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SUR <br /> LEVINE•FRICKE <br /> August 10, 2001 7979.OQ 002 <br /> P <br /> 1^J <br /> G� <br /> Mr. Robert McClellon <br /> San Joaquin County Environmental Health Division <br /> 304 East Webber Avenue, 3rd Floor <br /> Stockton, California 95202 <br /> Subject: Second Quarter 2001 Soil-Gas Monitoring Report, Austin Road Landfill, San Joaquin <br /> County, California <br /> Dear Mr. McClellon: <br /> This letter report presents results of soil-gas monitoring conducted by LFR Levine-Fricke (LFR) <br /> on behalf of Allied Waste Industries at the Austin Road Landfill in San Joaquin County during the <br /> second quarter of 2001. Allied Waste Industries has retained LFR to conduct quarterly soil-gas and <br /> water-quality monitoring at the Austin Road Landfill. <br /> Procedures <br /> Soil-gas concentrations were monitored using a Landtec GEM 2000 gas analyzer and extraction <br /> monitor. After checking the calibration of the GEM, a reading of ambient air in the vicinity of the <br /> probe being tested was recorded before soil gas was monitored at each probe. The GEM 2000 <br /> analyzer was attached to the soil-gas probe valve and gas was extracted by the GEM's internal <br /> pump. Readings for methane and oxygen were monitored for at least five minutes or until the <br /> readings stabilized. The readings were recorded and the soil-gas probe valve was closed. <br /> Results <br /> Methane and oxygen concentrations were monitored at Austin Road Landfill on May 31, 2001. <br /> Methane was not detected above its lower explosive limit (LEL) in any of the soil-gas probes at <br /> Austin Road Landfill during the second quarter of 2001. Soil-gas probe locations are shown on <br /> Figure 1. Monitoring results are presented in Table 1. <br /> The gas analyzer displayed concentrations between 0.0 and 0.1 percent by volume of methane for <br /> all the soil-gas probes monitored during the May 2001 event. Methane was recorded at 0.1 percent <br /> by volume at only one soil-gas probe (SGP-3B). A reading of 16.6 percent by volume of oxygen <br /> was recorded at this same probe. Oxygen at soil-gas probe SGP-2A was recorded at a relatively <br /> reduced level of 4.6 percent by volume. Methane was not detected in this probe. <br /> 1900 Powell Street, 12th Floor, Emeryville, California 94608-1827 • (510) 652-4500 • fax (510) 652-2246 • www.Ifr.com <br /> Offices Worldwide <br />