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680 Chesapeake Drive Redwood City,CA 94063 (t`50)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N.Wiget Lane Walnut Creek,CA 945% (925)988-9600 FAX(925)988-%73 <br /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd. North,Ste. D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 1551 Industria[Road San Carlos, 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: 4/28/99 <br /> Diesel Hydrocarbons (C10-C24)by DHS LUFT/QuaIity 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 /> Date Prepared: 4116199 Extraction Method: RPA 3550A <br /> Blank 90401 R0-13i.K1 <br /> Extractable Hydrocarbons 4119/99 ND mg/kg 1.00 <br /> Surrogate: Pentacosane It <br /> 0.500 0.498 to 50.0-150 99.6 <br /> IJS 9040180-BSI <br /> Extractable Hydrocarbons 4/19/99 12.5 12.4 mg/kg 60.0-140 992 <br /> Surrogate: Pentacosane 11 0.500 0.560 50.0-150 112 <br /> Matrix spqkc 9040180-MSI 5904168-02 <br /> Extractable Hydrocarbons 4/19199 12.5 3600 ND mg/kg 50.0-150 NR 3,D <br /> Surrogate: Pentacosane 0.500 ND 50.0-150 NR 4,D <br /> Matrix Spike Dun 90401 80-M5121S904168-02 <br /> —Extractable Hydrocarbons 4/19/99 12.5 3600 ND mg/kg 50.0-150 NR 50.0 3,D <br /> rogate: Pentacosane 0.500 ND 50.0-150 NR 4,D <br /> 'RWVquoia Analytical -Sacramento *Refer to end of report for text of notes and definitions. <br /> lam' <br /> Sandra R. Hanson, CGent Services Representative Page 12 of 19 <br />