Layoffs at ConocoPhillips' Trainer refinery, which is in the process of being shut down, will occur during the last two weeks of January 2012.
That's according to a filing with the Pennsylvania Department of Labor & Industry.
In all, 409 workers will lose their jobs when ConocoPhillips permanently closes the Delaware County refinery it has owned since 2002. That refinery can process up to 185,000 barrels of crude oil per day, but it is one of several that the oil company has targeted for closure.
Companies are required to provide 60 days advance notice of any major plant closing. ConocoPhillips announced in late September that it had put the 91-year-old refinery on the Delaware River up for sale and immediately began the process of idling the complex.
At the time, the company said it would permanently close the Trainer refinery in six months if it was unsuccessful in its efforts to sell it.
ConocoPhillips' letter states that the layoffs will begin Jan. 16 and continue through Jan. 31. Most of the affected employees are represented by Local 10-234 of the United Steelworkers union.
In a separate filing with the Pennsylvania labor agency, the company said it was also closing pipeline operations in Aston, which will affect 10 employees. In that letter, ConocoPhillips said that it expected most employees would be redeployed within the company.