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The Corral Hollow Sanitary Landfill is located on Corral Hollow Road approximately 5 miles south of <br /> Tracy, California(Figure 1). The site is a Class III landfill which stopped accepting waste in May, <br /> 1995. In accordance with closure regulations, a network of seven perimeter gas monitoring wells was <br /> installed by SCS Engineers (Figure 2). <br /> The seven wells were monitored for methane on April 30, 1999. The results of the monitoring are <br /> shown on the table below. The County used the Landtec GEM 500 Gas Extraction Monitoring <br /> instrument. This instrument was calibrated by County Staff prior to the sampling event. The Landtec <br /> GEM 500 is capable of measuring methane, carbon dioxide, oxygen, and nitrogen(balance gas) <br /> concentrations. <br /> Date: 4/30/99 <br /> Sampler: Michael Kalish <br /> Code Date CH4 CO2 02 Bal Pressure <br /> CHISHALL 4/30/99 0.2 1.3 18.6 79.9 0 <br /> CHIINT 4/30/99 0 0.1 19.3 80.6 0 <br /> CHIDEEP 4/30/99 51.3 33.8 0 14.9 0 <br /> CH2SHALL 4/30/99 47.7 30.6 1.9 19.8 0 <br /> CH21NT 4/30/99 0 0.5 19 80.5 0 <br /> CH2DEEP 4/30/99 58.3 39.2 0 2.5 0 <br /> CH3SHALL 4/30/99 50.7 35.3 0 14 0 <br /> CH31NT 4/30/99 38.9 34.4 0 26.7 0 <br /> CH3DEEP 4/30/99 28.9 31.1 0 40 0 <br /> CH4SHALL 4/30/99 0.1 0.2 17.9 81.8 0 <br /> CH41NT 4/30/99 0 0.1 17.8 82.1 0 <br /> CH4DEEP 4/30/99 0 0.1 18.6 81.3 0 <br /> CHSSHALL 4/30/99 0.1 7.5 7 85.4 0 <br /> CH51NT 4/30/99 1.2 14.1 0.2 84.5 0 <br /> CHSDEEP 4/30/99 2.6 14.9 0 82.5 0 <br /> CH6SHALL 4/30/99 12.5 17.3 0 70.2 0 <br /> CH61NT 4/30/99 42.9 35.7 0 21.4 0 <br /> CH6DEEP 4/30/99 17.8 19.2 10.8 52.2 0 <br /> CH7SHALL 4/30/99 0.2 0.9 18.4 80.5 0 <br /> CH71NT 4/30/99 0 0.1 19.2 80.7 0 <br /> 3 <br />