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CM <br /> a_ _� (Sequoia 1455 McDowell Blvd,North Ste <br /> 707) <br /> Petaluma,CA 949544Analytical 792-1865 <br /> JW FAX(707)792-0342 <br /> www sequoialabs co10 <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P309112 <br /> 3017 Ktlgare 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-5(P309112-01)Water Sampled 09/05/03 12 17 Received 09/05/03 14 10 <br /> Tert-amyl methyl ether ND 200 ug/i 200 3090336 09/16/03 09/16/03 EPA 8260B <br /> Benzene ND 100 <br /> Tert-butyl alcohol ND 4000 <br /> Di-isopropyl ether ND 200 <br /> 1,2-Drbromoethane(EDB) ND 100 <br /> 1,2-Dichloroethane ND 100 <br /> Ethanol ND 20000 <br /> Ethylbenzene ND 100 <br /> Ethyl tert-butyl ether ND 200 <br /> Methyl tert-butyl ether 5900 100 <br /> Toluene ND 100 <br /> Xylenes(total) ND 100 <br /> Surrogate Dibromofluoromethane 106% 84-122 " <br /> Surrogate 1 2-Dichloroethane-d4 90% 74-135 <br /> Surrogate Toluene-d8 100% 84-119 <br /> Surrogate 4-Bromofluorobenzene 101 % 86-119 <br /> EW4(P309112-02)Water Sampled 09/05/03 03 02 Received 09/05/03 14 10 <br /> Tert-amyl methyl ether ND 5000 ugll 5000 3090336 09/16/03 09/16/03 EPA 8260E <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-Drchloroethane ND 2500 <br /> Ethanol ND 500000 <br /> Ethylbenzene ND 2500 <br /> Ethyl tert-butyl ether ND 5000 <br /> Methyl tert-butyl ether 100000 2500 <br /> Toluene ND 2500 <br /> Xylenes(total) ND 2500 <br /> Surrogate DtbromoJluoromethane 107% 84-111 <br /> Surrogate 1 2-Drchloroethane-d4 95% 74-135 <br /> Surrogate Toluene-d8 102% 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 <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 0 <br /> Page 4 of 11 <br />