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' 21 February 2005 <br /> • AGE-NC Project No 99-0624 <br /> Page 4 of 4 <br /> • TPH-g was detected in ground water samples collected from wells MW-1 through MW-3, <br />' MW-5 and MW-7 at a maximum concentration of 43,000µg/1 (MW-2) The appearance of <br /> TPH-g at the same or similar concentrations of MTBE indicates that the reported <br /> concentration of TPH-g is actually an isolated MTBE peak, which falls within the same ; <br />' carbon range <br /> • The fuel additive MTBE was detected in samples from wells MW-1 through MW-3, MW-5 <br />' and MW-7 at a maximum concentration of 43,000µg/l(MW-2) MTBE concentrations have <br /> been increasing in site monitoring wells since late 2001/early 2002 <br />' Benzene was only detected in the samples collected from well MW-2 at a concentration of <br /> 10 µg/1 <br /> • The concentrations of benzene and MTBE-are above their respective, DHS-established <br /> Maximum Contaminant Levels in drinking water <br />' 5.0. RECOMMENDATIONS <br /> 1• Based on the findings of this investigation,AGE recommends continuation of the quarterly ground <br /> water monitoring program The next monitoring event is scheduled for February 2005 <br /> The EHD has requested, in a letter dated 13 October 2004, additional site assessment to define the <br /> extent of MTBE contamination,and interim remedial action to prevent additional off-site migration <br /> of the MTBE-impacted groundwater plume AGE is preparing Revised Site Assessment Work Plan, <br /> to be submitted by the 28 February 2005 <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 hydrogeologic conditions <br />' at the site for the purpose of this investigation was made from a limited number of available data <br /> points(ie ground water samples) and subsurface conditions may vary away from these data points <br /> No other warranty,expressed or implied,is made as to the professional interpretations,opinions and <br />' recommendations contained in this report <br /> • <br />' Advanced GeoEnvironmental,Inc <br />