AN UNPLANNED ROOF FALL OCCURRED IN THE NO. 7 ENTRY ALONG THE NO. 7 BELT LINE NEAR SPAD #02813. FALL MEASURED 20'L X 20'W X 48""H. VENTILATION WAS NOT AFFECTED AND THE FALL AREA WILL NOT BE REH ABILITATED. ALL ENTRANCES TO THE FALL HAVE BEEN BREAKERED OFF.