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2.0 UST Removal Field Activities 2.1 Tank Removal On December 18, 2002, as part of the temporary closure activities, the UST was triple rinsed by Ecology Control Industries (ECI)personnel using a fresh water/detergent mixture and a hot water pressure washer. The tank's contents(gasoline and diesel fuel) had been removed prior to 160 rinsing activities. Following rinsing, visual inspection of the tank did not indicate any residual sludge or liquid on the visible portions of the interior of the tank. Approximately 1,500 gallons of rinsate were removed from the tank using a vacuum truck. The rinsate was then transported for disposal, under manifest number 21394856, to Romic Chemical Corporation in East Palo Alto, California. A copy of the manifest for the rinsate is included in Appendix B. On August 5, 2003, Gettler personnel began excavation activities with the removal of the pea gravel fill material around the tank. The excavated fill was placed on plastic adjacent to the excavation. On August 7, 2003, in preparation for removal, Gettler personnel placed 300 and 150 pounds of L,, dry ice inside the gasoline and diesel compartments of the tank, respectively. After approximately 40 minutes, the lower explosive limit(LEL)and percent oxygen were measured Lawithin both tank compartments. In the gasoline compartment, LEL was recorded at 0%and percent oxygen was measured at 8%. In the diesel compartment, LEL was recorded at 0% and percent oxygen was measured at 3%. Upon authorization from the SJCFD, the tank was removed from the excavation. Following removal, the tank was inspected for signs of deterioration, holes, or leakage. With the exception of two small fractures in the fiberglass coating that did not appear to affect the integrity of the UST, the tank was observed to be in good condition. The tank and associated piping were then transported by Ecology Control Industries i• to their facility in Richmond, California for disposal under manifest number 22490657. A copy of the hazardous waste tank closure certification is included in Appendix C. Copies of the manifest and certificate of destruction for transport and disposal of the tank and associated piping are presented in Appendix D. Soils encountered within the excavation consisted of medium brown sandy soil. No soil discoloration or petroleum hydrocarbon odors were observed during excavation activities. ` Groundwater was not encountered in the excavation. CNCD110-7-0310:SHAREWS7103-0122.doc 2 t...