OREGON — A large mid-valley employer and wood pulp producer has entered a formal enforcement process with the state’s clean air regulator after failing to record accurate emissions figures for three weeks in the fall. Halsey-based Cascade Pacific Pulp could face fines or corrective orders after an apparently leaky monitoring system recorded invalid data and caused the mill to operate out of compliance with its major federal air pollution permit, according to a March 1 pre-enforcement notice. Oregon Department of Environmental Quality alleges in the document Cascade Pacific “posed the risk of significant environmental harm” when the mill didn’t appropriately record how many tons of carbon monoxide it emitted as part of its daily operations. Cascade Pacific converts sawdust and chips from commercial wood milling into fibrous pulp used by other factories to make toilet paper, paper towels and fiber-cement siding for houses.