Diesel Law Exam No. 6 Questions taken from the Pennsylvania Bituminous Mine Officials Exam Study Guide Progress Indicator: Question 1 of 10 1.  Trained individual on duty. -- At least one individual ______________ and disposal of diesel fuel spills shall be on duty at the mine when diesel-powered equipment or mobile fuel transportation equipment is being used or when any fueling of diesel-powered equipment is being conducted.  [411(c)] Choices: certified in the cleanup hazmat trained in the cleanup specially trained in the cleanup who has been qualified in the cleanup