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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N.W1get Lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)921-0 100 <br /> Analytical 1455 McDowell Blvd. North,Ste. D Petaluma,CA 94954 (707)792-1865 FAX(707) 792-0342 <br /> 1551 Industrial Road San Carlos,CA 94070-411 1 (650)232-9600 FAX(650)232-9612 <br /> SECOR International Project: ARCO 4493,Stockton,CA Sampled: 4/13199 <br /> 9912 Business Park Drive, Ste. 100 Project Number: NIA Received: 4/14/99 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 4128199 <br /> Volatile Organic Compounds by EPA Method 8260A/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov. Limits % Limit % Notes* <br /> Batch: 9040173 Date Prepared: 4/15/99/15/99 <br /> Bek 4040173-BLK1 <br /> Benzene 4/15/99 <br /> ND ug/kg 100 <br /> Bromobenzene ND 100 <br /> Bromochloromethane ND 100 <br /> Bromodichloromethane ND 100 <br /> Bromoform ND 100 <br /> Bromomethane ND 500 <br /> n-Butylbenzene ND 100 <br /> sec-Butylbenzene ND 100 <br /> tert-B utyl benzene ND 100 <br /> Carbon tetrachloride ND 100 <br /> Chlorobenzene " ND " 100 <br /> Chloroethane ND 500 <br /> 0lorofomz ND 100 <br /> oromethane ND 500 <br /> -Chlorotoluene ND 100 <br /> 4-Chlorotoluene " ND " 100 <br /> Di bromoch foro methane ND 100 <br /> 1,2-Dibromoethane ND 100 <br /> Dibromomethane ND 100 <br /> 1,2-Dibromo-3-chloropropane ND 500 <br /> 1,2-Dichlorobenzene ND " 100 <br /> 1,3-Dichlorobenzene ND 100 <br /> 1,4-Dichlorobenzene ND 100 <br /> Dichlorodifluoromethane ND 500 <br /> 1,1-Dichloroethane ND 100 <br /> 1,2-Dichloroethane " ND " 100 <br /> IJ-Dichloroethene ND 100 <br /> cis-1,2-Dichloroethene ND 100 <br /> trans-1,2-Dichloroethene ND 100 <br /> 1,2-Dichloropropane ND 100 <br /> 1,3-Dichloropropane ND 100 <br /> 2,2-Dichloropropane ND 100 <br /> 1,1-Dichloropropene ND 100 <br /> Ethylbenzene ND 100 <br /> Hexachlorobutadiene ND 100 <br /> isopropylbenzene ND 100 <br /> p-Isopropyltoiuene " ND " 100 <br /> Methylene chloride ND 500 <br /> Naphthalene ND 500 <br /> -Propylbenzene " ND " 100 <br /> uoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Sandra R4ans n,Client Services Representative Page 15 of 19 <br />