|(a) Retention period. A person shall retain current records relating to the radiation exposure levels of equipment and the disposal of oil and gas NORM waste for at least five years. Such records shall include the information specified in this section and in §4.605 of this title (relating to Identification of Equipment Contaminated with NORM). (b) Equipment. The owner or operator of the lease, unit, or facility shall maintain records of the radiation exposure levels of equipment, the date the exposure levels were determined, and the location and identification of the equipment. (c) Waste generation. The operator of the lease, unit, or facility at which oil and gas NORM waste was generated shall maintain records that include: (1) the identity of the property where the oil and gas NORM waste was generated, including the Commission district; field; lease, unit, or facility; and producing formation, if known; (2) the identity of the facility, site, or well where the oil and gas NORM waste was disposed of; (3) the physical nature (such as pipe scale, contaminated soil, basic sediment, or equipment) of the oil and gas NORM waste; (4) the volume of oil and gas NORM waste the person disposed of at that facility, site, or well; and (5) the radioactivity level(s) of the oil and gas NORM waste (in pCi/g of Radium-226 combined with Radium-228 and any other NORM radionuclide for soil and other media such as pipe scale, contaminated soil, basic sediment, etc., or in µR/hr for equipment). (d) Disposal. Each person who disposes of oil and gas NORM waste shall maintain records that include the identity of the operator of the lease, unit, or facility at which the oil and gas NORM was generated and the information required under subsection (b) or (c) of this section. (e) Extension during investigation. Each operator shall retain any documents or records that contain information pertinent to the resolution of any pending Commission enforcement proceeding beyond any time period specified in this subchapter until the resolution of the proceeding. (f) Examination and reporting. Any person who keeps records required by this subchapter shall make the records available for examination and copying by the Commission during reasonable working hours. Upon request of the Commission, the person who keeps the records shall file such records with the Commission.