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r ? M so <br /> UTDC <br /> Mr. Robert McClellon <br /> January 28, 2005 <br /> Page 2 <br /> FIELD ACTIVITIES <br /> On January 20, 2005,the monitoring activities at the site were completed. Each probe was measured for <br /> methane,oxygen, and carbon dioxide using a hand-held,portable GEM 2000 landfill gas monitor. These <br /> measurements were recorded in the field book. <br /> RESULTS <br /> The methane concentrations in VW-1,VW-2,VW-3,VW-7S,VW-713,VW-8S, and VW-813 were 0%. <br /> The methane concentrations in VW-4,VW-5S,VW-513,VW-6S,and VW-613 were 0.9%, 15.0%, <br /> 11.0%, 13.1%, and 12.1%,respectively. The oxygen concentration in the probes ranged from 0% to <br /> 18.9%. The carbon dioxide concentration in the probes ranged from 0.7%to 25.0%. The results for each <br /> probe are summarized in Table 1. <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> Methane was measured above 5.0% in VW-5S,VW-513,VW-6S, and VW-613. Based on the most recent <br /> quarterly results,the western extent of the methane plume is not currently known along the northern <br /> boundary of the site.We recommend that additional probes be installed at the site. If you have any <br /> questions,please give me a call at(916)679-2081. <br /> Sincerely, <br /> URS Corporation Americas <br /> WJaKa7"*ne <br /> iEngineer <br /> JGK/gng <br /> Enclosures: Table 1 —Summary of Results <br /> Figure 1 —Site Plan <br /> K:\Wprocess\25532\WorldEnterprise\Quarterly Rpt\IQ05\CovLtr.doc <br />