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the quarterly LOQv, if the concentration is appropriate for both uses. 6.6.6 The quarterly LOQv shall be evaluated at the time of testing, and meet the qualitative identification of the method, and the quantitated result shall be above the MDL. 6.6.7 Corrective action if the LOQv does not meet the requirement may include 1) correcting the method or instrument performance and repeating the test. 2) evaluating laboratory control limits 3) raising the spike level, and quantitation level, as needed, and repeating the LOQv within 30 days. Any samples with a failing LOQv shall be reanalyzed or qualified. 6.7) Documentation 6.7.1 The analytical method used must be specifically identified by number or title and the MDL for each analyte expressed in the appropriate method reporting units. 6.7.2 The sample matrix used to determine the MDL must also be identified with MDL values. Document the mean spiked and recovered analyte levels with the MDL. 6.7.3 The rationale for removal of outlier results, if any, must be documented and maintained with the results of the MDL determination. 6.7.4 Data and calculations used to establish the MDL must be able to be reconstructed upon request. 6.8) Summed Analytes 6.8.1 Summed analytes (such as Total Xylene) may either use the lowest MDL and LOQ, the highest MDL and LOQ, or the MDL and LOQ determined from the combined study for reporting purposes. 6.8.2 Where ever possible, the summed analyte should be treated as a separate analyte, and determine the MDL and LOQ values as appropriate from the summation of the components in the analytical data. 6.8.3 If the MDL and LOQ are determined from the individual components, the laboratory and the data user should be aware of the potential biases. The choice of which procedure is chosen should be documented. • Using the lowest MDL and LOQ from the components assures that low level detections of the component with the lowest MDL/LOQ will be reported if detected. However, non-detects may misrepresent the level at which the least sensitive component is not present. • Using the highest MDL and LOQ from the components assures that reporting ND is appropriate at the higher limit. However, the more sensitive components may be present at a lower concentration, and would not be reported. 7) Responsibilities "IPM • Laboratory Director, Business Unit Manager and Technical Directors - Ensure that adequate resources are made available to complete MDL studies and verifications in a timely manner and at the appropriate frequency, and by the procedure required by regulatory agencies, programs and clients. If client or program requirements can not be accommodated by the laboratory, an approved variance must be received. • Analytical Groups - Perform the MDL studies, review the data for acceptability, and submit completed study reports to the QA group. • Laboratory Quality Group - Review completed MDL studies, update LIMS, as necessary, maintain records of these studies in a format that can be provided to clients and auditors readily on request, and provide metrics of the status of detection limits to senior management. The QA group or designee is responsible for coordinating the annual MDL re-evaluations. 8) Reference r • Definition and Procedure for the Determination of the Method Detection Limit, Revision 2, December 2016, EPA, as published in Title 40 Code of Federal Regulations Part 136 (40 CFR 136, Appendix 6, Revision 2), "Definition and Procedure for the Determination of the Method Detection Limit", August 2017 • TNI Standard, 2009, 2016, Module 4, Quality Systems for Chemical Testing • U.S. Department of Defense (DoD)/Department of Energy (DOE) Consolidated Quality Systems Manual (QSM) for Environmental Laboratories, Version 5.3, May 2019. 9) Appendices