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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> 4D (707)792-1865 <br /> Analytical wr�wnv equw sequ7)792-0342 <br /> ooalabs corn <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA 1`412386 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0287 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 01111105 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-13(P412386-04RE1)Water Sampled 12/21/04 06 59 Received 12/21/04 09 53 CL <br /> Benzene 190 10 ug/l 20 5010096 01/07/05 01/07/05 EPA 8260B <br /> Surrogate Dibromofluoromethane 120% 84-122 <br /> Surrogate 12-Dichloroethane-d4 112% 74-135 <br /> Surrogate Toluene-d8 103% 84-119 <br /> Surrogate 4-Bromofluorobenzene 108% 86-119 <br /> VW-2(P412386-05)Water Sampled 12/21/04 06 37 Received 12/21/04 09 53 <br /> Tert-amyl methyl ether ND 100 08/1 100 5010022 01/04/05 01/04/05 EPA 8260B <br /> Tert-butyl alcohol ND 2000 <br /> Di-isopropyl ether ND 100 " <br /> 1,2-Dibromoethane(EDB) ND 50 <br /> 1,2-Dichloroethane ND 50 " <br /> Ethanol ND 10000 " <br /> thylbenzene 710 50 " <br /> hyl tert-butyl ether ND 100 <br /> Methyl tert-butyl ether 120 50 <br /> Toluene 1800 50 <br /> Xylenes(total) 6300 50 <br /> Surrogate Dibromofluoromethane 93% 84-122 <br /> Surrogate 1 2-Dtchloroethane-d4 90% 74-135 " <br /> Surrogate Toluene-d8 103% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 103% 86-119 " <br /> VW-2(P412386-05RE1)Water Sampled 12/21/04 06 37 Received 12/21/04 09 53 CL <br /> Benzene 6400 120 ug/I 250 5010096 01/07/05 01/07/05 EPA 82606 <br /> Surrogate Dibromofluoromethane 122% 84-122 <br /> Surrogate 12-Dichloroelhane-d4 112% 74-135 <br /> Surrogate Toluene-d8 104% 84-119 <br /> Surrogate 4-Bromofluorobenzene 108% 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 be reproduced in its entirety <br /> Page 7 of 15 <br />