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Underground Storage Tank Rem*and Assessment • Sears Unit, #0555, Tracy, California UST system removal activities were performed by Three Kings on December 20 and 21, 2004. Three Kings personnel excavated soil from the top, front,and sides of the UST to expose the UST. Once the soil was excavated,Evergreen Environmental(under direct sub-contract to Sears)drained approximately 95 gallons of remaining waste oil with a vacuum pump truck for disposal as non-hazardous waste at a ' licensed facility. ' Mr. Catanyag of the SJCEHD performed an inspection of the existing in-ground tank condition, and recorded the oxygen and lower explosive levels(LEL)at the mouth of the fill port. The oxygen levels ' were recorded at 20 parts per million(ppm) and the LEL was at 0.0%,both acceptable ranges. The UST and associated piping were then removed from the excavation(UST excavation measuring 9 feet x 14 feet and completed to a depth of approximately 10 feet bgs and piping excavation measuring 2.5 feet x 19 feet and completed to a depth of approximately 3.5 feet bgs),and a description of the tank condition was recorded. MACTEC collected soil assessment samples from immediately under the UST, piping,and stockpiled soil and submitted them for analysis. All piping associated with the UST was ' evacuated and removed. ' The UST system was loaded onto a flatbed truck and taken to Western Columbia Resources Company in Vancouver,Washington for decommissioning. UST system component disposal documentation is included in Appendix A. The excavated soil was used to backfill the excavation and clean import soil was added to complete the backfill. The area was then compacted,and an approximate three-inch asphalt layer was installed to fmish the excavation surface on January 13,2005. Excavation dimensions are included in Figure 3,and photographic documentation is included in Appendix C. 3.3 Field Observations The UST and associated piping appeared to be in very good condition,and no evidence of release was apparent. The oil pump located in the warehouse building was operational and in good condition. Three Kings personnel detached the pump from the piping prior to pipe removal. 1 4 MACTEC Engineering and Consulting, Inc.