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ADDITIONAL ACTIVITIES PERFORMED AT SITE <br />' No additional activities were performed at the site <br /> tWORK PROPOSED FOR NEXT QUARTER <br />' Groundwater will be monitored in accordance with the attached groundwater monitoring plan <br /> ETIC Engineering,Inc is currently assessing the potential migration of petroleum hydrocarbons and <br />' MTBE from offsite sources onto this site ExxonMobil installed well MW7 in 1994 in a location <br /> which is upgradient of onsite source areas and approximately 60 feet downgradient of the <br /> neighboring 7-Eleven facility No 14117 Well MW7 did not contain detectable concentrations of <br />' hydrocarbons until August 2000, when MTBE was first detected MTBE has been detected in well <br /> MW7 at concentrations as high as 260 micrograms per liter (µg/L) Tertiary butyl alcohol (TBA) <br /> was detected in well MW7 at a concentration of 2,370 Ag/L during this most recent sampling event, <br />' which is more than six years after Exxon transferred the property to New West Petroleum MTBE <br /> and TBA have been detected at concentrations of up to 36,000 and 98,000µg1L,respectively, at the <br /> upgradient 7-Eleven facility This data suggests that the source area for the MTBE and TBA <br />' detected in MW7 is offsite <br />' Attachments <br /> Figure 1 Site Plan Showing Groundwater Elevations and Analytical Results <br /> Table 1 Well Construction Details <br /> Table 2 Groundwater Monitoring Data <br /> Table 3 Groundwater Monitoring Plan <br /> Appendix A Field Protocols <br /> Appendix B Field Documents <br /> Appendix C Laboratory Analytical Reports <br />' g Vmr-cca17370SVnutcAwp\gU9p2\3708iexc doc 2 <br />