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885 Jarvis Dr <br />Sequoia Mogan HiD, CA 95037 <br />(408)776-9600 <br />Analytical <br />FAX (408) 782-6308 <br />www. sequoialabs.cm <br />URS Corporation [Ij Project: ARCO #2093, Tracy, CA MLL0772 <br />2870 Gateway Oaks Dr., Ste 300 Project Number: ARCO #2093, Tracy, CA Reported: <br />Sacramento CA, 95833 Project Manager: Vern Elarth 01/07/03 14:23 <br />Gasoline\BTEX\Oxygenates by EPA method 8260B <br />Sequoia Analytical - Sacramento <br />Reporting <br />Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Note: <br />LS -3-5 (MLL0772-11) Soil <br />Sampled: 12/18/0211:15 <br />Received: 12/18/02 10:38 <br />Tert-butyl alcohol <br />0.10 <br />0.050 <br />mg/kg 1 3010002 01/01/03 01/01/03 EPA 8260B <br />Methyl tert-butyl ether <br />ND <br />0.0050 <br />" <br />Di -isopropyl ether <br />ND <br />0.0050 <br />" <br />Ethyl tert-butyl ether <br />ND <br />0.0050 <br />Tert-amyl methyl ether <br />ND <br />0.0050 <br />Benzene <br />ND <br />0.0050 <br />Ethylbenzene <br />ND <br />0.0050 <br />" <br />Toluene <br />ND <br />0.0050 <br />" <br />Xylenes (total) <br />ND <br />0.010 <br />Gasoline (C6 -C10) <br />ND <br />1.0 <br />" <br />Surrogate: 1,2 -DCA -d4 <br />84% <br />60-140 <br />Surrogate: Toluene -d8 <br />117% <br />60-140 <br />Surrogate: 4 -BFB <br />98% <br />60-140 <br />LS -4-5 1/2 (MLL0772-12) Soil Sampled: 12/18/02 11:25 Received: 12/18/02 10:38 HT -RS <br />Tert-butyl alcohol <br />ND <br />0.050 <br />mg/kg 1 3010002 01/01/03 01/02/03 EPA 8260B <br />Methyl tert-butyl ether <br />ND <br />0.0050 <br />" <br />Di -isopropyl ether <br />ND <br />0.0050 <br />" <br />Ethyl tert-butyl ether <br />ND <br />0.0050 <br />Tert-amyl methyl ether <br />ND <br />0.0050 <br />Benzene <br />ND <br />0.0050 <br />Ethylbenzene <br />ND <br />0.0050 <br />Toluene <br />ND <br />0.0050 <br />Xylenes (total) <br />ND <br />0.010 <br />" <br />Gasoline (C6 -C10) <br />ND <br />1.0 <br />Surrogate: 1,2 -DCA -d4 80% 60-140 " <br />Surrogate: Toluene -d8 117% 60-140 <br />Surrogate: 4 -BFB 101% 60-140 <br />Sequoia Analytical - Morgan Hill <br />The results in this report apply to the samples analyzed in accordance with the chain of <br />custody document. Unless otherwise stated, results are reported on a wet weight basis. <br />This analytical report must be reproduced in its entirety. <br />Page 8 of 15 <br />