|
D
<br /> URS
<br /> May 4, 2005
<br /> kIJAY 0 5 ?005
<br /> Mr. Robert McClellon ENVIRONMENT HEALTH
<br /> Supervisor R.E.H.S.
<br /> San Joaquin County Environmental Health Department PERMIT/SERVICES
<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 April 29, 2005. The report
<br /> also summarizes the results of these monitoring activities.
<br /> This report includes the following sections: Background,Field Activities,Results,and Conclusions and
<br /> Recommendations.
<br /> BACKGROUND
<br /> The World Enterprises site in Stockton,California, was formerly permitted as a debris disposal site; the
<br /> debris,from demolished buildings, included wood,rubble,concrete,and other fill materials. On April 7,
<br /> 2004,URS installed four single completion gas-migration monitoring probes at the World Enterprises
<br /> site. On July 9, 2004,the monitoring activities at the site were completed. During the July 9, 2004,
<br /> monitoring activities,methane was measured within probe VW-4 at a concentration of 18.9 percent. As a
<br /> result of this measurement, San Joaquin County Environmental Health Department(SJCEHD)
<br /> transmitted a letter to RadioShack,dated July 13,2004, "requiring the site owner to submit a remediation
<br /> plan within sixty(60)days of receipt of this letter to EHD for methane gas releases at the site."
<br /> According to California Code of Regulations(CCR)Title 27,Division 2, Subdivision 1, Chapter 3,
<br /> Subchapter 4,Article 6, Section 20919.5(c)(3), ". . . the plan shall describe the nature and extent of the
<br /> 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 explained that because the size of the
<br /> methane plume was not known at the time,the transmittal of a remediation plan would be premature;
<br /> before a remediation plan was prepared, a better understanding of the extent of the methane plume along
<br /> the northern boundary of the site was needed. Following SJCEHD's review of the September 13, 2004,
<br /> work plan, SJCEHD transmitted its review comments in an e-mail message on September 23, 2004. A
<br /> work plan addendum to address SJCEHD's review comments was transmitted to SJCEHD for approval
<br /> on October 4, 2004. The work plan and addendum were subsequently approved by SJCEHD. On
<br /> October 12, 2004,URS installed four dual completion gas-migration monitoring probes at the World
<br /> Enterprises site as shown on Figure 1.
<br /> URS Corporation
<br /> 2520 Venture Oaks way, Suite 250
<br /> Sacramento,CA 95833-3200
<br /> Tel: 916.679.2000
<br /> Fax: 916.929.7263 K:\Wprocess\25532\WorldEnterprise\Quarterly Rpt\2Q05\CovLtr.doc
<br />
|