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1455 McDowell Blvd North Ste <br /> Sequoia Petaluma CA 949544 <br /> (707)792 1865 <br /> Analytical FAX792 0342 <br /> www sequoiequoialabs cam <br /> URS Corp-Sacramento Project Arco Site 6100 Tracy CA P503196 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0287 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 03/25/05 17 38 <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-6(P503196-09)Water Sampled 03/15/05 05 32 Received 03/15/05 12 30 <br /> Tert-amyl methyl ether ND t00 ug/l 100 5030210 03/21/05 03/21/05 EPA 9260B <br /> Benzene 1900 50 " <br /> Tert-butyl alcohol ND 2000 " <br /> Di-isopropyl ether ND 100 " <br /> 1,2-Dibromoethane(EDB) ND 50 " <br /> 1,2-Dichloroethane 88 50 " <br /> Ethanol ND 10000 " <br /> Ethylbenzene ND 50 " <br /> Ethyl tert-butyl ether ND 100 " <br /> Methyl tert-butyl ether 170 50 " <br /> Toluene ND 50 " <br /> Xylenes(total) 83 50 " <br /> Surrogate Dibromofluoromethane 97% 84-122 " <br /> rrogate 1,2-Dtchloroethane-d4 94% 74-135 ,I <br /> rrogate Toluene-d8 96% 84-119 <br /> Surrogate 4-Bromofluorobenzene 102% 86-119 " <br /> Domestic Well(P503196-10)Water Sampled 03/15/05 06 27 Received 03/15/05 12 30 <br /> Tert-amyl methyl ether ND 1 0 U10 1 5030212 03/21/05 03/21/05 EPA 8260B <br /> Benzene ND 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <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 tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 118% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 119% 74-135 " <br /> Surrogate Toluene-d8 106% 84-119 " <br /> Surrogate 4-Bromojluorobenzene III % 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 to its entirety <br /> Page 9 of 18 <br />