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1455 McDowell BlvdCA Ste <br /> ta) Sequoia Petaluma CA 949544 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequo,alabs cpm <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P312396 <br /> 2870 Gateway Oaks Drive Suite 300 Protect Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/09/04 18 12 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Analyle Result Limit Units Dilution Batch Prepared Analyzed - Method Notes <br /> MW-4(P312396-04RE1)Water Sampled 12/11/03 09 15 Received 12/12/03 08 20 HT-04 <br /> Methyl tert-butyl ether 6400 100 ugA 200 3120744 12/29/03 12/29/03 EPA 8260B <br /> Surrogate Dtbromofluoromelhane 106% 84-122 " <br /> Surrogate 12-Dtchloroethane-d4 99% 74-135 " <br /> Surrogate Toluene-d8 104% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 100% 86-119 " <br /> MW-5(P312396-05)Water Sampled 12/11/03 07 21 Received 12/12/03 08 20 <br /> Tert-amyl methyl ether ND 10 ug/l 1 3120714 12/25/03 12/25/03 EPA 8260B <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 ^ " <br /> 1,2-Dtchloroethane ND 050 " <br /> Ethanol ND 100 " <br /> hylbenzene ND 050 " <br /> hyl tert-butyl ether ND 10 <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 " <br /> Surrogate Drbromofluoromethane 104% 84-122 " <br /> Surrogate 1 2-Dichloroelhane-d4 107% 74-135 " <br /> Surrogate Toluene-d8 92% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 100% 86-119 " <br /> MW-6(P312396-06)Water Sampled 12/11/03 06 37 Received 12/12/03 08 20 <br /> Tert-amyl methyl ether ND 10 ugA 1 3120714 12/25/03 12/25/03 EPA 82606 <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100, <br /> Ethylbenzene ND 050 " <br /> Ethyl Cert-butyl ether ND 10- <br /> Methyl <br /> 0-Methyl tent-butyl ether ND 050 " <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 <br /> Surrogate Dibromofluoromethane 104% 84-122 " <br /> Surrogate 1 2-Dtchloroethane-d4 109% 74-135 " <br /> Surrogate Toluene-d8 91% 84-119 " <br /> 4Vquoia <br /> 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 17 <br />