Section 49-496 - Decisions of hearing board; subpoenas; effective dateA. All decisions of the hearing board, including the majority of opinion and all concurring and dissenting opinions, shall be in writing and shall be of public record.B. A majority of the total membership of the hearing board shall concur in a decision for it to have effect.C. The chairman or, in his absence, the vice chairman may issue subpoenas to compel attendance of any person at a hearing and require the production of books, records and other documents material to a hearing. Obedience to subpoenas may be enforced pursuant to section 12-2212.D. Subject to the approval of the board of supervisors, the hearing board may adopt a manual of procedures governing its operation.E. Decisions of the hearing board shall become effective not less than thirty days after they are issued unless:1. A rehearing is granted which shall have the effect of staying the decision.2. It is determined that an emergency exists which justifies an earlier effective date.F. The hearing board may revoke or modify an order of abatement or a permit or permit revision only after first holding a hearing within thirty days from the giving of notice of such hearing as provided in section 49-498.