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Results <br /> The landfill gas monitoring results from the Harney Lane Sanitary Landfill indicates that no <br /> combustible gas in excess of the regulatory limit is present at 35 of the 36 monitoring probes <br /> (Table 1). There was one detection of combustible gas above the five percent limit during this <br /> monitoring event at monitoring probe 10 deep. <br /> In an effort to increase the quality of the gas (methane concentration) at the blower flare station, <br /> the County had incrementally reduced the amount of vacuum that was applied to the wells over a <br /> two month period prior to the first quarter of 2002. This caused the concentration of methane gas <br /> at GW-10 deep to exceed the 5% regulatory limit. As reported, the methane concentration at this <br /> probe during the first quarter of 2002 was 7.2%. The concentration of methane gas in the soil at <br /> this location as of June 16 had dropped to 5.1 %. Although this is still above the regulatory limit, <br /> it is an indication that the concentration of methane gas contained in the soil at this location, is <br /> decreasing. As a result of this event, the County and SCS Field Services are continuing to <br /> increase the total vacuum applied to all the wells, and to adjust each individual well to assure that <br /> adequate vacuum is applied to the wells in the vicinity of GW-10. This should further reduce and <br /> eventually eliminate the gas currently existing in the soil. <br /> Harney Lane Landfill July 31,2002 <br /> San Joaquin County 2 Quarterly LFG Monitoring <br />