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CHEMWEST ANALYTICAL LABORATORIES <br /> TOTAL CHROMIUM <br /> Date (s) Analyzed: 01/25/91 Case 7443 <br /> Matrix: Water <br /> Amount <br /> Client CHEMWEST Detected <br /> ID ID (mg/L) <br /> ------------------------------------------------------------------ <br /> 68715 7443-1 BRL <br /> 68716 7443-2 640 * <br /> 68717 7443-3 910 <br /> 68718 7443-4 3600 * <br /> 68719 7443-5 1700 <br /> 68720 7443-6 1100 <br /> 68721 7443-7 77 * <br /> 68722 7443-8 0. 05 <br /> 68723 7443-9 BRL <br /> 68724 7443-10 BRL <br /> 68725 7443-11 BRL <br /> 68726 7443-12 BRL <br /> 68727 7443-13 BRL <br /> 68715DUP 7443-1D BRL <br /> ------------------------------------------------------------------ <br /> Spike <br /> Client CHEMWEST Conc. <br /> ID ID (mg/L) Rec. <br /> ------------------------------------------------------------------- <br /> 68716 MS 7443-2MS 2 . 5 115% <br /> 68716 MSD 7443-2MSD 2 . 5 93% <br /> ------------------------------------------------------------------- <br /> Relative Percent Difference = 21% <br /> Spike Amount <br /> Client CHEMWEST Conc. % Detected <br /> ID ID (mg/L) Rec. (mg/L) <br /> -------------------------------------------------------------------- <br /> Method Blank MB BRL <br /> MBS MBS 5. 0 107% <br /> MBSD MBSD 5. 0 104% <br /> -------------------------------------------------------------------- <br /> Relative Percent Difference = 3% <br /> The reporting limit for Total Chromium is 0. 02 mg/L. <br /> BRL: Below Reporting Limit. <br /> * : See case narrative <br /> Date Reported: <br /> Approved by: 02/06/91 REV3 : 1. 90 <br /> COMPUCHEM WESTERN DMSION <br />