(a) When a shift worker works his first scheduled day off, it shall be considered as a Saturday and shall be compensated at the time and one-half (1-1/2) rate.
(b) When a shift employee works his second scheduled day off, it shall be considered as Sunday and shall be compensated at the double time rate.
(c) When a shift worker works on his scheduled day off for a holiday, he shall be compensated for the holiday plus double time for hours worked on such day.
(d) Overtime procedure for shift workers shall be mutually agreed upon by both parties on a Divisional basis.