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2012 TIDEWATER STOCKTON WORK PLAN FOR SEPARATE PHASE HYDROCARBON REMOVAL <br />AT THE WATERFRONT TOWERS PARKING LOT <br />____________________________________________________________________________ <br />3 <br />50 ft bgs. Subsurface material in the B-zone consists of poorly graded sands and silty sands. <br />Below 50 ft bgs, clay and silt with some imbedded sand is encountered and extends to a depth <br />of approximately 64 ft bgs, underlain by sands and silty sands of varying moisture extending to <br />a depth of approximately 73 ft bgs. Clay is encountered below the sands to an approximate <br />depth of 84 feet bgs, underlain by a sand/silty sand layer extending to approximately 92 ft bgs. <br />This 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 ft bgs, underlain by a sand/silty- <br />sand layer with some interbedded clay to a depth of approximately 130 ft bgs. This stratum is <br />designated as the D-Zone. Clay and silt is encountered below this sand layer to a total depth <br />explored of 140 ft 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.