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819 Striker Avenue,Suite 8 <br /> • Sequoia Sacramento,CA 99500 <br /> Analytical FAX(916)921-0100 <br /> www.sequoialabs.com <br /> atus Environmental Project: ARCO 548,Stockton,CA <br /> 330 Cameron Park Drive,Ste.550 Project Number: 548,Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 06/24/02 16:34 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical- Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-4 5206212-04 Water Sampled: 06/17/02 06:35 Received:06/17/02 11:00 <br /> Tert-butyl alcohol ND 5.0 ug/l 1 2060195 06/17/02 06/18/02 EPA 8260B <br /> Methyl tert-butyl ether ND 0.50 " <br /> Di-isopropyl ether ND 0.50 " <br /> Ethyl tert-butyl ether ND 0.50 <br /> Tert-amyl methyl ether ND 0.50 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> Surrogate: 1,2-DCA-d4 107% 60-140 <br /> MW-5 5206212-05 Water Sampled. 06/17/02 09:05 Received: 06/17/0211:00 <br /> Tert-butyl alcohol ND 5.0 ug/I 1 2060195 06/17/02 06/18/02 EPA 8260B <br /> Methyl tert-butyl ether ND 0.50 <br /> Di-isopropyl ether ND 0.50 " <br /> Ethyl tert-butyl ether ND 0.50 <br /> Tert-amyl methyl ether ND 0.50 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> 9ogate.- 1,2-DCA-d4 107% 60-140 " <br /> W_6(S206212-06)Water Sampled: 06/17/0205:48 Received: 06/17/02 11:00 <br /> Tert-butyl alcohol ND 5.0 ug/I 1 2060195 06/17/02 06/18/02 EPA 8260B <br /> Methyl tert-butyl ether 7.7 0.50 " <br /> Di-isopropyl ether ND 0.50 " <br /> Ethyl tert-butyl ether ND 0.50 <br /> Tert-amyl methyl ether ND 0.50 <br /> 1,2-Dichloroethane 3.7 0.50 <br /> Surrogate: 1,2-DCA-d4 107% 60-140 <br /> oia 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 Page 6 of 13 <br />