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Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA94954 <br /> 79 <br /> (707)792-!865 <br /> FAX Analytical ww.seq 7)labs.w 2 <br /> www.secluoialabs.com <br /> URS Corp-Sacramento Project:Arco Site 5450,Stockton,CA P405282 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number:WR36604 Reported: <br /> Sacramento CA,95833 Project ManagerMermon P.Elarth 06/02/04 14:08 <br /> Volatile Organic Compounds by EPA Method 8260D <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Analyte Result Limit [Snits Dilution Batch Prepared Analyzed Method Notes <br /> MW-2(P405282-01)Water Sampled:05/11/04 13:45 Received:05/12/0407-20 <br /> Tert-amyl methyl ether ND 1.0 ugA 1 4050590 05/24/04 05/25/04 EPA 8260B <br /> Benzene ND 0.50 " <br /> Teri-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND I.0 <br /> 1,2-Dibromoethane(EDB) ND 0.50 <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0.50 " <br /> Ethyl tert-butyl ether ND 1.0 " <br /> Methyl tert-butyl ether 4.2 0.50 <br /> Toluene ND. 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:Dibromofluoromethane 98% 84-122 " <br /> 0rrogale: 1,2-Dichloroethane-d4 104% 74-135 <br /> rrogate: Toluene-d8 90% 84-119 <br /> Surrogate:4-Bromofluorobenzene 97% 86-119 " <br /> MW-3(P405282-02)Water Sampled:05/11/04 13:00 Received:05/12/04 07:20 <br /> Tert-amyl methyl ether ND 1.0 ug/l 1 4050590 05/24/04 05/25/04 EPA 8260B <br /> Benzene ND 0.50 " <br /> Teri-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1.0 <br /> 1,2-Dibromoethane(EDB) ND 0.50 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0.50 " <br /> Ethyl tert-butyl ether ND I.0 <br /> Methyl tert-butyl ether ND 0.50 " <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.50 <br /> Surrogate,Dibromofluoromethane 97% 84-122 " <br /> Surrogate:1,2-Dichloroethane-d4 106% 74-135 " <br /> Surrogate: Toluene-d8 89% 84-119 " <br /> Surrogate:4-Bromofluorobenzene 100% 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 4 of 9 <br />