A roof fall (15' l X 5'H x 14' W) was found on the old 6-North Track between location # 294.6 and 295.3 just outby the old 6-M. This did obstruct the walkway but did not involve any other compliance issues. No equipment was involved and no other 50.20 criteria applies. The cause of the roof fall is undetermined at this time. Fall will be supported and walkway reestablished.