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NNE1 <br /> am BMW' ' EMOME MUM-92EM <br /> y Exxon cunpany USA <br /> 202/225-2745.02 <br /> August 21 . 1987 <br /> under generally unconfined aquifer conditions , althot-,gh Plinor <br /> } <br /> confined aquifers exist . A. barrier to saline groundwater <br /> intrusion occurs along the west side of Stockton and is formed by <br /> a depositional contact between the deltaic deposits to the west <br /> n <br /> and the alluvial deposits to the east . <br /> F". The materials immediata'.y .underlying the site consist : <br /> predominantly of clays and sands with lesser amounts of silt, ' <br /> pry silty clay and silty sand with increasing depth. Alternating <br /> ; . beds of clayey sand, silty sand, silt . and clay were encountered. <br /> ' The wells were terminated it. light brown , hard clay which was . <br /> encountered at approximately 58 feet below grade. The water <br /> bearing zone ,. composed primarily of fine to silty sand , was <br /> encountered at approximately 48 feet. ' <br /> The June 26 . 1987 monitoring visit recordedg roundwater <br /> between 47 and 50 feet below <br /> grade. A summary of the groundwater: <br /> AM monftoring data for the site is presented in Table 1 . Based on <br /> information from the groundwater monitorings and from other <br /> - -- - -- <br /> project sites. in the near vicinity, the groundwater gradient (see <br /> Figure 3, Piezometric Map) underlying this site was .determined to <br /> be. relatively flat <br /> y ( less than . 5 percent ) and .toward the <br /> northeast , All groundwater in the Stockton area Is considered to . <br /> be a potential drinking 'water source and' is treated as such. <br /> �� <br /> 10 <br />