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' Shaweironmental & Infrastructure, Inc. 4005 Port Chicago Highway Concord, CA 94520-1120 925.288.9898 Fax 925.288.0888 IShaW The Shaw Group Inc."" IFebruary 4, 2003 1 Mr. Andrew Taylor SBC ' 2600 Camino Ramon; Room#3E000 San Ramon, California 94583 Subject: Letter Report for Temporary UST Closures, Various SBC Facilities, California ' Dear Mr. Taylor: Shaw Environmental Inc. (Shaw) is pleased to present this letter report outlining temporary ' underground storage tank(UST) closure activities completed at 26 SBC facilities located throughout California. The temporary tank closure activities were performed in preparation for future re-use or potential removal in 2003. Field activities were completed in accordance with the State of California Code of Regulations Title 23, Division 3, Chapter 16, Section 2671 UST temporary closure regulations and specific local oversight agency requirements. A list of the various SBC sites is included in Table 1. Field Activities Prior to performing any field activities, Shaw submitted permit applications to the appropriate local oversight agencies. Copies of the permits that were issued to Shaw are included in Attachment 1. SBC had previously arranged for removal of remaining fuel from the USTs or for the USTs to be used until empty. In addition, Shaw personnel and their subcontractors reviewed e a site-specific health and safety plan outlining any potential hazards and outline appropriate responses prior to conducting closure activities. ' The electrical power to the fuel dispensers was disconnected and locked out/tagged out by Performance Electrical, Inc. of Modesto, California, with the tank monitoring system remaining operational. The check valves for the piping were then opened, with the USTs and associated piping rinsed by hazardous waste-certified subcontractors using a hot-pressure washer and detergent. Following rinsing, the tanks were then visually inspected to ensure all liquids, solids, ' or sludge have been removed. In order to inert the atmosphere of the tanks, dry ice was then placed in the tanks at a rate of at ' least 20 pounds per 1,000-gallons capacity, with additional dry ice added as needed. Time was then allowed for the dry ice to displace residual vapors from the tank before measuring the lower explosive limit(LEL) and percent oxygen within the tanks. Once the oxygen and LEL ' concentrations were below 10% or permission was given from the regulator to proceed,the CNCO:ISHAREIUST103-0004.doc