approximately 2.5 feet. A weathered till horizon was not encountered at the locations of borings EB-5, EB-6, EB-9, and EB-10. At the locations of borings EB-8 and EB-11, the till extended to depths of approximately 58 feet and 40.5 feet, respectively. In the other borings where the lodgement till was encountered, the till extended beyond the maximum depths explored of approximately 18.5 to 59 feet. Vashon Advance Outwash Sediments encountered below the fill at the location of exploration boring EB-1 generally consisted of medium dense to very dense sand with variable silt and gravel content and hard, sandy silt with minor gravel content. Similar sediments were encountered below the till at the locations of borings EB-8 and EB-11. We interpret these sediments to be representative of Vashon advance outwash. The Vashon advance outwash stratigraphically underlies the Vashon lodgement till and was deposited by meltwater streams that emanated from the advancing glacial ice during Vashon time. The high relative density characteristic of the Vashon advance outwash is due to consolidation by the glacial ice that overran these sediments subsequent to their deposition. The Vashon advance outwash sediments extended beyond the maximum depths explored in borings EB-1, EB-8, and EB-11 of approximately 29 feet, 59 feet, and 53.5 feet, respectively. Review of the regional geologic map titled Distribution and Description of the Geologic Units in the Everett Quadrangle, Washington by James Minard (1981) indicates that the area of the I subject site is underlain by Vashon lodgement till with Vashon advance outwash sediments exposed at the ground surface several blocks to both the east and west. Our interpretation of the sediments encountered in our explorations is in general agreement with the regional geologic map. 1.3.2 Hydrology Ground water seepage was encountered at the time of drilling near the base of the fill in 1 exploration boring EB-1 at a depth of approximately 12.5 feet. The water at this location appeared to be perched within the fill. The upper portion of the underlying advance outwash was unsaturated, but an additional zone of perched ground water was encountered deeper within the outwash. This additional ground water was present near the base of a stratum of clean, fine sand and was perched atop an underlying layer of silt. Exploration boring EB-1 was completed as a monitoring well to allow measurement of the static ground water level and to allow collection of ground water samples for laboratory analysis. A static ground water level of 1J9:G-`fee low ground surface was measured in the welt 3 days after well completion:" INr o round water was observed during drilling of boring EB-6; however, after drilling was completed and the auger was removed from the boring, several niches of water were observed at the bottom of the boring. At the time that the ground water was observed, the boring had August 24, 2009 ASSOCIATED EARTH SCIENCES, INC. TJP/tb-KV090168A5-Projects120090168IKVIWP Page 4