I give up.
The Eco-USA superfund pages formerly contained about 1,750 separate links to U.S. EPA documents. Each referenced document discussed the characteristics of a particular National Priority List site.
Unfortunately, U.S. EPA is in the habit of constantly reorganizing their website and renaming their web pages. Looking back, I wish I'd kept track of how often this has happened, though perhaps it's best I didn't. Knowing would likely only raise my blood pressure.
I don't know why all this movement was apparently necessary, but ultimately, the reasons don't matter. From my perspective, what matters is that every time this happened, fixing the damage required locating and revising 1,750 links.
That's very time-consuming, and after the second revision of 2016, I decided to throw in the towel and let the formidable technology of Google play hide-and-seek with U.S. EPA.
With luck, the links should take you to a page of Google search results relevant to the superfund site of interest.