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CHROMALAB, INC. <br /> Environmental Services(SDB) <br /> May 22 , 1998 Submission #: 9805267 <br /> ERM-WEST WALNUT CREEK <br /> Atten James Ackerman. <br />' Proaect: UP-STOCKTON Project#: 8187 . 25 <br /> Received. May 18 , 1998 <br />' re: Blank spike and duplicate report for Fuel Oxygenates by GC/MS analysis <br /> Method: EPA SW846 Method 8260 Modified <br />' Matrix: WATER <br /> Lab Run# - 12843 Analyzed: May 19 , 1998 <br />' Spike <br /> Spike Amount Amount Found Spike Recov $ <br /> BSP Dup BSP Dup BSP Dup Control % RPD <br /> Anal to (ug/L u L $ $ Limits RPD Lim <br />' METHYL TERTIARY BUTYL ETHE 50 0 50 . 0 51 7 57 . 2 10 3 114 80-120 10 1 20 <br /> 1 <br /> I <br /> I <br /> B5 SmpL # 186704 <br /> BSD Smpl # 186705 1220 Quarry Lane - Pleasanton, California 94566-4756 a eeo,ns V7110732 <br /> (925) 484-1919 • Facsimile (925) 484-1096 <br /> Federal ID #68-0140157 <br />