30 C.F.R. § 75.1400-4

At the completion of each daily examination required by § 75.1400, the person making the examination shall certify, by signature and date, that the examination has been made. If any unsafe condition is found during the examinations required by § 75.1400-3, the person conducting the examination shall make a record of the condition and the date. Certifications and records shall be retained for one year.