The employer brought a preliminary motion to dismiss two grievances alleging workplace harassment, arguing they were barred by a prior Memorandum of Settlement (MOS) and the principle of the sanctity of grievance settlements.
The arbitrator found that the release clause in the MOS explicitly applied only to circumstances up to the date of signing, and the new grievances concerned a subsequent incident.
The employer's primary motion was denied.
However, the arbitrator upheld the employer's alternate motion, ruling that the union could not lead evidence relating to the prior settled grievances as background or context, as doing so would undermine the sanctity of the settlement.