Pennsylvania regulators are citing Sunoco for a three recent leaks during its construction of the Mariner East 2 pipeline project.
The Department of Environmental Protection last week issued violation notices for two leaks of drilling fluid on Nov. 11, in Chester and Berks counties.
One caused a 6-foot diameter sinkhole in a backyard.
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The other involved using an unauthorized method to go underneath a waterway.
The third citation is for a Nov. 10 leak in a Dauphin County wetland.
Construction is underway on the 350-mile pipeline that terminates in Marcus Hook.
It's expected to be completed sometime next year.