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Subsurface Exp[orotion, Geofogic Haznrd, and <br /> Everetr Schoo!District Marnrenance Facility Preliminary Georechnical Englneenng RepoK <br /> Everett, Washington Design Recommendations <br /> sands. The existin�, fill is suited for parking lot support with somc reworking and/or <br /> recompacting of its upper 12 inches. Most of the fill may be suitable for reuse in strucmral <br /> areas if pockets of debris and silt are removed and the soil recompacted as described in section <br /> 9.0, Structural Fi!!. <br /> Glaciolacuslrine <br /> Below the fill, a medium dense to dense silry sand and stiff to very stiff silt deposit was <br /> encountered. This glaciolacustrine deposit had variable amounts of sand and trace amounts of <br /> clay. This materiaf was encountered in all of the exploration pits. The in-sim glaciolacustrine <br /> soil is well suited for the support of the anticipated structure. Its reuse as structural fill on the <br /> site will be limited to dry weather or dry site conditions. Because of its fine-grained nature, <br /> this material should be considered moisture sensitive and should be reused per section 9.0, <br /> Slructuraf Fill. <br /> 4.2 HvdroloRY <br /> Ground water seepagc was not encountered in six of our exploration pits (EP-2 through EP-7) <br /> at the time of our tielcl stu�y. Slight seepage, estimated at between 1 and 2 gallons per minute <br /> was encountered in exploration pit EP-1 at approximately 9 feet below the surface. The <br /> Cground water encountercd probably indicated a perched condition. The perched water occurs <br /> when surface watcr infiltrates down through relatively permeable soils (fill) and becomes <br /> trapped or perched atop a comparatively impermeable barrier such as the underlying in situ <br /> glaciolacustrine deposit. During the wetter winter and early spring months, ground �varer <br /> levels will likely rise above the current level. It should be noted that fluctuations in thc level <br /> of the ground water may also occur at any time of the year and due to variations in rainfall, <br /> irrigation, and stream Ievels. <br /> ;�i: � .:� <br /> � ::��, <br /> �� <br /> �'4., <br /> \ <br /> May l, 2001 ASSOCIATED EARTH SCIENCES, 1NC. <br /> lOGdn-KE0105l�f-D:IxyianU-01-lY1K Page 4 \ <br /> LJ <br />