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CHRQMALAB, INC. <br /> Environmental Services(SDB) <br />' April 2 , 1998 Submission # 9803455 <br />' HARDING LAWSON (SACRAMENTO) <br /> Atten: Gary Haeck <br />' Project 38737 004 <br /> Received March 30 , 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# 11951 Analyzed: April 1, 1998 <br />' Sp3.ke <br /> Spike Amount Amount Found Spike Recov <br /> BSP Dup BSP Dup BSP Dup Control % RPD <br /> Analyte (uq L) (ug/L) M M Limats RPD Lim <br />' METHYL 'TERT IARY BUTYL ETHE 50 0 50 . 0 51 .4 47 2 103 94 3 80-120 8 82 20 <br /> t <br /> BS SW #! 178472 1220 Quarry Lane• Pleasanton, California 94566-4756 <br /> BSD 5mpl # 17$473 (510) 484-1919• Facsimile (510) 484-1096 oC BSDM6 YT 11 VL71 <br /> Federal ID#68-0140157 <br />