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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> 4D (707)792-1865 <br /> FAX 42 <br /> Analytical wwsequ7ialabs om <br /> www sequoialabs com <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 /> VW-5(P412386-07)Water Sampled 12/21/04 05 05 Received 12/21/04 09 53 <br /> Surrogate Toluene-d8 103% 84-119 5010022 01104/05 01104105 EPA 8260B <br /> Surrogate 4-Bromafluorobenzene 103% 86-119 <br /> VW-6(P412386-08)Water Sampled 12/21/04 05 16 Received 12/21/04 09 53 <br /> Tert-amyl methyl ether ND 500 ugll 500 5010022 01/04/05 01/04/05 EPA 8260B <br /> Benzene 5000 250 " <br /> Tert-butyl alcohol ND 10000 <br /> Di-isopropyl ether ND 500 <br /> 1,2-Dtbromoethane(EDB) ND 250 <br /> 1,2-Dtchloroethane ND 250 <br /> Ethanol ND 50000 <br /> Ethylbenzene ND 250 <br /> Ethyl tent-butyl ether ND 500 <br /> Methyl tent-butyl ether ND 250 <br /> luene ND 250 <br /> ylenes(total) ND 250 <br /> Surrogate Dibromofluommethane 93% 84-122 <br /> Surrogate 12-Dichloroelhane-d4 91 % 74-135 <br /> Surrogate Toluene-d8 103% 84-119 <br /> Surrogate 4-Bromafluorobenzene 105% 86-119 " <br /> DOMESTIC WELL(P412386-09)Water Sampled 12/21/04 07 36 Received 12/21/04 09 53 <br /> Tert-amyl methyl ether ND 1 0 ug/l 1 5010022 01/04/05 01/04/05 EPA 8260E <br /> Benzene ND 050 <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dtbromoethane(EDB) ND 050 <br /> 1,2-Dtchloroethane ND 050 <br /> Ethanol ND 100 <br /> Ethylbenzene ND 050 <br /> Ethyl tert-butyl ether ND 1 0 <br /> Methyl tert-butyl ether ND 050 <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 <br /> Surrogate Dtbromofluoromethane 93% 84-122 <br /> Surrogate 1,2-Dtchloroethane-d4 92% 74-135 <br /> Surrogate Toluene-d8 103% 84-119 <br /> Surrogate 4-Bromofluorobenzene 105% 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chair[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 9 of 15 <br />