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Ile 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 summarizes recent site <br />' activities This report covers site activities from 12-13 October 2005,the dates of the last monitoring <br /> event, until 22 December 2005, the date 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 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, oxidation pilot test with soil vapor <br /> extraction <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 />' GROUNDWATER MONITORING SUMMARY <br />' Gauging and sampling date 22 December 2005 <br /> Wells gauged and sampled: IW1, MW1-MW5, MW7, MWS, MW10, MW13, RW1, <br />' RW2, RW4, SW 1, SW2,UVB-MW 1, UVB-MW2, V 1-V4 <br /> Wells gauged only: MW6, MW9 <br /> Groundwater flow direction: Northeast <br />' Groundwater gradient: 0 005 <br /> Remediation system statics during <br /> groundwater monitoring event UVB system not operating, oxidation pilot test with soil vapor <br />' extraction (not operating) <br /> Well screens submerged- IW1, MW13, RW1, RW2, RW4, SW1, SW2, UVB-MW1, <br /> UVB-MW2, V1, V3, V4 <br /> Well screens not submerged: MWI-MW10, V2 <br /> Liquid-phase hydrocarbons. Not observed or detected <br /> Laboratory: Sequoia Analytical/TestAmenca,Inc ,Morgan Hill,California <br /> • <br /> t9 1proJe ts173942Vn=ct Awp\q l205\3942tcxt doe 1 <br />