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j`` Sequoia 1455 McDowell Blvd,North Ste <br /> ""r'1' Petaluma,CA 949544 <br /> 1865 <br /> vAW Analytical {707)792- <br /> Analytical <br /> FAX(707)79Z-03420342 <br /> www.sequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P309139 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 10/16/03 19:28 <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-3(P309139-03)Water Sampled:09/09/03 05:44 Received: 0910910310:20 <br /> Tert-amyl methyl ether ND 1.0 ugll 1 3090409 09/118/03 09118103 EPA 8260B <br /> Benzene ND 4.50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1.0 " <br /> 1,2-Dibromoethane(EDB) ND 0.50 " <br /> I,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 2.1 0.50 " <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:Dibromofluoromethane 108% 84-122 " <br /> Surrogate: 1,2-Dichloroethane-d4 115% 74-135 " <br /> 0-st'rrogate: <br /> rrogate: Toluene-d8 94% 84-119 <br /> 4-Bromofluorobenzene 104% 86-119 <br /> MW-4(P309139-04)Water Sampled:09/09/03 08:05 Received: 0910910310:20 <br /> Tert-amyl methyl ether ND 500 ugll 500 3090481 09/22/03 09/22/03 EPA 8260B <br /> Benzene 1700 250 " <br /> Tert-butyl alcohol ND 10000 " <br /> Di-isopropyl ether ND 500 " <br /> 1,2-Dibromeethane(EDB) ND 250 " <br /> 1,2-Diehloroethane ND 250 " <br /> Ethanol ND 50000 " <br /> Ethylbenzene ND 250 <br /> Ethyl tert-butyl ether NO 500 " <br /> Methyl tert-butyl ether 22000 250 " <br /> Toluene NO 250 <br /> Xylenes(total) ND 250 " <br /> Surrogate:Dibromofluoromethane 96% 84-122 " <br /> Surrogate: 1,2-Dichloroethane-d4 87% 74-135 " <br /> Surrogate: Toluene-d8 101 % 84-119 11 " <br /> Surrogate:4-Bromofluorobenzene 99% 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 staled,results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> Page 13 of 38 <br />