Are underground shale wastewater pipelines the “next big thing” for the Pennsylvania midstream (i.e. pipeline) industry? According to Thomas Karam, CEO of Equitrans Midstream Corp. (formerly EQT Midstream), they just may be. Most of Equitrans’ pipeline business is flowing natural gas. A little bit of their business is dedicated to flowing wastewater. Karam wants to grow that little bit into a much bigger bit.