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Stantec 0 0 <br /> 2010 TIDEWATER STOCKTON WORK PLAN <br /> shallow zone predominantly consists of silts, silty sands, and silty gravels from four to ten feet <br /> bgs, and then organic clays, clays, high permeability silts, and lenses of silty sands and poorly <br /> graded sands to depths ranging from 25 to 40 feet bgs. The shallow zone is generally underlain <br /> by low permeability silts and clays (with an occasional, thin, silty sand or poorly graded sand <br /> lens) of highly variable thickness. A deeper groundwater bearing zone (B-Zone) is encountered <br /> at a depth of approximately 42 feet bgs and extends to approximately 50 feet bgs. Subsurface <br /> material in the B-zone consists of poorly graded sands and silty sands. Below 50 feet bgs, clay <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 interbedded 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 /> 1.4 <br />