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1 - <br /> GeoStrategies Inck <br /> Unocal Corporation. <br /> October 2, 1992 <br /> Page-2 . <br /> Ground-water :.samples were collected o.n AUgust 6, 1992. Samples <br /> were :analyzed -for Total -Petroleum .Hydrocarbons calculated as Gasoline <br /> (TPH-Gasoline); according to. EPA .Method 5030, for- Benzene, Toluene, <br /> Ethylbenzene Xylenes` (BTEX): according :to EPA Method 8020, and for <br /> Total Petroleum :Hydrocarbons calculated as Diesel; (TPH - Diesel) <br /> i according to EPA, method.- 3510. The ground-water, samples I were <br /> l analyzed- by National Environmental Testing (NET) Pacific, .a California . <br /> f y State-certified laboratory =located in Santa. 'Rosa; California. A trip blank <br /> was .also analyzed f&1:TPH=Gasoline -and :BTEX according to the : same <br /> EPA methods. Detectable. concentrations of. BTEX were reported' in the <br /> trip blank analsis.-'This, is .attributed to 'laboratory error as described in <br /> the laboratory','analytical: report.' The laboratory analytical , report and <br /> Chain-of-Custody form _-are°, included " in Appendix . These data,, are <br /> summarized .and " included with.. the historical �chemical analytical . data <br /> _ presented.! .in Table 2 A chemical: concentration, map, for benzene is <br /> presented .on.., ..Plate 4 Groundwater sampling field methods and <br /> procedures areincluded in _a previous GSI report dated `July 10, 1992. <br />; . . <br /> j if you have.any questions, please :call. <br /> GeoStrategies.'ln`c.. by; A <br /> ::Ellen.C. Fostersmiti . <br /> Geologist <br /> . r , <br /> QOFEssrnyq 4 �o t <br /> LUNE <br /> Diane M: l-undqui. P E <br /> I Senior Engineer._ oCP* rn <br /> C 46725 <br />` NO:046125 . <br />} ECF/DML/rmt x CIV <br /> .OF CAl1E�4\ <br /> 78460:1-2- <br />