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• Mr Kyle Christie April 27, 1995 Page 3 Results of analyses indicated TPHG was detected in groundwater samples collected from wells MW-1, MW-3, and MW-5 at a concentration of 59 parts per billion (ppb), 84 ppb, and 6,700 ppb, respectively Benzene was detected at a concentration of 2 1 ppb in well MW-1 and 420 ppb in well MW-5, and ethylbenzene was detected at a concentration of 0 5 ppb in well MW-2 TPHG and BTEX were not detected in wells MW-4 and MW-6 Concentrations of TPHG and benzene are shown on Figure 2 ACTIVITIES PERFORMED DURING THE FIRST QUARTER • On February 14, 1995, EMCON submitted a letter to the SJCPHS The letter addressed comments from the SJCPHS regarding the Site Comparison Report for ARCO Service Station Nos 548 and 760 (225 South Cherokee Lane in Lodi, California) • Performed quarterly groundwater sampling ANTICIPATED WORK o ARCO will continue quarterly groundwater monitoring The next sampling event is tentatively scheduled for May 1995 CONCLUSIONS The groundwater flow direction has been consistently toward the east-southeast Dissolved gasoline hydrocarbons were detected in groundwater samples collected from monitoring wells MW-1, MW-2, MW-3 and MW-5 but were not detected in wells MW-4 and MW-6 The detected concentration may be due to laboratory error Although TPHG was detected in the sample collected from well MW-3, the laboratory indicates the result contains a lower boiling point hydrocarbon mixture quantified as gasoline, and the chrotnatogram does not match the typical gasoline fingerprint Dissolved hydrocarbon concentrations generally were consistent with previous sampling events, with the exception of the previously noted analytical results DOCUMENT DISTRIBUTION Ms Mary Meays San Joaquin County Public Health Services Environmental Health Division P O Box 2009 Stockton, California 95201 3AON IPJ010805108051400 2AL-945dn5 1