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I PROJECT QUARTERLY UPDATE REPORT <br /> 7-ELEVEN STORE NO. 20680 <br /> 9110 THORNTON ROAD <br /> STOCKTON, CALIFORNIA <br /> IMAY 11, 1992 <br /> 1.0 INTRODUCTION <br /> IThis report presents a quarterly update of routine monitoring and sampling activities conducted <br /> between January 1, 1992, and March 31, 1992, by Groundwater Technology, Inc , on behalf of The <br /> I Southland Corporation (Southland), at 7-Eleven Store No 20680 The site is located at 9110 <br /> Thornton Road in Stockton, California (Figure 1) As shown on the site plan (Figure 2), the store is <br /> on the northern corner of Thornton Road and Waudman Avenue in a mixed commercial and <br /> residential area <br /> IDetailed descriptions of the background and subsurface conditions for the site have been discussed <br /> in previous reports, and presented most recently in the February 21, 1992, Protect Quarterly UAdate <br /> and Monitoring Well Installation Re ort 7-Eleven Store 9110 Thornton Road Stockton California <br /> The February 21, 1992, report includes a description of the installation of three additional monitoring <br /> I wells (MW-18, MW-19, and MW-20) , to provide additional data on (1) residual hydrocarbon <br /> concentrations in the on-site soils, and (2) the quality of the water on-site and hydraulically <br /> downgradient of the site <br /> 2 0 WORK SCOPE <br /> i <br /> Services performed by Groundwater Technology during this reporting period Included the following <br /> ■ Monitored on-site and off-site observation wells for depth to water and depth to <br /> separate-phase hydrocarbons on January 30, February 24, and March 30, 1992 <br /> ■ Analyzed groundwater samples collected from three monitoring wells, two <br /> monitoring-well clusters, and two pumping wells on March 30, 1992 <br /> I <br /> 'GROUNDWATER <br /> TECHNOLOGY. INC <br /> I <br />