ROOF FALL WAS ENCOUNTERED BY THE WEEKLY EXAMINER THE 1-LEFT TAILGATE #2 ENTRY X/C 40 ABOVE THE ANCHOR ZONE. FALL MEASURES 20'X 30'X 9' HIGH. SEPARATION OF ROOF STRATA DUE TO EXPOSURE OF AIR AN D WATER OVER TIME ARE CAUSE OF FALL. ALL ACCESS TO THE FALL AREA WERE DANGERED OFF TO PREVENT PERSONS FROM ENTERING THE AREA. NO CHANGE IN VENTILATION OR BLOCKAGE OF ESCAPEWAYS RESULTED FROM