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I 1 26 November 2003 AGE-NC Project No 98-0465 Page 4 of 4 , • TPH-g was detected in samples collected from MW 1 at concentrations of 500 µg/1 Historically, TPH-g has not been detected above laboratory reporting limits in monitoring 'iwells MW 1 through MW4 I • MTBE was detected in samples collected from MW 1 and MW3 at concentrations of 500 ggd and 10 gg/l, respectively The concentrations of MTBE in MW2 dropped to non-detectable W 'I levels this quarter and the concentrations also decreased in MW1 and MW3 The concentration of MTBE in MW1 exceeds the Primary State and Federal established ' maximum containment level (MCL) of 13 gg/1 for MTBE in drinking water • The lateral extent of MTBE impacted ground water has been defined to the northeast of the former UST area, but not toward the west-northwest, east or south V 5.0. =RECOMMENDATIONS ` ' Based on the findings of this investigation, AGE recommends • Continued quarterly momtonng of the ground water monitoring wells The next monitoring ' event will be performed on 15 January 2004 • Preparation of a work plan to delineate the lateral 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 analytical results provided by an independent laboratory, Evaluation of the hydrogeo logic conditions ' at the site for'the purpose of this investigation was made from a limited`number of available of subsurface data points(i e ,monitoring wells and ground water samples) and subsurface conditions may varyaway from these data points No other warranty, expressed or implied, is made as to the , ' professional opinions, interpretations arid recommendations contained in this report ,I f I V , t I I II Advanced CeoEnviranrnental,inc i I