16 Tex. Admin. Code § 4.260
A permit for a stationary commercial solid oil and gas waste recycling facility issued pursuant to this division shall include closure standards and any requirement reasonably necessary to ensure that the permittee can meet the standards. The Commission shall determine the closure standards for a particular facility based on the type of materials stored, handled and treated at the facility, and the design and construction of the facility. A permit may include requirements for removal of all waste, partially treated waste, and recyclable product; removal of dikes, storage, liners, and equipment; recontouring of the land; collection and analyzing of soil and groundwater samples from the facility property; and post-closure monitoring.
16 Tex. Admin. Code § 4.260