A ROOF FALL WAS DISCOVERED ON D-4 SUB MAINS NO. 2 ENTRY AT SURVEY STATION 4331. THE FALL IS APPROX. 100 FT LONG X 18 FT WIDE X 8-10 FT HIGH. THE FALL CONTAINED 5 FT RESIN TENSION BOLTS AND WAS DEVELOPED MARCH 200. THE FALL HAS BEEN DANGERED OFF AND WILL NOT BE CLEAN UP.