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CAMBRIA <br /> ANTICIPATED FOURTH QUARTER 2003 ACTIVITIES <br /> Groundwater.Monitoring: Blaine will gauge and sample the site wells according to the existing <br /> sampling schedule and tabulate the data. Cambria will prepare a groundwater monitoring report. <br /> Groundwater Remediation:No further remediation activities are scheduled at this time. <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> Groundwater flow direction was to the northeast this quarter, as is typical for the site. Well <br /> MW-1A contained MTBE at a concentration of 310 ltg[L, which remains significantly reduced <br /> from historical MTBE concentrations in this well. Figure 3 indicates that both MTBE mass <br /> removal and MTBE concentration in this well have become asymptotic, suggesting that periodic <br /> GWE is no longer having asignificant remedial effect on this well. Therefore, periodic GWE ` <br /> events have been discontinued. Cambria will continue to monitor MTBE concentrations at.the " <br /> site and will consider re-implementing.periodic GWE events if a significant increase in MTBE <br /> y concentrations in MW-1A is detected. <br /> CLOSING <br /> If you have any questions regarding the contents' of this document, please call Joe Neely at <br /> (707) 933-2361. <br /> Sincerely, <br /> Cambria Environmental Technology, Inc. <br /> Cynthia Vasko <br /> Senior Staff Engineer <br /> D Gfifl�O <br /> W. <br /> Joe W. Neely,RG <br /> Senior Project Geologist <br /> RG 6927 No.6927 <br /> OF CALIFO <br /> 0813 2 <br />