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• Mr Kyle Christie Project 0805-140 02 <br /> July 28, 1995 <br /> Page 3 <br /> of approximately 0 003 (see Figure 3) The direction of groundwater flow is consistent <br /> with previous sampling events Groundwater elevations increased approximately 1 83 feet <br /> from the previous sampling event (February 1995) <br /> Groundwater samples from each well were analyzed for TPHG and BTEX using <br /> Environmental Protection Agency Methods 5030/DHS/LUFT and 5030/8020, <br /> respectively The samples were analyzed at Columbia Analytical Services, Inc , in San <br /> Jose, Cahforrua The results of these analyses are summarized in Table 1 Copies of the <br /> chain-of-custody records and laboratory analysis reports are presented in Attachment B <br /> Results of analyses indicated TPHG was detected in groundwater samples collected from <br /> wells MW-1, MW-3, and MW-5 at concentrations of 84 parts per billion (ppb), 100 ppb, <br /> and 5,000 ppb, respectively Benzene was detected at a concentration of 4 7 ppb in well <br /> MW-1 and 560 ppb in well MW-5 TPHG and BTEX were not detected in wells MW-2, <br /> MW-4, or MW-6 Concentrations of TPHG and benzene are shown on Figure 2 <br /> . ACTIVITIES PERFORMED DURING THE SECOND QUARTER <br /> o Performed quarterly groundwater sampling <br /> • Compiled and evaluated groundwater monitoring data <br /> ANTICIPATED WORK <br /> • ARCO will continue quarterly groundwater monitoring The next sampling event <br /> is tentatively scheduled for August 1995 <br /> CONCLUSIONS <br /> The groundwater flow direction has been consistently toward the east-southeast Dissolved <br /> gasoline hydrocarbons were detected in groundwater samples collected from monitoring wells <br /> MW-1, MW-3, and MW-5 but were not detected in wells MW-2, MW-4, and MW-6 <br /> Although TPHG was detected in the sample collected from well MW-3, the laboratory <br /> indicates the result contains discrete compounds quantified as gasoline, and the chromatogram <br /> does not match the typical gasoline fingerprint Dissolved hydrocarbon concentrations <br /> generally were consistent with previous sampling events <br /> • <br /> SA"\PJ"805�0805I400 2BS-94\pas 4 <br />