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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 />Demands <br />Analysis <br />HACH 8000 <br />Chemical oxygen demand (COD) 1' 4 <br />1585 / PEI -026 - Lot 017257 <br />/Analyst jba/ Analysis Date: 512/11 <br />Low Level Analytes <br />Analysis <br />EPA 245.7 (1999) <br />Mercury, Hg 1'4 <br />1095/ PEI-240 - Lot 019034 <br />/Analyst: rdwl Analysis Date: 4/20/11 <br />Trace Metals - Waste Water <br />Analysis <br />EPA 200.7 <br />Thallium, TI 1 ' 4 <br />1165 / PEI- 3034 -2 - Lot 016828/016637 <br />/Analyst: cp/ Analysis Date: 5113/11 <br />Analysis <br />EPA 6020 (1994) <br />Antimony, Sb 1 ' 4 <br />1005 / PEI - 3034 -2 - Lot 016628/016637 <br />/Analyst: sml/ Analysis Date: 4126/11 <br />5/27/11 RT1014 WP11 -2 -75 <br />Result Units Assigned Accept. Window Z Evaluation <br />Value <br />142 mg /L 118 93.6 to 143 2.90 Acceptable <br />Evaluation Criteria - Evaluation Parameter- a:0.9517, b:0.4748, c:0.0471, d:2.4507 <br />Result Units <br />50.8 ng /L 63.2 47.3 to 79.2 - 2.33 Acceptable <br />Evaluation Criteria - 1 Evaluation Parameter a:0.9910, b:D.2064, c:0.0432, d:2.5774 <br />Result Units <br />Result Units <br />Assigned <br />Value <br />Assigned <br />Value <br />Assigned <br />Value <br />ACICREDITEDI <br />Pro6clencyT sling Provider <br />(ntsnuut PROFICIENCY TESTING PROVtOER <br />Accept. Window Z Evaluation <br />Accept. Window Z Evaluation <br />Accept. Window Z Evaluation <br />WP11 -2 -75 <br />Concluded 05/25/2011 <br />Final Report <br />Method Number 60003001 <br />Low Level Analytes <br />Method Number 10038003 <br />Trace Metals - Waste Water Matrix <br />Method Number 10013408 <br />456 pg /L 526 422 to 629 -2.02 Acceptable <br />Evaluation Criteria - 1 Evaluation Parameter- a:1.0109, b: 4.1903, c:0.0495, d:8.6236 <br />Method Number 10156204 <br />681 pg /L 732 543 to 921 -0.81 Acceptable <br />Evaluation Criteria - 1 Evaluation Parameter- a:0.959, b: 3.6479, c:0.0779, d:3.2351 <br />Page 4 of 15 <br />