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i <br /> • • <br /> BUR <br /> vicinity of the probe being tested was recorded before soil gas was monitored within the probe. <br /> Initially, the GEM was attached to the soil gas probe, the valve was opened, and the initial soil gas <br /> probe pressure was monitored and recorded. Then the GEM's internal pump was activated to <br /> extract soil gas from the probe. Readings for methane, oxygen, and carbon dioxide were <br /> monitored until the readings stabilized. After the readings were recorded, the internal pump was <br /> deactivated and the post reading soil gas probe pressure was monitored and recorded. The soil gas <br /> probe valve was then closed, and the GEM was disconnected. <br /> Results <br /> As shown in Table 1, methane was detected above its LEL in SGP-2A at a concentration of 18.1 <br /> percent by volume on May 8, 2002. The GEM displayed 1.3 percent by volume for methane at <br /> SGP-3B. No methane was detected at SGP-4A during the May 8, 2002 monitoring event. Oxygen <br /> readings in soil gas probes ranged from 1.9 percent by volume in SGP-2A to 15.9 percent by <br /> volume in SGP-3B. Carbon dioxide readings ranged from 1.2 percent by volume in SGP-313 to 8.6 <br /> percent by volume in SGP-2A. The relative air pressure of the probes ranged from -0.1 to 0.0 <br /> inches of water, indicating that the pressure within the soil gas probes is at or near equilibrium <br /> with atmospheric pressure. <br /> These data are consistent with previous soil gas data collected at this site on May 2, 2002. Soil gas <br /> monitoring will be conducted again during the third quarter of 2002. If you have any questions, <br /> please call me at (916) 786-0320. <br /> Sincerely, <br /> xl:�s <br /> J. Scott Seyfried, R.G. <br /> Principal Scientist <br /> Enclosures: Figure 1, Table 1 <br /> cc: Ross Atkinson, RWQCB <br /> Butch Stefani, Forward Landfill <br /> Lochlin Caffey, Allied Waste Industries <br /> Project File, LFR-Granite Bay <br /> 2 <br />