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885 Jarvis Dr <br />4D Sequoia Mcrlpn Hill, CA 95037 <br />(408)776-9600 <br />IW Analytical FAX (408) 782-6308 <br />www.sequoialabs.ccm <br />URS Corporation [11 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 - Quality Control <br />Sequoia Analytical - Sacramento <br />Reporting Spike Source %REC RPD <br />Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch 3010002 - EPA 5030B [P/TI <br />Blank (3010002-BLK2) <br />Methyl cert -butyl ether <br />Prepared & Analyzed: 01/02/03 <br />Ethanol <br />ND <br />0.20 mg/kg <br />Tert-butyl alcohol <br />ND <br />0.050 " <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 />1,2-Dichloroethane <br />ND <br />0.0050 " <br />1,2-Dibromoethane (EDB) <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 />Gasoline (C6 -C10) <br />ND <br />1.0 <br />Surrogate: 1,2 -DCA -d4 0.0324 0.0500 65 60-140 <br />Surrogate: Toluene -d8 0.0606 0.0500 121 60-140 <br />Surrogate: 4 -BFB 0.0517 0.0500 103 60-140 <br />Laboratory Control Sample (3010002-BS1) <br />Prepared & Analyzed: 01/01/03 <br />Methyl cert -butyl ether <br />0.0332 <br />0.0050 mg/kg <br />0.0448 74 60-140 <br />Benzene <br />0.0214 <br />0.0050 <br />0.0272 79 70-130 <br />Toluene <br />0.171 <br />0.0050 <br />0.167 102 70-130 <br />Gasoline (C6 -C10) <br />2.05 <br />1.0 <br />2.20 93 70-130 <br />Surrogate: 1,2 -DCA -d4 0.0394 0.0500 79 60-140 <br />Surrogate: Toluene -d8 0.0574 0.0500 115 60-140 <br />Surrogate: 4 -BFB 0.0536 0.0500 107 60-140 <br />Laboratory Control Sample (3010002-BS2) <br />Prepared & Analyzed: 01/02/03 <br />Methyl tert-butyl ether <br />0.0328 <br />0.0050 <br />mg/kg 0.0448 73 60-140 <br />Benzene <br />0.0204 <br />0.0050 <br />0.0272 75 70-130 <br />Toluene <br />0.163 <br />0.0050 <br />0.167 98 70-130 <br />Gasoline (C6 -C10) <br />1.92 <br />1.0 <br />2.20 87 70-130 <br />Surrogate: I,2 -DCA -d4 0.0385 110.0500 77 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 13 of 15 <br />