EE WAS WALKING ON THE WALKWAY BETWEEN THE CHANGE HOUSE AND THE TRUCK SHOP PRIOR TO THE START OF THE SHIFT. THE WALKWAY WAS SLICK. HE SLIPPED AND FELL INJURING HIS LEFT KNEE. HE WAS DIAGNOSED W ITH A POSSIBLE TORN QUADRICEPS MUSCLE IN THE LEFT KNEE. HE WAS PLACED IN A LEG BRACE, LIMITING THE RANGE OF MOTION AND RETURNED TO HIS NORMAL DUTIES THE SAME DAY.