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• Sequoia 1455 McDowPeBlvd <br /> luma,CA 949544 <br /> 4DFX(707)792-1865 <br /> Analytical wwseq 7ialabs 342 <br /> arywv sequoia[a6s corn <br /> URS Corp-Sacramento Protect Arco Site 6100,Tracy,CA P406422 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay 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 4 3 2 5 " " " " " <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 2 5 " <br /> Ethanol ND 500 " <br /> Ethylbenzene ND 2 5 " <br /> Ethyl tert-butyl ether ND 5 0 " <br /> Methyl tert-butyl ether ND 2 5 " <br /> Toluene ND 2 5 1. " <br /> Xylenes(total) 3 6 2 5 " " <br /> Surrogate Dtbromofluoromethane 93% 84-122 " <br /> Surrogate 12-Dtchloroethane-d4 86% 74-135 <br /> 0 rrogate Toluene-d8 97% 84-119 "" ,I <br /> rrogate 4-Bromofluorobenzene 100% 86-119 <br /> 117W-15(P406422-06)Water Sampled 06/22/0407 12 Received 06/22/04 12 15 PH <br /> Tert-amyl methyl ether ND 1000 ug/l 1000 4070035 07/02/04 07/02/04 EPA 8260B <br /> Benzene 13000 500 " 11 " <br /> Tert-butyl alcohol ND 20000 " 11 " <br /> Di-isopropyl ether ND 1000 1. <br /> 1,2-Dibromoethane(EDB) ND 500 " <br /> 1,2-Di chloroethane ND 500 " <br /> Ethanol ND 100000 " <br /> Ethylbenzene 3200 500 " <br /> Ethyl tert-butyl ether ND 1000 " <br /> Methyl tert-butyl ether ND 500 " <br /> Toluene 33000 500 " <br /> Xylenes(total) 21000 500 " <br /> Surrogate Dibromofluoromethane 92% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 88% 74-135 <br /> Surrogate Toluene-d8 101 % 84-119 <br /> Surrogate 4-B)omofluorobenzene 103 % 86-119 <br /> quota Analytical -Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody docunient Unless otherwise stated, results are reported on a Iver weight basis <br /> This analytical report must he reproduced in as entirety <br /> Page 7 of 18 <br />