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1455 McDowell Sivd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1665 <br /> Au alytical FAX(707)792-0342 <br /> WWW sequoialabs com <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 EIarth 07/29/04 17 56 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Morgan Hill <br /> Reporting <br /> Analyte Result Limit dints Dilution Batch Prepared Analyzed Method Note <br /> VW-5(P406495-20)Water Sampled 06/24/04 20 56 Received 06/25/04 09 30 <br /> tert-Amyl methyl ether ND 25 ugn 5 4GO8001 07108104 07/08/04 EPA 82606 <br /> tert-Butyl alcohol ND 100 " <br /> Di-isopropyl ether ND 25 ^ " <br /> 1,2-Drchloroethane 220 25 <br /> Ethanol ND 500 <br /> Ethyl tert-butyl ether ND 25 <br /> Methyl tert-butyl ether ND 2 5 ^ <br /> Surrogate 12-Dichloroethane-d4 90% 78-129 " <br /> VW-7(P406495-21)Water Sampled 06/24/04 04 09 Received 06125/04 09 30 <br /> tert-Amyl methyl ether ND 0 50 ug/l I 4GO7024 07/07/04 07/07!04 EPA 8260B <br /> tert-Butyl alcohol ND 20 <br /> Di-isopropyl ether ND 0 50 " <br /> 1,2-Dichloroethane 16 050 <br /> hanol ND 100 <br /> yl tert-butyl ether ND 050 " <br /> Methyl tert-butyl ether 1 1 050 <br /> Surrogate 1,2-Dichloroethane-d4 115% 78-129 " <br /> VW-8(P406495-22)Water Sampled 06/24/04 21 58 Received 06/25/04 09 30 <br /> ter-Amyl methyl ether ND 25 ug/I 5 4GO8001 07/08/04 07/08/04 EPA 8260B <br /> tert-Butyl alcohol ND 100 <br /> Di-isopropyl ether ND 2 5 " ^ <br /> 1,2-Dichloroethane 300 25 <br /> Ethanol ND 500 " ^ <br /> Ethyl tert-butyl ether ND 25 " ^ <br /> Methyl tert-butyl ether 2 8 25 " <br /> Surrogate 1,2-Drchloroethane-d4 86% 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 23 of 41 <br />