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r <br /> • 27 September 1999 <br /> AGE-NC Project No 95-0167 <br /> Page 6 of 9 <br /> F <br /> into three chilled 40-m1 volatile organic analysis (VOA) vials containing 0 5 ml 18% HCL as a <br /> sample preservative After collection, the samples were labeled and placed in a chilled container for <br /> transportation under chain-of-custody to McCampbell Analytical, Inc (MAI), a California <br /> Department of Health Services (DHS)-certified analytical laboratory located in Pacheco, California <br /> Each sample was analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline and as diesel (TPH-g and TPH-d) by <br /> EPA Method 8015 Modified for each range of hydrocarbons, <br /> • Volatile aromatic compounds (benzene, toluene, ethylbenzene and total xylenes BTEX) by <br /> EPA Method 8020, and <br /> • Oxygenated compounds, di-isopropyl ether(DIPE),ethyl tertiary butyl ether(ETBE),methyl <br /> tertiary-butyl ether(MTBE),tertiary amyl methyl ether(TAME)tertiary butyl alcohol (TBA) <br /> by EPA Method 8260 Modified <br /> Ground water depth, flow direction, and gradient findings are presented in Section 4 4 The results <br /> of the ground water sample laboratory analysis are presented in Section 4 3 <br /> 5 0. FINDINGS <br /> Soil in the area east of well MW-I was found to contain petroleum hydrocarbons at depths of fifteen <br /> and to less concentrations at thirty feet and thirty-five feet, bsg Ground water was inferred to have <br /> a northerly flow direction and was found to be Iocally impacted by petroleum hydrocarbons and <br /> oxygenated fuel additives <br /> 51 STRATIGRAPHY <br /> Tan and brown silty clay was encountered in soil samples collected from surface grade to depths of <br /> approximately ten feet bsg Sand was encountered below the silty clay, generally from depths of 10 <br /> to approximately 30 feet bsg A gravel layer was encountered at a depth of 30 feet bsg A silty clay <br /> was encountered at a depth of 35 feet bsg in soil boring MW-1 Soil boring logs are depicted in <br /> Appendix A <br /> 52 LABORATORY RESULTS OF SOIL SAMPLES <br /> . TPH-g was detected in one of the twelve soil samples analyzed (MW I-15) at a concentration of 990 <br /> milligrams per kilogram (mg/kg) BTEX compounds were also detected in the same soil sample at <br /> Ad►anced 6coEn\ironmental,Inc <br />