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Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> Analytical ('°''' -1865 <br /> FAX(707)792-0342 <br /> www.sequoial abs.cotn <br /> 0 <br /> it <br /> URS Corp-Sacramento Project.-Arco Site 2130,Stockton,CA P504010 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number:GOBZK-0002 Reported: <br /> Sacramento CA,95833 Project Manager:Vernon 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-7(P504010-07)Water: Sampled:03/28/05 12:35 Received:03/30/05 11:50 � <br /> Tert-amyl methyl ether ND 1.0 ug/l 1 5040050 04/06/05 04/06/05 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 tort-butyl ether ND 1.0 <br /> Methyl tert-butyl ether ND 0.50 ^ " <br /> Toluene ND 0.50 <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:Dibromofluoromethane 101 % 84-122 " <br /> Surrogate:1,2-Dichloroethane-d4 104% 74-135 " <br /> Surrogate: Toluene-d8 97% 84-119 " <br /> QCurrogate:4-Bromofluorobetzzene 103% 86-119 <br /> VW-1(P504010-08)Water Sampled:03/28/05 14:35 Received:03/30/05 11.50 <br /> Tert-amyl methyl ether ND 1.0 ug/l 1 5040050 04/06/05 04/06/05 EPA 8260B <br /> Benzene ND 0.50 " <br /> Tert-butyl alcohol 22 20 ^ <br /> Di-isopropyl ether ND 1.0 " <br /> 1,2-Dichloroethane 0.64 0.50 " <br /> Ethanol ND 100 <br /> Ethylbenzene 22 0.50 " <br /> Ethyl tert-butyl ether ND 1.0 <br /> Methyl tert-butyl ether 9.8 0.50 " <br /> Toluene ND 0.50 <br /> Xylenes(total) 85 0.50 <br /> Surrogate:Dibromofluoromethane 101 % 84-122 " <br /> Surrogate:1,2-Dichloroethane-d4 105% 74-135 " <br /> Surrogate:Toluene-d8 110% 84-119 <br /> Surrogate:4-Bromofluorobenzene 118% 86-719 " <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 29 <br />