A federal appeals court on Tuesday rejected a last-ditch bid by a coalition of environmental groups to stop the construction of a natural gas pipeline in northern Pennsylvania’s Endless Mountains.

A three-judge panel of the 2nd U.S. Circuit Court of Appeals ruled that federal energy regulators properly approved the 39-mile MARC 1 pipeline through Bradford, Sullivan and Lycoming counties. The decision clears the way for the pipeline to begin moving gas from the Marcellus Shale formation this fall.

“We have contended from the beginning that the MARC I Pipeline would be undertaken with the strongest commitment to environmental and ecological protections,” said Bill Moler, an executive with Inergy Midstream of Kansas City, Mo.

Some landowners have been fighting the company building the pipeline, contending that Inergy subsidiary Central New York Oil & Gas refused to negotiate in good faith on either monetary compensation or the pipeline’s route. The Sierra Club and two local groups challenged a decision by the Federal Energy Regulatory Commission to authorize construction, saying regulators should have performed a more thorough environmental assessment.

The New York-based appeals court said that FERC’s analysis of the pipeline’s impact was sufficient, and that regulators “reasonably concluded” that broader impacts caused by natural gas development in the Marcellus should not factor into the analysis of the project.

An attorney for the company said it’s highly unlikely either the full circuit court or the U.S. Supreme Court would agree to take on any appeal.