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Environmental <br /> Mr Harlin Knoll Resources <br /> 15 December 2004 Management j <br /> Page 2 <br />' prior detected concentrations Ground water concentration trends <br /> within MW-1 and MW-4 are shown in Figures 3 and 4 <br /> Former Tank 2 Location <br /> As shown on Figure 2, no detectable concentrations of hydrocarbons were <br /> observed within monitoring wells MW-5, and MW-8 TPH and BTEX have <br /> been nondetectable in MW-2 since 2001, however, the sample collected from <br /> MW-2 during the 2004 sampling event contained ethylbenzene at a <br /> concentration of 12 µg/L and total xylenes at 8 7 gg/L These detections <br /> may be attributed to seasonal changes in the water level within the MW-2 <br />' Monitoring well MW-6, Iocated adjacent to the former fuel tank pit, <br /> contained hydrocarbon concentrations that are an order of magnitude lower <br />' than previous data Ground water concentration trends within MW-2 and <br /> MW-6 are shown in Figures 5 and 6, respectively <br />' CONCLUSIONS <br />�f The results of the most recent ground water sampling event indicate that <br /> the sampled parameters in all wells have shown progressive decreases or <br /> stabilization Four of the eight wells (MW-3, MW-7, MW-5, and MW-8) <br /> continue to record non-detect results over the last several sampling events <br /> We propose to reduce the ground water monitoring program by <br /> elirrunatmg these non-detectable wells from the annual ground water <br /> monitoring program We propose to continue monitoring the remaining <br /> wells (MW-1, MW-2, MW-4, and MW-6) on an annual basis until <br /> fregulatory closure is granted <br />' If you have any questions, please call me at (925) 946-0455 <br /> Sincerely, <br />' Brian S Bjorklund, R G <br /> Pro]ect Manager <br />' cc Mr Scott M Krall, Heinz - Pittsburgh, PA <br /> Mr Marty Hartzel, CVRWCB <br /> Ms Margaret Lagorio, SJCEHD <br /> Mr James F Davenport, The Cranbrook Group <br />