30 Tex. Admin. Code § 335.446
If an emergency exists which requires the immediate placement of warning signs on contaminated property to protect the public health and safety and the property owner has not provided written consent to the placement of warning signs, an emergency order authorizing the placement of warning signs on the contaminated property may be issued without notice and a hearing by the commission or with such notice and hearing as are practicable. If an emergency order is issued by the commission pursuant to this section, the commission shall fix a time and place for a hearing to affirm, modify, or set aside the emergency order. Notice of the hearing to affirm, modify, or set aside the emergency order shall be provided in accordance with the provisions set forth in Chapter 305, Subchapter B of this title (relating to Emergency Orders, Temporary Orders, and Executive Director Authorizations).
30 Tex. Admin. Code § 335.446