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i 11 August 2003 i AGE-NC Project No 96-0232 Page 15 of 15 ' site's UST primary product lines and the UST sump not passing the annual `Lane and Leak Detector' test In January 2003 As a result of the `leaking lines', the Flag City Chevron upgraded the entire UST system (I a replacement of fuel dispensers and pans, product piping, secondary containment piping and UST sumps) during May 2003 Since then, the MTBE dissolved plume appears to have stabilized, MTBE concentrations In extraction well samples have showed steady declines since the peak In March 2003 i 6.0 RECOMMENDATIONS Based upon data collected from the site, AGE recommends • Continued quarterly ground water monitoring and sampling of monitoring wells MW-1 through MW-18 • Continued coordinated quarterly ground water monitoring and sampling events with Three B's Truck Plaza • Continued ground water extraction from wells EW-4 and EW-5, extraction wells EW-7, EW-8, EW-9 and EW-10 should be alternated Into the ground water extraction system • Additional Geoprobe soil borings for collection of grab ground water samples may be warranted between P-37 and MW-4,west and south of P-37 and north of P-38 to fully assess the extent of impacted ground water 7.0. 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 mainly upon analytical results provided by an independent laboratory Evaluations of the hydrogeologlc conditions at the site for the purpose of this Investigation are made from a limited number of available data points(ground water samples), and subsurface conditions may vary away from these data points No other warranty,expressed or Implied,is made as to the professional interpretations, opinions and recommendations contained in this report Advanced GeoEnviranmental,Inc