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0 <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 /> The seven wells were monitored for methane on November 2, 2000. The results of the <br /> monitoring are shown on the table below. The County used the Landtec GEM 500 Gas <br /> Extraction Monitoring instrument. This instrument was calibrated by County staff prior to the <br /> sampling event. The Landtec GEM 500 is capable of measuring methane, carbon dioxide, <br /> oxygen, and nitrogen (balance gas) concentrations. <br /> Date: 11/02/00 <br /> Sampler: Dan Johnson <br /> Code Date CH4 CO2 02 Bal Pressure <br /> CH 1 SHALL 11/02/00 0.4 1.0 17.8 80.8 0.0 <br /> CH 1 INT 11/02/00 19.9 18.3 0 61.8 0.0 <br /> CH 1 DEEP 11/02/00 45.5 18.8 0 35.7 0.0 <br /> CH2SHALL 11/02/00 50.8 20.4 0 28.8 0.0 <br /> CH21NT 11/02/00 49.1 22.6 0.2 28.1 0.1 <br /> C112DEEP 11/02/00 37.1 19.5 2.9 40.5 0.1 <br /> C113SHALL 11/02/00 33.5 17.9 0 48.6 0.0 <br /> CH31NT 11/02/00 30.3 20.8 0 48.9 0.0 <br /> CH3DEEP 11/02/00 17.6 18.1 0 64.3 0.0 <br /> CH4SHALL 11/02/00 0 0 18.5 81.5 0.0 <br /> CH41NT 11/02/00 0 0 18.6 81.4 0.2 <br /> CH4DEEP 11/02/00 0 0 19.1 80.9 0.1 <br /> CHSSHALL 11/02/00 0 2.0 16.7 81.3 0.0 <br /> CH51NT 11/02/00 0 3.8 15.3 80.9 0.1 <br /> CHSDEEP 11/02/00 0 0.1 17.5 82.4 0.2 <br /> CH6SHALL 11/02/00 0 3.0 13.6 83.4 0.0 <br /> CH61NT 11/02/00 20.6 13.1 0 66.3 0.2 <br /> C116DEEP 11/02/00 43.7 24.7 0 31.6 0.2 <br /> CH7SHALL 11/02/00 0 0.6. 17.7 81.7 0.0 <br /> CH71NT 11/02/00 0 4.6 6.1 89.3 0.0 <br /> 1 <br />