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Dr <br />Sequoia 885 Jarvis 37 <br />i�D- Mor�¢n Hill, CA X5037 <br />(408)776-9600 <br />Analytical FAX (408)782-6308 <br />www.sequoialabs.cm <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 />GasolineTTEMOxygenates 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/T] <br />Blank (2120501-BLK2) Prepared & Analyzed: 01/01/03 <br />Surrogate: 4 -BFB 0.0494 mg/kg 0.0500 99 60-140 <br />Laboratory Control Sample (2120501 -BSI) <br />Source: MLL0772-08 <br />Prepared & Analyzed: 12/31/02 <br />Prepared & Analyzed: 12/31/02 <br />Methyl tert-butyl ether <br />0.0333 <br />0.0050 <br />mg/kg 0.0448 74 60-140 <br />Benzene <br />0.0210 <br />0.0050 <br />0.0272 77 70-130 <br />Toluene <br />0.172 <br />0.0050 <br />0.167 103 70-130 <br />Gasoline (C6 -C 10) <br />2.08 <br />1.0 <br />2.20 95 70-130 <br />Surrogate: 1,2 -DCA -d4 0.0391 0.0500 78 60-140 <br />Surrogate: Toluene -d8 0.0574 0.0500 115 60-140 <br />Surrogate: 4 -BFB 0.0512 0.0500 102 60-140 <br />Laboratory Control Sample (2120501-BS2) <br />Source: MLL0772-08 <br />Prepared & Analyzed: 12/31/02 <br />Prepared & Analyzed: 01/01/03 <br />Methyl tert-butyl ether <br />0.0332 <br />0.0050 <br />mg/kg 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 />Matrix Spike (2120501-MS1) <br />Source: MLL0772-08 <br />Prepared & Analyzed: 12/31/02 <br />Methyl tert-butyl ether <br />0.0362 0.0050 mg/kg <br />0.0448 <br />ND <br />80 60-140 <br />Benzene <br />0.0219 0.0050 <br />0.0272 <br />ND <br />81 60-140 <br />Toluene <br />0.189 0.0050 <br />0.167 <br />ND <br />113 60-140 <br />Gasoline (C6 -C10) <br />1.89 1.0 <br />2.20 <br />ND <br />86 60-140 <br />Surrogate: 1,2 -DCA -d4 0.0403 0.0500 81 60-140 <br />Surrogate: Toluene -d8 0.0613 0.0500 123 60-140 <br />Surrogate: 4 -BFB 0.0549 0.0500 110 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 11 of 15 <br />