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*... a ,. On September 15, 2004,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 (diesel fuel)had been removed prior to 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 300 gallons of rinsate were removed from the tank using a vacuum truck. The rinsate was then transported for disposal, under manifest number 23570865 to Romic Chemical Corporation in East Palo Alto, California. A copy of the manifest for the rinsate is included in Appendix B. On September 16, 2004,TAIT placed 150 pounds of dry ice inside of the diesel tank. After approximately I hour, the lower explosion limit(LEL) and percent oxygen were measured within the tank. LEL was recorded at 0% and percent oxygen was recorded at 7.4% inside of the tank. Upon authorization from Ms. Michelle Le of the SJCEHD, the tank was removed from the excavation. Following removal, the tank was inspected for signs of deterioration, holes, or leakage. The tank was observed to be in good condition, without any holes or cracks. The tank and associated piping were then transported by ECI to their facility in Richmond, California for disposal under manifest number 23570872. A copy of the hazardous waste tank closure certification is included in Appendix C. A copy of the manifest and a copy of the certificate of destruction for transport and disposal of the tank and associated piping are presented in Appendix D. No petroleum hydrocarbon odors or discoloration were noted within the in-situ or excavated soils. Groundwater was not encountered within the excavation. 2.2 Sampling Activities On September 16,2004,following removal of the UST, Shaw personnel collected one soil sample from the tank excavation under the direction and supervision of Ms. Michelle Le of the SJCEHD. The excavation soil sample,labeled TP-01(11'), was collected from the bottom of the tank excavation at a depth of 11 feet below surface grade(bsg) and 2 feet into native soil. The soil sample was collected by pushing a sample tube into the soil, collected using the bucket of the backhoe, until full. crrcow:sxARMUSW"222.d« 2