Drilling mud from the Mariner East II pipeline contaminated Marsh Creek Park in August, 2020. Times File image. Nearly two years since Sunoco Pipeline L.P. spilled drilling mud into Marsh Creek Lake and its tributaries, and more than one month past the company’s agreed-upon remediation and restoration deadline, state Sen. Katie Muth, D-44, Berks, Montgomery, and state Rep.Danielle Friel Otten, D-155,...