Each nurse shall receive a stipend of Seventy-Five ($.75) cents per hour for each hour worked on regularly scheduled weekends between 7 am on Saturday and 7 am on Monday. In addition, such stipend will be increased by an additional Seventy-Five ($.75) cents for each weekend hour worked in addition to those regularly scheduled. The stipend will be paid twice annually, in July and January, reflecting the preceding six (6) months' earnings.