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CLEAER <br /> R`IVAT <br /> G R O U P <br /> • Envrronmrnlar Services <br /> The major surface drainage feature in Stockton is the San Joaquin River which flows from the central <br /> portion of the San Joaquin Valley to Suisun Bay located towards the northwest The San Joaquin river <br /> is located 4 miles southwest of the subject site According to Brown and Caldwell's 1995 CAP <br /> groundwater Stockton generally flows towards the northwest in the direction of Stockton Divertion <br /> Channel Groundwater in shallow water-bearing units in Stockton is found under unconfined conditions <br /> and is designated as a beneficial use unit by the State Water Resources Control Board <br /> Local Geology and Hydrggeology <br /> ltants (Brown and Caldwell, HETI) indicate that the site is <br /> Reports prepared by previous consu <br /> level Soils beneath the site have been described as <br /> situated at an elevation of 25 feet above mean sea <br /> silts, sands, and clays typical of interbedded alluvial deposits <br /> The closest surficial water-body is a local irrigation canal located approximately one half-mile <br /> northeast of the site Groundwater beneath the site is currently located at approximately 48 feet bgs <br /> and flows towards the southwest at a relatively flat gradient of 0 003 ft/ft The disparity between <br /> local and regional groundwater flow direction is unclear <br /> County Request for Well Installation Work <br /> Based on continued detection of moderate levels of hydrocarbons in the groundwater and the fact t at <br /> the well screens are now fully submerged,the County requested the installation of new wells on-site to <br /> determine groundwater quality information from properly screened <br /> Based on this request,Clearwater submitted a workplan dated June 1, 1998 proposing the installation of <br /> four on-site well which would accommodate the current groundwater table This workplan was <br /> subsequently approved by the County and serves as the guiding document for this most recent phase of <br /> assessment work <br /> Objective of Site Investigation <br /> ent was to evaluate the current distribution of dissolved-phase <br /> The objective of this site assessm <br /> hydrocarbon contamination in the shallow subsurface As requested by County, site characterization <br /> activities included the following <br /> Page 3 <br />