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Sequoia 680 Chesapeake Drive Redwood City.CA 94063 (650)364-9600 F4X(650)364-9233 <br /> 404 N.Wiget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(975)988-%73 <br /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)921-0 100 <br /> 455 <br /> 865 FAX(707)79Z-0342 <br /> Analytical 1551 d`uus al Road <br /> .North.Ste. D Swell an ICarlos CA 94070-41 11 (650)232-uma,CA 94954 (707) 9600 FAX(650)232-9612 <br /> 0 <br /> SECOR International Project: ARCO 4493,Stockton,CA Sampled: 4/13/99 <br /> 9912 Business Park Drive,Ste. 100 Project Number: N/A Received: 4/14/99 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 4/28/99 <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 /> Matrix Spi a(continncd) 20411a3--Ha 5904159-02 <br /> Surrogate: 4-BFB 4/15/99 2500 2040 ug/kg 70.0-130 81.6 <br /> atrU Spike Duo - 5904159-02 <br /> Benzene 4/15/99 2500 394 2180 ug/kg 60.0-140 71.4 25.0 0 <br /> Chlorobenzene 2500 ND 2180 60.0-140 87.2 25.0 1.39 <br /> I,I-Dichloroethene 2500 ND 1850 60.0-140 74.0 25.0 1.63 <br /> Toluene 2500 776 2180 60.0-140 56.2 25.0 0 2 <br /> Trichloroethene 2500 ND 1990 60.0-140 79.6 25.0 0.504 <br /> Surrogate: Dibromofluoromethane 2500 2260 70.0-130 90.4 <br /> Surrogate: 1,2-DCA-d4 2500 2230 70.0-130 89.2 <br /> Surrogate: Toluene-d8 2500 2370 70.0-130 94.8 <br /> .Surrogate: 4-BFB 2500 2090 70.0-130 83.6 <br /> uoia Analytical-Sacramento *Refer to end of report far text of notes and definitions. <br /> Sandra R. Hanson,Client Services Representative Jl Page 17 of 19 <br />