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li Blvd <br /> 1455 McDaweSte <br /> Sequoia Petaluma,,CA CA 949544 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequnialabs 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 Elarth 07/29/04 17 56 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Morgan Hill <br /> Reporting <br /> Analyse Result Limit Units Dilution Batch Prepared Analyzed Method Note <br /> MS-3B(P406495-13)Water Sampled 06/24/04 21 35 Received 06/25/04 09 30 <br /> tert-Amyl methyl ether ND 2 5 ugA 5 4608001 07/08/04 07/08/04 EPA 8260B <br /> tert-Butyl alcohol ND 100 ^ <br /> Di-isopropyl ether ND 25 ^ <br /> 1,2-Dichloroethane 120 25 " <br /> Ethanol ND 500 <br /> Ethyl tert-butyl ether ND 25 " <br /> Methyl tert-butyl ether ND 25 " <br /> Surrogate 12-Dichloroethane-d4 87% 78-129 " <br /> MW-6(P406495-14)Water Sampled 06/24/04 02 43 Received 06/25/04 09 30 <br /> tert-Amyl methyl ether ND 050 ug11 l 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 066 050 " <br /> anol ND 100 <br /> yl tert-butyl ether ND 050 <br /> Methyl tert-butyl ether ND 050 " <br /> Surrogate 1,2-Dichloroethane-d4 109% 78-129 " <br /> VW-I(P406495-16)Water Sampled 06124/04 21 23 Received 06/25/04 09 30 <br /> tert-Amyl methyl ether ND 5 0 ug/I 10 4GO8001 07/08/04 07/08/04 EPA 8260B <br /> tcrt-Butyl alcohol ND 200 " ~ <br /> Di-isopropyl ether ND 50 <br /> 1,2-Dichloroethane 470 50 " <br /> Ethanol ND 1000 " <br /> Ethyl tert-butyl ether ND 50 ^ <br /> Methyl tert-butyl ether ND 50 ~ <br /> Surrogate 1,2-Dtchloroethane-d4 86% 78-129 " <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed to 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 21 of 41 <br />