Indiana Code Title 13. Environment § 13-26-2-5

Sec. 5. Upon the determination of the department that a sufficient petition has been filed in accordance with this chapter, the commissioner shall appoint a hearing officer, who does not have to be a state employee.  If the hearing officer is not a full-time state employee, the hearing officer is entitled to be paid reasonable:

for each day or part of a day in actual attendance at a meeting or hearing or in performance of duties.  The reasonable per diem and expenses are valid claims against the department.