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SIGMA— AL©RICHe <br />ISO Guide 34. For more information contact RTC. Additionally RTC complies with TNI Volume 3'General Requirements for <br />Environmental Proficiency Test Providers', EL -V3 -2009, 2009 for all TNI Fields of Proficiency Testing analytes. <br />Metrological Traceability - All preparations are made using balances calibrated annually traceable to NIST standards. Where <br />appropriate analytical measurements are traceable through an unbroken chain to NIST standards, or a Certified Reference Material <br />manufactured under ISO Guide 34 in conjunction with ISO /IEC 17025. <br />Statistical Analysis - RTC uses robust statistics to calculate study means and standard deviations - Reference - Kafadar, K, A <br />Biweight Approach to the One - Sample Problem, Journal of the American Statistical Association, Vol. 77, No. 378, June, 1982, pp. <br />416 -424. <br />Additional Information - Go to www.rt- corp.com /reporting for additional information on summary statistics for specific methods, <br />advice on the interpretation of the statistical analysis, and additional comments /recommendations. If you failed an analyte it may be <br />required to perform a corrective action and /or retest. RTC recommends that you contact your accreditation body for specific <br />instruction. <br />Program analyte accrediting footnotes <br />1 NELAC Compliant, covered by RTC's A2LA Provider of Proficiency Testing accreditation, Cert. 2122.01 <br />4 ISO 17043 Accredited, covered by RTC's ACLASS Proficiency Testing Provider accreditation, Cert AP -1469 <br />5 NELAC Experimental <br />Authorizing Officer: <br />Patrick Brumfield, ASQ CQA <br />QA Manager <br />5/27/11 RT1014 WP11 -2 -75 <br />WP11 -2 -75 <br />Concluded 05/25/2011 <br />Final Report <br />Date: 5/27/2011 <br />Page 15 of 15 <br />