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Geotechnical Engineering Report-Revised lrerracon <br /> Kaiser Everett Medical Center Everett,Washington -- s--- y� <br /> December 18, 2019 Terracon Project No. 81195071 GeOReporf <br /> Boring Number Approximate Depth to Groundwater while Drilling (feet) <br /> B-01-19 15 <br /> B-02-19 10 <br /> B-03-19 30 <br /> B-05-19 10 <br /> B-07-19 26 <br /> B-04-19, B-06-19, B-08-19, B-09- <br /> not encountered 19 <br /> 1. Below ground surface <br /> 2. Inferred from change in sample moisture or from evidence of free water on drilling equipment <br /> 3. Likely perched water <br /> No static groundwater table was observed while drilling and the depths recorded above are <br /> interpreted as perched groundwater or wet lenses within the dense to very dense glacial till unit. <br /> Groundwater was not observed in the B-04, B-06, B-08 and B-09 borings while drilling. The soil types <br /> present at the site are often associated with perched groundwater in which the vertical infiltration of <br /> water is slowed by low permeability layers. <br /> Groundwater level fluctuations occur due to seasonal variations in the amount of rainfall, runoff <br /> and other factors not evident at the time the borings were performed. Therefore, groundwater <br /> levels during construction or at other times in the life of the structure may be higher or lower than <br /> the levels indicated on the boring logs. The possibility of groundwater level fluctuations should be <br /> considered when developing the design and construction plans for the project. <br /> GEOTECHNICAL OVERVIEW <br /> The origin, history, and placement conditions of existing fill is not known and no documentation <br /> of the placement of the existing fill is available to us. The composition of these fill soils is <br /> anticipated to be highly variable and may contain organics and/or debris which may render some <br /> portions of the soil unsuitable and not appropriate for reuse. It may be possible that upper portions <br /> of the noted weathered glacial till layer may be composed of reworked weathered glacial till. We <br /> recommend that all existing fill, if encountered, be removed beneath the proposed building. <br /> Existing fill beneath future pavements should also be removed, but the depth may be limited to a <br /> Responsive ■ Resourceful ■ Reliable <br />