Sorry to here about this. There are thousands of similar situations in the West and maybe several hundred old coal mines in the EAst that could do a "dumper" like this.
The damn program manager sytem that EPA uses and its reliance on consultants is part of the problem. The consulting industry (IMHO) has become a commodity service and many companies dont even keep qualified folks on staff and the companies hire guys like me as only a last resort.
I had a buddy who, last year was called in to do a geotechnoical "Repair" on a retaining wall that was undermining a portal at an old mine that was slowly filling with ground water and was gonna breach. There was so much he could have done to take the stresses off (had they called him earlier)
There will be more of this unless EPA gets its **** together.
I see the media is being fed a line of "happy talk" about how well the contractors and EPA have responded.
Hows the river looking today? I hope youre not a fisherman