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Background

Overview/Update of EPA’s Mercury Emissions Monitoring Program Scott Hedges, USEPA, CAMD EPRI CEM Users Group Meeting Phoenix, AZ May 9 - 11, 2007. Background. The Clean Air Mercury Rule (CAMR) requires sources to install and certify mercury monitoring systems by January 1, 2009

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Background

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  1. Overview/Update of EPA’s Mercury Emissions Monitoring ProgramScott Hedges, USEPA, CAMDEPRI CEM Users Group MeetingPhoenix, AZMay 9 - 11, 2007

  2. Background • The Clean Air Mercury Rule (CAMR) requires sources to install and certify mercury monitoring systems by January 1, 2009 • Affected sources have begun ordering monitoring and data acquisition systems • Vendors have expressed a high level of confidence that continuous mercury emission monitoring systems will be available to meet industry needs and CAMR requirements

  3. Background • Development of the CAMR monitoring program has been a collaborative effort between EPA (OAQPS, ORD, CAMD), NIST and industry (EPRI, RMB, WRI, EERC and others) • EPA continues its full commitment to working with utilities, vendors, academia, NIST, and other organizations to successfully develop all aspects of the CAMR mercury monitoring program • Most major technical issues are behind us but some challenges remain

  4. Mercury Monitoring – Next Steps • Promulgate instrumental and sorbent-based mercury reference methods • Develop NIST-traceable calibration gases and protocols • Develop training materials and conduct training for EPA Regions, States and sources • Ordering, installation and certification of monitors by sources • Collect, quality assure, and report data

  5. Availability of Alternative Reference Methods EPA is preparing a rule package for both the instrumental and sorbent-based reference methods • Process being expedited through direct final rule making effort • Final rule tentatively scheduled for early August publication in the Federal Register • Would become final in October if no adverse comments are received

  6. Proposed Monitoring Changes to Part 75 • Proposed Part 75 rule changes published August 22, 2006 • Comment period closed in October 06 • Reference Method 29 proposed as an alternative Ontario Hydro reference method • Minor technical/procedural changes proposed to Subpart I of Part 75 including adding multiple/common stack heat input procedures • Solicited comments relating to the development of reference method based on sorbent trap technology • Received comments were not extensive - essentially supportive of changes • Rule expected to become final late summer

  7. Additional Hg-Related Part 75 Changes being Considered • Possible changes to Subpart B (Monitoring Provisions) and Appendix K being considered for inclusion in the Alternative Reference Method Rule Package • Providing minor clarifications to the Hg monitoring and measurement provisions • Requiring same type of sorbent material used during an Appendix K RATA also be used during daily operation • Allowing smaller sorbent traps to be used during an Appendix K RATA than used during daily operation • will reduce the required sampling time per run • Removing spike recovery normalization correction to sorbent trap monitoring systems • Tightening spike recovery acceptance criteria for sorbent trap monitoring systems • Providing alternatives to dry gas meters in Appendix K (e.g., allowing the use of thermal mass flow meters)

  8. NIST-Traceable Hg Calibration Standards • EPA and NIST continue their collaborative work to provide NIST traceability for elemental and oxidized mercury calibration standards • We are expecting to have NIST-traceability protocol documents this year for use in certifying CEMS and sorbent trap monitoring systems

  9. NIST-Traceable Hg Calibration Standards To date EPA: • Has prepared working draft elemental mercury gas generator traceability protocol • Will be incorporating user-friendly uncertainty calculation spreadsheets into the draft • Working draft has been sent to vendors • Is preparing oxidized mercury gas traceability protocol

  10. NIST-Traceable Hg Calibration Standards To date NIST: • Has developed draft certification procedures for elemental and oxidized mercury gas generators (vendor-prime generators) • Invited generator vendors to come in and begin certifying elemental mercury gas generators

  11. Mercury Monitoring – Other Issues • Allow time for adequate installation and certification of monitors • If you’re planning on reporting emissions using the Low Mass Emissions (LME) option, make sure your unit qualifies • If you’re installing an FGD and new stack(s) in 2009, consider petitioning the Agency for relief

  12. Questions? Comments? THANK YOU!

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