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CHEMWEST ANALYTICAL LABORATORIES <br /> Hexavalent Chromium <br /> Date ( s) Analyzed: 04-25-90 Case 5886 <br /> thru : 05-11-90 Matrix : Water <br /> Amount <br /> Client CHEMWEST Detected <br /> ID ID (mg/L) <br /> ------------------------------------------------------------------ <br /> 38899 5886-1 670 <br /> 38900 5886-2 490 <br /> 38901 5886-3 6100 <br /> 38902 5886-4 2100 <br /> 38903 5886-5 970 <br /> 38904 5886-6 43 <br /> 38905 5886-7 BRL <br /> 38906 5886-8 BRL <br /> 38907 5886-9 BRL <br /> ------------------------------------------------------------------ <br /> The reporting limit for Hexavalent Chromium is 0. 05 mg/l. <br /> Spike Amount <br /> Client CHEMWEST Conc. 8 Detected <br /> ID ID (mg/L) Rec . (mg/L) <br /> ------------------------------------------------------------------ <br /> 388906 5886-8DUP BRL <br /> 388906 5886-8MS 0 . 20 1028 <br /> 388906 5886-SMSD 0 . 20 1008 <br /> Method Blank 5886-MB BRL <br /> Method Blank Spike 5886-MBS 0 . 20 99% <br /> Method Blk Dup 5886-MBSD 0 . 20 98% <br /> ---------------------------------------------------------------- <br /> Relative % Difference for MS/MSD = 2% <br /> Relative % Difference for MBS/MBSD = 1% <br /> Approved by: REv4 : 1 .90 <br /> CHEMWEST ANALYTICAL LABORATORIES.INC <br />