Agreement. – When there is a collective bargaining agreement, the duty to bargain collectively shall also mean that neither party shall terminate nor modify such agreement during its lifetime. However, either party can serve a written notice to terminate or modify the agreement at least sixty (60) days prior to its expiration date. It shall be the duty of both parties to keep the status quo and to continue in full force and effect the terms and conditions of the existing agreement during the 60-day period and/or until a new agreement is reached by the parties.