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I PIN EWorking to Restore Nature 1710 Main Street OCT 14 1992 Escalon, CA 95320 ENVIRONMENTAL HEALTH Phone (209)838-3507 P��Tf��VIC�� FAX (209)838-3509 October 12, 1992 Mr Michael Infurna San Joaquin County Public Health Services Environmental Health Division P O Box 2009 Stockton, CA 95021 RE Third Quarter 1992, Monitoring and Sampling Report, Reeves Exxon"2360 East St , Tracy, California Dear Mr Infurna 0 This letter reports the results of third quarter 1992, groundwater monitoring and sampling at the referenced site (Figure 1) On September 28, 1992, depth to water data measurements were collected from wells MW1, MW2, and MW3 (Table 1) Groundwater elevation dropped an average of 0 18 feet since last measured in June 1992 Figure 2 depicts the groundwater gradient, which is consistent with June 1992 and December 1991 direction and magnitude Groundwater flows to the northeast at a magnitude of�0 005 feet per foot or 28 feet per mile Monitoring data is included in Attachment 1 After purging a minimum of three casing volumes of groundwater and the stabilization of temperature, pH and EC, samples were collected from each well in accordance with RESNA Industries' Well Monitoring Protocol Samples were analyzed by RESNA Environmental Laboratories (DHS Cert #1211) for benzene, toluene, ethylbenzene, xylenes (BTEX) and total petroleum hydrocarbons as gasoline and diesel (TPHG & D) by EPA methods 8020 and 503018015, respectively Low levels of gasoline hydrocarbons were detected in wells MWI and MW2 Petroleum hydrocarbons as diesel were not detected above method reporting limits in these wells No petroleum hydrocarbon analytes were detected in MW3 Table 2 summarizes analytical data Laboratory data sheets and chain-of-custody documentation are included in Attachment 2 QR101292 MRM