FERC is asking backers of Atlantic Coast Pipeline LLC (ACP) and the related Supply Header Project for detailed information on “all tribal communications” related to the proposed projects.

In an environmental information request filed Tuesday [CP15-554], the Federal Energy Regulatory Commission’s Office of Energy Projects asked for “a comprehensive table of all tribal communications conducted throughout the project by” ACP and Dominion, which is backing the Supply Header Project and is the majority stakeholder in ACP.

The request also asked ACP and Dominion to confirm or otherwise update tables recently provided to FERC that list “archaeological and aboveground historic sites that have been identified in the current area of potential effects.”

The request for more details on “tribal communications” comes amid continued public backlash against the Dakota Access oil pipeline over claims that the completed review process for that project did not adequately consider Native American tribal interests impacted along its route. The protests have called for the U.S. Army Corps of Engineers to deny an easement for the pipeline to tunnel under the Missouri River.

Tuesday’s filing from FERC also follows numerous data requests and supplemental filings that have characterized the agency’s environmental review of the 600-mile, 1.5 Bcf/d mega project, which proposes building a 42-inch-diameter line across the West Virginia/Virginia mountains. Copies of the filing were directed to assorted representatives of the Army Engineers, the Fish and Wildlife Service, the Bureau of Land Management and the U.S. Forest Service.

Dominion has already pushed back the project’s original target start-up date due to FERC’s environmental review timeline. A substantial route change to address U.S. Forest Service (USFS) concerns with the project’s path through the Monongahela and George Washington national forests contributed to the delayed timeline. More recently, the USFS raised concerns about potential erosion caused by constructing the pipeline across the region’s steep slopes.

ACP would start in Harrison County, WV, and run through Virginia and into North Carolina, connecting producing areas in the Appalachian Basin to heating and electric generation demand in the Southeast. The project is a joint venture between Dominion, Duke Energy Corp. and Southern Company Gas.

The 38-mile, 30-inch-diameter Supply Header Project would cross the Pennsylvania/West Virginia border, transporting gas to be delivered on ACP. That project is being developed solely by Dominion Transmission Inc.