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a Environmental <br /> Mr HarIuz Knoll <br /> 21 September 1999 Resources <br /> • Page 2 Management <br /> The concentration of compounds m MW4 (located immediately <br /> downgradient of the former UST) has shown a decrease during the <br /> September sampling event, and are similar to concentrations prior to <br /> ORC injection (April) Samples collected from MW-3 (located <br /> upgradient of the former tank location) continue to show no detectable <br /> concentrations of compounds <br /> UST 2 <br /> Ground water sampling results for wells surrounding former UST 2 are <br /> presented in Table 2 As showri, the concentration of TPH-g and BTEX <br /> compounds in the downgradzent wells (MW-2 and MW-6) are less than <br /> the concentrations detected prior to ORC injection Specifically at MW-2, <br /> the concentrations continued to decrease during both the June and <br /> September 1999 sampling events At this location, all compounds except <br /> TPH-g and ethylbenzene have decreased to non-detectable levels <br /> At MW-6, the concentrations of TPH-g and BTEX detected during the <br /> September sampling event are similar to those detected during the June <br /> sampling event but are less than those detected prior to ORC injection <br /> (April) As with previous sampling results, the sample collected from <br /> MW-5 (located upgradxent of the former tank location) contained no <br /> detectable concentrations of compounds . <br /> In accordance with Investigation Results Report (ERM, May 1999), ERM <br /> will be performing the third round of post ORC ground water sampling <br /> at the site in early November to further evaluate the concentration of <br /> chemicals in ground water <br /> If you have any questions regarding the sampling results, please call me <br /> at (925) 946-0455 <br /> Sincerely, <br /> I/� ryry" J <br /> Matthew L Brandy <br />. Project Manager <br /> MLB/m1b/3374 60 <br />