UNINTENTIONAL ROOF FALL OCCURRED AT THIS TIME BLOCKING 2 MRS UNITS. 20' X 20' APPROXIMENTLY 6' THICK. IN INTERSECTION AND APPEARED TO BE A SLIP ON THE 003 SECTION 5TH LEFT 3 WEST MAINS #2 ENTRY SPAD 1476. DEVELOPED RECOVERY PLAN, SECURED AREA, RECOVERED MRS UNITS AND TIMBERED AREA OFF.