According to news stories at the time, it wasn’t.
Soil decontamination was only done at B-1. Other nearby Lockheed properties saw extensive groundwater decontamination efforts. But soil excavation/”The Stack” was only performed along the 103-acre Empire-adjacent site.
So B-6 has magically become a non-problem in that regard?
Some history here too about the neighbors. Fascinating isn’t it that any and all concerns about environmental pollution have been conveniently marginalized?
That wasn’t the story back then. But it’s still a Superfund site over there now, isn’t it?