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E455 McDowell Blvd North Ste <br /> D Sequoia Petaluma CA 949544 <br /> ( (707)792 1865 <br /> Analytical FAX(707)792-0342 <br /> • www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 5469,Stockton,CA P412205 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0290 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 01/01/05 14 06 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Note <br /> MW-1 (P412205-01)Water Sampled 12/09/04 06 19 Received 12/09/04 09 20 <br /> Tert-amyl methyl ether ND 1 0 ug/l 1 4120414 12/20/04 12/20/04 EPA 8260B <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether 5 6 0 50 " <br /> Toluene ND 0 50 <br /> Xylenes(total) ND 0 50 <br /> Surrogate Dtbromof7uoromethane 92% 84-122 <br /> rrogate 1,2-Drchloroethane-d4 97% 74-135 " " <br /> 11 <br /> rrogate Toluene-d8 91% 84-119 <br /> Surrogate 4-Bromofluorobenzene 97% 86-119 <br /> MW-3(P412205-02)Water Sampled 12/09/04 06 09 Received 12/09/04 09 20 <br /> Tert-amyl methyl ether ND 1 0 ugA 1 4120414 12/20/04 12/20/04 EPA 8260B <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether 18 050 " <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 " <br /> Surrogate Dtbromofluoromethane 100% 84-122 <br /> Surrogate 1,2-Drchloroethane-d4 107% 74-135 <br /> Surrogate Toluene-d8 99% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 106% 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the cltarn of <br /> 10 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 6 of 21 <br />