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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (707)792 1865 <br /> Analytical FAX(707)792 0342 <br /> www sequoialabs coin <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P412386 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0287 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 01/11/05 08 02 <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-2(P412386-01)Water Sampled 12/21/04 05 35 Received 12/21/04 09 53 <br /> Tert-amyl methyl ether ND 1 0 ug/I 1 5010022 01/04/05 01/04/05 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 0 50 " <br /> 1,2-Dichloroethane ND 0 50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tent-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 0 50 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromelhane 93% 84-122 " <br /> 0rrogate 1,2-Dichloroethane-d4 91% 74-135 <br /> rrogate Toluene-d8 104% 84-119 <br /> Surrogate 4-Bromofluorobenzene 103% 86-119 " <br /> MW-10(P412386-02)Water Sampled 12/21/04 07 05 Received 12/21/04 09 53 <br /> Tert-amyl methyl ether ND 200 ug/l 200 5010022 01/04/05 01/04/05 EPA 8260B <br /> Benzene 3900 100 " <br /> Tert-butyl alcohol ND 4000 " <br /> Di-isopropyl ether ND 200 " <br /> 1,2-Dibromoethane(EDB) ND 100 " <br /> 1,2-Dichloroethane 150 100 <br /> Ethanol ND 20000 " <br /> Ethylbenzene 440 I00 " <br /> Ethyl tert-butyl ether ND 200 " <br /> Methyl tert-butyl ether ND 100 " <br /> Toluene 4500 100 " <br /> Xylenes(total) 8700 100 " <br /> Surrogate Dtbromofluaromethane 95% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 92% 74-135 " <br /> Surrogate Toluene-d8 103% 84-119 <br /> Surrogate 4-Bromofluorobenzene 104% 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 stated results are reported on a wet weight basis <br /> This analytical report must he reproduced in its entirety <br /> Page 5 of 15 <br />