Dr. John Stolz: Microbiologist, independent expert on how fracking can affect well water and director of Duquesne University’s Center for Environmental Research and Education. 

Stolz worries that drillers and regulators pay too little attention to “legacy issues” — the presence of old coal mines and conventional gas wells drilled before the fracking arrived on the scene. He believes contaminants associated with mine drainage that are found in some water wells are caused by new “conduits” in the rock created by fracking. He says old mines in places like the Deer Lakes Park area might well cause problems if drilling happens. “The damage,” he says, “is gonna start popping up in places it’s never popped up before.”

http://www.pghcitypaper.com/pittsburgh/john-stolz-warns-of-danger-when-past-present-drilling-practices-collide/Content?oid=1752840#.Vmwvj_dFHY8.gmail