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� <br /> Sequoia 8f9 5troker Avenue'Suite 8 <br /> Sacramento Ck5834(916)921-960o <br /> ' <br /> Analytical - -- _ - FAX(916)921-0 100 <br /> SFCOR International Project ARCO 434,Lodi,CA Sampled 6118/99 <br /> 9912 Business Park Drive, Ste 100 Project Number N/A Received 7/8/99 <br /> Sacramento,CA 95827_ - _ - - Project Manager Rusty Benkosky—__ - --- - -=Reported--7/19/99-T - <br /> Volatile Oxygenate Compounds by EPA Method 8260A/Quahty_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. 90 ,0151 Date Prepared, 7113199 Extraction Method. EPA,5030B [MeOHI <br /> Blank 9070151-BLK1 <br /> Tert-butyl alcohol 7/13/99 ND mg/kg 100 <br /> Methyl tert-butyl ether ND 0 100 <br /> Di-isopropyl ether ND 0 100 <br /> Ethyl tert-butyl ether ND 0 100 <br /> Tert-amyl methyl ether ND 0 104 <br /> 1,2-D ich loroethane ND 0 100 <br /> Surrogate 12-DCA-d4 250 274 600-140 110 <br /> LAS 9070151-BS1 <br /> Methyl tert-butyl ether 7/13/99 2 50 266 mg/kg 700-130 106 <br /> Surrogate 1 2-DCA-d4 " 250 278 600-140 111 <br /> Matrix splle 9070151-MS] S907042-13 <br /> Methyl tert-butyl ether 7/13/99 250 ND 239 mg/kg 600-140 956 <br /> Surrogate 1 2-DCA-d4 11250 250 600-140 100 <br /> Matrix Spike nun 9070151-MSD1 5907042-13 <br /> Methyl tert-butyl ether 7/13/99 250 ND 233 mg/kg 600-140 932 250 254 <br /> Surrogate 1 2-DCA-d4 250 248 10600-140 992 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and defnrtrons <br /> Page 7 of 8 <br />