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' Underground Storage Tank Systjoemoval and Assessment • Sears Unit#0555, Tracy, California ' 4.0 CONCLUSIONS Based on the data presented in this report,the following conclusions can be made: • One 750-gallon UST system was removed from the north side of the Orchard Supply warehouse building. ' • The TFD and SJCEHD approved and signed permits for the UST system removal and both the TFD and the SJCEHD oversaw removal of the UST system and piping. ' • Approximately 95 gallons of waste oil(non-hazardous waste)was pumped from the UST and properly disposed of prior to removal. • No visual impact was evident during the UST system removal and the UST was observed to be in ' very good condition. • Six soil samples(three soil samples collected from the floor beneath the former UST; one sample collected beneath the former tank piping; and two soil stockpile samples)were analyzed for TPH, TRPH,VOCs, SVOCs, and metals. With the exception of diesel and motor oil range organics and TRPH detected below the state screening level for TPH and TRPH of 100 mg/kg in the piping stockpile(sample#0452SS003 at concentrations of 10,28,and 68 mg/kg respectively), and metals detected in all six soil samples at concentrations below each California TTLC reference value,the constituents of concern were not detected above the laboratory lower quantitation limit. • All excavated soil was returned to the excavation and clean import soil was added to complete the backfill. • The excavation was returned to pre-existing conditions with the application of an approximate three-inch thick asphalt resurface. 1 1 6 MACTEC Engineering and Consulting, Inc.