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Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> Z— (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> 10 www sequoialabs cont <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P406495 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/29/04 17 56 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Morgan Hill <br /> Reporting <br /> Analyte Result Lunit Units Dilution Batch Prepared Analyzed Method Not <br /> VW-2(P406495-17)Water Sampled 06/24/04 03 45 Received 06/25/04 09 30 <br /> tert-Amyl methyl ether ND 050 ug/1 1 4607024 07/07/04 07/08/04 EPA 8260B <br /> tert-Butyl alcohol ND 20 <br /> Di-isopropyl ether ND 050 <br /> 1,2-Dichloroethatte 16 050 " ^ <br /> Ethanol ND I00 " ^ <br /> Ethyl tert-butyl ether ND 050 <br /> Methyl tert-butyl ether 10 050 <br /> Surrogate 1,2-Dichloroethane-d4 114% 78-129 ^ <br /> VW-3(P406495-18)Water Sampled 06/24/042039 Received 06/25/040930 <br /> tert-Amyl methyl ether ND 050 ug/1 1 4607024 07/07/04 07/08/04 EPA 8260B <br /> tert-Butyl alcohol ND 20 " ^ <br /> Di-isopropyl ether ND 050 <br /> 1,2-Dichloroethane ND 050 <br /> hanol ND 100 <br /> yl tert-butyl ether ND 050 ^ <br /> Methyl tert-butyl ether ND 050 <br /> Surrogate 1,2-Dichloroethane-d4 111 % 78-129 " ^ <br /> VW-4(P406495-19)Water Sampled 06/24/04 02 59 Received 06/25/04 09 30 <br /> tert-Amyl methyl ether ND 050 ug/1 I 4GO7024 07/07/04 07/08/04 EPA 8260B <br /> tert-Butyl alcohol ND 20 <br /> Di-isopropyl ether ND 050 ^ <br /> 1,2-Dichloroethane 51 050 <br /> Ethanol ND 100 <br /> Ethyl tert-butyl ether ND 050 " <br /> Methyl tert-butyl ether ND 050 <br /> Surrogate 1 2-Dichloroethane-d4 108% 78-129 ^ ^ <br /> I <br /> I <br /> I <br /> Sequoia Analytical-Petaluma The results m this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> 7hrs analytical report must he reproduced in its entirely <br /> Page 22 of 41 <br />