While doing weekly exam located a roof fall at 92 bld old 1 rt. panel #4 bldg. which is common with 3 other bldg. 1 rt is not a active section. Fall approx. 6-9' high 16-17' wide x approx. 25-30' long cover of approx. 3000'. developed 10-04 area bolted with 6' resin bolt and 6'-9' install ii bolts. top gray laminated shale. fall will not be cleaned up.