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01./31/2006 19:13 FAX 916679290 URS—SACRAMENTO—GO Q002/009 <br /> UM <br /> January 31,2006 • <br /> Mr.Robert McClellon <br /> Supervisor R.E.H.S. <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue,Third Floor <br /> Stockton,California 95202-2708 <br /> Subject; Quarterly Monitoring Report <br /> World Enterprises Site <br /> Stockton,CaRfornia <br /> Dear Mr.McClellon: <br /> URS has prepared this letter report on behalf of RadioShack to describe the quarterly monitoring field <br /> activities completed at the World Enterprises site in Stockton,California,on December 2,2005,and to <br /> summarize the results of these monitoring activities. <br /> This report includes into the following sections:Background,Feld Activities,Results,and Conclusions <br /> and Recommendations. <br /> BACKGROUND <br /> The World Enterprises site in Stockton,California,was formerly permitted as a debris-disposal site;the <br /> debris was from demolished buildings and included wood,rubble,concrete,and other fill materials.On <br /> July 17,2003,Mr.Robert McClellon and Mr.Ted Tasiopoulos of SJCEHD conducted an annual <br /> inspection at the World Enterprises site that included the measurement of the methane concentration <br /> from nine temporary boreholes located along the perimeter of the site.As a result of this annual <br /> inspection,URS has completed three phases of field investigations to assess the extent of the methane at <br /> the site.On April 7,2004,URS installed four gas-migration monitoring probes at the World Enterprises <br /> site.On October 12,2004,URS installed four dual-completion gas-migration monitoring probes at the <br /> World Enterprises site.On June 1 and 2,2005,URS installed two soil vapor extraction wells and two <br /> gas-migration monitoring probes at the World Enterprises site(Figure 1).The quarterly monitoring <br /> activities have been conducted since July 2004. <br /> FEELD ACTMTEES <br /> On December 2,2005,each probe was measured for methane,oxygen,and carbon dioxide using a hand- <br /> held,portable GEM 2000 landfill gas monitor.These measurements were recorded in a field book. <br /> URS Group,Inc. <br /> Crown Corporate Center <br /> 2870 Gataway Oaks Drive,Suite 300 <br /> Sacramento,CA 95833 <br /> Tet:916.679.2000 <br /> Fax:916.679.2900 K:\wpsocess\25532\world6aterp \QuartalyRpA4Q05\CovLtr.doc <br />