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1455 McDowell Blvd, North Ste D <br /> Sequoia <br /> Petaluma,CA 94954 <br /> (a— ) 707)792 1865 <br /> W Analytical FAX(707)792 0342 <br /> www sequoia[abs <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P311302 <br /> 3017 ralgare Road Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 12/01/03 15 25 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit units Dilution Batch Prepared Analyzed Method Nates <br /> MID 2(P311302-07)Water Sampled 11/13/03 14 25 Received 11/13/0315 30 <br /> Benzene ND 0 50 ug/1 1 3110489 11/21/03 11/21/03 EPA 8260B <br /> Ethylbenzene ND 0 50 ^ " " " <br /> Methyl tert-butyl ether ND 050 <br /> Toluene ND 0 50 <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 111% 84-112 <br /> Surrogate 1,2-Dichloroethane-d4 117% 74-135 <br /> Surrogate Toluene-d8 119% 84-119 <br /> GW-EFF(P311302-08)Water Sampled 11/13/03 14 20 Received 11/13/03 15 30 <br /> Benzene ND 0 50 ug/1 1 3110489 11/21/03 11/21/03 EPA 8260B <br /> Ethylbenzene ND 0 50 <br /> Methyl tert-butyl ether ND 0 50 <br /> Toluene ND 050 " " " • <br /> Xylenes(total) ND 0 50 " ^ <br /> Surrogate DibromoJluoromethane 113% 84-122 <br /> Surrogate 1,2-Dichloroe1hane-d4 118% 74-135 <br /> Surrogate Toluene-d8 117% 84-119 <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 is <br /> Page 7 of 15 <br />