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GLFR <br /> LEVINE•FRICKE <br /> March 13, 2002 003-07979-00-002 <br /> Mr. Robert McClellon ry 1 2000 <br /> San Joaquin County Environmental Health Division <br /> AI <br /> 304 East Webber Avenue, 3rd Floor � �, H <br /> Stockton, California 95202 u <br /> Subject: First Quarter 2002 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 first quarter of 2002. Allied has retained LFR to conduct quarterly soil gas and water <br /> quality monitoring at the Austin Road Landfill. Soil gas monitoring was conducted on March 6, <br /> 2002 at the closed scale-house and 12 soil gas probe locations presented on Figure 1. <br /> Procedures <br /> Concentrations of methane, oxygen, and carbon dioxide within the 12 soil gas probes were <br /> monitored using a calibrated Landtec GEM 2000 gas analyzer and extraction monitor (GEM). The <br /> GEM was certified as calibrated to factory specifications by the rental supplier, EquipCo, prior to <br /> each sampling event. At each probe, a reading of ambient air in the vicinity of the probe being <br /> tested was recorded before soil gas was monitored within the probe. Initially, the GEM was <br /> attached to the soil gas probe, the valve was opened, and the initial soil gas probe pressure was <br /> monitored and recorded. Then the GEM's internal pump was activated to extract soil gas from the <br /> probe. Readings for methane, oxygen, and carbon dioxide were monitored until the readings <br /> stabilized. After the readings were recorded, the internal pump was deactivated and the post <br /> reading soil gas probe pressure was monitored and recorded. The soil gas probe valve was then <br /> closed, and the GEM was disconnected. <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 first quarter of 2002. The GEM displayed 3.2 <br /> percent by volume for methane at soil gas probe-2A (SGP-2A) and 0.8 percent by volume of <br /> methane at SGP-lA. All the other soil gas probes at the Austin Road landfill displayed no <br /> methane during the first quarter 2002. <br /> 4080CavittStallmanRoad,Suite 100,Granite Bay,California 95746-9460 • (916)786-0320 • fax(916)786-0366 • www.Ifr.com <br /> Offices Worldwide <br />