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State Recommended Redesignation Substitute (RS) SIP Revision for the DFW One-Hour and 1997 Eight-Hour Ozone Standard Nonattainment Area.

The 2008 ozone State Implementation Plan (SIP) requirements rule includes a mechanism, called a redesignation substitute, that allows for lifting the anti-backsliding obligations under a revoked NAAQS. Therefore, on April 27, 2016, TCEQ will consider adoption of the DFW Area Redesignation Substitute SIP Revision for the one-hour and 1997 eight-hour ozone NAAQS. This redesignation substitute SIP revision satisfies the anti-backsliding obligations for the revoked one-hour and the revoked 1997 eight-hour ozone NAAQS and ensures that the EPA's requirements for the redesignation of revoked ozone standards are met for the DFW four-county one-hour and nine-county 1997 eight-hour ozone nonattainment areas.

If this redesignation substitute is approved by the EPA, anti-backsliding obligations under the revoked one-hour and the revoked 1997 eight-hour ozone NAAQS would be lifted for the DFW four-county and nine-county areas, serious area NSR permitting thresholds would no longer apply, and the offset for permitting new emissions would be lowered. The nine-county area is currently classified as a moderate ozone nonattainment area for the 2008 eight-hour ozone NAAQS.

For more background information and to learn about the possible implications for the DFW area, click here. To determine how these changes might affect your facility and future projects or compliance, call Trinity Consultants at (972) 661-8100 to speak with a permitting specialist.