The company heading a cleanup project at the Idaho National Laboratory is laying off 121 employees, the Post Register in Idaho Falls reports.

CH2M-WG Idaho LLC, also known as CWI, started laying off people Sept. 24, according to CWI spokesman Erik Simpson. The layoffs are part of a restructuring that was expected as the cleanup work continues.

"Since 2005, when CWI assumed the cleanup project, we have been upfront with employees that we are working ourselves out of a job," Simpson said.

The laboratory site is contaminated with waste generated from past weapons testing, government-owned research and defense reactors, laboratory research, and defense missions at other federal sites. The work includes treating liquid waste, removing radioactive waste and demolishing reactors, spent nuclear fuel storage basins, and labs used for radioactive experiments. The cleanup is expected to continue until 2015.

Construction workers, engineers, administrators and managers were affected by the latest layoffs, including union and nonunion workers. Most of the workers have already left, but some will finish out their tenure Thursday.

In January, CWI laid off about 130 employees — also part of the workforce restructuring plan. Once this round of layoffs is complete, CWI will employ about 1,000 employees, Simpson said.