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I <br /> I <br /> Subsurface Exploration, Geologic Hazard, and <br /> I Krebs Property Preliminary Geotechnical Engineering Report <br /> Everett, Washington Project and Site Conditions <br /> I Review of the regional geologic map titled Distribution and Description of the Geologic Units <br /> in the Everett Quadrangle, Washington by James Minard (1981) indicates that the area of the <br /> subject site is underlain by Vashon lodgement till. Our interpretation of the sediments <br /> encountered in our explorations is in general agreement with the regional geologic map. <br /> 4.2 Hydrology <br /> iSlow, spotty ground water seepage was encountered in exploration pit EP-2 at a depth of <br /> approximately 10 feet. Ground water seepage was not encountered in any of the other <br /> 1 explorations accomplished for our study. Due to the limited vertical and horizontal <br /> distribution of the ground water encountered, it is our opinion that this seepage is <br /> representative of perched ground water. Although not encountered in any of our explorations, <br /> I it is common in areas underlain by lodgement till for seepage to seasonally accumulate at the <br /> base of the weathered lodgement till sediments. This seepage, known as interflow, occurs <br /> when surface water percolates down through the surficial weathered till sediments and becomes <br /> I perched atop the underlying, lower-permeability unweathered till sediments. It is possible that <br /> interflow may periodically accumulate at the site. It should be noted that the occurrence and <br /> level of ground water seepage may vary in response to such factors as changes in season, <br /> Iprecipitation, and site use. <br /> I <br /> I <br /> 1 <br /> I <br /> I <br /> I <br /> I <br /> I <br /> February 13, 2007 ASSOCIATED EARTH SCIENCES, INC. <br /> ITJP/Id-KE070023A1-Projects 1200700231KEIWP Page 4 <br />