The union filed a grievance concerning the interpretation of benefit provisions in the collective agreement, specifically regarding prescription drugs, diagnostic procedures, and the definition of 'dependent child' in the dental plan.
The union argued that the collective agreement language was clear and prevailed over the insurance plan's limitations.
The employer argued that the insurance plan's qualifiers applied and relied on bargaining history to assert latent ambiguity.
The arbitrator found no ambiguity in the collective agreement's provisions for prescription drugs and diagnostic procedures, holding that the plain language required reimbursement without the insurance plan's qualifiers.
Furthermore, the arbitrator held that the employer violated the statutory freeze period under the Labour Relations Act by unilaterally amending the dental plan's definition of 'dependent child,' and therefore could not rely on the amended definition.
The grievance was allowed.