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Report of Closure Activities 3 Barbara Drake,26485 North Thomton Road,Thornton,Caldomia April 16,1998 total xylenes (BTEX),total petroleum hydrocarbons-as-gasoline (TPH-g), and methyl tent-butyl ether (MTBE) by EPA Methods 8020/8015 modified In addition,samples were analyzed for total petroleum hydrocarbons-as-diesel (TPH-d)with silica-gel cleanup using EPA Method (modified) 8015, and total lead using EPA method 6010 24 Excavation Backfill During the period January 5-12, 1998, Fluor Daniel GTI supervised WA Craig in performing the backfilling of the former UST excavation Concrete debris originating from UST removal activities was removed from the site by W A Craig Backfill activities were conducted in compliance with requirements set forth by the CCDD Although the bottom of the excavation was dry at the time of backfill activities, imported 314-inch-minus gravel was used to backfill the excavation to a depth of approximately 4 feet bgs A GeoTextile fabric was laid in the excavation over the top of this gravel to enhance stability of backfill materials An additional deposit of 314-inch-minus gravel was deposited on top of the fabric to a depth of approximately 1 5 feet bgs Because soil stockpile analytical results indicated concentrations of petroleum hydrocarbons below minimum detection levels, soil from the stockpiles was used,with concurrence from the PHS/EHD,to complete the backfill of the excavation from the top of the gravel to the surface Due to rain, final soil compaction testing was postponed until drier weather On February 27, 1998,the final compaction and testing were performed by W A Craig Residual stockpile soil was graded at the site One empty and three full purge water drums originating from historic water sampling activities were removed from the site on March 5, 1998, by Integrated Wastestream Management, Inc of Milpitas 30 RESULTS OF FIELD ACTIVITIES 31 Well Abandonment Overdrill and Soil Stockpile Sampling Table 1 summarizes the laboratory analytical results for well abandonment overdrill and stockpile soil samples collected on September 19, 1997 Total xylenes were detected in sample SP3-2A at a concentration of 0 0061 milligrams per kilograms (mg/kg, equivalent to parts per million, or ppm) Total lead was detected in seven samples,with a maximum concentration of 25 ppm in sample SP3-2A All lead concentration levels detected were below the State of California Maximum Contaminant Level (MCL) action levels for lead in water(50 parts per billion) (California Department of Health Services, 207W5i2.CLO FLUOR DANIEL GTI CJ