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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> i 4 (916)921-9600 <br /> Analytical (916)921-0100 <br /> www.sequoialabs.com <br /> atus Environmental Project: ARCO 548,Stockton,CA <br /> 330 Cameron Park Drive,Ste.550 ProjectNumbec 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 /> VW-4 5206212-10 Water Sampled: 06/17/02 06:47 Received: 06/17/02 11:00 <br /> Tert-butyl alcohol ND 5.0 ugll 1 2060204 06/18/02 06/18/02 EPA 9260B <br /> Methyl tert-butyl ether 98 0.50 <br /> Di-isopropyl ether ND 0.50 <br /> Ethyl ter-butyl ether ND 0.50 " <br /> Tert-amyl methyl ether ND 0.50 <br /> 1,2-Dichloroethane. 9.3 0.50 " <br /> Surrogate: 1,2-DCA-0 110% 60-140 " <br /> VW-5S S206212-11 Water Sampled: 06/17/02 08:08 Received:06/17/02 11:00 <br /> Tert-butyl alcohol 25 5.0 ug/l 1 2060204 06/18/02 06/18/02 EPA 9260B <br /> Methyl tert-butyl ether 0.53 0.50 <br /> Di-isopropyl ether ND 0.50 <br /> Ethyl tent-butyl ether ND 0.50 " <br /> Tert-amyl methyl ether ND 0.54 <br /> 1,2-Dichloroethane ND 0.50 " <br /> ogate: 1,2-DCA-d4 113% 60-140 <br /> tr5l) <br /> (S206212-12)Water Sampled:06/17/02 08:14 Received:06/17/02 11:00 <br /> Tert-butyl alcohol 630 25 ug/I 5 2060204 06/18/02 06/18/02 EPA 8260B <br /> Methyl tert-butyl ether ND 2.5 <br /> Di-isopropyl ether ND 2.5 <br /> Ethyl tert-butyl ether ND 2.5 <br /> Tert-amyl methyl ether ND 2.5 <br /> 1,2-Dichloroethane ND 2.5 <br /> Surrogate:1,2-DCA44 106% 60-140 <br /> uoia 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 8 of 13 <br />