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4D 1A55 McDowell Blvd,North Ste D <br /> Sequoia P Petal <br /> 4D (707)792 1865 <br /> iW Analytical PAX(707)792 0342 <br /> www seRuoialabs cam <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P406416 <br /> 3017 Kilgare Road Suite 100 Project Number WR 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 07/14/04 16 40 <br /> DRAFT: Purgeables by EPA Method 624 - Quality Control <br /> Sequoia Analytical- Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit U41tS Level Result %REC Limits RPD Limit Notes <br /> Batch 4070008-EPA 50308 waters <br /> Blank(4070008-BLKI) Prepared&Analyzed 07/01/04 <br /> Benzene ND 10 ug/l - <br /> Bromodichloromethane ND 10 " <br /> Bromoform ND 10 " <br /> Bromomethane ND l0 " <br /> Carbon terrachlonde ND to " <br /> Chlorobenzene ND 10 " <br /> Chloroethane ND 10 " <br /> 2 Chloroethylvinyl ether ND to " <br /> Chloroform ND 10 " <br /> Chloromethane ND 10 " <br /> Dibromochloromethane ND 10 " <br /> 1,2-Dichlorobenzene ND to <br /> 1,3-Dichlorobenzene ND 10 " <br /> 1,4 Dichlorobenzene ND 1 0 " <br /> 1,1 Dichloroethane ND 10 " <br /> 1,2 Dichloroethane ND 10 " <br /> l,l-Dichloroethene ND 10 " <br /> cis-1,2-Dichloroethene ND 10 " <br /> trans-1,2-Dichlotoethene ND 10 " <br /> 1,2-Dichloropropane ND 10 " <br /> cis-1,3-Dichloropropene ND 10 " <br /> trans-l,3-Dichloropropene ND 10 " <br /> Ethylbenzene ND 10 " <br /> Methylene chloride ND 10 " <br /> Methyl tent-butyl ether ND 1 0 " <br /> 1,1,2,2 Tetrachloroethane ND 10 " <br /> Tetrachloroethene ND 10 " <br /> Toluene ND 10 " <br /> 1,12 Tnchloroethane HID 1 0 " <br /> 1,1,1 Tnchloroethane ND 1 0 " <br /> Trichloroethene ND 10 " <br /> Tnchlorofluoromethane ND to " <br /> Vinyl chloride ND 10 " <br /> Xylenes(total) ND 10 " <br /> Surrogate Dtbromofluoromethane 550 " 500 110 84-122 <br /> DRAFT REPORT 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 /> 0 This analytical report must be reproduced in its entirety <br /> Page 11 of 20 <br />