AN UNINTENTIONAL FALL OF ROOF WAS DISCOVERED ON THE 3 NORTH MAINS AT APPROX. 11 PM; THE FALL WASLOCATED IN THE #2 ENTRY, ADJACENT TO THE 8 NW PANEL, 20' OUTBY SPAD #10576. FALL MEASURES AP- PROXIMATELY 70; LONG X 18' WIDE X 7+' HIGH; AREASUPPORTED WITH 6' TENSION REBAR BOLTS. NO INJURIES - NO EQUIPMENT CAUGHT. THIS FALL WILL NOT BE CLEANED UP.