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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 <br />Sequoia Analytical - Sacramento <br />Reporting <br />4nalyte Result Limit Units Dilution Batch Prepared Analyzed Method Note: <br />D3-6 (S201351-01) Soil <br />Sampled: 01/23/02 14:25 <br />Received: 01/23/02 16:15 R-05 <br />Tert-butyl alcohol <br />ND <br />4.0 mg/kg 4 20 103 25 01/25/02 01/26/02 EPA 8260B <br />Methyl tert-butyl ether <br />1.7 <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 <br />80.0% 60-140 <br />D2-6 (S201351-02) Soil <br />Sampled: 01/23/0214:30 <br />Received: 01/23/02 16:15 R-05 <br />Tert-butyl alcohol <br />ND <br />4.0 mg/kg 4 2010325 01/25/02 01/26/02 EPA 8260B <br />Methyl tert-butyl ether <br />3.7 <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 <br />74.8% 60-140 <br />D6-6 (S201351-03) Soil <br />Samuled: 01/23/02 14:35 <br />Received: 01/23/02 16:15 R-05 <br />Tert-butyl alcohol <br />ND <br />4.0 mg/kg 4 2010325 01/25/02 01/26/02 EPA 8260B <br />Methyl tert-butyl ether <br />3.2 <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 66.0% 60-140 11 11 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 3 of 7 <br />