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S E C O R <br /> and silt with some imbedded sand is encountered and extends to a depth of approximately 64 <br /> feet bgs, underlain by sands and silty sands of varying moisture extending to a depth of <br /> approximately 73 feet bgs. Clay is encountered below the sands to an approximate depth of 84 <br /> feet bgs, underlain by a sand/silty sand layer extending to approximately 92 feet bgs. This <br /> stratum is a water-bearing zone identified as the C-Zone. Below this sand layer, imbedded <br /> clays and silts are encountered to a depth of approximately 115 feet bgs, underlain by a <br /> sand/silty sand layer with some imbedded clay to a depth of approximately 130 feet bgs. This <br /> stratum is designated as the D-Zone. Clay and silt is encountered below this sand layer to a <br /> total depth explored of 140 feet bgs. <br /> Groundwater beneath the Site is influenced by the Stockton Channel to the north and the <br /> Mormon Slough to the south. The regional groundwater flow direction for the shallow and <br /> deeper groundwater bearing zones is generally to the east-northeast. <br /> Additional Deep Zone Assessment Work Plan.final.doc <br /> Tidewater Stockton <br /> March 14,2008 <br /> 3 <br />