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' INTRODUCTION <br /> • <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 7-3708 This report <br /> presents the results for the most recent groundwater monitoring conducted at the site and summarizes <br /> recent site activities This report covers site activities from 29 May 2003, the date of the last <br /> monitoring event, until 18 September 2003, the date of the recent monitoring event Groundwater <br /> monitoring results,well construction details,and a groundwater monitoring plan are provided in the <br />' attached figures and tables Groundwater monitoring protocols, field data,and analytical results are <br /> provided in the attached appendixes <br />' GENERAL SITE INFORMATION <br />' Site name- Former Exxon Retail Site 7-3708 <br /> Site address: 2705 Country Club Boulevard, Stockton, California <br />' Current property owner: Palisades Gas & Wash, Inc <br /> Current site use Active USA-branded station operated by U S A Petroleum <br /> Current phase of protect Joint groundwater monitoring <br /> Tanks at site Two underground storage tanks (diesel fuel, unleaded <br /> gasoline) <br /> Number of wells. 12 (8 onsite, 4 offsite) <br /> GROUNDWATER MONITORING SUMMARY <br />' Gauging and sampling date 18 September 2003 <br /> Wells gauged and sampled MW1, MW4-MW10, VEW1 <br />' Wells gauged only. VEW3 <br /> Groundwater flow direction Northeast <br /> Groundwater gradient 0 001 <br /> Well screens submerged: MW I, MW4-MW6 <br /> Well screens not submerged MW7-MW10, VEW1, VEW3 <br /> Liquid-phase Hydrocarbons: Not observed or detected <br />' Laboratory TestAmenca, Inc , Nashville, Tennessee <br /> Analyses performed <br /> ' • Total Petroleum Hydrocarbons as gasoline by EPA Method 8015B <br /> • Benzene, toluene, ethylbenzene, and total xylenes by EPA Method 8021B <br /> • Methyl t-butyl ether, ethyl t-butyl ether, t-amyl methyl ether, t-butyl alcohol, <br /> ' 1,2-dibromoethane, 1,2-dichloroethane, and diisopropyl ether by EPA Method 8260B <br /> ADDITIONAL ACTIVITIES PERFORMED AT SITE <br /> Joint groundwater monitoring was performed with the environmental consultant for the neighboring <br /> ' 7-Eleven site <br /> ' pro}ccIV74708%msstcr%vp yU 103 17081em Jou 1 <br />