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' 1455 McDowell Blvd,North Ste D <br /> a_ _� Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs 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 /> MW-5(P406360-05)Water Sampled 06/17/04 08 02 Received 06/17/04 11 50 <br /> Teri-amyl methyl ether ND 10 ugll 1 4060657 06/30/04 06/30/44 EPA 8260E <br /> Benzene ND 050 <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dichloroethane ND 050 <br /> Ethanol ND 100 ^ " <br /> Ethylbenzene ND 050 <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 050 <br /> Surrogate Dibromofluaromethane 105% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 112% 74-135 <br /> 0rogate Toluene-d8 99% 84-119 <br /> rrogate 4-Bromofluorobenzene 108% 86-119 <br /> MW-6(P406360-06)Water Sampled 06/17/04 06 18 Received 06/17/04 11 50 <br /> Teri-amyl methyl ether ND 10 ug/l I 4060657 06/30/04 06/30/04 EPA 8260B <br /> Benzene ND 050 n " <br /> Tert-butyl alcohol ND 20 " <br /> Dt-isopropyl ether ND 10 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tent-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 <br /> Xylenes(total) 059 050 " <br /> Surrogate Drbromofluoromethane 105% 84-122 " <br /> Surrogate 1 2-Dichloroethane-d4 115% 74-135 " <br /> Surrogate Toluene-d8 99% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 103% 86-119 j <br /> i <br /> I <br /> I <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 stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 9 of 21 <br />