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RfIMICXf[fRNFR <br /> t <br /> Mr. Charles Leubner <br /> 20 January 1997 <br /> Page 2 <br /> 1 All of the tanks were removed by the following general procedures: <br /> 1 <br /> I <br /> Product in the pipelines was drained into the tanks prior to cutting piping associated <br /> with the tanks. <br /> Soil over the top 113 of the tanks was excavated prior to their removal from the <br /> excavation. <br /> .1 Gasoline tanks were rinsed using high pressure water and the rinsate was <br /> transported to the Demenno/Kerdoon facility in Compton, California by Ramos <br /> Environmental Services. The diesel tanks were not rinsed prior to their removal. <br /> Dry ice was added to the tanks to create an inert atmosphere before they were <br /> >a removed from the excavation. <br /> The tanks were removed from the excavations only after regulatory agency staff <br /> monitored the oxygen and lower explosive limit(LEL)in the tank and determined <br /> 1 they were at acceptable levels. <br /> Following their removal,the tanks' exterior was inspected by the San Joaquin <br /> County Environmental Health Division representative to determine if corrosion or <br /> holes were evident. <br /> The tanks were transported on flat bed trucks for disposal at the Erickson,Inc. <br /> r=-= facility in Richmond, California. The tanks were marked with identification <br /> numbers prior to leaving the site. <br /> Copies of manifests for the materials transported from the site for disposal are included in <br /> Attachment A. Deviations from these general procedures are noted in the discussions presented <br /> below. <br /> REMOVAL OF DIESEL TANKS <br /> Excavation of Tanks <br /> r-- <br /> The asphalt over the three diesel tanks was removed and soil was excavated from the sides of the <br /> three diesel tanks on 23 December 1996. This soil was stored adjacent to the excavation on and <br /> Ij <br /> covered with plastic sheeting (see Figure 2). <br /> Due to the long pipe run connecting the tanks to the fuel dispensers, the work plan for the removal <br /> of the tanks included blowing product that remained in the pipelines back into the tanks with <br /> compressed air prior to cutting the pipelines. Because the pump turbine had been removed from <br /> tank T6, diesel product was inadvertently blown out of the turbine casing located at the southern <br /> end of Tank T6. Most of the diesel product was reported to have been blown into the tank <br /> �` excavation. <br />