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Sequoia <br />_)� <br />IW 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 03/26/02 09:58 <br />Volatile Organic Compounds by EPA Method 8260B <br />Sequoia Analytical - Sacramento <br />Reporting <br />Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Note: <br />D-7-3.5 (5201303-07) Soil <br />Sampled: 01/18/02 12:10 <br />Received: 01/18/02 15:50 R-05 <br />Tert-butyl alcohol <br />ND <br />2.0 mg/kg 2 2010260 01/22/02 01/22/02 EPA 8260B <br />Methyl tert-butyl ether <br />0.88 <br />0.20 " <br />Di -isopropyl ether <br />ND <br />0.20 " <br />Ethyl tert-butyl ether <br />ND <br />0.20 " <br />Tert-amyl methyl ether <br />ND <br />0.20 " <br />Ethanol <br />ND <br />20 " <br />Surrogate: 1,2 -DCA -d4 <br />65.2% 60-140 <br />D-8-3.5 (5201303-08) Soil <br />Samaled: 01/18/02 12:20 <br />Received: 01/18/02 15:50 R-05 <br />Tert-butyl alcohol <br />ND <br />4.0 mg/kg 4 2010260 01/22/02 01/22/02 EPA 8260B <br />Methyl tert-butyl ether <br />7.3 <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 />0.40 " <br />Ethanol <br />ND <br />40 " <br />Surrogate: 1,2 -DCA -d4 65.6% 60-140 11" " <br />11 <br />L-1-6 (5201303-09) Soil Sampled: 01/18/02 12:30 Received: 01/18/02 15:50 _ R-05 <br />Tert-butyl alcohol <br />ND <br />0.25 mg/kg 5 2010248 01/21/02 01/21/02 EPA 8260B <br />Methyl tert-butyl ether <br />ND <br />0.025 " <br />Di -isopropyl ether <br />ND <br />0.025 " <br />Ethyl tert-butyl ether <br />ND <br />0.025 <br />Tert-amyl methyl ether <br />ND <br />0.025 <br />Ethanol <br />ND <br />1.0 " <br />Surrogate: 1.2 -DCA -d4 94.9% 60-140 "11" " <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 10 of 18 <br />