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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 01/28/02 15:54 <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 2010325 - EPA 5030B [MeOH] <br />Blank (2010325-BLKI) <br />Prepared: 01/25/02 Analyzed: 01/26/02 <br />Tert-butyl alcohol <br />ND <br />1.0 <br />mg/kg <br />Methyl tert-butyl ether <br />ND <br />0.10 <br />" <br />Di -isopropyl ether <br />ND <br />0.10 <br />" <br />Ethyl tert-butyl ether <br />ND <br />0.10 <br />" <br />Tert-amyl methyl ether <br />ND <br />0.10 <br />" <br />Ethanol <br />ND <br />10 <br />" <br />Surrogate: 1,2 -DCA -d4 <br />2.62 <br />2.50 105 60-140 <br />L_CS (2010325-BS1) <br />Prepared: 01/25/02 Analyzed: 01/26/02 <br />Methyl tert-butyl ether <br />2.31 <br />0.10 <br />mg/kg 2.50 92.4 60-140 <br />Surrogate: 1,2 -DCA -d4 2.45 2.50 98.0 60-140 <br />LCS Dup (2010325-BSD1) Prepared: 01/25/02 Analyzed: 01/26/02 <br />Methyl tert-butyl ether 2.32 0.10 mg/kg 2.50 92.8 60-140 0.432 25 <br />Surrogate: 1,2 -DCA -d4 ?.41 11 2.50 96.4 60-140 <br />Sequoia Analytical - Sacramento <br />The results in this report apply to the samples analyzed in accordance with the chain <br />of custody document. This analytical report must be reproduced in its entirety. <br />Page Page 6 of 7 <br />