A ROOF FALL OCCURRED ON 10 NORTH BELT LINE. THE FALL MEASURED APPROX. 28 FT HIGHX 30 FT LONG X 20 FT WIDE AT NO. #28 X CUT NO. 1 ENTRY AREA WAS BOLTED WITH 8 FT COMBO BOLTS AND CROSSCUT 1 TO 2 WAS CRIBBED TRUSS BOLTED PRIOR TO THE FALL. A CLAY WEIN WAS PRESENT INT HE ROOF. NO INJURIES WERE SUSTAIN.