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Sequoia <br />� Analytical <br />819 Striker Avenue, Suite 8 <br />Sacramento, CA 95834 <br />(916)921-9600 <br />FAX (916) 921-0100 <br />www.sequoialabs.com <br />Delta Environmental Consultants (Cameron Park) Project: Arco 6100, Tracy, CA <br />3330 Cameron Park Dr. Ste 550 Project Number: 6100, Tracy, CA Reported: <br />Cameron Park CA, 95682 Project Manager: Jay Johnson 02/20/02 16:47 <br />Volatile Organic Compounds by EPA Method 8260B - Quality Control <br />Sequoia Analytical - Sacramento <br />Reporting Spike Source %REC RPD <br />knalyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch 2020181 - EPA 5030B [MeOH] <br />Blank (2020181-BLK1) <br />Prepared & Analyzed: 02/19/02 <br />Tert-butyl alcohol <br />ND <br />1.0 mg/kg <br />Methyl tert-butyl ether <br />ND <br />0.10 " <br />Di -isopropyl ether <br />ND <br />0.10 " <br />Ethyl tert-butyl ether <br />ND <br />0.10 " <br />Tert-amyl methyl ether <br />ND <br />0.10 " <br />Surrogate: 1,2 -DCA -d4 <br />2.34 <br />2.50 93.6 60-140 <br />LCS (2020181 -BSI) Prepared & Analyzed: 02/19/02 <br />Methyl tert-butyl ether 2.15 0.10 mg/kg 2.50 86.0 60-140 <br />Surrogate: 1,2 -DCA -d4 2.52 2.50 101 60-140 <br />LCS Dup (2020181-BSDI) Prepared & Analyzed: 02/19/02 <br />Methyl tert-butyl ether 2.24 0.10 mg/kg 2.50 89.6 60-140 4.10 25 <br />Surrogate: 1,2 -DCA -d4 2.68 2.50 107 60-140 <br />Sequoia Analytical - Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br />custody document. This analytical report must be reproduced in its entirety. <br />Page 5 of 6 <br />0 <br />