“The reasonable man adapts himself to the world: the unreasonable one persists to adapt the world to himself.
Therefore all progress depends on the unreasonable man.” ― George Bernard Shaw, Man and Superman
Two contractors were awarded a contract totalling $40.8 million to do the work. The budget is $59.55 million, so there's room for unforeseen conditions which may be encountered. The dome has been inspected routinely since the late 90's, and the progress of rust and damage has been completely documented since that time. The skirt of the dome recently received similar treatment, so the AOC should have a pretty good handle on both methods and cost. Rust never sleeps.
The price tag last Jan was $10M. Typical govt project... everything they do costs more than anybody expected.