The Clean Air Council filed a suit which sought to prevent Sunoco Pipeline from using eminent domain for the Mariner East 2 pipeline. A Philadelphia County Judge denied the Sunoco preliminary objections. Sunoco Pipeline asked the Commonwealth Court for the opportunity to appeal that Order. On June 21, 2016 the Commonwealth Court denied the Sunoco request to appeal. The Clean Air Council will now move forward with the suit seeking and order to prohibit Sunoco from attempting to use eminent domain power for Mariner East 2.