WE HAD A FALL IN THE INTERSECTION OF THE TRUCK ENTRY IN THE SW MAINS NCAR SPAD# 32980. IT MEASURED 20'LONG X 40' WIDE X 6' THICK. NO PERSONNEL INVOLVED, BUT A SMALL PORTION OF TRACK WAS COVERE D, THIS SECTION OF THE ESCAPEWAY WAS RE-ROUTED. AREA HAS BEEN TIMBERED AND CRIBBED OFF.