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are presented in the drilling logs, attached as Appendix A Figure 3 is a geologic cross-section <br /> showing the generalized lithologic relationships <br /> HYDROGEOLOGY <br /> SSB conducted a survey of nearby wells during the preliminary investigation Their findings <br /> indicated a City of Stockton well (No 11) is located at the corner of Inglewood and Leslie <br /> Avenues A number of private wells are located within 1,000 feet to the west of the site in a <br /> county residential area, and one to the northwest at the Carden School In addition, a number <br /> of wells are located in a small commercial center south of the site, however, they are no longer <br /> used, as the occupants currently utilize the City of Stockton water system (personal <br /> communication by SSB with Mr Ray Borges, City of Stockton) Further information on well <br /> ownership is presented in SSB's report dated November 16, 1992 <br /> In May 1991, during installation of the initial wells, SSB encountered groundwater at about 58 <br /> feet below grade The hydraulic gradient was measured to be 0 0017 to the east-southeast <br /> Subsequent measurements have confirmed this flow direction although the static groundwater <br /> level has gradually risen since the investigation <br /> During drilling of the new wells, groundwater was encountered at about 48 feet below grade <br /> The hydraulic gradient was measured to be 0 0023 to the east-southeast on April 23, 1994 This <br /> measurement is in accord with previous measurements of flow direction at the site The <br /> hydraulic gradient measurement is shown on Figure 4 <br /> SITE INVESTIGATION <br /> On April 22, 1994, Thrifty installed three vadose monitoring wells and two groundwater <br /> monitoring wells at the site The vadose wells (VWA, VWB, and VWC) were installed around <br /> the perimeter of the underground tanks and are designed for use in a vapor extraction system, <br /> Page 3 <br />