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' 30 July 2002 <br /> • AGE-NC Project No 99-0624 <br />' Page 4of5 <br /> in TPH-g concentrations has been observed for three consecutive quarterly sampling events <br />' • Various BTEX compounds were detected in the water samples collected from MW-2 and <br /> MW-3, the MW-2 sample had the highest concentrations <br /> Utilizing EPA Method 8260M, MTBE was detected from MW-1, MW-2 and MW-3 at <br /> concentrations as high as 11,000 ug/l (MW-2), a significant Increase in MTBE <br /> concentrations has been observed for three consecutive quarterly sampling events <br />' 0 The elevated concentrations of petroleum hydrocarbons detected in samples collected from <br /> wells MW-2 Indicate this well is within or near the dissolved petroleum hydrocarbon "core <br />' area" of the plume (Figure 4) <br /> • During nine consecutive quarterly ground water monitoring events, TPH-g has generally <br />' fluctuated from MW-2 at concentrations between 140µg11 and 8,900gg/I,significant MTBE <br /> concentrations have fluctuated between 130 ,ug/1 and 14,000 µg/1 The significant <br /> fluctuations in MTBE-impacted ground water combined with the laboratory notations that <br />' all MW-2 sample chromatograms have contained significant unmodified or weakly modified <br /> gasoline could be Interpreted as a relatively new release <br />' <br /> 5.0. RECOMMENDATIONS <br />' Based upon data collected during March 2002, AGE recommends <br /> 0 Utilization of wells MW-1 through MW-4 for quarterly ground water monitoring and <br /> sampling <br /> • Performance of a receptor survey to locate potential receptors within 2,000 feet of the site <br /> • Preparation of a monitoring well installation work plan to assess petroleum-impacted ground <br /> water near the product lines and current fuel dispensing area and downgradient of MW-2 <br /> • Preparation of a feasibility studies report to evaluate soil and ground water remediation <br /> alternatives at the site <br /> 6.0. LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing in this or similar localities The findings were based upon <br /> Ianalytical results provided by an Independent laboratory Evaluations of the hydrogeologic <br /> • <br /> Advanced GeoEnviron mental,Inc <br />