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SEC ® R • Groundwater has been monitored on a quarterly basis since 1990 and sampled at the site on a quarterly or semi-annual basis since April 1993 Floating product or sheen has never been observed in any of the wells Historically, petroleum hydrocarbon concentrations in the groundwater have ranged from not detected to 78,000 parts per billion (ppb) of TPHg (well VW-2), not detected to 28,000 ppb of benzene (well MW-5), and not detected to 4,900 ppb of MtBE (well VW-3) Groundwater data for the third quarter 2001 sampling event on September 12 and 13, 2001 ranged from not detected to 34,000 parts per billion (ppb) of TPHg (well VW-7), not detected to 870 ppb of benzene (well VW-7), and not detected to 310 ppb of MtBE (well VW-4) Historically, depth to groundwater has risen from approximately 51 to 53 feet bgs in 1993 to 30 to 32 feet bgs in September 2001 Groundwater flow has been to the northeast with the hydraulic gradient ranging from 0 002 to 0 013 feet/feet In November 2001 Gettler Ryan install ten ozone wells SP-1 through SP-10 to approximately 65 feet bgs and three ozone wells SP-11 through SP-13 were installed to approximately 40 feet bgs The well were connected to an ozone sparge system and the system was placed into operation on December 19, 2001 The system cycles ozone/air infection between ten sparge points (SP-1 through SP-10) Since the ozone microsparge panel can only supply ten points, wells SP-11 through SP-13 will be for future use The schedule is currently set to cycle through each point 16 times per day, for 5 to 10 minutes per point per cycle Sparge point selection and cycle times will be adjusted as petroleum hydrocarbon concentrations in groundwater change I F RECENT QUARTER ACTIVITIES (Fourth Quarter 2003) • 1 Performed quarterly groundwater monitoring and sampling (TRC) i 2 Prepared and submitted a quarterly summary report N 3 Performed remedial system operation and maintenance NEXT QUARTER ACTIVITIES (First Quarter 2004) 1 Prepare and submit a quarterly summary report 2 Perform quarterly groundwater monitoring and sampling 3 Perform remedial system operation and maintenance CHARACTERIZATION/REMEDIAL STATUS Sod contamination delineated? Yes Dissolved groundwater delineated? Yes Free product delineated? NA Soillgroundwater remediation in progress? Yes Start? 2001 Anticipated completion date? 2005 CONSULTANT- SECOR International Incorporated 3 i d