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Method 203

Method 203. Quality Assurance/Quality Control Requirements for Continuous Opacity Monitoring Systems (COMS). Background/History. Proposed in October, 1992 Addition to 40 CFR Part 51, Appendix M Specified quality assurance requirements/procedures

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Method 203

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  1. Method 203 Quality Assurance/Quality Control Requirements for Continuous Opacity Monitoring Systems (COMS)

  2. Background/History • Proposed in October, 1992 • Addition to 40 CFR Part 51, Appendix M • Specified quality assurance requirements/procedures • After initial demonstration of compliance with PS-1

  3. Background/History, cont’d • Minimum quality control (QC) and quality assurance (QA) • Assess and assure the quality of COMS performance

  4. Requirements • Daily checks • Zero and span (upscale)

  5. Requirements, cont’d • Quarterly performance checks • Optical alignment • Optical surface dust accumulation • Zero and upscale response • Zero compensation • Stack exit correlation error • Calibration error

  6. Requirements, cont’d • Annual checks • Zero alignment

  7. Monitor Acceptance Criteria • Out-of-control periods • Daily checks • Quarterly performance audits • Annual checks • Data capture • 95 percent valid data capture

  8. Recent Activities • Reopened comment period • March 2001 • Established Stakeholders Workgroup • Monthly conference calls • Re-write and re-propose Method 203

  9. Revised Method 203 • Requirements • Eliminate optical surface dust accumulation, stack exit correlation error, zero and upscale response • Optical alignment • Checked when stack temperature is +/- 20 percent of typical operating temperature • Zero alignment • Required to be done off stack every 3 years

  10. Revised Method 203, cont’d • Monitor acceptance criteria • Out-of-control periods (Calibration Drift) • The beginning of the period corresponds to the completion of the daily calibration drift check • Out-of-control periods (Quarterly Performance Audits and Annual Checks) • No change

  11. Revised Method 203, cont’d • Data Capture • 95 percent of the source’s operating hours per quarter • Allow the use of substitute monitors • Previously certified to meet PS-1 • Perform calibration error check • Check calibration drift on a daily basis

  12. Revised Method 203, cont’d • Corrective action procedures • Describes corrective action required to return an opacity monitor to normal operation • Specifies four classes of maintenance and repair procedures • Routine/preventative maintenance • Measurement non-critical repairs • Measurement critical repairs • Rebuilt or refurbished analyzers

  13. Current Schedule • Re-proposal package published in the Federal Register – December 2002 • Promulgation package published in the Federal Register – December 2003

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