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Marsh Creek Lake – (HDD 290)

This page was last updated on January 14, 2021

Marsh Creek Lake, located in Chester County, is approximately 535 acres and located in Marsh Creek State Park. As it relates to Sunoco’s Mariner East 2 project, this location is often referred to as HDD 290.

On August 10, 2020, Sunoco spilled approximately 8,000 gallons of drilling fluid that impacted a wetland, two tributaries, and Marsh Creek Lake. On August 11, 2020, Sunoco experienced a subsidence at this same location. These two incidents resulted in the Pennsylvania Department of Environmental Protection (DEP), as well as other state and local agencies who responded to the incident, taking compliance and enforcement actions, and requiring Sunoco to mitigate, remediate, and restore the area.

This webpage has been created to collect and share the associated documents, reports, and submissions regarding this site. It will continue to be updated as new documents are submitted to DEP for review.

On September 25, 2020, Sunoco Pipeline, LP appealed the Administrative Order issued by DEP on September 11, 2020 to the Environmental Hearing Board. All documents, filings, and updates on this appeal can be found on the EHB docket for this case. – EHB Docket

In accordance with the EHB Opinion issued on December 16, 2020, DEP is currently reviewing the following submissions. Additional information will be provided once available:


Compliance and Enforcement

Remediation, Assessment, and Restoration