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Sequoia <br /> 680 Chesapeake Drive Redwcxl City,CA 94063 (650)364-9600 FAX(650)364-9Z33 <br /> Se <br /> 1 uoia 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)921-0 100 <br /> Analytical 1455 McDowell Blvd, North.Ste, D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 15-91 Industrial Road San Carlos,CA 94070-4111 (650)232-9600 FAX(650}232-9612 <br /> SECOR International Project: ARCO 4493,Stockton,CA Sampled: 2/24/99 to 2/25/99 <br /> 9912 Business Park Drive,Ste. 100 Project Number: N/A Received: 2126/99 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 315/99 <br /> Volatile Organic Compounds by EPA Method 8010B/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 /> Matrix Spike 9030070-MSI 5902285-08 <br /> Chlorobenzene 312/99 400 ND 492 ug/kg 60.0-140 123 <br /> I,l-Dichloroethane 200 ND 248 60.0-140 124 <br /> Trichloroethene 200 ND 244 60.0-140 122 <br /> Surrogate: Bromochloromethane 200 268 60.0-140 134 <br /> Surrogate: 2-Chlorotoluene 200 232 60.0-140 116 <br /> MgtrixSpike Dun 9030070-MSD1 5902285-08 <br /> Chlorobenzene 3/2/99 400 ND 530 ug/kg 60.0-140 133 25.0 7.81 <br /> 1,1-Dichloroethane 200 ND 210 60.0-140 105 25.0 16.6 <br /> Trichloroethene 200 ND 226 60.0-140 113 25.0 7.66 <br /> Surrogate: Bromochloromethane 200 240 60.0-140 120 <br /> Surrogate: 2-Chlorotoluene 200 248 60.0-140 124 <br /> Sequoia Analytical-�Sacramento TT *Refer to end of report for text of notes and definitions. <br /> Sandra R. Hanson,Client Services Representative Page 19 of 21 <br />