Water pipes, if they can be removed, are removed. The contractor uses a water supply outside the building and pipes it in with leaky rubber hoses to the abatement area. HVAC conduits are removed. Here, the HVAC conduits and control valves were removed and replaced, but the replaced valves were not set to what they were before removal. It took campus HVAC guys months to figure out the correct settings for all the valves.
Water leaks out of the containment area.
Humidity is high. Paint on walls is damaged. Despite locked storage rooms, nowhere near the work areas, personal computers, TV's, VCR's, somehow got stolen. The contractor and workers have free access to their area of the building, or in our case, the entire building. With the main electricity off, the alarm systems didn't work.