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1455 McDowell Blvd,North Ste D <br /> Se11 <br /> la Petaluma,CA94954 <br /> 79 <br /> (707)792-1865 <br /> r Analytical FAX(707)792-0342 <br /> www,sequoialabs.com <br /> RS Corp-Sacramento Project: Arco Site 5450,Stockton,CA P304543 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36604 Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 05/09/03 15:37 <br /> Volatile Organic Compounds by EPA Metbod 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW4 304543-03 Water Sampled:0412410311:30 Received:04/25/0314:30 <br /> Tert-amyl methyl ether ND 1.0 ug/l 1 3050175 05/06/03 05/07/03 EPA 8260B <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1.0 " <br /> 1,2-Dibromoethane(EDB) ND 0.54 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 1.0 " <br /> Methyl tert-butyl ether 0.66 0.50 " <br /> Surrogate:Dibromofluoromethane 108% 84-111 " <br /> Surrogate:1,2-Dichloroethane-d4 114% 74-135 " <br /> Surrogate: Toluene-d8 104% 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 5 of 9 <br />