An employer shall -
(a) without prejudice to sections 19 and 20 of the Act, where employees are liable to be exposed to noise at work above a lower exposure action value, in consultation with the employer's employees or their representatives, or both, make a suitable and appropriate assessment of the risk arising from such exposure,
(b) in carrying out the risk assessment referred to in paragraph (a), if necessary measure the levels of noise to which the employer's employees are exposed,
(c) be responsible for the assessment referred to in paragraphs (a) and (b) being planned and carried out competently at suitable intervals and for ensuring that any sampling is representative of the daily personal exposure of an employee to noise,
(d) ensure that the methods and apparatus used in the measurement of noise at work for the purposes of this Chapter are adapted to -
(i) the prevailing conditions, particularly in the light of the characteristics of the noise to be measured,
(ii) the length
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