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The groundwater samples collected on August 27, 2004 were transported in an iced cooler with chain-of-custody documentation to Kiff Analytical, LLC (Kiff), a state of California certified hazardous waste testing laboratory (Certification #2236) Kiff analyzed each of the groundwater samples for TPH-as-gasoline, benzene, toluene, ethylbenzene, and xylenes (BTEX), methyl tertiary butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl tertiary butyl ether(ETBE), tertiary amyl methyl ether (TAME), tertiary butanol (TBA) and 1,2-DCA by EPA Method 82608 The analytical results from the August 27, 2004 groundwater sampling event indicated that TPH- as-gasoline and BTEX compounds were detected at MW-1 and MW-3 The sample collected from MW-2 did not contain detectable concentrations of petroleum hydrocarbons, and the five oxygenate compounds and 1,2-DCA were not detected in any of the groundwater samples TPH- as-diesel was not analyzed The distributions of TPH-as-gasoline and benzene are shown on isoconcentration maps (Figures 5 and 6) The groundwater samples collected on December ecember 29, 2004 were transported in an iced cooler with chain-of-custody documentation to Excelchem Environmental Labs (Excelchem), a state of California certified hazardous waste testing laboratory (Certification#2119) Excelchem analyzed each of the groundwater samples for TPH-as-diesel, TPH-as-gasoline and BTEX by EPA Method 8020/8015M, and for MTBE, DIPE, ETRE, TAME, TBA, and 1,2-DCA by EPA Method 82606 The analytical results from the December 29, 2004 groundwater sampling event indicated that TPH-as-diesel, TPH-as-gasoline and BTEX compounds were detected in all three monitoring wells The five oxygenate compounds and 1,2-DCA were not detected in any of the groundwater samples The distributions of TPH-as-diesel, TPH-as-gasoline and benzene are shown on isoconcentration maps (Figures 7, 8 and 9) 8