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Al U July 14, 2005 RECENED Mr. Robert McClellon JUL 1 5 2005 Supervisor R.E.H.S. San Joaquin County Environmental Health Department ENVIRONMENT HEALTH 304 East Weber Avenue,Third Floor PERMIT/SERVICES Stockton,California 95202-2708 SUBJECT: Work Plan for Short Duration Vapor Extraction Pilot Test World Enterprises Site Stockton,California Dear Mr. McClellon, On behalf of RadioShack, URS proposes to conduct pilot test landfill gas extraction activities at the World Enterprises site(Site)in Stockton, California. We would like to conduct this pilot test within 2 to 3 weeks following your approval and the concurrence of the San Joaquin Valley Air Pollution Control District. Background The World Enterprises site in Stockton, California, was formerly permitted as a debris-disposal site. The primary debris was from demolished buildings and included wood, rubble, concrete, and other fill materials. The site was capped and is no longer an active landfill. On April 7, 2004, URS installed four single-completion gas-migration monitoring probes, and on October 12, 2004, URS installed four dual-completion gas-migration monitoring probes at the World Enterprises site, as shown on Figure 1. On June 1 and 2, 2005, URS installed two single-completion gas-migration monitoring probes and two landfill gas extraction wells, and on June 9, 2005, landfill gas measurements were collected from the 10 monitoring probes and the 2 landfill gas extraction wells. The results of the monitoring of each probe and each extraction well since July 2004 are summarized in Table 1. These monitoring results were obtained using a GEM 2000 landfill gas monitor. The type of equipment used for this landfill gas extraction pilot test was selected based on the monitoring results for the extraction wells. Purpose of Testing The purpose of this pilot test is to evaluate the feasibility of installing a permanent landfill gas extraction system to address the subsurface migration of methane gas at the Site. Parameters to be measured during the test include soil gas flow rate and vapor contaminant concentrations. The test results will be used to establish operating design parameters for a long-term remediation system, if necessary. The duration of the pilot test will be limited to less than five days to comply with San Joaquin Valley Air Pollution Control District Rule 2020 — Exemptions. Section 7.5 of Rule 2020 indicates that no Authority to Construct or Permit to Operate shall be required for pilot tests that do not last more than five days. URS Corporation Crown Corporate Center 2870 Gateway Oaks Drive, Suite 300 Sacramento,CA 95833 Tel: 916.679.2000 Fax: 916.679.2900 K:\Wprocess\25532\WorldEnterprise\GWMPIR\letter.doc