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1455 McDowell Blvd,North Ste D <br /> a— ) Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> • <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 /> Reporong <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Note. <br /> VW-10(P406495-23)Water Sampled 06/24/04 22 20 Received 06/25/04 09 30 <br /> ler!-Amyl methyl ether ND 2 5 ug/I 5 4GO8001 07/08/04 07/06/04 EPA 8260B <br /> tert-Butyl alcohol ND 100 " <br /> Di-isopropyl ether ND 25 " <br /> 1,2-Dtchloroethane 290 2 5 " <br /> Ethanol ND 500 " <br /> Ethyl tert-butyl ether ND 25 " <br /> Methyl tent-butyl ether 28 25 " <br /> Surrogate 1,2-Dtchloroethane-d4 80% 78-129 " <br /> VW-12(P406495-24)Water Sampled 06/24/04 03 22 Received 06/25/04 09 30 <br /> tent-Amyl methyl ether ND 050 ug/I I 4GO7024 07/07/04 07/07/04 EPA 8260B <br /> tent-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 050 " <br /> 1,2-Dtchloroethane 47 050 <br /> hanol ND 100 <br /> hyl tert-butyl ether ND 050 " <br /> Methyl cert-butyl ether ND 050 " <br /> Surrogate 1,2-Dtchloroethane-d4 114% 78429 " <br /> Sequoia Analytical-Petaluma Tire 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 24 of 41 <br />