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12/27/02 FRI 13:36 FAX 19162355 SHAW E & I 2003 Shaw Environmental& Infrastructure, Inc. 4405 Port Chicago Highway Concord, CA 94520-7720 925.288.9898 Fax 925,288.0888 11MMcl V The Shz w Group Inc." November 27, 2002 Mr. Dennis C,ttanyag San Joaquin,County Environmental Health 304 East Web er Avenue, Third Floor Stockton, Cal:fornia 95202 Subject: Scope of Work for Proposed Temporary LIST Closure Activities,Pacific Bell Facility,4051 Newton Road, Stockton,Coil ifornia Dear Mr. Cats unyag: On behalf of Pacific Bell, Shaw Environmental Inc. (Shaw) is pleased to present this scope of work peritainirtg to proposed temporary underground storage tank (UST) closure activities at the above-mentio rsed Pacific Bell facility. There is a 10,000-gallon UST containing gasoline at that site that Pacif ic Bell would like to take out of service pend[tig potential future re-use. The following sco pe of work details anticipated closure activitie,,,to be performed in order to meet the State of C alifomia Code of Regulations Title 23, Divisi(in 3, Chapter 16, Section 2671 UST temporary cic sure regulations and the San Joaquin County I:.nvironmental Health Department closure requirements. The permit application is included i,l Attachment 1. Copies of the State of California forms are included in Attachment 2. Scope of Wo rk Prior to temporary closure activities,Pacific Bell will arratkj,g for the removal of any fuels within the UST systf m. Prior to performing any work, Shaw perE a nnel and their subcontractors will review the he tlth and safety plan(Attachment 3). The UST and associated piping will then be triple-rinsed by a hazardous-certified subcontractor using r.aot=pressure washer and detergent in order to remo ve any residual liquids, solids, or sludge. Fol.l)wing rinsing, the tank will be visually inspc cted to ensure all liquids, solids, or sludge ha v e been removed. The rinsate will then be transl oiled off-site under a hazardous waste maniiei.t to Rom c Environmental Technologies Corporation in East Palo Alto, California for recycling. A copy of the rinsate manifest will be forwarded to the San Joaquin County Environmental Health upon receipt. Following riri sing activities,the atmosphere of the tank wi it be inerted using dry ice at a rate of approximatel f 20 pounds per 1,000-gallons capacity. After approximately 15 minutes, the lower explosive limits (LEL)and oxygen concentrations will be:measured. Once the LEL and oxygen concentration s are below 10%, the tanks access ports will 1):sealed using locking caps. The vent pipe will not ae sealed per UST temporary closure requirein,ents. The power will then be disconnected from the fuel dispensers and locked out. The misting tank monitoring system will remain opera ional.