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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 ieport <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 6 March 2002, the date of the last <br /> monitoring event, until 11 June 2002, the date of the recent monitoring event The report also <br /> presents results for remediation system monitoring Groundwater monitonng 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 project Groundwater monitoring <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 11 June 2002 <br /> Wells gauged and sampled fWl, MW4-MW6, RWI, RW2, RW4, V1-V4, UVB-MW1, <br />' UVB-MW2 <br /> Wells gauged only MW1-MW3 <br /> Groundwater flow direction Northeast <br />' Groundwater gradient: 0 004 <br /> Remediation system status during <br /> groundwater momtoring event WB system not operating <br /> Well screens submerged- IW1, RWI, RW2, RW4, Vl-V4, UVB-MW1, WB-MW2 <br /> Well screens not submerged. MWI-MW6 <br /> Liquid-phase hydrocarbons: Observed in V 1-V3, UVB-MW 1 (sheen to 0 0l feet) <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 by EPA Method 8021B <br /> • Methyl t-butyl ether by EPA Method 8260 (confirmation samples) <br /> 6 1PmJeds173942\ou alcrN-p'gO66213942mxt dog 1 <br />