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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 />knalyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch 2010248 - EPA 5030B IP/T] <br />Prepared & Analyzed: 01/22/02 <br />Blank (2010248-BLK1) <br />ND <br />Prepared & Analyzed: 01/21/02 <br />Tert-butyl alcohol <br />ND <br />0.050 mg/kg <br />Methyl tert-butyl ether <br />ND <br />0.0050 " <br />Di -isopropyl ether <br />ND <br />0.0050 " <br />Ethyl tert-butyl ether <br />ND <br />0.0050 " <br />Tert-amyl methyl ether <br />ND <br />0.0050 " <br />Ethanol <br />ND <br />0.20 " <br />Surrogate: 1,2 -DCA -d4 0.0368 " 0.0430 85.6 60-140 <br />LCS (2010248 -BSI) Prepared & Analyzed: 01/21/02 <br />Methyl tert-butyl ether 0.0441 0.0050 mg/kg 0.0500 88.2 60-140 <br />Surrogate: 1,2 -DCA -d4 0.0406 " 0.0430 94.4 60-140 <br />Matrix Spike (2010248 -MSI) Source: S201309-03 Prepared & Analyzed: 01/21/02 <br />Methyl tert-butyl ether 0.0419 0.0050 mg/kg 0.0500 ND 83.5 60-140 <br />Surrogate: 1,2 -DCA -d4 0.0385 " 0.0430 89.5 60-140 <br />Matrix Spike Dup (2010248-MSD1) Source: 5201309-03 Prepared & Analyzed: 01/21/02 <br />Methyl tert-butyl ether 0.0454 0.0050 mg/kg 0.0500 ND 90.5 60-140 8.02 25 <br />Surrogate: 1,2 -DCA -d4 0.0402 110.0430 93.5 60-140 <br />Batch 2010260 - EPA 5030B [MeOH] <br />Blank (2010260-BLK1) <br />Prepared & Analyzed: 01/22/02 <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 />Ethanol <br />ND <br />10 <br />Surrogate: 1,2 -DCA -d4 2.49 112.50 99.6 60-140 <br />Sequoia Analytical - Sacramento The results in this report apply to the samples analyzed in accordance with the chain qJ <br />custody document. This analytical report must be reproduced in its entirety. <br />Page Page 15 of 17 <br />