At the time of inauguration of inspection, each plant owner or operator shall make known to the Branch Chief, in writing on MPES Form 79-038 (Rev. 10/11), Schedule of Operations, which is incorporated by reference, their plant's regular scheduled work days and time of operation. Any deviation from this schedule, other than occasional deviations of not more than two hours at the end of a scheduled work day, made necessary by unforeseen work stoppage or new commitments, shall be brought to the attention of the area supervisor or the chief prior to the time of deviation.