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21 Au <br /> gust 2004 <br /> AGE-NC Project No. 97-0327 <br /> Page 4 of 5 <br />! ' changes of recharge/discharge of the local ground water couldgreatly modify ground water <br /> flow direction. <br /> j- Concentrations of dissolved TPH-g were just detectable in samples from wells MW-1 and <br />! ' MW-2 in the February 2000 monitoring event and were not detected during the May 2000 <br /> monitoring event indicating shifting of the dissolved TPH-g plume margin. <br /> Minor concentrations of dissolved TPH-d and TBA were detected in samples from wells <br /> MW-1, MW-2 and MW-3 and dissolved MTBE detected from wells MWA and MW-2 <br /> indicating that there is only minor impact to ground water in the area assessed (Figure 4). <br /> j' <br /> • The elevated petroleum hydrocarbon concentrations detected in a grab ground water sample <br /> collected from soil boring P-8 on 21 June 1999 suggest that P-8 may be near the dissolved <br /> petroleum hydrocarbon "core area"of the plume. <br /> 5.0. RECOMMENDATIONS <br /> ' • Based upon data collected from the site in May 2000, AGE recommends: <br /> • Continued quarterly ground water monitoring of wells MWA, MW-2 and MW-3 for the <br /> ' remainder of the year; following four consecutive ground water monitoring events,AGE will <br /> make a recommendation to the PHS-EHD to re-evaluate the ground water monitoring <br /> program, if warranted. The next two ground water monitoring events are tentatively <br /> scheduled for August and November 2000. <br /> Submit one ground water monitoring well sample to a microbiological laboratory for <br /> microbial enumeration and physicochemical analysis to examine natural attenuation of <br /> ' petroleum hydrocarbons in ground water at the site. <br /> • A search for all potential ground water receptors within a 2,000-foot radius of the site. <br /> Installation of one ground water monitoring well downgradient of soil boring P-8 to assess <br /> the elevated petroleum hydrocarbon concentrations detected in P-8 on 21 June 1999; the well <br /> should be installed approximately 60 to 70 feet south-southwest of monitoring well MW-2. <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. Evaluations of the geologic/hydrogeologic <br /> Advanced GeoEnviron _ 1 ' <br /> mental,Ine. <br />