EE WAS CLEANING C-34 TRIPPER CHUTE @ APPROX 1:30 A.M. HE HAD BOTH FEET LOCATED AT THE BOTTOM OF THE CHUTE OPENING WITH HIS TOES PROTRUDING INSIDE THE CHUTE & EXPOSED TO FALLING MATERIAL. HE HA D BEGUN CHIPPING ON THE BUILDUP IN THE CHUTE WHEN A LARGE CHUNK FELL ACROSS HIS RIGHT FOOT.