An employer or self-employed person shall -
(a) in respect of a workplace under his or her control cause an assessment to be done within six months after
the commencement of these regulations and thereafter at intervals not exceeding two years, to determine if any person may be exposed to noise which is at or above the noise-rating limit, regardless of whether any personal hearing protectors are used; and
(b) cause the results of the assessments to be entered into the records as required by regulation 11.