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- r1LFR <br /> VINE•FRICKE <br /> November 1, 2001 f 7979.00-002 <br /> u 2.001 <br /> Mr. Robert McClellon <br /> San Joaquin County Environmental Health Division <br /> 304 East Webber Avenue, 3rd Floor <br /> Stockton, California 95202 <br /> Subject: Fourth 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 (Allied) at the Austin Road Landfill in San Joaquin County <br /> during the fourth quarter of 2001. Allied has retained LFR to conduct quarterly soil gas and water <br /> quality monitoring at the Austin Road Landfill. <br /> Procedures <br /> Concentrations of methane, oxygen, and carbon dioxide in soil gas were monitored using a <br /> Landtec GEM 2000 gas analyzer (GEM) and extraction monitor. After checking the calibration of <br /> the GEM, a reading of ambient air in the vicinity of the probe being tested was recorded before <br /> soil gas was monitored at each probe. The GEM was attached to the soil gas probe, the valve was <br /> opened, and air was extracted by the GEM's internal pump. Readings for methane and oxygen <br /> were monitored for at least five minutes or until the readings stabilized. The reading was then <br /> recorded and the soil gas probe valve was closed. Soil gas monitoring was conducted at each of <br /> the soil gas probe locations presented in Figure 1 on October 9, 2001. <br /> Results <br /> As shown in Table 1, methane was not detected above its lower explosive limit in any of the soil <br /> gas probes at Austin Road Landfill during the fourth quarter of 2001. <br /> The GEM displayed 0.0 percent by volume for methane at all the Austin Road soil gas probes <br /> monitored during the fourth quarter 2001. Oxygen readings in soil gas probes ranged from 9.1 <br /> percent by volume in SGP-2A to 21.0 percent by volume in SGP-9A. Carbon dioxide readings <br /> ranged from 0.9 percent by volume in SGP-9A to 5.3 percent by volume in SGP-2A. These data <br /> are consistent with previous soil gas data at this site. <br /> 4080CavittStallmanRoad,Suite 100,Granite Bay,California 95746-9460 • (916)786.0320 • fax(916)786.0366 - www.ifr.com <br /> Offices Worldwide <br />