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1455 McDowell Blvd North Ste <br /> Sequoia Petaluma CA 949544 <br /> (707)792 1865 <br /> FAX(707)792-0342 <br /> Analytical. www sequoialabs corn <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-2(P412205-03)Water Sampled 12/09/04 06 02 Received 12/09/04 09 20 <br /> Tert-amyl methyl ether ND 10 ug/l 1 4120414 12/20/04 12/20/04 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 050 " <br /> 1,2-Dichloroethane ND 0 56 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tent-butyl ether ND 050 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 0 50 " <br /> Surrogate Dibromofluoromethane 98% 84-122 <br /> rrogate 1 2-Dtchloroethane-d4 106% 74-135 " <br /> rrogate Toluene-d8 98% 84-119 <br /> Surrogate 4-Bromofluorobenzene 107% 86-119 " <br /> MW-4(P412205-04)Water Sampled 12/09/04 06 30 Received 12/09/04 09 20 <br /> Tert-amyl methyl ether ND 500 ug/l 500 4120414 12/20/04 12/20/04 EPA 8260B <br /> Benzene 2500 250 " <br /> Tert-butyl alcohol ND 10000 " <br /> Di-isopropyl ether ND 500 " <br /> 1,2-Dibromoethane(EDB) ND 250 " <br /> 1,2-Dtchloroethane ND 250 " <br /> Ethanol ND 50000 " <br /> Ethylbenzene ND 250 " <br /> Ethyl tert-butyl ether ND 500 <br /> Methyl tert-butyl ether 20000 250 " <br /> Toluene ND 250 " <br /> Xylenes(total) ND 250 " <br /> Surrogate Dibromofluoromelhane 99% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 107% 74-135 " <br /> Surrogate Toluene-d8 100% 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 chain of <br /> . custody document Unless otherwise slated results are reported on a wet weight basis <br /> Thts analytical report must be reproduced in its entirety <br /> Page 7 of 21 <br />