AN UNINTENTIONAL ROOF FALL OCCURRED AT 97+60 ENTRY #2 ON THE 6TH NORTH. THE FALL MEASURED 100' X 19' X 5' THICK. THE FALL DID NOT IMPEDE TRAVEL OR IMAPIR VENTILATION. THE ROOF WAS SUPPORTED BY 4' FULLY GROUTED RESIN ROOF BOLTS. THE 4-WAY INTERSECTION WAS DEVELOPED 10-2001.