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• Mr Kyle Christie Project 0805-140.02 <br /> January 24, 1996 <br /> Page 3 <br /> consistent with previous sampling events Groundwater elevations increased <br /> approximately 136 feet from the previous sampling event (August 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, 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 78 parts per billion (ppb) and 1,200 ppb, <br /> respectively Benzene was detected at a concentration of 2 3 ppb in well MW-1 and <br /> 55 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 FOURTH QUARTER <br /> a EMCON performed quarterly groundwater sampling <br /> • EMCON compiled and evaluated groundwater monitoring data <br /> • EMCON finalized and submitted the "interim Soil Remediation Plan and Well <br /> Installation Workplan" to the regulatory agencies <br /> • EMCON prepared and submitted an access agreement to the property owner <br /> south of the site (Lincoln Properties) The access letter was submitted on <br /> November 28, 1995 <br /> ANTICIPATED WORK <br /> • ARCO will continue quarterly groundwater monitoring The next sampling event <br /> is tentatively scheduled for March 1996 <br /> CONCLUSIONS <br /> • The groundwater flow direction has been consistently toward the east. Dissolved gasoline <br /> hydrocarbons were detected in groundwater samples collected from monitoring wells MW-1 <br /> and MW-5 but were not detected in wells MW-2, MW-3, MW-4, or MW-6. Dissolved <br /> hydrocarbon concentrations were generally consistent with previous sampling events <br /> SAGA WOMOM8051400 2DS-9&wpt 1 <br />