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was encountered in previously administered borings by Dames and <br />Moore. <br />Dames and Moore further reported that the foregoing fine-grained <br />materials were dry, primarily light brown to brown in color, and commonly <br />encountered with iron oxide staining, trace percentage of mica, and small <br />diameter angular to subangular gravel. <br />The second zone is reported by Dames Moore to contain sandy silt/silty <br />sand zone, which is dark gray, medium, soft, moist, medium to high <br />plasticity clay. Previously administered borings by Dames and Moore <br />indicated that the clay layer extends throughout the majority of the site. <br />Furthermore, this clay layer is reported to extend all the way down to the <br />capillary fringe zone at the point where the clay material transition into <br />other underlying materials. <br />The third zone is a laterally discontinuous sequence of materials that <br />follow the clay zone. None of the monitoring wells (MW-1through 4) <br />installed Dames and Moore extended beyond this zone. This zone is <br />primarily embedded by brown micaceous silty clay and clayey silt. <br />According to Dames and Moore's BSI, one saturated zone was identified <br />beneath the site. The saturated zone is composed of varying lithology and <br />appeared to be continuous beneath the site. The static water table was <br />encountered at 12 feet below ground surface. Ground water flow direction <br />was determined by Dames and Moore to have southeasterly direction <br />away from the San Joaquin River and the deepwater ship channel. <br />Dames and Moore calculated a horizontal ground water gradient of .0029 <br />in the northern portion of the site and .0043 for the southern portion of the <br />site. <br />3