and Agriculture shall maintain records that document uses of the authority provided by this section. (h) (1) For prevailing rate employees described in section 5342(a)(2)(A) who meet the requirements in subsection (a)(l) to qualify as a covered employee, premium pay may not be paid to the extent it would cause the aggregate of the employee’s basic pay and premium pay in the applicable calendar year to exceed the rate of basic pay payable for a position at level II of the Executive Schedule under section 5313, as in effect at the end of such calendar year. (2) For the purposes of this subsection, the term basic pay means wages, environmental differential pay, and night shift differential pay, and the term premium pay means overtime pay, Sunday premium pay, and holiday premium pay.