59.4. An employee who has ceased to participate in this plan under the second paragraph of section 59.1 and who, at the end of a period of two years from the date on which the application for a refund of the amount referred to in that section is received, holds pensionable employment under this plan may elect to again participate in this plan by sending a notice to that effect to the Commission. Notwithstanding section 3.1, he shall participate in this plan from the date on which the notice is received by the Commission.