Only the giant portal, 5.5 m (18 ft) tall, was in place when work stopped, but it gives an indication of how immense the whole task would have been.
By the time the work stopped, only the 18ft tall portal had been completed.
These regulations include both federal and State requirements that address a variety of emissions including SO2, NOx, CO, PM10, and a number of hazardous air pollutants.