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7 <br /> 1455 McDowell Blvd <br /> Sequoia PelaluSte ina,CA CA 949544 <br /> (707)792-1865 <br /> TW Analytical FAX(707)7920342 <br /> iswww sequoialabs coin <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P403188 <br /> 2870 Gateway Oaks Dnve Suite 300 Project Number Intrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 04/12/04 10 17 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MS 3B(P403188-23)Water Sampled 03/09/04 05 58 Received 0311.0104 08 00 <br /> Tetmchloroethene ND 050 ugll 1 4030564 03/19/04 03/20/04 EPA 8260B <br /> Trichloroethene 054 050 " <br /> Tert-amyl methyl ether ND 10 " <br /> Benzene 35 0 50 " <br /> Tett-butyl alcohol ND 20 <br /> Dr-isopropyl ether ND 1 0 <br /> 1,2-Dichloroethane ND 050 <br /> Ethanol ND 100 <br /> Ethylbenzene 7 5 050 <br /> Ethyl Cert-butyl ether ND 10 " <br /> Methyl tert-butyl ether 32 050 " <br /> Toluene 052 050 " ^ <br /> Xylenes(total) ND 0 50 ^ <br /> Surrogate DibromoJluoromethane 94% 84-122 " <br /> rrogate 1 2-Dichloroethane-d4 100% 74-135 <br /> arrogate Toluene-d8 101 % 84-119 ^ <br /> Surrogate 4-BromoJluorobenzene 96% 86-119 " <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 slated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 22 of 34 <br />