INJURED WAS WORKING ON THE TAIL PULLEY OF THE #2 TRIPPER CONVEYOR IN THE PYT DRIVE HOUSE. INJUR ED STEPPED IN A HOLE IN THE FLOOR WHERE SOMEONE HAD REMOVED THE COVER TO HOSE THE FLOOR. INJURED WAS ATTEMPTING TO MEASURE THE SIZE OF THE TAIL HOP. WHEN HE STEPPED INTO THE HOLE. HE SUSTAINEDINJURES TO HIS LEFT KNEE, LEFT SHOULDER, LEFT RIB CAGE, LEFT ELBOW AND BACK STRAIN.