Sunoco is performing “optimization work” at the Marcus Hook export terminal this month. Marcus Hook is where two (soon to be three) Mariner East Pipelines terminate, hauling NGLs (propane, ethane, butane) from western Pennsylvania and eastern Ohio all the way to the Philadelphia area. At Marcus Hook the NGLs get separated and most (not all, but most) get loaded onto ships for export to other countries. Sunoco needs to upgrade a few things to export even more. They’re shutting down Marcus Hook this month, and that’s a (temporary) problem for the main shipper sending NGLs to the facility–Range Resources.