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fr <br /> The Corral Hollow Sanitary Landfill is located on Corral Hollow Road approximately 5 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 February 5, 1999. 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 the manufacturer 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: 2/5/99 <br /> Sampler: Michael Kalish <br /> Code Date CH4 CO2 02 Bal Pressure <br /> CHISHALL 2/5/99 1.2 1.9 19.4 77.5 0 <br /> CHIINT 2/5/99 0 0 20.6 79.4 0 <br /> CHIDEEP 2/5/99 27.5 21.8 4.2 45.5 0 <br /> CH2SHALL 2/5/99 57.2 27.9 0 14.9 0 <br /> CH2INT 2/5/99 0.4 0.5 20.4 78.7 0 <br /> CH2DEEP 2/5/99 26.5 17.4 10.4 45.7 -0.2 <br /> CH3 SHALL 2/5/99 39.3 33.9 0 26.8 0 <br /> CH31NT 2/5/99 35 34.8 0 30.2 0 <br /> CH3DEEP 2/5/99 0 0.1 20.6 79.3 0 <br /> CH4SHALL 2/5/99 0 0 20.2 79.8 0 <br /> CH4INT 2/5/99 0 0 20.6 79.4 0 <br /> CH4DEEP 2/5/99 0 0 20.8 79.2 0 <br /> CH5 SHALL 2/5/99 0 3.8 16.6 79.6 0 <br /> CHSINT 2/5/99 0 3.6 16.9 79.5 0 <br /> CHSDEEP 2/5/99 0 7.6 12.4 80 -0.3 <br /> CH6SHALL 2/5/99 14.3 18.3 0.4 67 0 <br /> CH61NT 2/5/99 0 0 20.8 79.2 0 <br /> CH6DEEP 2/5/99 0.2 0.2 20.3 79.3 0 <br /> CH7SHALL 2/5/99 0 0.2 19.6 80.2 0 <br /> CH71NT 2/5/99 0 0 20.5 79.5 0 <br /> 3 <br />