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Gettler-Ryan/Geostrategies(1) Project: Tosco(1) 6747 Sierra Court,Suite J Project Number: Unocal SS#11195 Reported: Dublin CA,94568 Project Manager. Deanna Harding 02/26/01 14:46 Volatile Organic 8 Oxyganated Compounds by EPA Method 8260B Sequoia Analytical-San Carlos Reporting Analyte Result Limit Units DilutionBatch Prepared Analyzed Method Not= MW-8(L102061-08)Water Sampled:02109/0111:05 Received:02109/0118:05 Ethanol ND 1000 ugll 1 1020033 02/13/01 02/13/01 EPA 8260B 1,2-Dibromoethane ND 2.00 " 1,2-Dichloroethane ND 2.00 " Di-isopropyl ether ND 2.00 " Ethyl tert-butyl ether ND 2.00 Methyl tert-butyl ether 43.0 2.00 " Tert-amyl methyl ether ND 2.00 Tert-butyl alcohol ND 100 Surrogate:1,2-Dichloroethane-d4 105% 76-114 Surrogate:Toluene-l8 98.8% 88-110 " MW-9(L102061-09)Water Sampled:02/0910110:32 Received:02/09/0118:05 Ethanol ND 1000 ug/1 1 1020033 02/13/01 02/13/01 EPA 8260E Dibromoethane ND 2.00 "r Dichloroethane ND 2.00 " Di-isopropyl ether ND 2.00 ^ , Ethyl tert-butyl ether ND 2.00 Methyl teat butyl ether ND 2.00 Tert-amyl methyl ether ND 2.00 Tert-butyl alcohol ND 100 " Surrogate:1,2 Dichloroethane-d4 109% 76-114 " Surrogate:Toluene-d8 99.8% 88-110 " MW-10(L102061-10)Water Sampled:02/09/0110:00 Received:02/0910118:05 Erol ND 200000 u9/1 200 1020033 02/13/01 02/13/01 EPA 8260B 1,2-Dibromoethane ND 400 1,2-Dichloroethane ND 400 Di-isopropyl ether ND 400 „ Ethyl tert butyl ether ND 400 " Methyl tert-butyl ether 37100 400 Tert-amyl methyl ether ND 400 „ Tert-butyl alcohol ND 20000 " Surrogate:1,2 Dichloroethane-d4 109% 76-114 Surrogate:Toluene-d8 100% 88-110 " i l teduol3 ArmilyriCal-San Carlos The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety. Page 9 of 18