EE WAS CHECKING A DRAINAGE DITCH AT THE OUTSIDE SUPPLY YARD. HE STEPPED ON A METAL COVER OVER THE DITCH AND THE COVER GAVE WAY. HE FELL INTO THE DITCH BRUISING HIS RIGHT THIGH AND RIGHT HIP. T HE COVER HAD NOT BEEN PROPERLY POSITONED OVER THE DITCH AND IT SLIPPED AWAY WHEN THE EE STEPPED ON IT. HE FELL ABOUT 3 FEET TO BOTTOM OF DITCH. NO OTHER FRACTORS WERE INVOLVED.