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i� :7 I C r u [i 'i 0 C! C' u G 11 interior of the tank. Approximately 150 gallons of rinsate were removed from the tank using a vacuum truck. The rinsate was then transported for disposal, under manifest number 22800354 to Romic Chemical Corporation in East Palo Alto, California. A copy of the manifest for the rinsate is included in Appendix B. On April 8, 2004, Gettler Ryan placed 50 pounds of dry ice inside of the diesel tank. After approximately 1 hour, the lower explosion limit (LEL) and percent oxygen were measured within the tank. Both the LEL and percent oxygen were measured to be below 10%. Upon authorization from Mr. Raymond von Flue of the SJC-EHD, 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. A copy of the hazardous waste tank closure certification is included in Appendix C. A copy of the hazardous waste manifest and certificate of destruction for disposal of the tank and associated piping is presented in Appendix D. No petroleum hydrocarbons odors or discoloration were noted within the in-situ or excavated soils. Groundwater was not encountered within the excavation. 2.2 Sampling Activities On April 8, 2004, following removal of the UST, Shaw personnel collected soil samples from the tank excavation and piping trench under the direction and supervision of Mr. Raymond von Flue of the SJC-EHD. One soil sample, labeled TP -1-9, was collected from the base of the tank excavation at a depth of approximately 9 feet below surface grade (bsg), two feet into native soil. The soil samples were collected by pushing a sample tube into the soil, collected using the bucket of the backhoe, until full. Three soil samples, labeled PL -01-2, P1-02-2, and PL -03-2.5, were collected from beneath the former fuel piping line at depths of approximately 2 to 2.5 feet. The pipeline soil samples were collected by hand-augering approximately 2 to 2.5 feet into native soil and using a slide hammer lined with a brass sample tube for collection. In order to evaluate soil disposal options, one 4 -point composite soil sample, labeled CS (01-04), was collected by pushing sample tubes into four random bucket loads of soil during direct loading. CNCD\O:SHAMUS'nO4-0097.doc 2