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1 <br />' 1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> 15) (747)792 1865 <br /> FAX Analytical wwseq 7ialabs 342 <br /> www sequoialabs coin <br /> URS Corp-Sacramento Project Arco Site 2186, Stockton,CA P312396 <br /> 2820 Gateway Oaks Drive Suite 300 Project 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 /> Analyte Result Limit Units Dilution Batch Prepared Analyzed - Method Notes <br /> MW-2(P312396-02)Water Sampled 12/11/03 06 10 Received 12/12/03 08 20 <br /> Surrogate 4-Bromafluorobenzene 98% 86-119 3120714 12/25/03 12125103 EPA 8260E <br /> MW-3(P312396-03)Water Sampled 12/11/03 05 25 Received 12/12/03 08 20 <br /> Tert-amyl methyl ether ND I Q ugA 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 0 50 " <br /> Ethanol ND 100 " <br /> Ethyibenzene ND 050 <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tent-butyl ether 081 0 50 " <br /> Toluene ND 050 " <br /> ylenes(total) 084 0 50 <br /> rrogate Dibromofluoromethane 104% 84-122 " <br /> Surrogate 1 2-Dtchloroethane-d4 105% 74-135 <br /> Surrogate Toluene-d8 91 % 84-119 " <br /> Surrogate 4-Bromofluorobenzene 97% 86-119 " <br /> MW4(P312396-04)Water Sampled 12/11/03 09 15 Received 12/12/03 08 20 <br /> Tert-amyl methyl ether ND 100 ug/l 100 3120714 12/25/03 12/25/03 EPA 82608 <br /> Benzene ND 50 <br /> Tert-butyl alcohol ND 2000 " <br /> Di-isopropyl ether ND 100 <br /> 1,2-Dichloroetbane 110 50 " <br /> Ethanol ND 10000 <br /> Ethylben7ene ND 50 <br /> Ethyl tert-butyl ether ND 100 " <br /> Methyl tert-butyl ether 6500 50 " E <br /> Toluene ND 50 " <br /> Xylenes(total) ND 50 " <br /> Surrogate Dibromofluoromethane 106% 84-122 " <br /> Surrogate 1 2-Dichloroethane-d4 106% 74-135 " <br /> Surrogate Toluene-d8 90% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 100% 86-119 " <br /> equola 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 6 of 17 <br />