Roy Pray Portal Repairs - SOLE SOURCE

Excavate the portal area and then install a properly designed and constructed portal structure and replacement gate, with steel sets extending from approximately Station 0+84 to Station 1+12.5. It is recommended that these sets be lagged with steel channel or other steel material and that cavities overhead be filled with polyurea silicate void filling foam to prevent impact loading. As a matter of routine safety, the entire adit should be thoroughly scaled and afterwards, any rockfall or debris on the invert should be removed to eliminate unnecessary tripping hazards. Existing tripping hazards should be cleaned up as well. Rockbolting and meshing should be installed as an appropriate risk reduction measure to protect personnel during safety inspections.