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1 <br /> GeoStrategies Inc. <br /> Unocal Corporation <br /> October 7, 1992 <br /> Page 2 <br /> Ground-water samples were collected on July 30, 1992 Samples were <br /> analyzed for Total Petroleum Hydrocarbons calculated as Gasoline (TPH- <br /> Gasoline) according to EPA Method 5030 and for Benzene, Toluene, <br /> Ethylbenzene and Xylenes (BTEX) according the EPA Method 8020 <br /> These ground-water samples were analyzed by National Environmental <br /> Testing (NET) Pacific Inc , a California state certified laboratory located <br /> in Santa Rosa, California A trip blank was also analyzed for TPH- <br /> Gasoline and BTEX according to the same EPA methods Detectable <br /> concentrations of BTEX were reported in the trip blank This is <br /> attributed to laboratory error and is described in the laboratory <br /> analytical report Ground-water samples collected on July 30, 1992 <br /> were analyzed for Total Coliform and Fecal Coliform These ground- <br /> water samples were analyzed by Sequoia Analytical, a California state- <br /> certified laboratory, located in Redwood City, California The laboratory <br /> analytical reports and Chain - of - Custody forms are presented in <br /> Appendix B TPH-Gasoline and BTEX data are presented in Table 2 A <br /> chemical concentration map for benzene is presented on Plate 4 <br /> Ground-water sampling field methods and procedures are included in a <br /> previous GSI report dated August 4, 1992 <br /> 1 <br /> i <br /> I� <br /> 785501-2 <br />