(a) For the Beaumont-Port Arthur, Bexar County, Dallas-Fort Worth, El Paso, and Houston-Galveston-Brazoria areas, the following exemptions shall apply:
  (1) Storage tanks at loading facilities with capacities less than or equal to 2,000 gallons (7,571 liters) are exempt from the requirements of §115.531(a)(3) of this title (relating to Emission Specifications).
  (2) Storage tanks at loading facilities that store volatile organic compounds (VOC) with vapor pressures less than or equal to 4.1 psia (28 kPa) at 68 degrees Fahrenheit (20 degrees Celsius) are exempt from the requirements of §115.531(a)(3) of this title (relating to Emission Specifications).
  (3) Storage tanks containing VOC with vapor pressures less than or equal to 1.5 psia (10.3 kPa) at 68 degrees Fahrenheit (20 degrees Celsius) are exempt from the requirements of §115.532(a)(1)(B) of this title (relating to Control Requirements).
  (4) Centrifuges and filters which process liquids containing VOC with vapor pressures less than 0.5 psia (3.4 kPa) at 68 degrees Fahrenheit (20 degrees Celsius) are exempt from the requirements of §115.532(a)(2) of this title (relating to Control Requirements).
  (5) Any individual unit which, when uncontrolled, will emit a combined weight of VOC less than 15 lbs. (6.8 kg) in any continuous 24-hour period is exempt from the provisions of §115.531(a) and §115.532(a) of this title.
(b) For Gregg, Nueces, and Victoria Counties, the following exemptions shall apply.
  (1) Storage tanks at loading facilities with capacities less than or equal to 2,000 gallons (7,571 liters) are exempt from the requirements of §115.531(b)(3) of this title (relating to Emission Specifications).
  (2) Storage tanks at loading facilities that store VOC with vapor pressures less than or equal to 4.1 psia (28 kPa) at 68 degrees Fahrenheit (20 degrees Celsius) are exempt from the requirements of §115.531(b)(3) of this title (relating to Emission Specifications).
  (3) Storage tanks containing VOC with vapor pressures less than or equal to 1.5 psia (10.3 kPa) at 68 degrees Fahrenheit (20 degrees Celsius) are exempt from the requirements of §115.532(b)(1)(B) of this title (relating to Control Requirements).
  (4) Centrifuges and filters which process liquids containing VOC with vapor pressures less than 0.5 psia (3.4 kPa) at 68 degrees Fahrenheit (20 degrees Celsius) are exempt from the requirements of §115.532(b)(2) of this title (relating to Control Requirements).
  (5) Any facility which, when uncontrolled, will emit a combined weight of VOC less than 550 pounds (249.5 kg) in any continuous 24-hour period is exempt from the provisions of §115.531(b) of this title (relating to Emission Specifications) and §115.532(b) of this title (relating to Control Requirements).

Source Note: The provisions of this §115.537 adopted to be effective February 19, 1990, 15 TexReg 549; amended to be effective July 17, 1991, 16 TexReg 3729; amended to be effective August 1, 1992, 17 TexReg 4683; amended to be effective May 22, 1997, 22 TexReg 4213; amended to be effective May 16, 2024, 49 TexReg 3292