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1 <br /> APPENDIX B <br /> ' Cross Sections <br /> Stockton Service Center Subsurface Stratigraphy j <br /> ' The subsurface stratigraphyat the Stockton Service Center is composed of three <br /> P <br /> units The uppermost unit is a silty clay which acts as an upper semi-confining unit <br /> for the aquifer This silty clay extends to an average depth of ten feet below ground <br /> surface (bgs) The next unit is a fine to medium grained, silty sand which hosts the <br /> uppermost aquifer at the site Below the silty sand is a medium to high plasticity <br /> clay The aquifer is semi-confined by the clay units above and below The sand unit, <br /> ' and hence the aquifer, has an average thickness of 12 feet The lower clay unit was <br /> not encountered at every well location, and it has not been fully penetrated during <br /> ' drilling, so the thickness and depth of this unit are unknown Based on the regional <br /> geology, it has been assumed that no boundary conditions or substantial recharge <br /> areas exist within 1,000 feet of the site <br /> ' Three cross sections were constructed based on existing data for this report The <br /> cross sections were designed to traverse the site from north to south (Cross section <br /> C-C'), west to east (B-B'), and diagonally from the southwest to the northeast (A-A') <br /> The water levels displayed on the cross sections were recorded during the First <br /> ' Quarter 1994 groundwater monitoring event The well screen intervals are displayed <br /> on each cross section <br /> 1 <br />