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n <br /> 15 May 2002 <br /> AGE-NC Project No 95-0109 <br /> Page 4 of 5 <br /> • Hydrocarbon concentrations in ground water remained relatively stable in the samples <br /> collected from wells MW-1,MW-4,MW-5,MW-8,MW-9 and MW-14 and remained below <br /> laboratory detection limits in samples collected from MW-2, MW-6, MW-7, MW-10, <br /> MW-11, MW-12 and MW-13 compared to results of the previous sampling event <br /> • 1,2-DCA was detected in water samples from wells MW-1, MW-3, MW-4, MW-5, MW-8 <br /> and MW-9 at concentrations as high as 44 µg11 (MW-5) 1,2-DCA was not detected in the <br /> water sample collected from MW-12 for the second consecutive quarter Other fuel additives <br /> were not detected at the site <br /> • Concentrations of contaminants at the site appeared consistent over the past four quarters of <br /> sampling,with the exception of 1,2-DCA concentrations in MW-12 1,2-DCA was detected <br /> at low concentrations of 3 4 µg11 and 2 6 µg/1 in well MW-12 during the second and third <br /> quarters of 2001, respectively 1,2-DCA concentrations in well MW-12 have been below <br /> laboratory detection limits during the fourth quarter 2001 and the first quarter 2002 sampling <br /> events <br /> • The extent of petroleum hydrocarbon-impacted ground water appears to be contained within <br /> the current well network on-and off-site The extent of 1,2-DCA impacted ground water also <br /> appears to be contained within the current well network <br /> 5.0 RECOMMENDATIONS <br /> Based upon data collected from the site, AGE recommends <br /> • Continued quarterly ground water monitoring as required by Clean-up and Abatement Order <br /> No 93-701 The next ground water monitoring event will be scheduled for June 2002 <br /> • Preparation of a work plan for the installation of monitoring wells to confirm TPH-g- and <br /> BTEX-impacted ground water encountered during the December 2001 ground water <br /> investigation <br /> • <br /> Advanced GeoEnvironmental,Inc <br />