All portable facilities and transient operations, such as portable rock crushers, but excluding portable hot-mix asphaltic concrete facilities, engaged in public work projects in any county except Dallas, El Paso, or Harris are exempt from the requirements of § 111.111 and § 111.113 of this title (relating to Requirements for Specified Sources and Alternate Opacity Limitations) and §§ 111.151, 111.153, and 111.155 of this title (relating to Allowable Emissions Limits; Emissions Limits for Steam Generators; and Ground Level Concentrations) if the conditions of §111.183 of of this title (relating to Requirements for Exemption) are met.
30 Tex. Admin. Code § 111.181