(a) A transporter of low-level radioactive waste must keep a copy of the manifest, signed by the generator or processor, the transporter and the next designated transporter or the owner or operator of the authorized facility, for a period of three years from the date the waste was accepted by the initial transporter.

(b) All records required under this section must be furnished to the department upon request and must be postmarked within 10 business days of receipt of a written request by the department. Such records must be made available at all reasonable times for inspection by any officer, employee or representative of the department who is duly designated by the commissioner.

(c) The three-year period of retention referred to in this section is extended automatically during the course of any unresolved enforcement action regarding the regulated activity or as requested by the commissioner.