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INTRODUCTION <br />' At the request of ExxonMobil Refining and Supply Company,ET1C 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 monitonng conducted at the site and summarizes <br />' recent site activities This report covers site activities from 4 December 2001, the date of the last <br /> monitoring event, until 6 March 2002, the date of the recent monitoring event The report also <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 Ground kater 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: 5 and 6 March 2002 <br /> Wells gauged and sampled IW 1, MW 1-MW 11, MW 13, RW 1, RW2, RW4, V1-V4, <br />' UVB-MW1, UVB-MW2 <br /> Wells gauged only None <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: I`W 1,MW 11,MW 13,RW 1,RW2,RW4,V1-V4,UVB-MW 1, <br /> UVB-MW2 <br /> Well screens not submerged: MW 1-MW 10 <br />' Liquid-phase hydrocarbons Not observed or detected <br /> Laboratory. TestAmenca, Inc , Nashville, Tennessee <br />' Analyses performed- <br /> 0 <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 8260B (confirmation samples) <br />' Additional comments: <br /> Well MW 12 was inaccessible <br />' g%projec[sg39421nws[Mwp\go02L3942uxt doc 1 <br />