The Federal Energy Regulatory Commission wants assurances from the Tennessee Gas Pipeline Co. as it considers allowing the company to begin clearing trees for the Connecticut Expansion Project.

Federal regulators, who certified the project two weeks ago, wrote to Tennessee Gas Pipelineย on Friday with a request for additional information before allowing it to begin tree felling along the projectโ€™s 13.4 mile-path in order to beat a March 31 U.S. Fish and Wildlife Service deadline.

Meanwhile, a group of opponents in the Berkshire County town of Sandisfield, which would be affected by the pipeline looping project, have formally asked the federal commissionย to deny the request by Tennessee Gas to begin cutting, saying it has not obtained a permit required under the federal Clean Waters Act.

And in a related development, U.S. Sen. Elizabeth Warren, D-Mass., issued a statement about the company pushing forward with its pipeline project.

โ€œIt is deeply troubling that Kinder Morgan is demanding a right to bypass the Massachusetts constitution and destroy portions of the Otis State Forest. Corporate profits should not come ahead of the Commonwealthโ€™s laws or our core environmental protections. Itโ€™s long past time for the Federal Energy Regulatory Commission to stop enabling Kinder Morganโ€™s reckless behavior โ€” and start pushing back.โ€

The federal commissionย in its filing Friday asks the company to clarify that it will not fell trees โ€œwhere it has not obtained an easement or purchase of property,โ€ including a two-mile stretch through Otis State Forest protected under Article 97 of the Massachusetts Constitution.

A hearing on a lawsuit brought by Tennessee Gas Pipeline against the state of Massachusetts and its Department of Conservation and Recreation, along with the agencyโ€™s commissioner and the Sandisfield Board of Assessors, is scheduled for Berkshire Superior Court at 2 p.m. Thursday.ย It could decide whether to grant eminent domain to begin work along the route in Sandisfield. The Massachusetts attorney general plans to file a response on Tuesday.

The federal commissionย also calls on Tennessee Gas Pipeline to identify any proposed private access roads that would be used and to confirm that it has authorization from landowners, along with the status of all permits for any road improvements that are required for tree felling activities.

The company is also required to provide evidence that two field offices of the U.S. Army Corps of Engineers, the Massachusetts Department of Environmental Protection and its Connecticut counterpart all agree that a Section 404 Clean Water Act permit is not required for non-mechanized tree felling.

It is also required to provide evidence it has received clearance for bald and golden eagles from the Massachusetts Department of Fisheries and Wildlife Natural Heritage and Endangered Species Program and Connecticutโ€™s Natural Diversity Database.

The federal commission also requires Tennessee Gas Pipeline to provide a plan for ensuring that no ceremonial stone landscapes, including features, landscapes and their alignments would be affected by tree-felling activities in Massachusetts.

It also wants a project schedule with specific information about an environmental inspection and the sequence of activities to be conducted โ€œto mark the extent of approved areas of the rights-of-way, additional temporary workspaces, sensitive resources (e.g., wetlands and water bodies), and approved access roads prior to tree felling,โ€ along with details about environmental training for on-site personnel.

Tennessee Gas Pipeline has written to the commission, stating that, โ€œIssuance of a certificate is now criticalโ€ for the Connecticut project because of a tree-clearing window that closes March 31 to protect migratory bird species that use the trees for spring nesting.

The company, which has also asked the U.S Fish and Wildlife Service to extend its cutting deadline to May 1, says it needs to begin work to have the pipeline project ready for its customers by Nov. 1, 2018.

In its filing with the federal commission, Sandisfield Taxpayers Opposing the Pipeline called statements by Tennessee Gas Pipeline about federal permits required โ€œmisleading at best.โ€

The group, in its filing with the regulatory agency on Friday, writes, โ€œAt the outset, Tennessee admits in its request that it has not, in fact, obtained all of the federal authorizations which it requires in order to proceed. Despite this, it attempts to gloss over its lack of authorization by focusing on the authorizations it has received. For example, Tennessee states in its Request that it will not require a permit from the U.S. Army Corps of Engineers under Section 404 โ€ฆ for its proposed tree clearing activities. Under normal circumstances, tree clearing with hand-held equipment during March and April might not โ€œrut soil or cause damage to the root systems.โ€ However, this premise assumes that the ground will be frozen during the times allotted. Tennessee ignores the fact that this past winter has been anything but โ€œusual.โ€

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