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WORK PLAN FOR ADDITIONAL SOIL VAPOR SURVEY <br /> Brief Background <br /> May 30, 2014 <br /> the B-zone consists of poorly graded sand and silty sand. Below 50 ft bgs, clay and silt <br /> with some imbedded sand is encountered and extends to a depth of approximately <br /> 64 ft bgs, underlain by sand and silty sand of varying moisture extending to a depth of <br /> approximately 73 ft bgs. Clay is encountered below the sands to an approximate <br /> depth of 84 ft bgs, underlain by a sand/silty sand layer extending to approximately 92 ft <br /> bgs. This stratum is a water-bearing zone identified as the C-Zone. Below this sand <br /> layer, imbedded clay and silt are encountered to a depth of approximately 115 ft bgs, <br /> underlain by a sand/silty sand layer with some imbedded clay to a depth of <br /> approximately 130 ft bgs. This stratum is designated as the D-Zone. Clay and silt are <br /> encountered below this sand layer to a total depth explored of 140 ft bgs. <br /> Groundwater beneath the Site is influenced by the Stockton Channel to the north and <br /> the Mormon Slough to the south. The groundwater flow direction for the shallow and <br /> deeper groundwater bearing zones is generally to the east-northeast across the Site. <br /> 2.4 <br />