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SIGMA AL©RICH' <br />Accrediting Labcode WY00002 <br />Wyoming DEQ <br />Water Quality Division <br />478 Edward Mock <br />122 W. 25th Street <br />Cheyenne WY 82002 <br />UNITED STATES <br />RTC is accredited to perform PT programs for the scope of accreditation to ISO /IEC 17043 under ACLASS cerficate AP -1469. <br />RTC is accredited by A2LA to perform PT programs for the scope of accreditation to ISO /IEC <br />17043 under A2LA certificate 2122.01. <br />This report may contain data that are not covered by the A2LA accreditation. Refer to <br />the footnote for each analyte regarding specific accreditaiton <br />Low Level Analytes <br />Analysis <br />SM 3112 B 21st ED (2005) <br />Mercury, Hg 1 4 <br />1095 / PEI -240 - Lot 019034 <br />/Analyst: rdwl Analysis Date: 4/21/11 <br />Trace Metals - Waste Water <br />Analysis <br />EPA 6010B (1996) <br />Thallium, TI i, 4 <br />1165 / PEI - 3034 -2 - Lot 016628/018837 <br />/Analyst: cp/ Analysis Date: 5/13/11 <br />Volatiles <br />Analysis <br />EPA 8260B (1996) <br />Acetonitrile 4 <br />43201 PEO- 120 -35 - Lot 017018 <br />/Analyst; jlr /Analysis Date: 5/11/11 <br />5/27/11 RT1014 WP11 -2 -75 <br />Result Units <br />Assigned <br />Value <br />51 ng /L 63 47.3 to 79.2 -2.29 Acceptable <br />Evaluation Criteria - 1 Evaluation Parameter- a:0.9910, b:0.2064, c:0.0432, d:2.5774 <br />Result Units <br />Result Units <br />End of WP11 -2 -75 Set2 <br />Assigned <br />Value <br />ACCREDITED <br />P eful.ncy Tsung Provider <br />Cen. 717701 <br />Accept Wndow Z Evaluation <br />Accept. Window Z Evaluation <br />Trace Metals - Waste Water Matrix <br />462 pg /L 526 422 to 629 -1.85 Acceptable <br />Evaluation Criteria - 1 Evaluation Parameter a:1.0109, b:- 4.1903, c:0.0495, d:8.6236 <br />Assigned <br />Value <br />Accept. Window Z Evaluation <br /><10 pg /L 99.0 0.00 to 203 Acceptable <br />Evaluation Criteria - 1 Evaluation Parameter - a:1, b:0, c:0.35, d:0 <br />WP11 -2 -75 <br />Concluded 05/25/2011 <br />Final Report <br />PROFICIENCY TESTING PROVIDER <br />Low Level Analytes <br />Method Number 20057801 <br />Method Number 10155609 <br />Volatiles <br />Method Number 10184802 , <br />Page 8 of 15 <br />