The Illinois Environmental Protection Agency (IEPA) is continuing to work on the Sulfur Dioxide (SO2) 1-hr National Ambient Air Quality Standards (NAAQS) State Implementation Plan (SIP). Although the IEPA is not required to submit the final 1-hr SO2 NAAQS SIP until April 5, 2015, they are working closing with interested parties regarding draft language of the revised rule framework. The IEPA will be revising portions of Section 214 in the Title 35 of the Illinois Administrative Code (IAC).

IEPA has indicated that the important changes are likely to include the following:

  • State-wide limits on sulfur content of residual fuel oil and distillate fuel oil.
  • Hourly source-specific limits that will become effective January 1, 2017.
  • Continuous Emission Monitoring Systems (CEMS) will be required for some facilities with source-specific limits.
  • For facilities with source-specific limits that are not required to install a CEMS, compliance can be demonstrated via source testing every five (5) years or installation of a CEMS.
  • Compliance certifications are due by January 1, 2017 for facilities with source-specific emission limits.