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1455 McDowell Blvd North Ste D <br /> a_ _� Sequoia Petaluma,CA 94954 <br /> Analytical FAX(707)792-0362 <br /> (707)792-0342 <br /> wwwsequoialahs.com <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P305390 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 06/18/03 21:10 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Analyle Result Limit Units Dilution Batch Prepared Analyzed Method Note <br /> MW-1 (P305380-01)Water Sampled:05/19/03 10:10 Received: 05/19/03 11.45 <br /> Tert-amyl methyl ether ND 1.0 ug/l 1 3050779 05/30/03 05/31/03 EPA 8260B <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 ND 0.50 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 1.0 " <br /> Methyl tert-butyl ether 7.8 0.50 " <br /> Surrogate:Dibromofluoromethane 95% 84-122 " <br /> Surrogate: 1,2-Dichloroelhane-d4 97% 74-135 " <br /> Surrogate:Toluene-d8 99% 84-119 " <br /> MW-2(P305380-02)Water Sampled:05/19/03 09:40 Receiver!:05/19/03 11.45 <br /> Tert-amyl methyl ether ND I.0 ugll 1 3050783 05/31/03 05/31/03 EPA 8260E <br /> Okrt-butyl alcohol ND 20 <br /> i-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 /> Ethyl tert-butyl ether ND 1.0 " <br /> Methyl tent-butyl ether ND 0.50 " <br /> Surrogate:Dibromofluoromethane 95% 84-122 " <br /> Surrogate: 1,2-Dichloroethane-d4 97% 74-135 " <br /> .Surrogate: Toluene-d8 98% 84-119 " <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 13 of 36 <br />