An agency shall discontinue payment of hazard pay differential to an employee when--
(a) One or more of the conditions requisite for such payment ceases to exist;
(b) Safety precautions have reduced the element of hazard to a less than significant level of risk, consistent with generally accepted standards that may be applicable, such as those published by the Occupational Safety and Health Administration, Department of Labor; or
(c) Protective or mechanical devices have adequately alleviated physical discomfort or distress. [56 FR 20345, May 3, 1991, as amended at 59 FR 33417, June 29, 1994]