A ROOF FALL WAS DISCOVERED IN NO. 5 INTAKE ENTRY OF 2 SOUTH MAINS AT SURVEY STATION NO. 307. THE FALL MEASURED APPROX. 140' LONG BY 18' WIDE BY 8' THICK. THE FALL WILL NOT BE CLEANED UP. THERE WERE NO INJURIES OR EQUIPMENT INVOLVED. PASSAGE OF PERSONS WAS NOT BLOCKED. VENTILATION WAS NOT AFFECTED. THE FALL WAS ABOUT 3,000' OUTBY THE ACTIVE SECTION.