LANSING — The U.S. Army Corps of Engineers has put forward a new potential option for the replacement of the Line 5 oil pipeline.

The Corps released a new report examining the possibility of horizontal directional drilling, which would involve boring a new tunnel under the lakebed and inserting a new pipeline already assembled.

The approach would be less intensive than the proposed construction of a concrete tunnel — but the pipeline would have to be assembled above ground over a four-mile stretch.

The proposal was detailed in a supplemental environmental impact statement about six months after the release of the original report .

The agency did not publicize the update when it was released earlier this month, and public comment for the proposal closes on Dec. 5.

The Army Corps es

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