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Rf mlcl-�-lfRNfR Mr. Charles Leubner 20 January 1997 Page 2 All of the tanks were removed by the following general procedures: Product in the pipelines was drained into the tanks prior to cutting piping associated with the tanks. Soil over the top 1/3 of the tanks was excavated prior to their removal from the excavation. Gasoline tanks were rinsed using high pressure water and the rinsate was transported to the Demenno/Kerdoon facility in Compton, California by Ramos Environmental Services. The diesel tanks were not rinsed prior to their removal. Dry ice was added to the tanks to create an inert atmosphere before they were removed from the excavation. The tanks were removed from the excavations only after regulatory agency staff monitored the oxygen and lower explosive limit (LEL) in the tank and determined they were at acceptable levels. Following their removal, the tanks' exterior was inspected by the San Joaquin County Environmental Health Division representative to determine if corrosion or holes were evident. The tanks were transported on flat bed trucks for disposal at the Erickson, Inc. facility in Richmond, California. The tanks were marked with identification numbers prior to leaving the site. Copies of manifests for the materials transported from the site for disposal are included in Attachment A. Deviations from these general procedures are noted in the discussions presented below. REMOVAL OF DIESEL TANKS Excavation of Tanks The asphalt over the three diesel tanks was removed and soil was excavated from the sides of the three diesel tanks on 23 December 1996. This soil was stored adjacent to the excavation on and covered with plastic sheeting (see Figure 2). Due to the long pipe run connecting the tanks to the fuel dispensers, the work plan for the removal of the tanks included blowing product that remained in the pipelines back into the tanks with compressed air prior to cutting the pipelines. Because the pump turbine had been removed from tank T6, diesel product was inadvertently blown out of the turbine casing located at the southern end of Tank T6. Most of the diesel product was reported to have been blown into the tank excavation.