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CHROMALAB, INC. <br /> Environmental Services(SDB) <br /> June 3 , 1998 Submission #: 9805267 <br /> ERM-WEST WALNUT CREEK <br />' Atten • James Ackerman. <br /> Project UP-STOCKTON Project#. 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 WATER <br /> Lab Run#: 12843 Instrument. Analyzed: May 19, 1998 <br /> Spiked <br /> Sample Spike Amt Amt Found Spike Recov % <br /> Amount MS MSD MS MSD MS MSD Control % RPD <br /> Anal to u L u L (ug/L $ Limits RPD Lim <br /> METHYL TERTIARY N.D 50 0 50 . 0 65 4 63 .4 131 127 65-135 3 10 20 <br /> BUTYL ETHER (MTBE) <br /> Sample e <br /> p Spiked- 185781 <br />' Submission #: 9805220 <br /> Client Sample ID PMW151398 <br /> I <br /> MS Smpl # 186706 <br /> MSD Smpl # 186707 1220 QuarryLane • Pleasanton, California 94566-4756 <br /> aCMSPK1229 MAXWftGARV 03 Jun <br /> (925) 484-1919 • Facsimile (925) 484-1096 <br /> Federal 10 #68-0140157 <br />