If any employee terminates his or her employment before becoming eligible for retirement benefits, such employee shall receive a lump sum payment from the board of trustees, within 90 days after filing a written application with the board, the lump sum payment to be based on the following scale:
(1) From zero to and including the 5th year the employee shall receive 100 percent of all amounts he or she has contributed to the fund.
(2) From six to and including the 10th year the employee shall receive 100 percent of all amounts he or she has contributed plus an amount equal to one percent per year of employment contributed by the City of Gadsden.
(3) From 11 to and including the 20th year the employee will receive 100 percent of all amounts he or she has contributed plus an amount equal to two percent per year of employment contributed by the City of Gadsden.