I think you misunderstand how fracking works. Fracking works by pumping water into the earth. The water is typically not potable, because potable water is expensive. So there's no amount of "monitoring" that can prevent "leaks" because the whole point of the process is to leak. You leak water into the ground under high pressure, and that releases natural gas which can then be exploited.
The problem with fracking is not so much that it would pollute ground water, although it could well do so, but that it will pollute aquifers.
Also, whenever an industry flack says "however, done right..." I wonder if said flack recalls any time in the history of extractive industries when things were "done right." Extractive industries are at their most profitable when things are not "done right," because doing things right is expensive. As long as the costs of not doing things right can be laid off on someone else, the stockholders would sue the asses off of a company that did things "right," because such a company would not be maximizing shareholder value.
So let us not pretend that things will be done right. Let us assume instead that they will not be done right, and plan for that, because that is what is going to actually happen.