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i <br /> FOURTH QUARTER,2001 <br /> GROUNDWATER MONITORING REPORT <br /> JAMAR OIL DISTRIBUTION <br /> MAY 2002 <br /> Benzene was detected in all wells at concentrations of 32,000µg/l, 11,000µg11, 20,000 4g11, <br /> 7,800 µg11, and 52µgll in samples from MW-1,MW-2,MW-3,MW-4, and MW-5, respectively <br /> MTBE was detected in samples from MW-1 and MW-4 at 230,000µgll and 6,000,ugll, <br /> respectively <br /> Toluene was detected in samples collected from MW-1 and MW-5 at 5,200 µg/l and 25 /.cg/l, <br /> respectively Ethylbenzene was detected in samples collected from MW-3 and MW-5 at 660 <br /> gg/l and 4µg11, respectively Total xylenes were detected in the sample from MW-5 at 8 6µg/1 <br /> Tertiary butyl alcohol(TBA)was not detected in any of the samples collected from the site <br /> 1,2-DCA,DIPE,ETBE,TAME, and EDB were non-detect in all samples collected and analyzed <br /> this quarter <br /> Groundwater analytical data are summarized in Table 2 and shown on Figure 5 Copies of the <br /> laboratory reports with COC documentation are included to Appendix B <br /> CONCLUSIONS <br /> • Petroleum hydrocarbon and MTBE concentrations have remained relatively consistent over the <br /> last two years However,the extent of impacted groundwater remains undefined at the site <br /> Petroleum hydrocarbons detected in samples from upgradient well MW-5 may be indicative of <br /> + an upgradient source which should be evaluated in more detail The First Quarter Monitoring <br /> Report for 2002 will be submitted by May 17, 2002 <br /> 5 <br />