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e9 u `� 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> (707)792-1865 <br /> IwoAnalytical FAX(707) 42 <br /> www.sequoialabs.clabs.com <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P309139 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 10/16/03 19:28 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-9(P309139-09)Water Sampled:09/09/03 03:31 Received:09/09/03 10:20 <br /> Tert-amyl methyl ether ND i.0 ugll 1 3090409 09/18/03 09/18/03 EPA 82608 <br /> Benzene ND 0.50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1.0 " <br /> 1,2-Dibromoethane(EDB) ND 0.50 " <br /> 1,2-Dichloroethane 6.0 0.50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0.50 " <br /> Ethyl tert-butyl ether ND 1.0 " <br /> Methyl tert-butyl ether 0.70 0.50 " <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:Dibromofluoromethane 107% 84-122 " <br /> 4urrogate: 1,2-Dichloroethane-d4 118% 74-135 <br /> rrogate: Toluene-d8 95% 84-119 <br /> Surrogate:4-Bromofluorobenzene 105% 86-119 <br /> MW-10(P309139-10)Water Sampled:09/09/03 04:17 Received:09/09/03 10:20 <br /> Tert-amyl methyl ether ND 50 ugll 50 3090442 09/19/03 09/19/03 EPA 8260B <br /> Benzene 40 25 " t. " <br /> Tert-butyl alcohol ND 1000 " <br /> Di-isopropyl ether ND 50 " <br /> 1,2-Dibromoethane(EDB) ND 25 " <br /> 1,2-Dichloroethane ND 25 " <br /> Ethanol ND 5000 " <br /> Ethylbenzene ND 25 " <br /> Ethyl tert-butyl ether ND 50 " <br /> Methyl tert-butyl ether 790 25 " <br /> Toluene ND 25 " <br /> Xylenes(total) ND 25 " <br /> Surrogate:Dibromofluoromethane 107% 84-122 " <br /> Surrogate: 1,2-Dichloroethane-d4 115% 74-135 " <br /> Surrogate: Toluene-d8 97% 84-119 " <br /> Surrogate:4-Bromofluorohenzene 106% 86-119 " <br /> The results in this report apply to the samples analyzed in accordance with the chain o <br /> Sequoia Analytical-Petaluma p pp y p YZ 1 <br /> custody document, Unless otherwise stated,results are reported on a wet weight basis, <br /> 0 This analytical report must be reproduced in its entirety. <br /> Page 16 of 38 <br />