(a) Upon reasonable notice of the department, the operator, facility owner, or tank system owner of a facility must allow any designated employee or agent of the department to review and copy any books, papers, documents and records relating to compliance with this Part.

(b) Any designated employee or agent of the department may, at reasonable times and upon reasonable notice, enter and inspect a facility for purposes of assuring compliance with provisions of this Part, provided that the employee or agent is accompanied by the tank system owner, operator, or their designee.