AN UNINTENTIONAL ROOF FALL WAS DISCOVERED ON A- MAINS AT SURVEY STATION 880. THE FALL EXTENDED FROM #6 INTERSECTION THRU 6-7 X-CUT INTO #7 INTERSECTION. APPROX. 80'L X 18'W X10'H. CONTAINED 6' RESIN BOLTS & 10' CABLE BOLTS. THE AREA WAS DEVELOPED 12/98. FALL DANGERED OFF & FLOOR & ROOF SUPPORTS ADDED AT THE APPROACHES. THE FALL WILL NOT BE CLEANDED UP.