ARCHIVED REPORTS_XR0005829 CASE 1

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Mr Michael Infurna Proaect 20805-151-004 August 25, 2000 Page 5 Pinnacle submitted discreet stockpile samples SP-1 through SP-10 to CAS and composite stockpile samples SP-1, SP-2, and SP-11 through SP-18 to Sequoia, with appropriate chain-of-custody documentation The stockpile samples were composited in the laboratory four to one, with the exception of the 10 discrete samples (SP-1 through SP-10, and composite sample SP-2 which was composlted two to one), and analyzed for 1 TPHG and using USEPA Method 8015M, and for BTEX using USEPA Method 8020 Samples SP-2 (composite), SP-14 and SP-16 were also analyzed for volatile organic compounds using USEPA Method 8010 In addition, stockpile samples SP-1 through SP-10 and SP-17 were analyzed for oxygenates (TBA, MTBE, DIPS, ETBE, and TAME) using USEPA Method 8260, and samples SP-11, SP-12, and SP-13 were analyzed for MTBE using DHS/LUFT Impacted stockpiled soil was transported by Dillard Trucking, Inc , of Byron, California, to Browning Ferris Industries Vasco Road Sanitary Landfill, in Livermore, California, for disposal Appendix A contains stockpiled soil disposal manifests ANALYTICAL RESULTS This section presents the results of the UST water sample results and soil sampling from the gasoline USTs, dispensers, product delivery lines, and vent lines and stockpiled soil Soil samples collected from the UST complex at 16 feet bgs were confirmation samples and samples collected from 17 feet bgs were overexcavatlon samples ' Rinseate Water Samples Rmseate water samples collected from inside the USTs, prior to removal, contained MTBE concentrations ranging from 180 micrograms per liter (mg/1) to 310 mg/l No other analytes were detected Analytical results are summarized in Table 1 Certified analytical reports and chain-of-custody documentation are presented in Appendix B UST Confirmation Samples (16 feet bgs) Soil sample T-3-M, collected at 16 feet bgs, contained a TPHG concentration of 0 1 milligrams per kilogram (mg/kg) Six of the eight samples collected at 16 feet bgs contained concentrations of TBA ranging from 0 46 mg/kg to 100 mg/kg, and seven of the eight samples contained concentrations of MTBE ranging from 0 012 mg/kg to 5 0 mg/kg Seven of the eight confirmation samples did not contain TPHG, and BTEX was not detected in any of the samples Analytical ' results are summarized in Table 1 Certified analytical reports and chain-of-custody documentation are presented in Appendix B SAC\\\SACRFP1\COMMON\Consulting\data\Shared\Projects\PJO\0805\08051510 4zz doe-00\A 1 (804141 00008)