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' 24 June 2002 AGE-NC Project No 99-0624 ' Page 4of5 highest concentration was detected in the sample collected from MW-2 at 160 4g/l, a ' significant decline from the high of 8,900,ug/l detected in May 2000 • Various BTEX compounds were detected in the water samples collected from MW-1,MW-2 and MW-3, the MW-2 sample had the highest concentrations • Utilizing EPA Method 8260M, MTBE was detected from MW-1, MW-2 and MW-3 at concentrations as high as 2,700 µg/l in ground water samples from MW-1, MW-2 and ' MW-3 • The elevated concentrations of petroleum hydrocarbons detected in samples collected from ' wells MW-2 indicate this well is within or near the dissolved petroleum hydrocarbon "core area" of the plume(Figure 4) • During eight consecutive quarterly ground water monitoring events, decreasing TPH-g and BTEX constituents have generally been reported in water samples collected from MW-2, conversely, significant MTBE concentrations have fluctuated between 880 µg/1 and 14,000 µg/1 The decreasing TPH-gBTEX constituents could be suggestive of a south-southwest shift in the plume However, the significant fluctuations in MTBE-impacted ground water combined with the laboratory notations that all MW-2 sample chromatograms have contained I • significant unmodified or weakly modified gasoline could be interpreted as a relatively new release 5.0. RECOMMENDATIONS Based upon data collected during December 2001, AGE recommends • Continued utilization of wells MW-1 through MW-4 for quarterly ground water monitoring and sampling • Performance of a receptor survey to locate potential receptors within 2,000 feet of the site • Preparation of a feasibility studies work plan to evaluate soil and ground water remediation alternatives at the site • Preparation of a monitoring well installation work plan to assess petroleum-impacted ground water near the product lines and current fuel dispensing area and downgradient of MW-2 IAdvanced CeoEnvnronmental,Inc I