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4 % 00 <br /> URS 7n E n <br /> CEG �� <br /> January 31, 2006 <br /> hiAY 2J 2 2006 <br /> i ^ -iiEti(ViEW <br /> PERI MSERVICES <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, California <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,Field 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 /> FIELD ACTIVITIES <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 Gateway Oaks Drive,Suite 300 <br /> Sacramento,CA 95833 <br /> Tel: 916.679.2000 <br /> Fax:916.679.2900 K:\Wprocess\25532\WorldEnterprise\Quarterly Rpt\4Q05\CovLtr.doc <br />