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Mr Kyle Christie Project 0805-140 02 <br /> November 22, 1995 <br /> Page 3 <br /> consistent with previous sampling events Groundwater elevations decreased <br /> approximately 156 feet from the previous sampling event(May 1995) <br /> Groundwater samples from each well were analyzed for TPHG and BTEX using <br /> Environmental Protection Agency Methods 5030/DHS/LUFT and 503018020, <br /> respectively The samples were analyzed at Columbia Analytical Services, Inc , in San <br /> Jose, California. 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 Appendix B <br /> Results of analyses indicated TPHG was detected in groundwater samples collected from <br /> wells MW-1 and MW-5 at concentrations of 190 parts per billion (ppb) and 5,700 ppb, <br /> respectively Benzene was detected at a concentration of 8 0 ppb in well MW-1 and <br /> 410 ppb in well MW-5 TPHG and BTEX were below laboratory detection limits in wells <br /> MW-2, MW-3, MW-4, and MW-6 Concentrations of TPHG and benzene are shown on <br /> Figure 2 <br /> ACTIVITIES PERFORMED DURING THE THIRD QUARTER <br /> • Performed quarterly groundwater sampling <br /> • Compiled and evaluated groundwater monitoring data <br /> • Began preparation of an Interim Sod Remediation Plan and Well Installation <br /> Workplan associated with the removal and replacement of the underground <br /> storage tanks and product delivery lines <br /> ANTICIPATED WORK <br /> • ARCO will continue quarterly groundwater monitoring The next sampling event <br /> is tentatively scheduled for December 1995 <br /> • EMCON will finalize and submit the Interim Soil Remediation Plan and Well <br /> Installation Workplan <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 and MW-5 but were not detected in wells MW-2, MW-3, MW-4, or MW-6 Dissolved <br /> hydrocarbon concentrations generally were consistent with previous sampling events <br /> SAON 1PJ010805V0805I400 2FS-941drw 2 <br />