Nuclear Waste Disposal Area 2 opened in 1994 and was operating for 5 years before it exploded on September 13th 1999, blasting the Moon out of Earth orbit. Activities were monitored from the Monitoring Depot.
The site is much bigger than Area 1 (140 times as much nuclear waste), and unlike the earlier construction, included synthocrete radiation covers and a perimeter laser fence.
The cross-shaped area had 35 silo caps. There were 12 silo caps each in the "west" and "south" wings. The "north" wing had 7 silo caps. The "east" wing only contained 4 caps. This wing had 6 black circles, which were most likely temporary caps which weren't filled yet.
Behind the scenes
There were three scales of SFX model: one for the full NDA2, one featuring the central hub with the 22" Eagle, and large sections of the silos caps, cans and barriers in scale with the 44" Eagle.
According to the Shane Johnson timeline, it is discovered - 73 days after Breakaway - that the immense fusion reaction that took place on the far side of the moon has created a huge, new 'mare' where Nuclear Disposal Area Two once was. Victor Bergman names it 'the Sea of Folly.'