If someone is living near the facility. Then check it out..?
If you assume there's nothing worthwhile in there, well then it will be selffullfilling profecy :-D
My plan would be to go there and have a look. (If there's someone on site, ask them for access/tour of the facility)
If anything worthwhile is found, then contact EPA and ask them for permission to rescue remaining chips.
Any offices could ofcourse also be checked out. In particular spaces that look deserted (behind drawers, storage rooms etc..). As they are the most likely location for any CSG stuff to have survived GMT. So:
* Don't wait.
* Check out site & photograph.
* Try to get indoor access.
* Get permission for anything to be removed.
Some pocket money + combo car for quick deals could be useful aswell :-D
Looking forward for the final photodocumentation of the site ..