Mine owner tried to stop EPA from drilling, was threatened with fines

From Hot Air:

Hey, remember that time when the EPA blew a hole in the side of an abandoned mine and flooded the surrounding river basin with millions of gallons of toxic sludge? Ah… good times, my friends. At the time we wondered if they were going to fine themselves for all of the ecological damage they caused. Well, no such luck, natch. But there were some fines discussed. They came up in conversation when the mine owner tried to keep them from messing around with site. Todd Hennis had some experience with the EPA in the past and they had caused some similar leaks at another property of his. This time he told them he didn’t want them in there messing around, but they made their position clear. (Washington Examiner)
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If Mr. Hennis is correct, the earlier incident was far more egregious. The EPA had collected large quantities of sludge and dumped it down a shaft in the New Mikado mine without telling Hennis that they were doing it. The chemicals later leached into the local water supply. So is somebody going to investigate precisely what these EPA characters have been up to out there in the mountains? Senator John McCain has called for an investigation, but even if they do find that some serious skulduggery has been going on, what do they do after that? I mean, who do we normally call to investigate an environmental disaster and determine what damages, if any, are due? We call the EPA. Are we going to have them investigate themselves?

What could possibly go wrong?

So, who watches the watchers? and who will fine them?