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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 <br />Sequoia Analytical - Sacramento <br />Reporting <br />knalyte Result Limit Units Dilution Batch Prepared Analyzed Method Note <br />L2-1-2.5 (S202153-01) Soil <br />Sampled: 02/11/02 13:50 <br />Received: 02/12/02 12:35 R-05 <br />Tert-butyl alcohol <br />ND <br />10 mg/kg 10 2020181 02/19/02 02/19/02 EPA 8260B <br />Methyl tert-butyl ether <br />ND <br />1.0 " <br />Di -isopropyl ether <br />ND <br />1.0 " <br />Ethyl tert-butyl ether <br />ND <br />1.0 " <br />Tert-amyl methyl ether <br />ND <br />1.0 <br />Surrogate: 1,2 -DCA -d4 <br />76.4% 60-140 <br />L2-2-2-3 (S202153-02) Soil <br />Sampled: 02/11/02 14:25 <br />Received: 02/12/02 12:35 <br />Tert-butyl alcohol <br />ND <br />1.0 mg/kg 1 2020181 02/19/02 02/19/02 EPA 8260B <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 />— <br />Surrogate: 1,2 -DCA -d4 <br />------- ----- -- ----- <br />83.6% 60-140 <br />L2-3-3.5 (S202153-03) Soil <br />Sampled: 02/11/02 00:00 <br />Received: 02/12/02 12:35 R-05 <br />Tert-butyl alcohol <br />ND <br />4.0 mg/kg 4 2020181 02/19/02 02/19/02 EPA 8260B <br />Methyl tert-butyl ether <br />0.42 <br />0.40 " <br />Di -isopropyl ether <br />ND <br />0.40 " <br />Ethyl tert-butyl ether <br />ND <br />0.40 <br />Tert-amyl methyl ether <br />ND <br />4.0 " <br />Surrogate: 1,2 -DCA -d4 <br />76.0% 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 3 of 6 <br />WE <br />