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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: Arco 6100, Tracy, CA Reported: <br />Cameron Park CA, 95682 Project Manager: Jay Johnson 01/23/02 11:25 <br />Volatile Organic Compounds 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 2010260 - EPA 5030B J1Ie0HJ <br />LCS (2010260 -BSI) Prepared & Analyzed: 01/22/02 <br />Methyl tert-butyl ether 2.45 0.10 mg/kg 2.50 98.0 60-140 <br />Surrogate: 1,2 -DCA -d4 3.55 2.50 102 60-140 <br />LCS Dup (2010260-BSD1) Prepared & Analyzed: 01/22/02 <br />Methyl tert-butyl ether 2.72 0.10 mg/kg 2.50 109 60-140 10.4 25 <br />Surrogate: 1,2 -DCA -d4 <br />Sequoia Analytical - Sacramento <br />2.69 <br />11 2.50 108 60-140 <br />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 Page 16 of 17 <br />