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07 February 2000 <br /> AGE-NC Project No. 95-0144 <br /> Page 4 of 4 <br /> stable or decreased at the site between August and November 1999. <br /> • Hydrocarbon concentrations increased significantly in MW-20A & B and decreased <br /> significantly in MW21A & B. These samples may have been mislabeled or switched; <br /> however no evidence of a switch in the field or laboratory could be identified. If the <br /> concentration changes are actual, it would indicate a sudden migration of contaminants in <br /> ground water at the site. <br /> • MTBE was detected in two of the ten wells sampled at concentrations as high as 1.5 ppb. <br /> Other oxygenates were not detected in the samples collected during the November 1999 <br /> monitoring event. <br /> 5.0. RECOMMENDATIONS <br /> Based upon data obtained during the fourth quarter of 1999 and previous sampling events, AGE <br /> recommends the following: <br /> • The next quarterly monitoring event should be scheduled for February 2000, concurrent with <br /> monitoring at the Van Buren site. In accordance with the revised monitoring schedule, all <br /> wells will be sampled at that time. <br /> • A work plan is currently in preparation for remediation at the former UST No.8 location. <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 mainly <br /> upon analytical results provided by an independent laboratory. Evaluations of the hydrogeologic <br /> conditions at the site have been made from a limited number of available data points (i.e. ground <br /> water monitoring wells), and subsurface conditions may vary through time and with distance from <br /> these data points. No other warranty, expressed or implied, is made as to the professional <br /> recommendations contained in this report. <br /> Advanced GeoEnvironmental,Inc. <br />