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1455 McDowell Blvd,Nonh Ste D <br /> Sequoia Petaluma,CA 94954 <br /> i�i) (707)792-1865 <br /> '� Anaytica FAX(707)792-0342 <br /> www sequoialabs corn <br /> 10 <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P406495 <br /> 2870 Gateway Oaks Drive Suite 300 ProjectNumber Intrrm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/29/04 17 56 <br /> I <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Morgan Hill <br /> Reporting <br /> Analyte Result 1-mit Units Dilution Batch Prepared Analyzed Method Note <br /> VW-11 (P406495-10)Water Sampled 06/23/04 07 24 Received 06/25/04 09 30 <br /> tert-Amyl methyl ether ND 0 50 UO 1 4GO7003 07/07/04 07/07!04 EPA 8260E <br /> tert-Butyl alcohol ND 20 " <br /> Dr-isopropyl ether ND 0 50 <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 050 <br /> Methyl tert-butyl ether ND 0 50 " <br /> Surrogate 1,2-Drchloroethane-d4 114% 78-129 " <br /> MS-1A(P406495-11)Water Sampled 06/24/0402 19 Received 06/25/04 09 30 <br /> tert-Amyl methyl ether ND 050 ugA 1 4GO7040 47/07/04 07/07/04 EPA 82608 <br /> tert-Butyl alcohol ND 20 <br /> Di-isopropyl ether ND 050 " <br /> 1,2-Drchloroethane ND 0 50 " <br /> Wanol ND 100 " CC04 <br /> yl tert-butyl ether ND 050 <br /> Methyl tert-butyl ether ND 050 " <br /> Surrogate 1,2-Drchloroethane-d4 86% 78-129 " <br /> MS-1B(P406495-12)Water Sampled 06124/0404 29 Received 06/25/0409 30 <br /> tert-Amyl methyl ether ND 050 ug/I 1 4GO7040 07/07/04 07/07/04 EPA 82608 <br /> tert-Butyl alcohol ND 20 <br /> Di-isopropyl ether ND 050 " <br /> 1,2-Drchloroethane ND 0 50 " <br /> Ethanol ND 100 " " CC04 <br /> Ethyl tert-butyl ether ND 050 " <br /> Methyl tert-butyl ether ND 050 " <br /> Surrogate 12-Drchloroethane-d4 8.5% 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 20 of 41 <br />