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CHEMWEST ANALYTICAL LABORATORIES <br /> HEXAVALENT CHROMIUM <br /> Date(s) Analyzed: 10/18/90 Case 6934 <br /> Matrix: Waste Water <br /> Amount <br /> Client CHEMWEST Detected <br /> ID ID (mg/L) <br /> ------------------------------------------------------------------ <br /> 62751 6934-1 750 <br /> 62752 6934-2 930 <br /> 62753 6934-3 4700 <br /> 62754 6934-4 2000 <br /> 62755 6934-5 1100 <br /> 62756 6934-6 51 <br /> 62757 6934-7 BRL <br /> 62758 6934-8 BRL <br /> 62759 6934-9 BRL <br /> 62760 6934-10 BRL <br /> 62761 6934-11 BRL <br /> ------------------------------------------------------------------ <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 0.2 108% <br /> MBSD MBSD 0. 2 107% <br /> ------------------------------------------------------------------ <br /> Relative % Difference = 1% <br /> The reporting limit for Hexavalent Chromium is 0. 05 mg/L. <br /> BRL: Below Reporting Limit. <br /> / Date Reported: <br /> Approved by: 11 4}'I 10/31/90 REV3 : 1. 90 <br /> COMPUCHEM 1NESTEPN DIVISION <br />