(a) General rule.--A record shall be made of all emissions tests, preoperational examinations and maintenance and repairs of complete diesel-powered equipment packages. The records made pursuant to this section shall meet the requirements of this section.

(b) Written certification.--The individual performing the emissions test, examination, maintenance or repair shall certify by date, time, engine hour reading and signature that the emissions test, examination, maintenance or repair was made.

(c) Results.--Records of emissions tests and examinations shall include the specific results of such tests and examinations.

(d) Content.--Records of maintenance and repairs shall include the work that was performed, any fluids or oil added, parts replaced or adjustments made and the results of any subsequently required emissions testing.

(e) Preoperational examination record retention.--Records of preoperational examinations shall be retained for the previous 100-hour maintenance cycle.

(f) Certain records to be countersigned.--Records of emissions tests, 100-hour maintenance tests and repairs shall be countersigned once each week by the certified mine electrician or mine foreman.

(g) Other record retention.--Except as specified in subsection (e), all records required by this section shall be retained for at least one year at a surface location at the mine and made available for inspection by the department and by miners and their representatives.