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CORRAL HOLLOW SANITARY LANDFILL LFG MIGRATION MONITORING <br /> Landfill Location <br /> The Corral Hollow Sanitary Landfill is located on Corral Hollow Road, approximately five miles <br /> south of Tracy, California(Figure 1). The site is a Class III landfill which stopped accepting <br /> waste in May 1995. <br /> Monitoring System and Equipment <br /> In accordance with closure regulations, a network of seven perimeter gas monitoring wells was <br /> installed in 1995 (Figure 2). <br /> The seven wells were monitored for methane on September 5, 2002, by SCS Field Services. <br /> SCS used a Landtec GEM 500 Gas Extraction Monitoring Instrument which was calibrated prior <br /> to sampling. The Landtec GEM 500 is capable of measuring methane, carbon dioxide, oxygen, <br /> and nitrogen (balance gas) concentrations. <br /> Results <br /> The landfill gas monitoring results from the Corral Hollow Sanitary Landfill indicates that no <br /> combustible gas in excess of the regulatory limit is present at 19 of the 20 monitoring probes <br /> (Table 1). <br /> Probe GW-6-deep contained levels of combustible gas which exceed the regulatory limit during <br /> this monitoring period. However, combustible gas concentrations at 6-deep shows continuing <br /> decreases over the last year(Figure 3). Recent measurements taken on October 3 found the <br /> combustible gas concentrations at this probe to be 0.8%. <br /> During the second quarter 2002, the methane content at GW-6-intermediate had increased to <br /> Corral Hollow Landfill October 1,2002 <br /> San Joaquin County 2 Quarterly LFG Monitoring <br />