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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. In accordance with closure regulations, a network of seven perimeter gas <br /> monitoring wells was installed by SCS Engineers (Figure 2). <br /> Monitoring System and Equipment <br /> The seven wells were monitored for methane on June 17, 2002,by SCS Field Services. SCS <br /> used a Landtec GEM 500 Gas Extraction Monitoring Instrument which was calibrated prior to <br /> the sampling event. The Landtec GEM 500 is capable of measuring methane, carbon dioxide, <br /> oxygen, 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 18 of the 20 monitoring probes <br /> (Table 1). Probes 6-deep and intermediate both contain levels of combustible gas which exceed <br /> the regulatory limit. <br /> Combustible gas concentrations at GW- 6-deep shows significant and continuing decrease over Z--' <br /> the last year(Figure 3). <br /> Unfortunately, the methane content at GW-6-intermediate is again above the regulatory limit in <br /> this monitoring period(Table 1). Combustible gas concentration at this probe (and all probes, <br /> with the exception of GW-6-deep)have been in regulatory compliance since the first quarter of <br /> 2002 as a result of the collection of LFG. We believe the recent increase of combustible gas at <br /> Corral Hollow Landfill July 23,2002 <br /> San Joaquin County 2 Quarterly LFG Monitoring <br />