8.1. An employee qualifies for membership in this plan on the day the employee has accumulated 10 years of service.
The following years and parts of a year of service are taken into account for qualification purposes:(1) those credited in pensionable employment under the first paragraph of section 6;
(2) those credited in pensionable employment under the first paragraph of section 6 which must be credited again under section 25;
(3) those credited under section 143.3; and
(4) those which must be credited again under section 24.
For the purposes of subparagraphs 1 and 2 of the second paragraph, only the days and parts of a day for which the employee paid or was exempt from contributions must be counted in the total service, including those referred to in section 20 and those credited under section 21.