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819 Striker Avenue,Suite 8 <br /> Sequoia Sacrame5934 <br /> nto, <br /> CA 2199630 <br /> Analytical FAX(916)92 1-0100 <br /> www.sequoialabs.com <br /> acus 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 /> VW-1 S206212-07 Water Sampled: 06/17/02 08:21 Received:06/17/02 11:00 <br /> Tert-butyl alcohol ND 5.0 ugll 1 2060204 06/18/02 06118!02 EPA 8260B <br /> Methyl tent-butyl ether 7.8 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 1.5 0.50 " <br /> Surrogate: 1,2-DCA-d4 114% 60-140 " <br /> VW-2(6206212-08)Water Sampled:06/17/02 06:53 Received:0611710211:00 <br /> Tert-butyl alcohol ND 5.0 ug/l 1 2060204 06/18/02 06/18/02 EPA 8260E <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 /> &,oggate:1,2-DCA-d4 112% 60-140 <br /> VW-3(5206212-09)Water Sampled:06/17/02 07:38Received:0611710211:00 <br /> Tert-butyl alcohol ND 5.0 ug/1 1 2060204 06/18/02 06/18/02 EPA 8260E <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 0.54 0.50 " <br /> Surrogate:1,2-DCA-d4 110% 60-140 <br /> C1ma.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 7 of 13 <br />