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SECTIONTWO Historical Site Investigations <br /> 2.1 HISTORICAL SITE INVESTIGATIONS <br /> Existing plans indicate that the west abutment of the existing structure is supported by a 12'-9" <br /> width spread footing foundation, and the east abutment is supported by a 10'-0" width spread <br /> footing. Information concerning the pier is limited, but the plans indicate that it too is supported <br /> by a spread footing foundation. No existing subsurface data was located from the original <br /> construction. <br /> In June 2000, three borings were drilled by SKS Engineers, Inc. at the ADM Research Center <br /> located approximately 1600 feet to the southwest of the project site. These borings were <br /> provided to URS to assist in the development of the exploration program. All three borings were <br /> drilled to 26 feet deep and indicated medium-stiff silty clays in the upper 15 feet of the boring, <br /> with strengths increasing to very stiff and hard below 15 feet deep. <br /> i <br /> 1 <br /> I <br /> 2-1 <br /> 1 <br />