; or (G) refused to perform the covered employee’s duties, or exercised stop work authority, related to the employer’s activities described in section 3(1) if the covered employee had a good faith belief that performing such duties could result in injury to or impairment of the health of the covered employee or other employees, or cause an oil spill to the environment. (2) Good faith belief For purposes of paragraph (1)(E), the circumstances causing the covered employee’s good faith belief that performing such duties would pose a health and safety hazard shall be of such a nature that a reasonable person under circumstances confronting the covered employee would conclude there is such a hazard. (b) Process (1) In general A covered employee who believes that he or she has been discharged or otherwise discriminated against (hereafter referred to as the complainant ) by any employer in violation of subsection (a)(1) may, not later than 180 days after the date on which such alleged violation occurs or the date on which the covered employee knows or should reasonably have known that such alleged violation occurred, file (or have any person file on his or her behalf) a complaint with the Secretary of Labor (referred to in this section as the Secretary ) alleging such discharge or discrimination and identifying employer or employers responsible for such act. Upon receipt of such a complaint, the Secretary shall notify, in writing, the employer or employers named in the complaint of the filing of the complaint, of the allegations contained in the complaint, of the substance of evidence supporting the complaint, and of the opportunities that will be afforded to such person under paragraph (2). (2) Investigation (A) In general Not later than 90 days after the date of receipt of a complaint filed under paragraph (1) the Secretary shall initiate an investigation and determine whether there is reasonable cause to believe that the complaint has merit and notify, in writing, the complainant and the employer or employers alleged