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�v 885 Jarvis Dr <br />A7equ®la Mo:gin Hill, CA 95037 <br />(408)776-9600 <br />Analytical FAX (408)782-6308 <br />www.sequoialabs.car <br />URS Corporation [l] 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: Vem 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/Tl <br />Source: S212674-12 <br />Prepared & Analyzed: 01/01/03 <br />Laboratory Control Sample (3010002-BS2) <br />Methyl tert-butyl ether <br />0.0332 0.0050 mg/kg <br />Prepared & Analyzed: 01/02/03 <br />Surrogate: Toluene -d8 <br />0.0558 <br />mg/kg <br />0.0500 112 60-140 <br />Surrogate: 4 -BFB <br />0.0501 <br />110.0500 <br />100 60-140 <br />Matrix Spike (3010002-MS1) <br />0.167 ND 104 60-140 <br />Source: S212674-12 <br />Prepared & Analyzed: 01/01/03 <br />Methyl tert-butyl ether <br />0.0338 <br />0.0050 mg/kg <br />0.0448 ND 74 60-140 <br />Benzene <br />0.0212 <br />0.0050 <br />0.0272 ND 78 60-140 <br />Toluene <br />0.173 <br />0.0050 <br />0.167 ND 103 60-140 <br />Gasoline (C6 -C10) <br />2.09 <br />1.0 <br />2.20 ND 95 60-140 <br />Surrogate: 1,2 -DCA -d4 0. 0405 0.0500 81 60-140 <br />Surrogate: Toluene -d8 0.0607 0.0500 121 60-140 <br />Surrogate: 4 -BFB 0.0525 0.0500 105 60-140 <br />Matrix Spike Dup (3010002-MSD1) <br />Source: S212674-12 <br />Prepared & Analyzed: 01/01/03 <br />Methyl tert-butyl ether <br />0.0332 0.0050 mg/kg <br />0.0448 ND 73 60-140 <br />2 <br />25 <br />Benzene <br />0.0218 0.0050 <br />0.0272 ND 80 60-140 <br />3 <br />25 <br />Toluene <br />0.175 0.0050 <br />0.167 ND 104 60-140 <br />1 <br />25 <br />Gasoline (C6 -C10) <br />2.13 1.0 <br />2.20 ND 97 60-140 <br />2 <br />25 <br />Surrogate: 1,2 -DCA -d4 0.0376 0.0500 75 60-140 <br />Surrogate: Toluene -d8 0.0554 0.0500 111 60-140 <br />Surrogate: 4 -BFB 0.0500 0.0500 100 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 14 of 15 <br />