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- i <br /> Sequoia 1455 McDowell Blvd North Ste <br /> a CA94 <br /> Petaluma CA 94954 <br /> }-- ^' (707)792 1865 <br /> Analytical FAX(707)792 0342 <br /> www sequoralabs com <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P406422 <br /> 2870 Gateway Oaks Drive Suite 300 Protect Number WR36619 [reported <br /> Sacramento CA,95833 Project Manager .lay Johnson 07/15/04 10 23 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Note <br /> MW-13(P406422-05)Water Sampled 06/22/04 06 43 Received 06/22/04 12 15 <br /> Tert-amyl methyl ether ND 50 ug/l 5 4070035 07/02/04 07/02/04 EPA 8260B <br /> Benzene 43 25 <br /> Tert-butyl alcohol ND 100 " <br /> Di-isopropyl ether ND 5 0 " <br /> 1,2-Dibromoethane(EDB) ND 25 " <br /> 1,2-Dichloroethane ND 25 " <br /> Ethanol ND 500 " <br /> Ethylbenzene ND 25 " <br /> Ethyl tert-butyl ether ND 5 0 " <br /> Methyl tert-butyl ether ND 2 5 <br /> Toluene ND 2 5 " <br /> Xylenes(total) 3 6 2 5 <br /> Surrogate Dibromofluoromethane 93% 84-122 <br /> gate 1 2-Dichloroethane-d4 86% 74-135 <br /> gate Toluene-d8 97% 84-119 <br /> Surrogate 4-Bromofluorohenzene 100% 86-119 <br /> MW-15(P406422-06)Water Sampled 06/22/04 07 12 Received 06/22/04 12 15 PH <br /> Tert-amyl methyl ether ND 1000 ugll 1000 4070035 07/02/04 07/02/04 EPA 82608 <br /> Benzene 13000 500 " <br /> Tert-butyl alcohol ND 20000 " <br /> Di-isopropyl ether ND 1000 " <br /> 1,2-Dibromoethane(EDB) ND 500 " <br /> 1,2-Dichloroethane ND 500 " <br /> Ethanol ND 100000 <br /> Ethylbenzene 3200 500 " <br /> Ethyl tert-butyl ether ND 1000 <br /> Methyl tent-butyl ether ND 500 " <br /> Toluene 33000 500 " <br /> Xylenes(total) 21000 500 <br /> Surrogate Drbromofluoromethane 92% 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 88% 74-135 <br /> Surrogate Toluene-d8 101 % 84-119 <br /> Surrogate 4-Bromofluorobenzene 103% 86-119 " <br /> �uola Analytical-Petaluma The results to this report apply to the samples analyzed in accordance with the charas of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced to its entirety <br /> Page 7 of 18 <br />