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URS November 9, 2023 Ms. Natalia Subbotnikova Program Coordinator R.E.H.S. San Joaquin County Environmental Health Department 1868 East Hazelton Avenue Stockton, California 95205-6232 Subject: 2023 Annual Monitoring Report World Enterprises Site, Stockton, California Dear Ms. Subbotnikova: URS Corporation Americas (URS), now an AECOM company, has prepared this 2023 Annual Monitoring Report on behalf of RS Legacy Corporation (formerly known as RadioShack Corporation). This report documents the results of the fourth quarter 2023 (4Q23) monitoring activities completed at the World Enterprises site in Stockton, California (site) (Figure 1). BACKGROUND The site is located at 3578 French Camp Turnpike Road, Stockton, California 95206. From 1970 to 1978, the site operated as a debris disposal site; debris was sourced from demolished buildings and included wood, rubble, concrete, and other fill materials. The site operated under San Joaquin Local Health District Use Permits issued to World Enterprises (URS 2004). On July 17, 2003, during an annual site inspection, San Joaquin County Environmental Health Department(SJCEHD) staff measured methane gas concentrations up to 30,000 parts per million by volume (ppmv) (or 3 percent by volume [%]) along the site boundary. Subsequent to this inspection, SJCEHD required Tandy Corporation (the site owner, now known as RS Legacy Corporation)to assess whether the methane concentrations along the site boundary could be greater than 5% and, if found to be greater than 5%,to implement measures for controlling methane from leaving the site (URS 2004). In November 2003, RS Legacy Corporation contracted with URS to assess the extent of methane at the site. On April 7, 2004, URS installed four gas-migration monitoring probes at the World Enterprises site (VW-1 through VW-4) (Figure 1) (URS 2005a). On October 12, 2004, URS installed four dual-screen (i.e., shallow and deep) gas migration monitoring probes (VW-5 through VW-8) (Figure 1) (URS 2005b). During quarterly field investigations in the first half of 2005, URS established that methane concentrations along the northwestern portion of the site boundary at VW- 4, VW-5S, VW-5D, VW-6S, and VW-6D were regularly above 5% (i.e., the lower flammability limit for methane). As a result, between June 1 and 2, 2005, URS installed two soil vapor extraction wells URS 2020 L Street,Suite 300 Sacramento,CA 95811 Tel:916.414.5800 Fax:916.414.5850