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Sequoia 819 Striker Avenue,Suite 8 <br /> Sacramento, CA 95834 <br /> Analytical FAX(916)9x1-0100 <br /> SECOR International Project: ARCO 4493,Stockton,CA Sampled: 6117/99 <br /> 9912 Business Park Drive,Ste. 100 Project Number: 7G600-604-02 Received: 6/17/99 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 7/6/99 <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 % Motes* <br /> Matrix Spoke Dup 9Q60372-MSD1 S906385-01 <br /> Methyl tert-butyl ether 6/24/99 50.0 2.18 62.6 ug/I 60.0-140 121 25.0 2.51 <br /> Surrogate: 1,2-DCA-d4 50.0 51.6 " 60.0-140 103 <br /> Sequoia Analytical -Sacramento *Refer to end of report for text of notes and definitions. <br /> Page 20 of 21 <br />