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' INTRODUCTION <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 This report covers site activities from 11 June 2002, the date of the last <br /> monitoring event,until 10 September 2002,the date of the recent monitoring event The reportalso <br />' presents results for remediation system monitoring Groundwater monitoring results, well <br /> construction details, a groundwater monitoring plan, and system monitoring results are summarized <br /> in the attached figures and tables Groundwater monitoring protocols, field data, and analytical <br />' 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 Filippi Family LP <br /> Current site use: Vacant lot <br />' Current phase of protect. Groundwater monitoring <br /> Tanks at site. Four former underground storage tanks(used oil,three grades <br /> • of gasoline) removed July 1986 <br /> Number of wells: 30 (22 onsite, 8 offsite) <br />' GROUNDWATER MONITORING SUMMARY <br /> I Gauging and sampling date 10 September 2002 <br /> Wells gauged and sampled: 1W 1, MW2-MW5, RW 1, RW2, RW4, V1-V4, WB-MW1, <br /> UVB-MW2 <br />' Wells gauged only: MW 1, MW6, MW7, MW9, MW 13 <br /> Groundwater flow direction: Northeast <br /> Groundwater gradient: 0 004 <br /> Remediation system status during <br /> groundwater monitoring event: UVB system not operating <br /> Well screens submerged: 1W1, MW13, RW1, RW2, RW4, V1, V3, V4, UVB-MW1, <br />' UVB-MW2 <br /> Well screens not submerged- MW1-MW7, MW9, V2 <br /> Liquid-phase hydrocarbons Observed as a sheen in V4 and UVB-MW 1 <br /> Laboratory. TestAmenca, Inc , Nashville, Tennessee <br /> g Vmjmts173942vwteriwp1gC90213942tmt do 1 <br />