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f t <br /> Mr. Robert McClellon <br /> October 31, 2007 <br /> Page 5 <br /> quarter, compared to the results prior to the passive soil vapor extraction installation,the passive soil <br /> vapor extraction trench appears to be effective at controlling methane from leaving the site.Because the <br /> passive soil vapor extraction trench appears to be effective at controlling methane from leaving the site, <br /> URS recommends that the monitoring activities for measuring the landfill gas concentrations within the <br /> probes, extraction wells, and passive vents be continued quarterly. <br /> Should you have any questions regarding this report,please contact me at(916)679-2081. <br /> Very truly yours, <br /> URS <br /> Ja amine <br /> S ni Civil Engineer <br /> nclosures: Table 1 —Field Measurement Results Summary <br /> Table 2—Dissolved Metals Results,Total Dissolved Solids Results and Field <br /> Measurement Results Summary in Groundwater <br /> Figure 1 —Site Plan <br /> Figure 2—Groundwater Elevation—September 2007 <br /> Attachment 1 —Monitoring Well Sampling Data <br /> Attachment 2—Uniform Hazardous Waste Manifests <br /> Attachment 3—Analytical Report <br /> cc: Judy McCampbell(RadioShack) <br /> John Macanas(CIWMB) <br /> Ross Atkinson(RWQCB) <br /> K:\Wprocess\25532\WorldEnterprise\Quarterly Rpt\2007\3Q07\103107.doc <br />