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Sequoia <br /> 1455 McDowell Blvd North Ste <br /> t-7QgijQ1'd Petaluma,CA 949544 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342342 <br /> www sequoiaiabs com <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P406360 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/29/04 07 39 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared' Analyzed Method Not <br /> VW-1B(P406360-09)Water Sampled 06/17/04 09 31 Received 06/17/0411 50 <br /> Tert-amyl methyl ether ND 20 ugh 20 4060657 06/30/04 06/30/04 EPA 8260B <br /> Benzene ND 10 " <br /> Tert-butyl alcohol ND 400 " <br /> Di-isopropyl ether ND 20 " <br /> 1,2-Dichloroethane ND 10 " <br /> Ethanol ND 2000 " <br /> Ethylbenzene ND 10 <br /> Ethyl tert-butyl ether ND 20 " <br /> Methyl tert-butyl ether 620- 10 " <br /> Toluene ND 10 <br /> Xylenes(total) ND 10 <br /> Surrogate Dibromofluoromethane 110% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 121 % 74-135 " <br /> rrogate Toluene-d8 99% 84-119 <br /> urrogate 4-Bromofluorobenzene 107% 86-119 " <br /> VW-213(P406360-10)Water Sampled 06/17/04 10 11 Received 06/17/04 11 50 <br /> Tert-amyl methyl cther ND 50 ug/l 5 4060657 06/30/04 06/30/04 EPA 8260B <br /> Benzene ND 2 5 <br /> Tert-butyl alcohol ND 100 <br /> Di-isopropyl ether ND 5 0 " <br /> 1,2-Dichloroethane 3 4 2 5 " » <br /> Ethanol ND 500 " <br /> Ethylbenzene ND 25 " <br /> Ethyl tert-butyl ether ND 5 0 <br /> Methyl tert-butyl ether 210 2 5 " <br /> Toluene ND 25 " <br /> Xylenes(total) ND 25 " <br /> Surrogate Dibromofluoromethane 109% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 123% 74-135 " <br /> Surrogate Toluene-d8 100% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 111 % 86-119 " <br />,Sequo,a <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 11 of 21 <br />