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Lane Sequoia 404N wA 94598 Walnut Creek,CA 94598 Analytical ID (925)988-%73 FAX(916)986-9673 y %07www sequoialabs can Gettler Ryan,Inc -Dublin Project Unocal 6747 Sierra Court Suite J Project Number Unocal#2859 Reported: Dublin CA,94568 Project Manager Deanna L Harding 07-Dec-01 08 14 Volatile Organic Compounds by EPA Method 8260B Sequoia Analytical -Walnut Creek Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes MW-11 111332-11 Water Sampled 17-Nov-01 13 06 Received 20-Nov-01 12:15 R-05 tert-Butyl alcohol - SND - _ 100 ug/l 5 _ 1K27026 27-Nov-01 _27-Nov-01, EPA 8260B Methyl tert-butyl ether(MTBE) ND 10 1, " " Di-isopropyl ether ND 10 " Ethyl tert-butyl ether ND 10 tert-Amyl methyl ether 25 10 1,2-Dichloroethane 19 10 Ethylene dibromide ND 10 Surrogate Dibromofluoromethane 106% 50-150 " Surrogate 1,2-Dichloroethane-d4 133% 50-150 " MW-12 111332-12 Water Sampled 17-Nov-01 it 50 Received 20-Nov-01 12 15 tert-Butyl alcohol ND 20 ugA 1 I K27026 27-Nov-01 27-Nov-01 EPA 8260E Methyl tert-butyl ether(MTBE) ND 20 " Di-isopropyl ether ND 20 " Ethyl tert-butyl ether ND 20 tert-Amyl methyl ether ND 20 1,2-Dichloroethane ND 20 " Ethylene dibromide ND 20 " Surrogate Dtbromofluoromethane 97% 50-150 " Surrogate 1,2-Dichloroethane-d4 110% 50-150 MW-13 (W111332-f- Water Sampled 17-Nov-01 09 45 Received-20-Nov-01 12-15- .tert-Butyl alcohol T, ^^w � T_ ND__ T 20 uug/I = I._ 1 K27026_Tr 27-Nov-01 27-Nov-01 _ EPA 8260B Methyl tert-butyl ether(MTBE) ND 20 -Di-isopropyl ether—_ r -- - SND__ - 20 - Ethyl tert-butyl ether ND 20 tert-Amyl methyl ether ND 20 " 1,2-Dichloroethane ND 20 Ethylene dibromide ND 20 " Surrogate Dtbromofluoromethane 96% 50-150 " Surrogate 1,2-Dichloroethane-d4 117% 50-130 Sequoia Analytical -Walnut Creek The results in this report apply to the samples analyzed in accordance with the ch custody document This analytical report must be reproduced in its enti , 9of19