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1551 Industrial Road <br /> a_ _� <br /> Sequoia Sae Carlos CA 94070 <br /> Analytical (650)232-9600 <br /> v#jWFAX(650)232-9612 <br /> WWW sequotalabs Com <br /> 0 er-Ryan/Geostrategies(l) Project Unocal(4) <br /> Sierra Court,Suite J Project Number Former Unocal 42859,Stockton Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/30/02 14 17 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B <br /> Sequoia Analytical - San Carlos <br /> Reporting <br /> Analyse Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-11 L205055-1 I Water Sampled 05/14/02 13 15 Received-05/14/02 17 50 R-05 <br /> 1,2-Dibromoethane ND 33 ug/l 333 2050035 05/17/02 05/17/02 EPA 8260E <br /> 1,2-Dichloroethane ND 33 " <br /> Di-isopropyl ether ND 33 <br /> Ethyl tert-butyl ether NO 33 <br /> Methyl tert-butyl ether ND 33 <br /> Tert-amyl methyl ether ND 33 <br /> Tert-butyl alcohol ND 670 <br /> Surrogate 1,2-Dichloroethane-d4 103% 70-130 " <br /> Surrogate Toluene-d8 102% 70-130 " <br /> MW-12(L205055-12)Water Sampled 05/14/02 13 45 Received 05/14/02 I7 50 <br /> 1,2-Dibromoethane� ND 10 ug/l I 2050035 05/17/02 05/17/02 EPA 8260B <br /> 1,2-Dichloroethane ND 10 <br /> Di-isopropyl ether ND 10 <br /> Ethyl tert-butyl ether ND 10 <br /> I tert-butyl ether ND 10 " <br /> yl methyl ether ND 10 " <br /> Tert-butyl alcohol ND 20 <br /> Surrogate 1,2-Dichloroethane-d4 101 % 70-130 " <br /> Surrogate Toluene-d8 103 % 70-130 " <br /> MW-13(L205055-13)Water Sampled 05/14/02 ll 25 Received 05/1.4/02 17 50 <br /> 1,2-Dibromoethane ND 1 0 ug/I 1 2050035 05/17/02 05/17/02 EPA 8260E <br /> 1,2-Dichloroethane ND 10 " <br /> Di-isopropyl ether ND 10 <br /> Ethyl tert-butyl ether ND 10 <br /> Methyl tert-butyl ether ND 1 0 " <br /> Tert-amyl methyl ether ND 10 <br /> Tert-butyl alcohol ND 20 " ^ <br /> Surrogate 1,2-Dichloroethane-d4 102 % 70-130 " <br /> Surrogate Toluene-d8 100% 70-130 " <br /> S to Analytical- San Carlos The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 10 of 20 <br />