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. HYDROGEOLOGY SSB conducted a survey of nearby wells during the prelimusary investigation Their findings indicated a City of Stockton well (No 11) is located at the corner of Inglewood and Leslie Avenues A number of private wells are located within 1,000 feet to the west of the site in a county residential area, and one to the northwest at the Carden School In addition, a number of wells are located in a small commercial center south of the site, however, they are no longer used, as the occupants currently utilize the City of Stockton water system (personal commuincation by SSB with Mr Ray Borges, QtOo of Stockton) Further information on well ownership is presented in SSB's report dated November 16, 1992 In May 1991, during installation of the irutial wells, SSB encountered groundwater at about 58 feet below grade The hydraulic gradient was measured to be 0 0017 to the east-southeast/Subsequent measurements have confirmed this flow direction although the static groundwater level has gradually risen since the investigation During drilling of the new wells, groundwater was encountered at about 48 feet below grade The hydraulic gradient was measured to be 0 0013 to the east-southeast on August 16, 1995 Tlus measurement is in accord with previous quarterly measurements of the groundwater flow direction at the site The hydraulic gradient measurement is shown on Figure 4 SITE INVESTIGATION On July 11, 1995, Thrifty installed three off-site groundwater monitoring wells (MW5, MW6 and MW9) adjacent to the property Well MW5 was installed in the driveway west of the site that is used as an access to the Pegasus Restaurant located just south of the property Well MW6 is located across Pacific Avenue to the east, within a large traffic island Well MW9 is located north of the site in the north sidewalk of Rivara Road Figure 2 shows the locations of the wells Documentation for permitting of these wells is presented in Appendix B Page 4