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` a ' CP GROUND ZERO ANALYSIS, INC. 1714 Main Street 4. Escalon, Cahforma 95320-1927 Telephone (209)838-9888 Facsimile (209)838-9883 April 5, 2002 Mr Michael Infurna San Joaquin County Department of Environmental Health 304 East Weber Avenue, Third Floor Stockton, CA 95202 Subject Confirmation Sampling and Request for Case Closure Former Reeve's Exxon, 2360 East Street, Tracy, California Dear Mr Infurna This letter report summarizes the results of confirmation groundwater sampling conducted at the subject site on behalf of the John Pestana QTIP Trust A map showing the site location is presented on Figure 1 i Site activities consisted of measuring depth to water, purging all site wells, and collecting groundwater samples from all site wells The groundwater samples were analyzed for benzene, toluene, ethylbenzene xylenes (BTEX), total petroleum hydrocarbons as gasoline (TPHg), 1,2- dichloroethane (1,2-DCA), ethylene dibromide (EDB), gasoline oxygenate additives [methyl- tert-butyl ether (MTBE), ethyl-tert-butyl ether (ETBE), di-isopropyl ether (DIPE), tert-amyl methyl ether (TAME), tert-butyl alcohol (TBA), methanol and ethanol] and lead SITE ACTIVITIES Groundwater Monitoring and Sampling Groundwater monitoring and sampling was conducted on February 5, 2002 The depth to groundwater in site wells ranged from 6 42 to 7 15 feet below grade Groundwater flow beneath the site was toward the northeast at a gradient of approximately 0 006 ft/ft A groundwater gradient map for February 5, 2002 is presented on Figure 2 Groundwater monitoring data are summarized in Table 1 At least three well casing volumes of water were purged from wells MWI, MW2, and MW3 prior to sampling All purge water was contained in properly labeled 55-gallon drums Field • purge logs are included in Attachment A Groundwater samples were submitted to Argon G\Data\GROUNDZE\PESTANA\PESTANA 036\REP0RTS\c1osure02 doc