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680 Chesapeake Drive Redw)-ad City,CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N.Wiget 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)921-0100 <br /> Analytical ',551 McDowelltialR ad d.North,Ste. D Petaluma, CAA94954 (707)94070-4111 (650)232-9600 FAX(6865 FAX 00) 232-9642 <br /> SECOR International Project: ARCO 4493, Stockton,CA Sampled: 2/10/99 to 2/12/99 <br /> 9912 Business Park Drive,Ste. 100 Project plumber: NIA Received: 314/99 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 3/10/99 <br /> Volatile Organic Compounds by EPA Method 8260A/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RAD <br /> Analyte Analyzed Level Result Result Units Recov. Limits % Limit % Notes* <br /> Batch: 9020258 Date Prepared: 2/22/99 Extraction Method: EPA 503013 1h1c0 1 <br /> ;BJsan 902025$;BLK1 <br /> Chlorobenzene 2/22/99 ND ug/kg 100 <br /> Chloroethane ND 500 <br /> Chloroform ND 100 <br /> Chloromethane ND 500 <br /> 2-Chlorotoluene ND 100 <br /> 4-Chlorotoluene ND 100 <br /> Dibromochloromethane 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 /> Dichlorobenzene ND 100 <br /> lorodifluoromethane ND Soo <br /> l-Dichloroethane ND 100 <br /> 1,2-Dichloroethane ND 100 <br /> 1,1-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 /> I,1-Dichloropropene ND 100 <br /> Ethylbenzene ND 100 <br /> Hexachlorobutadiene ND 100 <br /> Isopropylbenzene ND 100 <br /> p-Isopropyltoluene ND 100 <br /> Methylene chloride ND 500 <br /> Naphthalene ND 500 <br /> n-Propylbenzene ND 100 <br /> Styrene ND 100 <br /> 1,1,1,2-Tetrachloroethane ND 100 <br /> 1,1,2,2-Tetrachloroethane ND 100 <br /> Tetrachloroethene ND 100 <br /> Toluene ND 100 <br /> 1,2,3-Trichlorobenzene ND 100 <br /> 1,2,4-Trichlorobenzene ND 100 <br /> 1,1,1-Trichloroethane ND 100 <br /> I,1,2-Trichloroethane ND 100 <br /> chloroethene ND 100 <br /> quota Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Sandra R. Hanson,Client Services Representative Page 26 of 29 <br />