The new statewide president of Mass Audubon has filed for intervenor status for its West Mountain Wildlife Sanctuary in Plainfield, just over the border from Berkshire County, in the federal review of the proposed Tennessee Gas Pipeline Co. project. ... "At this stage, we're optimistic that in working with the Conservation Commission and Stantec, the restoration plan will be adequate and that letter will be the only need we'll have for legal counsel," said Becky Cushing, director of the Berkshire Sanctuaries.