Final answer:
Facilities must institute a hearing conservation program when occupational noise levels exceed 85 decibels over an eight-hour period.
Step-by-step explanation:
Facilities with occupational noise levels that reach or exceed 85 decibels (dB) over an eight-hour period must institute a hearing conservation program, which includes having employee hearing regularly tested by a medical professional. This recommendation is supported by several government agencies and health-related professional associations to prevent hearing damage that could otherwise occur from prolonged exposure to high noise levels.