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1` i CAMBRIA Groundwater Remediation System Operation: Cambria installed a GWE system at this site which began operation in March 2000 and was shut down in July 2001. Hydrocarbon and MTBE concentrations have been substantially reduced in wells at the site. The GWE system extracted groundwater from well EW-1 at approximately five gallons per minute. An estimate of contaminant mass removed by the GWE system is summarized in the following table. MASS REMOVAL BY GROUNDWATER EXTRACTION Constituent Total Removed Total Hydrocarbons 1.8 pounds MTBE 15.2 pounds Water 2,295,500 gallons ANTICIPATED FIRST QUARTER 2004 ACTIVITIES Blaine will gauge and sample the site wells according to the existing sampling schedule and tabulate the data. Cambria will prepare a groundwater monitoring report. Groundwater samples will be collected monthly from well MW-6A and these data will be reported via facsimile as we receive them from the lab. CONCLUSIONS AND RECOMMENDATIONS Groundwater analytical data from all of the wells at this site continue to show a declining or stable trend. Sporadic low level detections of MTBE in well MW-6A prompted a monthly sampling schedule for this well beginning in September 2002. Monthly groundwater analytical data from samples collected on August 21, September 24, and October 30, 2003 are included in m this monitoring report. MTBE was not detected in MW-6A between &v 2002 and J i May 2003, or most recently in September and October 2003. Low levels of MTBE were detected during the June,July,and August 2003 sampling events. VM I$r" The lab reported total petroleum hydrocarbons as gasoline (TPHg) in groundwater samples from MW-5A and EW-2 at concentrations of 51 and 250 parts per billion, respectively. However, the lab indicated these TPHg detections did not match their gasoline standard. Therefore, these findings may be anomalous. 0324 2