Since these improvements, the contamination site has passed all of its five-year reviews with the solution deemed "protective of human health and the environment."

In 1993 and 1999, five-year reviews concluded that the site is not a danger to human health or the environment.

A third five-year review in 2004 concluded that the paving and drainage better protected human health and the environment.

If the Commission decides to conduct a full five-year review, it will typically complete the review within 360 days of initiation.

In 2007 a five-year review of its endangered status was completed, and its status was continued unchanged.

Substantive issues concerning the treaty could also be raised in those meetings, as well as in more extensive five-year reviews.

"They offer really good earnings growth," he said, "and they just went through a five-year regulatory review and got a good deal."

No issues with the remedy's short-term protectiveness have been identified in any of the five-year reviews.

EPA will conduct another five-year review prior to June 2016.

The next five-year review will be completed by September 2016.