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02 November 2004 <br /> • AGE-NC Project No 98-0465 <br />' Page 4of4 <br /> • TPH-g was detected in ground water samples collected from MW-1 at a concentration of <br />' 700 µg11, for the fifth consecutive monitoring event Historically, TPH-g has not been <br /> detected above laboratory reporting limits in monitoring wells MW-2 through MW-4 The <br /> appearance of TPH-g at the same or similar concentrations of MTBE indicates that the ry <br />' reported concentration of TPH-g Is actually an isolated MTBE peak, which falls within the <br /> same carbon range <br />' 0 MTBE was detected in samples collected from MW-1 and MW-3 at concentrations of <br /> 650 µg/1 and 7 7 gg/l, respectively The concentration of MTBE in MW-1 exceeds the <br /> Primary State and Federal established maximum containment level (MCL) of 13 µg/l for <br />' MTBE in drinking water <br /> • The lateral extent of MTBE-Impacted ground water has been defined to the northeast of the <br /> 1 former UST area, but not toward the west-northwest, east, or south <br /> 5.0. RECOMMENDATIONS- <br /> Based <br /> ECOMMENDATIONS_Based on the findings recounted in this report, AGE recommends <br /> • Continued quarterly monitoring of the ground water monitoring wells The next monitoring <br />' event should be performed in October 2004 <br /> • Preparation of a work plan to delineate the lateral extent of MTBE-Impacted ground water <br /> at the site <br /> 6.0 LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> tenvironmental consultants practicing in this or similar localities The findings were based upon field <br /> measurements and analytical results provided by an Independent laboratory Evaluation of the <br /> hydrogeologic conditions at the site for the purpose of this Investigation are made from a limited <br /> number of available data points (i e ground water samples), and subsurface conditions may vary <br /> away from these data points No other warranty,expressed or implied,is made as to the professional <br />' interpretations, opinions, and recommendations contained in this report <br /> Advanced GeoFmironmental,Inc <br />