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, <br /> 15 June 2004 T <br />' AGE-NC Project No 98-0465 <br /> . Page 4 of 4 <br /> � s <br />' The appearance of TPH at the same or similar concentrations ofMTBE indicates the reported <br /> concentration of TPH is actually MTBE which falls within the same carbon range <br />' u MTBE was detected in samples collected from MW 1 and MW3 at concentrations of 390 µg/1 <br /> ` and 9 8 gg/l, respectively The concentration of MTBE in MW1 exceeds the Primary State <br /> and Federal established maximum containment level' (MCL) of 13 µg11 for MTBE in <br /> drinking water <br /> • The lateral extent of MTBE-impacted ground water has been defined to the northeast of the <br />' former UST area, but not toward the west-northwest, east or south <br />' 5.0 RECOMMENDATIONS <br /> Based on the findings of this Investigation, AGE recommends <br />' 0 Continued quarterly monitoring of the ground water monitoring wells The next monitoring <br /> event will be performed on 15 July 2004 <br />' 0 Preparation of a work plan to delineate the lateral extent of MTBE-impacted ground water <br /> at the site <br /> , <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 ofthe hydrogeologic conditions <br /> at,the site for the purpose of this Investigation'was made from a limited number of available <br /> subsurface data points(I e ,monitoring wells and ground water samples) and subsurface conditions <br />' may vary away from these data,points No other warranty, expressed or implied, is made as to the <br /> professional opinions, interpretations and recommendations contained in this report <br /> , <br /> 1 <br /> t <br /> iAdvanced GeoEnvironmental,Inc <br />