When making an assessment contemplated in subregulation (1), an employer or self-employed person shall take into account and keep a record of relevant factors, including the following -
(a) The noise sources to which a person may be exposed;
(b) adverse health effects that the excessive noise may have on persons;
(c) the extent to which a person may be exposed; and
(d) the nature of the work process and any reasonable deterioration in or failure of any control measures.