The order came in response to a filing by environmental groups that the process has polluted local waterways in Pennsylvania.
The Clean Air Council also is involved in the most serious remaining legal challenge to the pipeline, being heard in Philadelphia Common Pleas Court.
The group is suing Sunoco, saying the Mariner East 2 violates the federal and state constitutions, including Pennsylvania’s Environmental Rights Amendment.
The case is expected to go to trial at year’s end, when Sunoco hopes the pipeline will be completed.
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