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819 Striker Avenue,Suite 8 <br /> i S@qEIOIs`i Sacramento, 5834 <br /> 916)2199600 <br /> Analytical FAX(916)921-0100 <br /> J www.sequoialabs.com <br /> Iatus Environmental Project. ARCO 548,Stockton,CA <br /> 0 Cameron Park Drive,Ste. 550 ProjectNumber: 548,Stockton,CA Reported: <br /> meron 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-1 5206212-01 Water Sampled:06/17/02 08:28 Received:06/17/02 11:00 <br /> Tert-butyl alcohol ND 50 ugll 10 2060195 06/17/02 06/18/02 EPA 8260B <br /> Methyl tent-butyl ether 770 5.0 <br /> Di-isopropyl ether ND 5.0 <br /> Ethyl tert-butyl ether ND 5.0 <br /> Tert-amyl methyl ether 5.1 5.0 <br /> 1,2-Dichloroethane ND 5.0 <br /> Surrogate:1,2-DCA-d4 103% 60-140 <br /> MW-2 S206212-02 Water Sampled:06/17/02 07:57 Received:06/17/0211:00 <br /> Tert-butyl alcohol ND 5.0 ug/1 1 2060195 06/17/02 06/18/02 EPA 8260B <br /> Methyl tert-butyl ether 1.4 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 /> 00gate: 1,2-DCA-d4 106% 60-140 " <br /> MW-3(S206212-03)Water Sampled:06/17/02 07:20 Received: 06/17/0211_:_00 <br /> Tert-butyl alcohol ND 5.0 ugll 1 2060195 06/17/02 06/18/02 EPA 8260B <br /> Methyl tert-butyl ether ND 0.50 " <br /> Di-isopropyl ether ND 0.54 <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 110% 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 5 of 13 <br />