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680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364-9233 <br /> DSequoia 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)92 1-0 100 <br /> 455 cDowe <br /> Blvd <br /> 865 FAX(707)79Z-0342 <br /> Analytical 1551 Induustriall1Road North Ste D Sana <br /> PetCarlos CAma CA994070-411 1 (650)232-4954 (707) 79Z 9600 FAX(650)232 9612 <br /> SECOR lntemational Project ARCO 2133, Stockton,CA Sampled 3/15/99 <br /> 9912 Business Park Drive,Ste 100 Project Number 7G600-079-04 Received 3/16199 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 4/1/99 <br /> Volatile Oxygenate 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 Spike-Dilll(Sontin rued) 9030385-MSDI S903219-17 <br /> Surrogate 1 2-DCA-d4 3/26/99 300 220 mg/kg 600-140 733 <br /> 0 <br /> gplruoia Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> Sandra R Hanson Client Services Representative Page 21 of 22 <br />