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CHROMALAB, INC. <br /> EnWronmental Services(SDB) <br /> June 3 , 1998 Submission # 9805267 <br /> ERM-WEST WALNUT CREEK <br /> ' Atten. James Ackerman. <br /> Pro]ect. UP-STOCKTON Pro_7ect#: 8187 . 25 <br /> Received: May 18, 1998 <br /> re: Matrix spike report for Fuel Oxygenates by GC/MS analysis <br />' Method EPA SW846 Method 8260 Modified <br />' Matrix SOIL <br /> Lab Run# 12856 Instrument: Analyzed • <br /> Spa.ked <br />' Sample Spike Amt Amt Fouad Spike Recov % <br /> Amount MS MSD MS MSD MS MSD Control $ RPD <br /> Analyte u K u K u K % $ Limits RPD Lim <br />' METHYL TERTIARY N D. 97 . 1 111 114 -- 65-135 N/A 20 <br /> BUTYL ETHER (MTBE) <br /> Batch precision measured by LCS/LCSD. <br /> Sample Spiked: 186384 <br /> Submission #• 9805267 <br />' Client Sample ID: B-6-36 ' <br /> 1 <br /> MS SmRE # 186930 <br /> MSD Smpl # 186931 1220 Quarry Lane • Pleasanton, California 94566-4756 QGMSPK 1229 MAXWINIGARY 03 Jun <br /> (925) 484-1919 • Facsimile (925) 484-1096 <br /> Federal !D#68-0140157 <br />