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2.0 UST Removal Field Activities <br /> 1 2.1 Tank Removal <br /> ' On April 26, 2002, TAIT personnel began excavation activities with the removal of the pea <br /> gravel fill material around the tank. The fuel conveyance piping was then disconnected from the <br /> UST and the building. The piping was observed to be in good condition without any holes or <br /> ' cracks. The tank contents (diesel fuel)had been removed prior to excavation activities. <br /> Excavated fill was placed on plastic adjacent to the excavation. <br /> ' On April 29, 2002,the UST was triple rinsed by Ecology Control Industries (ECI)personnel <br /> using a fresh water/detergent mixture and a hot water pressure washer. Following rinsing, visual <br /> inspection of the tank did not indicate any residual sludge or liquid on the visible portions of the <br /> ' interior of the tank. Approximately 200 gallons of rinsate was removed from the tank using a <br /> vacuum truck. The rinsate was then transported for disposal, under manifest number 21395020, <br /> to Romic Environmental in East Palo Alto, California. A copy of the manifest for the rinsate is <br /> included in Appendix B. <br /> Following completion of the rinsing activities, approximately 100 pounds of dry ice were placed <br /> inside the tank in preparation for removal. After approximately 15 minutes, the lower explosive <br /> limit and percent oxygen were measured to be below 10%. Upon authorization from Mr. Dennis <br /> Catanyag of the SJCE) D, the tank was removed from the excavation. Following removal, the <br /> ' tank was scraped of exterior soil and inspected for signs of deterioration, holes, or leakage. The <br /> tank was observed to be in good condition, without any holes or cracks. The tank was then <br /> transported to ECI's facility in Richmond, California for disposal under manifest number <br /> 21080319. A copy of the tank closure certification is included in Appendix C. A copy of the <br /> ' manifest and certificate of destruction for transport and disposal of the tank is presented in <br /> Appendix D. <br /> Soils encountered within the excavation consisted of a dark brown silty clay and sand. No soil <br /> discoloration or petroleum hydrocarbon odors were observed during excavation activities. <br /> Groundwater was not encountered within the excavation. <br /> CNCD\06-25-02\SHARE\UM02-0057.doc <br /> ' 2 <br />