A little more background, but the land cleanup started in the late 1990s, and was a joint effort between Universal, the EPA, and the county. It's funny because over the nearly next two decades the land would be cleaned, just as Universal set the guidance for, even though it would no longer be owned by the company. Then, shortly after re-purchasing the land back, cleaning was completed and the area was finally cleared for construction.
Weirdly the same company started and completed the cleanup on the land it briefly did not own but then did again.