NORTH MAINS, 70 BLOCK, #8 ENTRY, MMU 004, 4-WAY. 20 FT. WIDE X 20 FT. LONG X 12 FT. HIGH. SUPPORT: 6 FT. 3/4 INCH RESIN BOLTS, ROOF MATS, WIRE SCREEN, CABLE TRUSS BOLTS - 2 FT. CENTERS. FALL DANGERED OFF, ADDITIONAL ROOF SUPPORT INSTALLED AROUND FALL.