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CHEMWEST ANALYTICAL LABORATORIES <br /> ARSENIC <br /> Date (s) Analyzed : 04/21/91 Case 7937 <br /> Matrix: Water <br /> Amount <br /> Client CHEMWEST Detected <br /> ID ID (mg/L) <br /> ------------------------------------------------------------------ <br /> 66217 7937-1 BRL <br /> 66218 7937-2 3. 6 <br /> 66219 7937-3 0.75 <br /> 66220 7937-4 22 <br /> 66221 7937-5 BRL <br /> 66222 7937-6 BRL <br /> 66223 7937-7 BRL <br /> 66224 7937-8 BRL <br /> 66225 7937-9 BRL <br /> 66226 7937-10 0.03 <br /> 66227 7937-11 BRL <br /> 66228 7937-12 BRL <br /> ------------------------------------------------------------------ <br /> Spike Amount <br /> Client CHEMWEST Conc. 8 Detected <br /> ID ID (mg/L) Rec. (mg/L) <br /> ------------------------------------------------------------------ <br /> Method Blank MB BRL <br /> MBS MBS 0.04 92% <br /> MBSD MBSD 0. 04 94% <br /> ------------------------------------------------------------------ <br /> Relative % Difference = 28 <br /> The reporting limit for Arsenic is 0. 01 mg/L . <br /> BRL: Below Reporting Limit. <br /> Date Reported: <br /> Approved by: 04/24/91 REV3:1.90 <br /> t <br /> COMPUCHEM WESTERN DIVISION <br />