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Mr. Charles Miller,USA Gasoline Corporation November 6,2006 <br /> Baseline Site Investigation Report Project No.2007-3502-01 <br /> USA Station No.3502, Lodi, California <br /> Page 3 <br /> Analytical Methods <br /> Soil samples were forwarded to Alpha Analytical, Inc., a California state-certified <br /> laboratory (ELAP #2019), for chemical analysis under strict chain-of-custody procedures. <br /> The samples were analyzed for gasoline range organics (GRO) using USEPA Method <br /> SW8015B DHS/LUFT Manual, and for benzene, toluene, ethylbenzene, and xylenes <br /> (BTEX), methyl tertiary butyl ether (MTBE), tertiary amyl methyl ether (TAME), tertiary <br /> butyl alcohol (TBA), ethyl tertiary butyl ether (ETBE), and di-isopropyl ether (DIPE) using <br /> USEPA Method SW8260B. Soil analytical results are presented in Table 1. Certified <br /> analytical reports with chain-of-custody records are presented in Appendix B. <br /> FINDINGS <br /> Site Geology <br /> Sandy silt and silty sand mixtures were generally observed between surface grade and <br /> approximately 20 to 25 feet bgs. An interval of clay and silt, approximately 6 to 13 feet in <br /> thickness, was observed beneath the shallow sandy silt/silty sand material. Sandy soils <br /> were predominately observed in the northern portion of the site at borings B-3 and B-4 <br /> from approximately 33 to 50 feet bgs, the maximum depth explored at the site. This sandy <br /> interval appears to thin towards the southern portion of the site, with fine grained soils <br /> underlying these sandy strata from approximately 43 to 50 feet bgs at borings B-1 and B-2. <br /> Groundwater was not encountered during the investigation. <br /> Soil Analytical Results <br /> Petroleum hydrocarbon and fuel additive concentrations were not reported above <br /> laboratory detection limits in any of the soil samples collected during this phase of <br /> investigation. <br /> SUMMARY <br /> The following summarizes the findings of the investigation: <br /> • Interbedded sand and fine grained soils were observed between surface grade and <br /> approximately 50 feet bgs. <br /> • Groundwater was not encountered during the investigation. <br /> • Concentrations of petroleum hydrocarbons and fuel additives were not reported <br /> above laboratory detection limits in any of the soil samples. <br /> KAUSA Gaso1ine\3502\Reports\USA 3502-baseline assessment report.doc -5 TKA TUS <br />