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Sequoia `' <br /> 819 Striker Avenue,Sbite 8 <br /> Sacramento, CA 95834 <br /> (916)921-9600 <br /> TOW Analytical FAX(916)92I-o 100 <br /> SECOR International Project: ARCO 434,Lodi,CA Sampled: 6/16/99 <br /> 9912 Business Park Drive,Ste. 100 Project Number: N/A Received: 6/18/99 <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 % Notes* <br /> Batch: 9060373 Date Prepared: 6/24/99 Extraction Method: EPA 50308(MeOH1 <br /> Blank 9060373-BLKI <br /> Tert-butyl alcohol 6/25/99 ND mg/kg 10.0 <br /> Methyl Cert-butyl ether ND 0.100 <br /> Di-isopropyl ether ND 0.100 <br /> Ethyl tert-butyl ether ND 0.100 <br /> Teri-amyl methyl ether ND 0.100 <br /> 1,2-Dichloroethane ND 0.100 <br /> Surrogate: 1,2-DCA-d4 2.50 2.45 60.0-140 98.0 <br /> LCS 9060373-BSI <br /> Methyl tert-butyl ether 6/25/99 2.50 2.48 mg/kg 70.0-130 99.2 <br /> Surrogate: 1,1-DCA-d4 " 2.50 2.43 60.0-/40 97.2 <br /> Matrix 9060373-MSI 5906238-02 <br /> Methyl tert-butyl ether 6/25/99 2.50 1.45 3.78 mg/kg 60.0-140 93.2 <br /> Surrogate. 1,2-DCA-d4 " 2.50 2.25 60.0-140 90.0 <br /> Matrix Spike nup 9060 73-MSDI 5906238-02 <br /> Methyl tert-butyl ether 6/25/99 2.50 1.45 3.88 mg/kg 60.0-140 97.2 25.0 4.20 <br /> Surrogate. 1.2-DCA-d4 2.50 2.22 60.0-/40 88.8 <br /> Sequoia Analytical-Sacramento 'Refer to end ofreport for text of notes and definitions. <br /> Page 7 of 8 <br /> fid' <br />