D-2, r. 12 - Decree respecting the installation of petroleum equipment

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6.04.1. Employees usually working the entire year must indicate, in writing, their choice of vacation, before 1 April of the current year. The employer must post, no later than the 21 May following, a list showing the employees’ names and the vacation period they have chosen.
O.C. 351-2006, s. 4.