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On September 23, 2009, the TCEQ commissioners proposed a revision to the Texas State Implementation Plan (SIP) for the control of ozone in the Dallas-Fort Worth (DFW) Eight-Hour Ozone Nonattainment Area.  This revision proposed several actions.

First, it updates the EPA-approved VOC Reasonably Available Control Technology (RACT) determination element of the attainment demonstration to include the state’s analysis of several control technique guidelines (CTG) issued by the EPA. Secondly, the revision proposes inclusion of associated 30 TAC Chapter 115 and 30 TAC Chapter 117 rule revisions into the Texas SIP. The Chapter 115 rulemaking proposal is based on determinations that several of the recommendations made in the EPA’s Offset Lithographic and Letterpress Printing CTG represent RACT for the DFW area. The TCEQ is proposing limitations on the VOC content of solvents used by offset lithographic printers in the DFW area by requiring reductions in fountain solution and cleaning material VOC contents and by further expanding applicability to smaller sources. The associated Chapter 117 rulemaking proposes to exempt low temperature drying and curing ovens used in mineral wool-type fiberglass and certain fiber mat manufacturing from Chapter 117 rules. The proposed exemption expansion could reduce the predicted NOx reductions for the DFW area by up to 0.1 tons per day; however, the SIP revision proposes that uncommitted surplus emission reductions from the 2009 through 2010 vehicle fleet turnover be used as a replacement reduction.

As a final action, the revision proposes to modify the contingency plan for the area’s 1997 Eight-Hour Ozone Nonattainment demonstration by removing the offset lithographic printing rule contingency measure. This modification is a parallel action to the Chapter 115 rule update. The TCEQ proposes to offset the removed measure with a portion of the emission reductions predicted from vehicle fleet turnover. The proposed contingency plan would retain two existing state VOC rule contingency measures previously identified for the DFW area applicable to petroleum-based dry cleaning and degassing and cleaning of stationary, marine, and transport vessels. The emission reductions resulting from the two remaining state VOC rule contingency measures together with the allotment for contingency of emission reductions from the fleet turnover is expected to provide a total three percent emissions reduction to the DFW attainment demonstration’s 1999 adjusted base year emissions inventory.

The TCEQ will hold two public hearings on October 29, 2009, in Austin and on November 2, 2009, in Fort Worth. The comment period for the proposed revision will open on October 9, 2009, and close on November 9, 2009.