An employee covered by the Municipal Retirement Plan, with 10
years' vested service, who shall have rendered part-time service on
a full-time basis in conjunction with the established workweek of
the respective department, immediately prior to permanent full-time
employment, with the exception of a justified break in service, shall
be given credit for such part-time service, not to exceed four years,
provided the employee pays to the retirement system a lump sum equal
to the full actuarial value of such credit, as previously calculated
and determined by the Retirement Board. For purposes of this policy,
persons who "have rendered part-time service on a full-time basis
in conjunction with the established workweek of the respective department"
shall not include those persons who rendered only temporary, seasonal
or on-call services, regardless of whether or not they were available
to render such services on a full-time basis. Eligible employees must
make written request to the Retirement Board.