For persons in Aransas, Bexar, Calhoun, Matagorda, San Patricio, and Travis Counties, the executive director, after consultation with appropriate local governmental agencies, may exempt a specific compound or a specific vent gas stream from the application of this chapter if the executive director determines that the emissions from the compound or specific vent gas stream will not make a significant contribution to air contaminants in the atmosphere.
30 Tex. Admin. Code § 115.901