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' 02 February 2004 <br /> AGE-NC Project No 99-0624 <br />' Page 8 of 8 <br />' 9 Utilizing EPA Method 8260B,MTBE was detected from wells MW-1, MW-2, MW-3 and <br /> MW-7 at concentrations as high as 7,500 µg/l (MW-2) The MTBE concentrations were <br /> above the Primary MCL of 13 gg/l in drinking water <br />' The detection of MTBE (16 gg/1) in the ground water sample collected from well MW-7 <br /> Indicates that the vertical extent of MTBE-impacted ground water has not been defined <br />' a The lateral extent of MTBE-Impacted ground water has not been defined to the east and <br /> south of the UST area An Iso-concentration map depicting the approximate distribution of <br /> dissolved MTBE is presented in Figure 8 <br />' & The elevated concentrations of petroleum hydrocarbons detected in samples collected from <br /> well MW-2 Indicate that this well is within or near the dissolved petroleum hydrocarbon <br /> "core area" of the on-site plume <br /> 5.0. RECOMMENDATIONS <br /> • Based on the findings of this Investigation, AGE recommends <br /> • Continuation of the quarterly ground water monitoring program The next monitoring event <br />' was performed in December 2003 <br /> • Installation of the proposed off-site ground water monitoring well, that could not be <br /> completed during the July 2003 drilling activities, to assess the lateral extent of <br /> IMTBE-impacted ground water <br /> • Performance of a receptor survey to locate potential receptors within 2,000 feet of the site <br /> • Preparation of a feasibility studies report to evaluate soil and ground water remediation <br /> alternatives at the site <br /> I <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 /> analytical results provided by an independent laboratory Evaluation of the geologic/hydrogeologic <br /> conditions at the site for the purpose of this investigation was made from a limited number of <br /> available data points (ie soil and ground water samples) and subsurface conditions may vary away <br /> 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 CeoEnvironmental,Inc <br />