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885 Jarvis Dr <br />Sequoia Mcrgan Hill, CA 95037 <br />(408) 776-9600 <br />IW Analytical <br />FAX (408) 782-6308 <br />www.sequoialabs.ccm <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 - 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 2120501 - EPA 5030B [P/TI <br />Prepared & Analyzed: 01/01/03 <br />Ethanol <br />ND <br />0.20 mg/kg <br />Tert-butyl alcohol <br />Matrix Spike Dup (2120501-MSD1) <br />Source: MLL0772-08 <br />Prepared & Analyzed: 12/31/02 <br />ND <br />0.0050 " <br />Methyl tert-butyl ether <br />0.0344 0.0050 mg/kg <br />0.0448 <br />ND <br />76 60-140 <br />5 <br />25 <br />Benzene <br />0.0210 0.0050 <br />0.0272 <br />ND <br />77 60-140 <br />4 <br />25 <br />Toluene <br />0.180 0.0050 <br />0.167 <br />ND <br />107 60-140 <br />5 <br />25 <br />Gasoline (C6 -C10) <br />1.99 1.0 <br />2.20 <br />ND <br />90 60-140 <br />5 <br />25 <br />Surrogate: 1,2 -DCA -d4 0.0402 0.0500 80 60-140 <br />Surrogate: Toluene -d8 0.0638 0.0500 128 60-140 <br />Surrogate: 4 -BFB 0.0570 0.0500 114 60-140 <br />Batch 3010002 - EPA 5030B [P/'1' <br />Blank (3010002-BLK1) <br />Prepared & Analyzed: 01/01/03 <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 0.0397 0.0500 79 60-140 <br />Surrogate: Toluene -d8 0.0573 0.0500 115 60-140 <br />Surrogate: 4 -BFB 0.0494 0.0500 99 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 12 of 15 <br />