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• 885 Jarvis Dr <br />Sequoia Morgan Hill, CA 95037 <br />6104 (408)776-9600 <br />Analytical FAX (408) 782-6308 <br />T www. sequoialabs.car. <br />URS Corporation [1] 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 Notes <br />DI -5-3 1/2 (MLL0772-05) Soil <br />Sampled: 12/18/02 10:50 Received: 12/18/02 10:38 <br />Tert-butyl alcohol <br />ND <br />0.050 <br />mg/kg 1 2120501 12/31/02 12/31/02 EPA 8260B <br />Methyl tert-butyl ether <br />ND <br />0.0050 <br />" <br />Di -isopropyl ether <br />ND <br />0.0050 <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 />" <br />Ethylbenzene <br />0.0077 <br />0.0050 <br />Toluene <br />ND <br />0.0050 <br />" <br />Xylenes (total) <br />0.078 <br />0.010 <br />Gasoline (C6 -C10) <br />ND <br />1.0 <br />" <br />Surrogate: 1,2 -DCA -d4 <br />76% <br />60-140 " <br />Surrogate: Toluene -d8 <br />117% <br />60-140 <br />Surrogate: 4 -BFB <br />105% <br />60-140 " <br />DI -6-4 (MLL0772-06) Soil Sampled: 12/18/02 10:55 <br />Received: 12/18/02 10:38 <br />Tert-butyl alcohol <br />ND <br />0.050 <br />mg/kg 1 2120501 12/31/02 12/31/02 EPA 8260B <br />Methyl tert-butyl ether <br />ND <br />0.0050 <br />Di -isopropyl ether <br />ND <br />0.0050 <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 />Xylenes (total) <br />0.011 <br />0.010 <br />Gasoline (C6 -C10) <br />ND <br />1.0 <br />Surrogate: 1,2 -DCA -d4 <br />90% <br />60-140 " <br />Surrogate: Toluene -d8 <br />122% <br />60-140 <br />Surrogate: 4 -BFB <br />104% <br />60-140 <br />Sequoia Analytical - Morgan Hill 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 5 of 15 <br />