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885]arm Dr <br /> 4DSequoia Morgan Hill,CA 95037 <br /> (408)776-9600 <br /> Analytical FAX(408)782-6308 <br /> www seatioialabs corn <br /> URS Corporation!11 Protect ARCO#2093,Tracy,CA MMD0164 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number Intrim-50265 Reported <br /> Sacramento CA,95833 Project Manager Vern Elarth 04/16/03 08 39 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Morgan Hill <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> TR-4 OEMM164-041 Water Sampled 03/31/03 13 25 Received 04JOV03 16 3 <br /> Ethanol ND 100 ugfl 1 3DO9041 04/09/03 04/10/03 EPA 8260B <br /> tert-Butyl alcohol ND 20 <br /> Methyl tert-butyl ether ND 050 <br /> Di-isopropyl ether ND 050 <br /> Ethyl tert-butyl ether ND 050 <br /> tert-Amyl methyl ether ND 050 " <br /> Surrogate 1 2-Dichloroethane-d4 956% 78-129 " <br /> ATR-5 164-05 Water Sam led 03/31/03 13 00 Received 04/02/03 16 30 <br /> Ethanol ND 100 ugA 1 3DO9041 04/09/03 04/10/03 EPA 8260B <br /> tert-Butyl alcohol ND 20 <br /> Methyl tert-butyl ether 11 050 <br /> Di-isopropyl ether ND 0 50 <br /> Ethyl tert-butyl ether ND 050 <br /> tert-Amyl methyl ether ND 050 " <br /> urroQate 12-Dichloroethane-d4 904% 78-129 " <br /> ATR-6 1 Water SainvIed.03/31/93 12.45 Received 04/02/03 16 30 <br /> Ethanol ND 100 ugA 1 3D09041 04/09/03 04/10/03 EPA 8260E <br /> tert-Butyl alcohol ND 20 <br /> Methyl tert-butyl ether 12 050 <br /> Di-isopropyl ether ND 0 50 " <br /> Ethyl tert-butyl ether ND 050 <br /> tert-Amyl methyl ether ND 050 " <br /> Surrogate 12-Dichloroethane-d4 950% 78-129 " <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain <br /> • of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> 7 of 15 <br />