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Gettler-Ryan/Geostratgpes(1) Prouect Tosco(1) -6747 Sierra Court,Suite 7- - ProjectNtimtber=Tosco(Unocal)SS#6981= _ _ = Rtnonea_ _ _ Dublin CA,94568 Prof Mann- Deanna Harding 07/12/0106 51 Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B Sequoia Analytical- San Carlos Reporting Andyto Rech Luart units Dihi4on Batch Prepared Anah—d Modiod Notm MW-14(1.106220-11)Water Sampled 06/26/0117:50 Received.06/28/0107:50 Ethanol ND 1000 ug/1 1 1070022 07/05/01 07/06/01 EPA 8260B 1,2-Dibromoethane ND 20 " 1,2-Dichloroethane 36 20 Di-isopropyl ether ND 20 " Ethyl tert-butyl ether ND 20 " Methyl tert-butyl ether 120 20 Tert-amyl methyl ether ND 20 Tert-butyl alcohol ND 100 " Surrogate 1,2-Dtchloroethane-d4 830% 76-114 " Surrogate Toluene-d8 990% 88-110 " MW-15(L106220-12)Water Sampled 06/26/0117:15 Received-06/28/0107 50 Ethanol ND 1000 uFA 1 1070022 07/05/01 07/06/01 EPA 8260B . 1,2-Dibromoethane ND 20 " 1,2-Dichloroethane ND 20 " Di-isopropyl ether ND 20 Ethyl tert-butyl ether ND 20 Methyl tert-butyl ether 24 20 Tert-amyl methyl ether ND 20 n Tert-butyl alcohol ND 100 " Surrogate 1,2-Dichloroethane-d4 836% 76-114 Surrogate Toluene-d8 968% 88-110 " MW-16(L106220-13)Water Sampled.06/27/0113 00 Received:06128/0107:50 Ethanol ND 5000 ug/l 5 1070023 07/05/01 07/05/01 EPA 8260B 1,2-Mbromoethane ND 10 " 1,2-Diehloroethane ND 10 Di-isopropyl ether ND 10 Ethyl tert-butyl ether ND 10 Methyl tert-butyl ether 150 10 Tert-amyl methyl ether ND 10 Tert-butyl alcohol ND 500 Surrogate 1,2-Dichloroethane-d4 936% 76-114 Surrogate Toluene-d8 102% 88-110 " Sequoia Analytical-Sari Carlos The results in this report apply to the samples analyzed in accordance with the c halW custody document This analytical report must be reproduced in its enurety Page 11 of 22