9. From the time the notice mentioned in section 8 is sent, the parties shall have the obligation to meet and to negotiate an agreement, diligently and in good faith. They may, at any time before the expiry of the delay of 30 days fixed by section 10, agree upon the appointment of a mediator charged with inducing them to reach an agreement.
Where the parties reach an agreement respecting essential services, the mediator, if one has been appointed, or the parties jointly must file copy thereof forthwith for the commissioner for essential services at the office of the clerk of the Court.
The agreement becomes executory from the time it is filed. A copy must be posted up by the parties in a conspicious place in the establishment.