New Mariner East 1 Sinkhole Appears, PA PUC Shuts Down Pipeline Chester County | Energy Services | Energy Transfer Partners | Industrywide Issues | Pennsylvania | Pipelines | Regulation | Statewide PA | Sunoco Logistics January 22, 2019January 22, 2019 New ME1 sinkhole in Chester County (credit: WPVI-TV Channel 6) On Sunday a new sinkhole appeared in the backyard of a home in West Whiteland Township (Chester County), PA exposing a small portion of Energy Transfer’s Mariner East 1 (ME1) NGL pipeline. Please Login to view this content. (Not a member? Join Today!) Related