ENFIELD, Maine — “Everything you see in back of us here is new,” said Jason Brochu of Pleasant River Lumber. Between this mill in Enfield and another in Dover-Foxcroft, Pleasant River Lumber produces about 130 million board feet of lumber each year. The operation employs around 300 Mainers with jobs tied to logging, trucking, cabinet-making and log home businesses. Reaching that level of production required a major investment. “Since 2018, we’ve put in about 100 now, probably $80 million on this site alone,” said Chris Brochu of Pleasant River Lumber. Inside the mill, the results are hard to miss. Advanced technology now drives nearly every step of the process. …For Pleasant River Lumber, owners say protection comes not just from forest management, but from trade policy. “Canada produces way more lumber than they need, so they’ve got to dump it somewhere. And we can’t compete with that,” Jason Brochu said.