The Pennsylvania Department of Environmental Protection (DEP) has responded to several reports of fluid discharges at construction sites for the Mariner East pipeline system in Chester County, including a confirmed spill at a state park.

Mariner East Pipeline Project

The agency said Sunoco Pipeline LP reported an inadvertent return on Monday in Marsh Creek State Park in Upper Uwchlan Township, where an “unconfirmed amount” of drilling fluid (mud and water) spilled into wetlands and  Marsh Creek Lake. Mitigation efforts were ongoing at the site, a DEP spokesperson said Thursday, adding that Sunoco had been working to bring in additional vacuum trucks. 

“We recognize the importance of this waterbody and are committed to allocating all necessary resources to fully remediate and restore the area,” said...