EE WAS TURNING OFF THE WATER TO THE VACUUM PUMPS ON THE 2ND FLOOR OF THE PREP PLANT. AS HE TURNED TO WALK AWAY, HE SLIPPED ON OIL/MUD & WATER THAT HAD ACCUMULATED ON THE FLOOR. THE EE TWISTED HIS RT. KNEE & ANKLE. HE ALSO HIT HIS HEAD ON THE STORAGE TANK ON THE DOWN STREAM WALL.