In the case of type 2 and type 3 asbestos work, an asbestos client must ensure that air monitoring of the concentration of airborne regulated fibres to which an employee may be exposed, is- (a) performed by an approved inspection authority;
(b) carried out in terms of HSG 248;
(c) representative of employee exposure; and
(d) carried out at a frequency determined by the approved inspection authority based on the site-specific asbestos risk assessment.