If the retirement system manager determines, after considering medical advice, that a member of this plan retired on a disability retirement allowance is not physically or mentally incapacitated for service in the office or department of the city where he or she was employed and in the position held by him or her when retired for disability, he or she shall be eligible to re-enter the city service and his or her disability retirement allowance shall be cancelled forthwith upon such re-entry. If such a member eligible to reenter city service does not re-enter city employment within thirty (30) days of the date when employment is made available to him or her, his or her disability retirement allowance shall be permanently cancelled, and an amount which is the actuarial equivalent of his or her annuity at cancellation, based on an ordinary life, but not to exceed the amount of his or her accumulated contributions at the time of his or her retirement for disability, shall be credited to his or her individual account and shall be refunded to him or her. Notwithstanding any other provision of this chapter to the contrary, the civil service board shall adopt rules and regulations establishing reasonable procedures for the reentry of such members. (Prior code § 34.06.624)