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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 /> The seven wells were monitored for methane on January 23, 2001. The results of the monitoring <br /> are shown on the table below. The County used the Landtec GEM 500 Gas Extraction <br /> Monitoring instrument. This instrument was calibrated by County staff prior to the sampling <br /> event. The Landtec GEM 500 is capable of measuring methane, carbon dioxide, oxygen, and <br /> nitrogen (balance gas) concentrations. <br /> Date: 01/23/01 <br /> Sampler: Najee Zarif <br /> Code Date CH4 CO2 02 Bal Pressure <br /> CHISHALL 1/23/00 1.0 2.1 14.6 82.3 0.0 <br /> CHIINT 1/23/00 17.2 17.7 0 65.1 0.0 <br /> CHIDEEP 1/23/00 45.8 16.3 0.9 37 0.0 <br /> CH2SHALL 1/23/00 47.9 18.7 0 33.4 0.0 <br /> CH21NT 1/23/00 43.6 20.6 0.7 35.1 0.0 <br /> CH2DEEP 1/23/00 27.9 18.4 1.6 52.1 0.0 <br /> CH3SHALL 1/23/00 29.1 17.3 0 53.6 0.0 <br /> CH31NT 1/23/00 30.3 20.3 0 49.4 0.0 <br /> CH3DEEP 1/23/00 15.6 17.7 0 66.7 0.0 <br /> CH4SHALL 1/23/00 0 0 18.8 81.2 0.0 <br /> CH41NT 1/23/00 0 0 18.3 81.7 0.1 <br /> CH4DEEP 1/23/00 0 0 19.3 80.7 0.0 <br /> CHSSHALL 1/23/00 0 2.0 17.1 80.9 0.0 <br /> CH51NT 1/23/00 0 3.8 16.1 80.1 0.1 <br /> CHSDEEP 1/23/00 0 7.2 8.4 84.4 0.3 <br /> CH6SHALL 1/23/00 0.1 4.0 11.5 84.4 0.0 <br /> CH61NT 1/23/00 28.2 16.1 0.4 55.3 0.2 <br /> CH6DEEP 1/23/00 53.2 25.3 0 21.5 0.6 <br /> CH7SHALL 1/23/00 0 0.4 17.1 82.5 0.0 <br /> CH71NT 1/23/00 0 3.9 6.8 89.3 0.0 <br /> 1 <br />