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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 />EPA 7470A (1994) <br />Mercury, Hg 1.4 <br />1095 t PEI-240 - Lot 019034 <br />/Analyst: rdw/ Analysis Date: 4/21/11 <br />5/27/11 RT1014 WP11 -2 -75 <br />Result Units <br />51 ng/L 63.2 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 />End of WP11 -2 -75 Set3 <br />Assigned <br />Value <br />ACCREDITED <br />ProadencyT sting Provider <br />Cent2122a1 <br />Accept. Window Z Evaluation <br />WP11 -2 -75 <br />Concluded 05/25/2011 <br />Final Report <br />PROFICIENCY TESTING PROVIDER <br />Low Level Analytes <br />Method Number 10165807 <br />Page 11 of 15 <br />