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Mr. Robert McClellon <br />April 29, 2010 <br />Page 4 <br />concentration has decreased within these probes to less than 5 percent by volume during the following <br />quarter and has continued to be less than 5 percent during the subsequent quarters. Methane <br />concentrations measured within all probes during the first quarter of 2010 were less than 5 percent by <br />volume. Based on the results during this quarter, compared to the results prior to the passive soil vapor <br />extraction installation, the passive soil vapor extraction trench appears to be effective at controlling <br />methane from leaving the site. URS, on behalf of RadioShack, plans to continue monitoring activities for <br />measuring landfill gas concentrations within the probes, extraction wells, and passive vents on a <br />quarterly basis. <br />Should you have any questions regarding this report, please contact me at (916) 679-2081. <br />Very truly yours, <br />URS <br />Kamine <br />en r Civil Engineer <br />Enclosures: <br />Table 1 Summary of 2010 Field Measurement Results <br />Table 2 Dissolved Metals Results, Total Dissolved Solids Results, and Field Measurement <br />Results Summary in Groundwater <br />Figure 1 Site Plan <br />Figure 2 Groundwater Elevation — March 2010 <br />Attachment 1 Monitoring Well Sampling Data Logs <br />Attachment 2 Analytical Report <br />cc: Jaime Caballero (RadioShack) <br />John Macanas (C1WMB) <br />Ross Atkinson (RWQCB) <br />H \Wprocess\25532\WorldEnterprise\Quarterly Rpt\2010\ IQ I OAQ I 0_0429 I O.doc <br />