In 2002, prior to being owned by Maple Leaf, Schneiders negotiated a collective agreement with their employee association, and rather than reduce any wages of any of their current employees at that time, they introduced a second tier of wages for any new hires that would join the company after that date. So as retirements have increased and a younger population has come into the plant, it has come in at the lower wage rate.
On April 3rd, 2008. See this statement in context.