A ROOF FALL OCCURED IN THE # 2 ENTRY OF THE 1ST E. MAINS @ SURVEY STATION 17 + 50. THE FALL MEASURED 30' LONG X 18.5' WIDE X 9' THICK. THIS AREA HAD BEENBOLTED WITH 9' DOUBLE LOCKS AND 6' FULLY GROUTED BOLTS. ALL APPROACHES TO THIS AREA WILL BE TIMBERED OFF.