Investigations by commission; powers.

(b) The commission in its discretion may make such examinations or investigations as it deems necessary to determine whether any person or company has violated any provisions of this chapter, or any regulation, order or permit hereunder. For the purpose of any examination or investigation under this chapter, the chairman or any officer designated by him may administer oaths and affirmation, subpoena witnesses, compel their attendance, audit books, accounts and records, take evidence and require the production of any books, papers, correspondence, memoranda, agreements or other documents or records which the commission deems relevant or material to the inquiry.