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' INTRODUCTION <br /> i <br />' At the request of ExxonMobil Refining and Supply Company, ETIC Engineering, Inc has prepared <br /> this quarterly groundwater monitoring report for former Exxon Retail Site 7-3942 This report <br /> presents the results for the most recent groundwater monitoring conducted at the site and summarizes <br /> recent site activities The report also presents results for remediation system monitoring <br /> Groundwater monitoring results, well construction details, a groundwater monitoring plan, and <br /> system monitoring results are summarized in the attached figures and tables Groundwater <br />' monitoring protocols, field data, and analytical results are provided in the attached appendixes <br />' GENERAL SITE INFORMATION <br /> Site name: Former Exxon Retail Site 7-3942 <br />' Site address: 4444 North Pershing Avenue, Stockton, California <br /> Current property owner: Edna I Filnppz Family LP <br /> Current site use: Vacant lot <br /> Current phase of project: Groundwater monitoring, risk evaluation <br /> Tanks at site- Four former underground storage tanks (used oil, three grades <br /> of gasoline) <br /> Number of wells: 30 (22 onsite, 8 offsite) <br /> GROUNDWATER MONITORING SUMMARY <br /> Gauging and sampling date. 4 December 2001 <br /> Wells gauged and sampled IW1, MW2-MW5, RW2, RW4, V1-V3, UVB-MW2 <br /> Wells gauged only- MWl, MW6-MW10, MW12, MW13, RW1, V4, UVB-MWI <br />' Groundwater flow direction Northeast <br /> Groundwater gradient: 0 004 <br /> Remediation system status: UVB system not operating <br /> Well screens submerged: IW1, MW12, MW13, RWI, RW2, RW4, VI-V4, SW2, <br /> UVB-MW1, UVB-MW2 <br /> Well screens not submerged MW 1-MW 10 <br /> Liquid-phase hydrocarbons- Not observed or detected <br /> Laboratory. Southern Petroleum Laboratories, Inc , Houston, Texas <br /> Analyses performed <br /> • Total Petroleum Hydrocarbons as gasoline by modified EPA Method 8015 <br /> • Benzene, toluene, ethylbenzene, and total xylenes by EPA Method 8021B <br /> • Methyl t-butyl ether by EPA Method 8260B <br /> G 1P ojects1739421MASTER4WP\Q1201L3942:ext doc 1 <br />