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• • <br /> CONCLUSIONS <br /> The monitoring results show that migration of methane concentrations greater than 5% is present <br /> in only one probe (the deep probe of GW-3). Past quarters have shown gas levels above 5% in <br /> all the wells along the labor camp (GW-1 to GW-3), and in GW-12. Detections below the 5% <br /> limit occurred during the Third Quarter Monitoring Event in these wells and in GW-11. <br /> Representatives from the Environmental Health Division instructed the County to attempt to <br /> resolve the migration problem by balancing the gas system and looking for hindrances which <br /> may cause migration. Steps have been taken to address the exceedence in GW-3 and reduce the <br /> amount of migration in the other wells showing traces of migration. Adjustments are <br /> continuously being made to run the system more efficiently and control gas migration. The <br /> County believes that the current configuration for the has system will properly control migration. <br /> The reduced levels of gas in the probes show that the County is making improvements, and work <br /> is still being done to operate the system most efficiently. <br /> Monitoring will continue with the next monitoring event in October 2000. Further monitoring <br /> will help determine if the gas control system is working efficiently. <br /> N:\Naj ee\Hl\Gas\3rd2000gas.wpd <br /> 5 <br />