EE WAS ATTEMPTING TO PUT A PUMP ON TO A BARGE DECK THAT WAS APPROX 5 FT ABOVE THE PLANT LEVEL HEWAS STANDING ON. AS HE WAS CLOSE TO SETTING THE PUMP ON THE BARGE HIS RIGHT FOOT SLIPPED CAUSING HIM TO TWIST HIS LOWER BACK DUE TO STILL HAVING THE PUMP IN HIS HANDS AND CATCHING HINSELF.