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S eq u Ora 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> AA (707)792-1865 <br /> nalytical FAX(707)792-0342 <br /> www.sequoiniabs.com <br /> URS Corp-Sacramento Project:Arco Site 2130,Stockton,CA P504010 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number:CTOBZK-0002 Reported: <br /> Sacramento CA,95833 Project Manager:yemon P.Elarth 04/13/05 09:46 <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-1(P504010-01)Water Sampled:03/28/05 10:15 Received:03/3010511:50 <br /> Tert-amyl methyl ether ND 1.0 ug/I 1 5040040 04/05/05 04/05/05 EPA 8260B <br /> Benzene ND 0.50 <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1.0 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0.50 " <br /> Ethyl tert-butyl ether ND Lo " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.54 " <br /> Surrogate:Dibrornofluoromethane 108% 84-122 " <br /> Surrogate: 1,2-Dichloroethane-d4 112% 74-135 " <br /> Surrogate: Toluene-d8 101% 84-119 " <br /> +urrogate:4-Bromafluorobenzene 110% 86-119 <br /> MW-2(P504070-02)Water Sampled:03/28/0511:15 Received:03/30/05 11:50 <br /> 'Pert-amyl methyl ether ND 1.0 ugll 1 5040050 04/06/05 04/06/05 EPA 9260B <br /> Benzene ND 0.50 11 " " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1.0 " <br /> 1,2-Dichloroethane 27 0.50 <br /> Ethanol i ND 100 <br /> Ethylbenzene . ND 0.50 " <br /> Ethyl Cert-butyl ether ND 1.0 " <br /> Methyl tert-butyl ether 0.65 0.50 " <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:Dibromofluoromethane 100% 84-122 <br /> Surrogate:1,2-Dichloroethane-d4 99% 74-135 <br /> Surrogate:Toluene-d8 97% 84-119 " <br /> Surrogate:4-Bromofluorobenzene 108% 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 7 of 29 <br /> ' - w <br />