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Sequoia 1455 McdowP Blvd North Ste <br /> Petaluma,CA 949544 <br /> (707)792-1965 <br /> Analytical FAX(707)792-0342 <br /> www sequotalabs com <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P309112 <br /> 3017 Kilgare Road Suite 100 Project Number 30732 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 09/16/03 18 59 <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 /> EW-3(P309112-03)Water Sampled 09/05/03 10 58 Received 09/05/03 14 10 <br /> Tert-amyl methyl ether ND 100 ug/l 100 3090291 09/14/03 09/14/03 EPA 8260B <br /> Benzene ND 50 " <br /> Tert-butyl alcohol ND 2000 <br /> Di-isopropyl ether ND 100 " <br /> 1,2-Dibromoethane(EDB) ND 50 " <br /> 1,2-Dichloroethane ND 50 " <br /> Ethanol ND 10000 <br /> Ethylbenzene 120 50 " <br /> Ethyl tert-butyl ether ND 100 " <br /> Methyl tert-butyl ether 2700 50 " <br /> Toluene 56 50 " <br /> Xylenes(total) 750 50 " <br /> Surrogate Dibromofluoromethane 109% 84-122 " <br /> •Surrogate 12-Dichloroethane-d4 102% 74-135 <br /> Surrogate Toluene-d8 103% 84-119 " <br /> Surrogate 4-BromoJluorobenzene 100% 86-119 " <br /> EW-7(P309112-04)Water Sampled 09/05/03 02 29 Received 09/05/03 14 10 <br /> Tert-amyl methyl ether ND 5000 ug/l 5000 3090336 09/16/03 09/16/03 EPA 8260B <br /> Benzene ND 2500 " <br /> Tert-butyl alcohol ND 100000 " <br /> Di-isopropyl ether ND 5000 " <br /> 1,2-Dibromoethane(EDB) ND 2500 " <br /> 1,2-Dtchloroethane ND 2500 " <br /> Ethanol ND 500000 " <br /> Ethylbenzene ND 2500 " <br /> Ethyl tert-butyl ether ND 5000 " <br /> Methyl tert-butyl ether 170000 2500 " <br /> Toluene ND 2500 " <br /> Xylenes(total) ND 2500 " <br /> Surrogate DibromoJluoromethane 114% 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 93% 74-135 " <br /> Surrogate Toluene-d8 104% 84-119 <br /> Surrogate 4-BromoJluorobenzene 102% 86-119 " <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated,results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 5 of 11 <br />