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Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma, 94954 <br /> (707)79 2-1865 <br /> FAX 342 <br /> Analytical wwseq oialab com <br /> www sequoialabs com <br /> 0 <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P406495 <br /> 2870 Gateway Oaks Dave 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 Limit Units Dilution Batch Prepared Analyzed Method Note <br /> MW4(P406495-04)Water Sampled 06/23/04 03 10 Received 06/25/04 09 30 <br /> tert-Amyl methyl ether ND 0 50 ugll 1 4GO7003 07/07/04 07/07/04 EPA 8260E <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 0 50 " <br /> 1,2-Dtchloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 0 50 " <br /> Methyl tert-butyl ether ND 050 " <br /> Surrogate 1 2-Dichloroethane-d4 110% 78-129 " <br /> MW-5(P406495-05)Water Sampled 06/23/04 05 47 Received 06/25/04 09 30 <br /> tert-Amyl methyl ether ND 0 50 ug/1 I 4G07003 07/07/04 07/07/04 EPA 8260B <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 050 " <br /> 1,2-Dtchloroethane ND 050 <br /> 4Vanol ND 100 " <br /> hyl tert-butyl ether ND 0 50 " <br /> Methyl tert-butyl ether 18 050 " <br /> Surrogate 1,2-Dtchloroethane-d4 109% 78-129 " <br /> MW-7(P406495-06)Water Sampled 06/23/04 02 35 Received 06125/04 09 30 <br /> cert-Amyl methyl ether ND 050 ugh I 4GO7003 07/07/04 07/07/04 EPA 9260B <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 050 " <br /> 1,2-Dtchloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 050 <br /> Methyl tert-butyl ether ND 050 " <br /> Surrogate 1,2-Dtchloroethane-d4 106% 78-129 " <br /> Sequoia Analytical-Petaluma The results in 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 /> • This analytical report must be reproduced in its entirety <br /> Page 18 of 41 <br />