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Seq tIndustrial Road <br /> (���'� ll Q l it Sanan Carlos CA 94070 <br /> 9600 <br /> Analytical (Si54)232 9612 <br /> TOWFAX(650 2 <br /> www sequaielabs corn <br /> CT-Ryan/Geostrategies(I Project Tosco(l) <br /> Sierra Court,Suite] Project Number Unocal SS#08671,Stockton,CA Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 02/28/02 11 15 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B <br /> Sequoia Analytical - San Carlos <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> 1%JW-1 (L202080-02)Water Sampled 02/12/01 17 30 Received 02/13/02 07 35 <br /> Ethanol ND 5000 ugA 10 2020054 02/15/02 02/15/02 EPA 8260B <br /> 1,2-Dibromoethane ND 20 " <br /> 1,2-Dichloroethane ND 20 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 " <br /> Methyl tert-butyl ether 1100 20 " <br /> Tert-amyl methyl ether ND 20 " <br /> Tert-butyl alcohol ND 1000 " <br /> Surro.eate 12-Dichloroethane-d4 115% 70-130 " <br /> Surrogate Toluene-d8 984% 70-130 " <br /> MW-1 L202080-03 Water Sampled 02/12/02 16 55 Received 02/13/02 07 35 <br /> Ethanol ND 500 ug/l 1 2020060 02/19/02 02/19/02 EPA 8260B <br /> 1,2-Dibromoethane ND 2 0 " <br /> 1chloroethane ND 2 0 <br /> i& " <br /> Iropy] ether ND 20 <br /> Ethyl tert-butyl ether ND 20 " <br /> Methyl tert-butyl ether 88 20 " <br /> Tert-amyl methyl ether ND 20 " <br /> Tert-butyl alcohol ND 100 " <br /> Surrogate 1 2-Dichloroethane-d4 932 % 70-130 " <br /> Surrogate Toluene-d8 109% 70-130 " <br /> MW-3 (L202080-04)Water Sampled 02/12/02 16 25 Received 01/13/02 07 35 <br /> Ethanol ND 500 ugA 1 2020060 02/19/02 02/19/02 EPA 8260B <br /> 1,2-Dibromoethane ND 20 " <br /> 1,2-Dichloroethane ND 20 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 " <br /> Methyl tert-butyl ether ND 20 " <br /> Tert-amyl methyl ether ND 20 " <br /> Tert-butyl alcohol ND 100 " <br /> Surrogate 1,2-Dichloroethane-d4 974% 70-130 " <br /> Surrozate Toluene-d8 109% 70-130 " <br /> —S*a Analytical - San Carlos The t esults in this repot t apply 10 the samples analyzed in accordance with the chain <br /> of custody document This analytical t eport must be reproduced in its entirety <br /> Page 2 of 16 <br />