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' determinations are shown on the appropriate boring logs in Appendix A and in the plasticity <br /> charts shown in Figures B-2. <br /> 1 5.0 SUBSURFACE CONDITIONS <br /> The geology and subsurface conditions beneath the north end of the wharf were inferred from <br /> visual classification of soil samples obtained from the current geotechnical boring and historic <br /> exploration data from previous projects in the vicinity provided by MN and the Port. The <br /> following sections include a description of the general geology, geologic units, and the <br /> subsurface soil and groundwater conditions encountered in the project area and assumed to exist <br /> for purposes of performing engineering evaluations and providing design recommendations. <br /> 5.1 Existing Geotechnical Data <br /> ' The Port and MN provided reports of previously performed geotechnical explorations at the <br /> project site, including: <br /> ' Report of Geotechnical Investigation, South Terminal Project,Everett,Washington <br /> (Dames &Moore, 1991) <br /> ■ As-built Drawings,Weyerhaeuser Company—Cargo Dock&Warehouse, Port of <br /> Everett,Washington(Weyerhaeuser Company, 1978) <br /> The above-referenced reports included geologic reconnaissance and subsurface explorations of <br /> the project site. <br /> Numerous geotechnical explorations have been performed near the wharf The closest borings <br /> were completed for the Weyerhaeuser Company for the initial construction of the wharf and are <br /> documented in as-built drawings of the wharf. Specifically,borings 1 and 2 were considered <br /> when evaluating the subsurface conditions beneath the project site. Additional borings have <br /> been completed to the north and east of the project site and were considered in our interpretation <br /> of the subsurface conditions. It should be noted that these borings were completed for a variety <br /> of purposes that did not include the installation of piles; therefore, in some cases the information <br /> presented in the borings was not sufficient for pile design at the current project site. <br /> 5.2 Regional Geologic Setting <br /> The project is located in the central portion of the Puget Lowland, an elongated,north-south <br /> depression situated between the Olympic Mountains and the Cascade Range. Geologists <br /> generally agree that the Puget Sound area was subjected to six or more major glacial events. The <br /> 21-1-21962-003-R2.doex/wp/cp 21-1-21962-003 <br /> 5 <br /> r <br />