(a) All affected owners or operators in Brazoria, Chambers, Fort Bend, Galveston, Hardin, Harris, Jefferson, Liberty, Montgomery, Orange, and Waller Counties were required to be in compliance with this division by November 15, 1996, and shall continue to comply with this division.
(b) All affected owners or operators in Collin, Dallas, Denton, and Tarrant Counties shall be in compliance with this division as soon as practicable, but no later than May 21, 2011. If the installation of additional monitoring equipment is necessary to comply with the requirements in §115.544(b)(2)(E) of this title (relating to Inspection, Monitoring, and Testing Requirements), the owner or operator shall comply with the requirements no later than March 1, 2012. Until the monitoring equipment necessary to demonstrate compliance with the requirements in §115.544(b)(2)(E) of this title is installed, the owner or operator shall demonstrate compliance by using engineering calculations or other available monitoring or testing data.
(c) All affected owners or operators in El Paso County shall be in compliance with this division as soon as practicable, but no later than one year, after the commission publishes notification in the Texas Register of its determination that this contingency rule is necessary as a result of failure to attain the National Ambient Air Quality Standard for ozone by the attainment deadline or failure to demonstrate reasonable further progress as set forth in the 1990 Amendments to the Federal Clean Air Act, §172(c)(9).
(d) All affected owners or operators in Brazoria, Chambers, Fort Bend, Galveston, Harris, Liberty, Montgomery, and Waller Counties shall comply with the requirements in §§115.542(b), 115.544(b)(4), and 115.546(a)(1)(E) of this title (relating to Control Requirements; Inspection, Monitoring, and Testing Requirements; and Recordkeeping and Notification Requirements) as soon as practicable but no later January 1, 2009. If the installation of additional monitoring equipment is necessary to comply with the requirements in §115.544(b)(2)(E) of this title, the owner or operator shall comply with the requirements no later than March 1, 2012. Until the monitoring equipment necessary to demonstrate compliance with the requirements in §115.544(b)(2)(E) of this title is installed, the owner or operator shall demonstrate compliance by using engineering calculations or other available monitoring or testing data.

Source Note: The provisions of this §115.549 adopted to be effective December 3, 1993, 18 TexReg 8538; amended to be effective May 27, 1994, 19 TexReg 3703; amended to be effective March 7, 1996, 21 TexReg 1548; amended to be effective May 16, 2002, 27 TexReg 4113; amended to be effective June 14, 2007, 32 TexReg 3178; amended to be effective February 17, 2011, 36 TexReg 807