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CONCLUSIONS <br /> The monitoring results show for the first time that all probes are withing regulatory limits. <br /> The probes are monitored in accordance with Waste Board protocol of purging one probe <br /> volume prior to taking a reading. The County has calculated the volume of gas that <br /> constitutes a probe volume for each probe. A time has been calculated for each probe <br /> using the manufacturers' pump rate information for the GEM 500. Once the time has <br /> been reached indicating that one probe volume has been purged, a reading is taken if the <br /> levels are constant. If the levels are changing at the end of the purge, a reading is not <br /> taken until the levels have stabilized. All probes showed either zero or negative static <br /> pressure this quarter which would seem to indicate that gas is being pulled away from <br /> those probes. <br /> Monitoring will continue with the next monitoring event in January 1999. Further <br /> monitoring will help determine if the results from this quarter are anomalous or if they <br /> are,truly an indication that perimeter gas concentrations are under control. <br /> S:\WES\HL\GAS\4THQU98G.REP <br /> 4 <br />