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♦ h� <br /> Sequoia 404 N ,CA Lane <br /> Walnut Creek,CA 94598 <br /> — 6 (925)988-9600 <br /> Analytical FAX(925)988-9673 <br /> Gettler Ryan,Inc -Dublin Project Tosco <br /> 6747 Sierra Court Suite J Project Number Tosco(Unocal)#6981 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 23-Nov-99 16 42 <br /> Volatile Organic Compounds by EPA MRhod 8260A - - - -- <br /> - - - - -Sequoia Analytical -Walnut Creek <br /> Reporting <br /> Analyte Result Lutut Uruts Dilution Batch Prepared Analyzed Method Notes <br /> MW-5(W910568-05)Water Sampled 26-Oct-9914 15 Received 27-Oct-99 13 50 <br /> tett-Butyl alcohol ND 100 ug/1 1 9K08019 04-Nov-99 06-Nov-99 EPA 9260A <br /> Methyl tent-butyl ether 13 20 " I. " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 " <br /> tent-Amyl methyl ether ND 20 " <br /> Surrogate Dibtomofluoron:ethane 106% 50-150 " <br /> Surrogate 1,1-Dzchloroethane-d4 102 % 50-150 " <br /> MW-6(W910568-06)Water Sampled 26-Oct-9912 20 Received 27-Oct-99 1350 <br /> tert-Butyl alcohol ND 100 ug/l 1 9KO8019 04-Nov-99 06-Nov-99 EPA 8260A <br /> Methyl tert-butyl ether 27 20 " <br /> Ds-tsopropyl ether ND 20 " <br /> Ethyl tent-butyl ether ND 20 " <br /> tert-Amyl methyl ether ND 20 " <br /> Su»agate Drbromofluoromethane 106% 50-150 . <br /> Surrogate 1,2-D¢chlozoethane-d4 102 % 50-150 <br /> MW-7(W9I0568-07)Water Sampled 26-Opt-99 15 00 ReCelved 27-Oct 99 13 50 <br /> tert-Butyl elc.ohol ND 200 ug/1 2 9KO8019 04-Nov-99 06-Nov-99 EPA 8260A <br /> Methyl tort-butyl ether 250 40 " <br /> Di-c5opropyl ether ND 40 " <br /> Ethyl cert-butyl ether ND 40 " <br /> tert-Amyl methyl ether ND 40 <br /> Sutrogate Drbtotuofluotomethane 106% 50-150 " <br /> Sutrogate 1 2-Dichloroellrane-d4 102% 50-150 " <br /> SegWia Analytical- Walnut Creek The reswkv in thrs report apply to the moriples analysed to accordcmce with the chain o <br /> cuuody document Thty analytical report mu st be reproducedin r a entire <br /> J e Heg ey, roject M nkgVr Page 9 of 19 <br />