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I F 16 February 2405 • AGE-NC Project-No 98-0465 ' Page 4 of 4 ' detected above'laboratory reporting limits in monitoring wells MW-2 through MW-4 The ' appearance of TPH-g at the same or similar concentrations of MTBE indicates that the reported concentration of TPH-g is actually an isolated MTBE peak,which falls within the same carbon range _ • MTBE was detected in samples collected from MW-1 and MW-3 at concentrations of j 770 µg/1 and 14 µg11, respectively The concentration of MTBE in MW-1 exceeds the Primary State and Federal established maximum containment level (MCL) of 13 µg11 for MTBE in drinking water ' The lateral extent of MTBE-impacted ground water has been defined to the northeast of the r former UST area, but not toward the west-northwest, east, or south ' NDATI 5.0. RECOMMENDATIONS O Based on the findings recounted in this report, AGE recommends • Continued quarterly monitoring of the ground water monitoring wells The next monitoring event was performed in January 2005 • , Preparation of a work plan to delineate the lateral an vertical extent of MTBE-impacted ground water at the site ' 6.0. -LIMITATIONS Our professional services were performed using that degree of care and skill ordinarily exercised by ' environmental consultants practicing in this or similar localities The findings were based upon field measurements and analytical results provided by an independent laboratory Evaluation of the ' hydrogeologic conditions at the site for the purpose of this investigation are made from a limited number of available data points (i a ground water samples), and subsurface conditions may vary away from these data points No other warranty,expressed or implied,is made as to the professional ' interpretations, opinions, and recommendations contained in this report Advanced GeoEnvironmental,Inc