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The Corral Hollow Sanitary Landfill is located on Corral Hollow <br />Road approximately 5 miles south of Tracy, California (Figure 1). <br />The site is a Class III landfill which stopped accepting waste in <br />May, 1995. In accordance with closure regulations, a network of <br />seven perimeter gas monitoring wells was installed by SCS <br />Engineers (Figure 2). <br />The seven wells were monitored for methane on March 28, 1996. <br />The results of the monitoring are shown on the following table. <br />The County recently purchased a Landtec GEM 500 landfill gas <br />monitor. The GEM 500 is capable of detecting methane in total <br />percentages and Lower Explosive Limit, Carbon Dioxide, and Oxygen <br />concentrations. In addition, the GEM is capable of measuring <br />pressure and gas flow. As previously reported in a memo to the <br />San Joaquin County Environmental Health Division, the County's <br />Gas Tech Landfill monitor had to be sent in for repairs. <br />Therefore, the GEM 500 was used to perform the first quarter <br />monitoring event for the Corral Hollow Sanitary Landfill. The <br />County will continue to use the GEM 500 for future monitoring <br />events. The instrument was calibrated using calibration gas <br />canisters containing (1) 15% methane, 15% Carbon Dioxide, balance <br />Nitrogen, and (2) 4% oxygen, balance Nitrogen. <br />