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f • • <br /> BUR <br /> LEVINE• FRICKE <br /> September 26, 2001 PP, Q,: 5 9 7979.00-002 <br /> Mr. Robert McClellon <br /> San Joaquin County Environmental Health Division <br /> 304 East Webber Avenue, 3rd Floor <br /> Stockton, California 95202 <br /> Subject: Third 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) on <br /> behalf of Allied Waste Industries at the Austin Road Landfill in San Joaquin County during the <br /> third 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 /> Concentrations of methane, oxygen, and carbon dioxide in soil gas were monitored using a Landtec <br /> GEM 2000 gas analyzer (GEM) and extraction monitor. After checking the calibration of the <br /> GEM, a reading of ambient air in the vicinity of the probe being tested was recorded before soil <br /> gas was monitored at each probe. The GEM was attached to the soil gas probe valve and air was <br /> extracted by the GEM's internal pump. Readings for methane and oxygen were monitored for at <br /> least five minutes or until the readings stabilized. The readings were recorded and the soil gas <br /> probe valve was closed. Soil gas monitoring was conducted at each of the soil gas probe locations <br /> presented in Figure 1 on August 2, 2001. <br /> Resu Its <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 third quarter of 2001. <br /> The GEM displayed 0.0 percent by volume for methane at all the soil gas probes monitored during <br /> the August 2001 monitoring event. Oxygen readings in soil gas probes ranged from 8.9 percent by <br /> volume (SGP-2A) to 20.4 percent by volume (SGP-9A). Carbon dioxide reading ranged from 0.9 <br /> percent by volume (SGP-10B) to 4.4 percent by volume (SGP-2A). These data are consistent with <br /> previous soil gas data at this site. <br /> 4080CavittStal[man Road,Suite 100,Granite Bay,California 95746-9460 , (916)786-0320 • fax(916)786-0366 • www.ifr.com <br /> 1tr-ARlrsoi1_9as-3Q2001.doc:DMS Offices Otdrsafetw i d e <br />