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1.0 INTRODUCTION This report is about the removal of (1) empty 10,000 Gallon (out-of-service) underground storage tank located at 26200 Nowell Road in Thornton, California. The purpose of this report is to satisfy regulatory requirements surrounding removal and disposal of underground storage tanks. The contents of this report are based upon provisions promulgated by Title 40 Code of Federal Regulations, Part 280, Subsections 280.71 through 280.73 (40 CFR 280); Title 23 California Code of Regulations, Chapter 3, Subchapter 16, Article 7—Removal Requirements (23 CCR, Chapter3); Health and Safety Code, Division 20, Chapter 6.5 This report is a narrative of events performed under the guidelines of the Tank Removal Permit issued by the Newark Fire Department, and the State of California Regional Water Quality Control Board (RWQCB) "Tri- Regional Board Staff Recommendations for Preliminary Evaluation and Investigation of Underground Storage Tank Sites", August 10, 1990. Wright removed (1) double walled steel underground storage tank with a capacity of 10,000 gallons after it was discovered during on going construction activities at the above referenced address. The tank was to be removed and disposed of in accordance with guidelines established by the Regional Water Quality Control Board and the Environmental Protection Agency. The tank was to be purged and then certified "empty" prior to removal and transportation. 2.0 FACILITY DESCRIPTION The Universal Forest Products site is a finished lumber processing plant. The property itself is on 50 acres located at 26200 Nowell Road in the City of Thornton, California. 3.0 TANK DESCRIPTION AND BACKGROUND The tank was located near the middle 113 portion of the Western fence line of the property. The tank was a double-walled steel, 10,000 Gallon storage tank. The tank was installed on an unknown date and most probably stored diesel fuel. It is assumed that this tank provided fuel for a boiler system in a former adjacent building. Piping from the tank led towards what used to be a boiler room on the adjacent lot. Permit applications for tank removal were submitted and obtained from the San Joaquin County Department of Environmental Health under The Underground Storage Tank Program. A permit was also required and obtained from the San Joaquin County Fire Department. No other environmental permits are associated with the tank in question. State Permit applications forms A and B were included with Fire Department permit application. The tank was cylindrical in shape, setting horizontally and measures 96 inches in diameter. The tank rests on a bed of silty sandy soil material, which also surrounds and covers the tank. 1