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jZ�Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> Analytical (707)792-1865 <br /> FAX(707)792.0342 <br /> wwwsequoialabs.com <br /> C <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 /> VW-2(P504010-09)Water I Sampled:03/27/05 07:50 Received:03/3010511:50 <br /> Tert-amyl methyl ether ND 5.0 ug/l 5 5040040 04/05/05 04/05/05 EPA 8260B <br /> Benzene ND 2.5 <br /> Tett-butyl alcohol ND 100 " <br /> Di-isopropyl ether ND 5.0 <br /> 1,2-Dichloroetbane 15 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 " <br /> Xylenes(total) ND 2.5 ^ <br /> Surrogate:Dibromofluoromethane 96% 84-122 " <br /> Surrogate:1,2-Dichloroethane-d4 101% 74-135 " <br /> Surrogate:Toluene-d8 95% 84-119 " <br /> Surrogate:4-Bromofluorobenzene 105% 86-119 " <br /> VW-3(P504070-10)Water Sampled:03/28/05 13:20 Received:03/30/@511-.50 <br /> Tort-amyl methyl ether ND 1.0 ugh 1 5040050 04/06/05 04/06/05 EPA 8260B <br /> Benzene ND 0.50 " <br /> r <br /> Teri-butyl alcohol ND 20 " <br /> Di-isopropyl 6 ther ND 1.0 <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethanol ND 100 <br /> Ethylbenzene 1.0 0.50 " <br /> Ethyl tent-butyl ether ND 1.0 " <br /> Methyl tert-butyl ether 1.9 0.50 " <br /> Toluene ND 0.50 <br /> Xylenes(total) 0.62 0.50 " <br /> Surrogate:Dibromofluoromethane 99% 84-122 " <br /> Surrogate: 1,1-Dichloroethane-d4 103% 74-135 " <br /> Surrogate: Toluene-d8 90% 84-119 " <br /> Surrogate:4-Bromofluorobenzene 99% 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 /> C) This analytical report must be reproduced in its entirety. <br /> Page 11 of 29 <br />