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• 885l CA 5037 <br /> Drive <br /> Sequoia Morgan Hill CA 95037 <br /> (408)776-Si600 <br /> a— ) <br /> Analytical FAX(408)782-6308 <br /> www scQuolalabs coir <br /> URS Corporation f I1 Project ARCO#2093,Tracy,CA <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number ARCO#2093,Tracy,CA Reported <br /> Sacramento CA,95833 Project Manager Vern Elarth 09/30/02 08 20 <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 /> ATR-11 MLI0355-09 Water Sam led 09/11/02 12 35 Received 09/13/02 16 20 <br /> tert-Butyl alcohol ND 20 ugll 1 2I24029 09/24/02 09/25/02 EPA 8260B <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 12-Dichloroethane-d4 122% 78-129 <br /> ATR-]2 MLI0355-10 Water Sampled 09/11/02 12 15 Received 09/13/02 16 20 <br /> tert-Butyl alcohol ND 20 ug/I 1 2124029 09/24/02 09/25/02 EPA 8260B <br /> Methyl tert-butyl ether ND 050 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl Cert-butyl ether ND 050 " <br /> Cert-Amyl methyl ether ND 050 " <br /> Surrogate 12-Dichloroethane-d4 124% 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 This analytical report must be reproduced in its entirety <br /> 7of13 <br />