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CONCLUSIONS <br /> The monitoring results show that migration of methane concentrations greater than 5% is present <br /> in only one of the probes (the intermediate probe of GW-2). Past quarters have shown gas levels <br /> above 5%in all the wells along the labor camp (GW-1 to GW-3), and in GW-12, and this quarter <br /> while some levels of gas were detected at these wells, along with GW-11, they were lower than <br /> the 5% limit. The flare system experienced a flame failure on Friday, June 23, 2000, at <br /> approximately 2300. As a result, the system was down all weekend and vacuum was not applied <br /> to the site. This extended period of down time may have allowed abnormal amounts of methane <br /> to migrate into the outlying wells. The system was restarted at approximately 0900 on Monday, <br /> June 26, 2000, approximately one hour prior to the monitoring event. The extended period of <br /> inactivity of the gas system and the short period of operation prior to monitoring may have <br /> affected the concentrations of methane and therefore led to the exceedence of the 5% limit in <br /> GW-2. <br /> The County has made modifications to the gas system that has allowed for more vacuum to be <br /> available to the north half of the site. Adjustments are continuously being made to run the <br /> system more efficiently and to control gas migration. The reduced levels of gas in the probes <br /> show that the County is making improvements, and work is still being done to operate the system <br /> most efficiently. <br /> Monitoring will continue with the next monitoring event in August 2000. Further monitoring <br /> will help determine if the gas control system is working efficiently. <br /> N:\Najee\HI\Gas\2nd2OOOgas.wpd <br /> 5 <br />