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Sequoia 680 Chesapeake Drlve Redwood City,CA 94063 (650)364-9600 FAX(650) 364-9233 <br /> 404 N.Wiget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-%73 <br /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)921-0 100 <br /> /� �It1Cal 1455 McDowell Blvd.North,Ste.D Petaluma,CA 94954 (707)792-1865 FAX(707) 792-0342 <br /> �j� 1551 Industrial Road San Carios, CA 94070-4111 (650)232 9600 FAX(650) 232-9612 <br /> SECOR International Project: ARCO 4493, Stockton,CA Sampled: 4/13/99 <br /> 9912 Business Park Drive,Ste. 100 Project Number: N/A Received: 4/14199 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 4/19/99 <br /> Conventional Chemistry Parameters by APHA/EPA Methods/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 % Not <br /> Batch: 9040183 Date Prepared: 4/17/99 Extraction Method: Gellergl fteparation <br /> Blank 90401 B3-BLK1 <br /> TRPH 4/18199 ND mg/kg 50.0 <br /> lis 9040183-BSI <br /> TRPH 4/18/99 S00 450 mg/kg 70.0-130 90.0 <br /> Matrix Spike 9040183-MSI S904203-03 <br /> TRPH 4/18/99 S00 247 635 mg/kg 60.0-140 77.6 <br /> Matrix Spike Duo 9040183-MSD1 S904203-03 <br /> TRPH 4/18/99 500 247 530 mg/kg 60.0-140 56.6 30.0 31.3 4,5 <br /> -'Sequoia Analytical-Sacramento \ *Refer to end of report for text of notes and definitions. <br /> Sandra R. Hanson,Client Services Representative Page I I of 12 <br />