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URS
<br /> January 28,2005
<br /> Mr. Robert McClellon 3 12005
<br /> Supervisor R.E.H.S. ENVIRONMENT HEALT14
<br /> San Joaquin County Environmental Health Department PE(s'M T/SE,RVICES
<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 January 20,2005 and
<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 /> April 7, 2004,URS installed four gas-migration monitoring probes at the World Enterprises site. On July
<br /> 9, 2004,the monitoring activities at the site were completed. During the July 9, 2004,monitoring
<br /> activities,methane was measured within probe VW-4 at 18.9%. As a result of this measurement, San
<br /> Joaquin County Environmental Health Department(SJCEHD)transmitted a letter to RadioShack,dated
<br /> July 13, 2004, "requiring the site owner to submit a remediation plan within sixty(60)days receipt of
<br /> this letter to EHD for methane gas releases at the site."According to California Code of Regt! ations
<br /> (CCR)Title 27,Division 2, Subdivision 1,Chapter 3, Subchapter 4,Article 6, Section 20919.5(c)(3),
<br /> ". . . the plan shall describe the nature and extent of the problem and the proposed remedy."
<br /> A work plan to install four additional gas-migration monitoring probes at the site was transmitted to
<br /> SJCEHD for approval on September 13,2004. This work plan provided an explanation that since the
<br /> size of the methane plume was not known at this time,the transmittal of a remediation plan would be
<br /> premature, and that before a remediation plan was prepared,a better understanding of the extent of the
<br /> methane plume along the northern boundary of the site was needed. Following SJCEHD's review of the
<br /> September 13, 2004, work plan, SJCEHD transmitted its review comments in an e-mail message on
<br /> September 23, 2004. A work plan addendum to address SJCEHD's review comments was transmitted to
<br /> SJCEHD for approval on October 4,2004. The work plan and addendum were approved by SJCEHD.
<br /> On October 12,2004, URS installed four dual gas-migration monitoring probes at the World Enterprises
<br /> site shown on Figure 1.
<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\1Q05\CovLtr.doc
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