See this article in the Herald-Star. For a sample: "Earlier this week, natural gas processor MarkWest Energy announced plans to ship up to 400,000 barrels of Marcellus and Utica shale ethane out of the region for cracking by 2016. Thursday, both Range President and CEO Jeffrey Ventura and EnerVest President and CEO John Walker said they also plan to ship ethane to places such as Sarnia, Canada or Mont Belvieu, Texas for cracking. They would accomplish this by shipping the ethane in one of three pipelines: The Enterprise ATEX pipeline, the Sunoco Mariner West pipeline and the Sunoco Mariner East pipeline."