2024.12.04-Addendum 3 RU Campus Tunnel Repair 2.pdf

This is Addendum No. 3 dated December 4, 2024, for the Radford University Campus Tunnel Repair 2 Project (Project Number 217-B3217-014). The addendum addresses several pre-bid contractor questions regarding technical specifications for the tunnel repair project, including clarifications about base plate leveling approaches, tunnel element demolition requirements, soil undercutting testing criteria, and structural shoring requirements. The document specifies that engineered concrete formwork shop drawings must be submitted for tunnel top replacement in areas 1 and 3, while temporary structural shoring is required in areas 1, 3, and 4 according to specific details.

The addendum provides important contractor responsibilities, noting that contractors must protect all existing tunnel elements not being modified and are responsible for repairing any damage at their own expense. Contractors must protect piping, insulation, electrical devices, wiring, and data cabling. The document clarifies that while alternate base plate leveling methods are acceptable, they must not exceed 1/8" per foot out of level and require engineer review prior to installation. For soil undercutting assessment, if proof rolling isn't feasible, the geotechnical engineer will recommend appropriate testing methods including proctor tests, probe rods, and visual inspection.