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• INTRODUCTION
<br /> At the request of ExxonMobil Oil Corporation, ETIC Engineering,Inc has prepared this quarterly
<br />' groundwater monitoring report for former Exxon Retail Site 7-3942 This report presents the results
<br /> for the most recent groundwater monitoring conducted at the site and summanzes recent site
<br /> activities This report covers site activities from 22-23 June 2005,the dates of the last monitoring
<br />' event,until 12-13 October 2005,the dates of the recent monitoring event The report also presents
<br /> results for historical remediation system monitoring Groundwater monitoring results, well
<br /> construction details,a groundwater monitoring pian, 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 /> 1 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 /> lie
<br /> Tanks at site: Four former underground storage tanks(used oil,three grades
<br /> of gasoline)removed July 1986
<br /> Number of wells: 33 (25 onsite, 8 offsite)
<br /> I '
<br /> GROUNDWATER MONITORING SUMMARY
<br /> Gauging and sampling date: 12 and 13 October 2005
<br /> Wells gauged and sampled: 1W1, MW1, MW2, MW3, MW$, MW5, MW7, MW8,
<br />' MW10,MW13,RW1,RW2,RW4, SWI,SW2,UVB-MW1,
<br /> WB-MW2, V1-V4
<br /> Wells gauged only, MW6, MW9
<br /> I Groundwater flow direction, Northeast
<br /> Groundwater gradient: 0 006
<br /> Remediation system status during
<br /> I groundwater monitoring event: UVB system not operating
<br /> Well screens submerged- IWl, MW13, RW1, RW2, RW4, SWI, SW2, WB-MW1,
<br /> UVB-MW2, V1, V3, V4
<br /> I Well screens not submerged MW1-MW10, V2
<br /> Liquid-phase hydrocarbons: Not observed or detected
<br /> Laboratory: TestAmenca, Inc , Nashville, Tennessee
<br /> •
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