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C 1455 McDowell Blvd,North Ste D <br /> Sequoia u 0i'a Petaluma, 79 94954 <br /> -'��"� ''1 (707)T92-18b5 <br /> FAX Analytical wwseq 7ialabs 342 <br /> . www sequmalabs coin <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-7(P406360-07)Water Sampled 06/17/04 06 00 Received 06117/0411 50 <br /> Tert-amyl methyl ether ND 10 ug/1 1 4060657 06/30/04 06/30/04 EPA 8260B <br /> Benzene ND 050 « " <br /> Tett-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 10 " n <br /> 1,2-Dichloroethane ND 050 <br /> Ethanol ND 100 <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 n " <br /> Methyl tert-butyl ether ND 050 <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 108% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 ' 120% 74-135 " <br /> rrogate Toluene-d8 95% 84-119 <br /> rrogate 4-Bromofluorobenzene 109% 86-119 <br /> MW-8(P406360-08)Water Sampled 06/17/04 10 24 Received 06/17/0411 50 <br /> Teri-amyl methyl ether ND 10 ugA 1 4060657 06/30/04 06/30/04 EPA 8260B <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 K <br /> Ethyl tert-butyl ether ND 10 <br /> Methyl tent-butyl ether 13 050 <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 <br /> Surrogate Dibromofluoromethane 109% 84-122 " <br /> Surrogate 1 2-Dichloroethane-d4 r 112% 74-135 " <br /> Surrogate Toluene-d8 98% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 107% 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 stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 10 of 21 <br />