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Sequoia 81 Striker Avenue,Suite <br /> ' Sacramento,CA 95$344 <br /> 1 ) <br /> y FAX(916)911-0100 <br /> Analytical www.sequoialabs.com <br /> Stratus Environmental Project: ARCO 5469,Stockton,CA <br /> 3330 Cameron Park Drive,Ste. 550 Projecthlumber: 5469,Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 10/14/02 16:55 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical- Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Nntes <br /> MW-9(S209427-08)Water Sampled: 09/19/02 04:32 Received:09/19/02 09:30 <br /> Tert-butyl alcohol ND 5.0 ugA 1 2100002 10/01/02 10/01/02 EPA 82608 <br /> Methyl tert-butyl ether 0.60 0.50 <br /> Di-isopropyl ether 3.1 0.50 " <br /> Ethyl tert-butyl ether ND 0.50 <br /> Tert-amyl methyl ether ND 0.50 " <br /> Ethanol ND 50 <br /> 1,2-Dichloroethane 19 0.50 " <br /> 1,2-Dibromoethane(EDB) ND 0.50 <br /> Surrogate: 1,2-DCA-d4 116% 60-140 - <br /> MW-10(S209427-09)Water Sampled:09/19/0205:14 Received:09/19/02 09:30 <br /> Tert-butyl alcohol ND 5.0 ugA 1 2100002 10/01/02 10/01/02 EPA 8260B <br /> Methyl tent-butyl ether 66 0.50 <br /> isopropyl ether ND 0.50 <br /> 1 tent-butyl ether ND 0.50 <br /> Tert-amyl methyl ether ND 0.50 " <br /> Ethanol ND 50 <br /> 1,2-Dichloroethane 1.0 0.50 <br /> 1,2-Dibromoethane(EDS) ND 0.50 " <br /> Surrogate: 1,2-DCA-d4 115% 60-140 " <br /> MW-5(5209427-10)Water Sampled: 09/19/02 07:00 Received: 09/19/02 09:30 <br /> Tert-butyl alcohol ND 500 ug/l 100 2100002 10/01/02 10/02/02 EPA 8260E <br /> Methyl tert-butyl ether 4600 50 <br /> Di-isopropyl ether ND 50 <br /> Ethyl tert-butyl ether ND 50 " <br /> Tert-amyl methyl ether ND 50 <br /> Ethanol ND 5000 " <br /> 1,2-Dichloroethane ND 50 <br /> 1,2-Dibromoed=e(EDB) _ ND 50 " <br /> Surrogate: 1,2-DCA-d4 107% 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 8 of 13 <br />