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One of the challenges faced by Energy Transfer in building its Mariner East 2 (ME2) pipeline (two pipelines) to transport NGLs from southwestern PA and eastern OH to the Marcus Hook refinery near Philadelphia was the terrain in Chester County, near Philly. The area has a karst topography--think of it as Swiss cheese underground, where there are a lot of holes carved out of the sandstone deposits over the years. ME2 didn’t create the karst topography but suffers from its presence because of frequent sinkholes that form when drilling through it. Although the drilling is long done and over, another very small sinkhole recently appeared in Chester near the ME2 pipeline.
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