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URS Page 7 Ms Margaret Lagorlo San Joaquin County Environmental Health Department June 27, 2003 2002 UST Removal One split (10,000-gallon and 12,00-gallon) gasoline UST and one 20,000-gallon gasoline UST were removed from the site on October 22, 2002 USTs appeared tobe mgoocondition,00 The associated ing nid excavated with no apparent spensers had been previously removed on August 15, 2002 The holes or cracks noted during the removal activities (URS,2002) Six soil samples were collected from the bottom of the UST pit at the north, center, and south portions of each former UST location The tank pit was approximately 18 feet bgs The tank samples were collected by pushing a brass tube into a fresh backhoe bucket of soil One soil sample was collected beneath each of the four dispensers Three soil samples were collected beneath the product lines at llected approximately 5 feet bgs The dispenser collect d from gsampls he one-site ere so 1 ostockpilesiThe long at or de ofetheFso 1 ur composite soil samples were also samples is shown in the figure in Attachment H Soil samples were analyzed for TPHg by U S EPA Method 8015, BTEX, and MtBE by EPA Method 8021, and fuel oxygenates (TBA, MtBE, DIPE, TAME, ETBE, EDB, and 1,2-DCA) by EPA Method 8260B Soil stockpile samples were also analyzed for total lead by EPA Method 6000/7000 Series Methods No analytes were detected at or above reporting limits in the seven soil samples collected from below the dispenser islands and the piping No analytes were detected at or above reporting limits in the six soil of th the exception samples collected from the bottom he results of confirmation soil samples ples are presented in At chme t which Has reported at 16 mg/kg in PB Because impacted soil was not observed in the UST excavation and stockpile sample results did not identify analytes at or above reporting limits,the excavated soil was used to backfill the tank pit SOIL IMPACTS SUMMARY As of October 2002, all USTs,piping, and dispensers have been removed from the site During the 1999 UST upgrade, impacted soils identified in the tank pit were overexcavated to allow for installation of new tanks Only low levels of fuel-related constituents have been identified in the soil remaining at the site TPHg was reported at concentrations up to 1,170 mg/kg at 5 feet bgs (although the 6-foot bgs sample was below reporting limits), ethylbenzene was reported in one sample at 0 00632 mg/kg, xylenes were detected at a maximum of 19 3 mg/kg, and MtBE was detected up to 0 560 mg/kg to a 4-foot bgs the method on removal sample No benzene or toluene detect anydetected constituent aat or boore above the methodidetect�on hmik with the activities from 2002 did no exception of one TBA detection (1 6 mg/kg at 18 feet bgs) K 1WprocessV5 BP ARC0100434\Closure RequesAStatton 434 Closure Doc doc