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n1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA94954 <br /> 79 <br /> (707)792-1665 <br /> Analytical FAX{70 )792-0342 <br /> ialabs.com <br /> wwwsequoialabs.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 Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-2 P304543-01 Water Sampled-04/24/03 53:10 Received:04/25/03 14:30 <br /> Tert-amyl methyl ether ND 1.0 ugll 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 0.50 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 1.0 " <br /> Methyl tert-butyl ether 30 0.50 " <br /> Surrogate:Dibromofluoromethane 106% 84-122 <br /> Surrogate:1,2-Dichloroethane-d4 106% 74-135 <br /> Surrogate:Toluene-d8 111 % 84-119 " <br /> MW-3 P304543-02 Water Sampled:04/24/0310:50 Received.0412510314:30 <br /> Tert-amyl methyl ether ND 1.0 ugl] 1 3050175 05/06/03 05!07!03 EPA 8260B <br /> Tert-butyl alcohol ND 20 <br /> 02I-Isopropyl ether ND 1.0 <br /> Dibromoethane(EDB) ND 0.50 " <br /> , -Dichloroethane ND 0.50 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 1.0 " <br /> Methyl tert-butyl ether ND 0.50 <br /> Surrogate:Dibromofluoromethane 103% 84-122 " <br /> Surrogate:1,2-Dichloroethane-d4 111% 74-135 <br /> Surrogate: Toluene-& 108% 84-119 " <br /> I <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 />