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On May 21, 2012, the eight-county HGB area, consisting of Brazoria, Chambers, Fort Bend, Galveston, Harris, Liberty, Montgomery, and Waller Counties, was designated a marginal nonattainment area for the 2008 eight-hour ozone National Ambient Air Quality Standards (NAAQS).  Attainment of the standard is achieved when an area's design value does not exceed 75 parts per billion (ppb). However, based on 2015 monitoring data, the HGB area's design value of 80 ppb exceeded this standard. As a result, the EPA published a proposed determination of nonattainment and reclassification of the HGB 2008 eight-hour ozone nonattainment area from marginal to moderate nonattainment on September 27, 2016 (81 FR 66240). The attainment date for the HGB moderate ozone nonattainment area is July 20, 2018 with an attainment year of 2017.

In response, on December 15, 2016, the Texas Commission on Environmental Quality (TCEQ) adopted two revisions to the Texas SIP for the Houston-Galveston-Brazoria (HGB) 2008 eight-hour ozone NAAQS nonattainment area: the HGB Attainment Demonstration (AD) State Implementation Plan (SIP) Revision for the 2008 Eight-Hour Ozone Standard (Non-Rule Project No. 2016-016-SIP-NR) and the HGB Reasonable Further Progress (RFP) SIP Revision for the 2008 Eight-Hour Ozone Standard (Non-Rule Project No. 2016-017-SIP-NR).

This HGB AD SIP revision meets the requirements to demonstrate attainment of the 2008 ozone NAAQS through a photochemical modeling analysis of reductions in nitrogen oxides (NOx) and volatile organic compounds (VOC) emissions from existing control strategies and a weight of evidence (WoE) analysis. This HGB AD SIP revision also incorporates revisions to the 30 Texas Administrative Code (TAC) Chapter 115 rules to update reasonably available control technology (RACT) for VOC storage tanks in the HGB area (Rule Project No. 2016-039-115-AI). Specific revisions to the TAC can be found here.

The HGB RFP SIP revision is required by the FCAA to demonstrate both 15% emissions reduction in NOx and/or VOC for the six-year period from January 1, 2012 through December 31, 2017, as well as 3% emissions reduction in NOx and/or VOC for the one-year period from January 1, 2018 through December 31, 2018 as attainment year RFP contingency. This SIP revision also includes emissions reductions for contingency to be implemented if the area fails to achieve the targeted RFP emission reductions in 2017.

For more information, about ozone attainment in the HGB area, click here.

For more information about the SIP AD revision, click here.

For more information about the RFP SIP revision, click here.

Contact Trinity Consultants at (800) 229-6655 with further questions.