Where reasonably practicable, the employer must control the exposure of an employee by-
(a) limiting the amount of an HCA used, which may contaminate the working environment;
(b) limiting the number of employees who will be exposed or may be exposed;
(c) limiting the period during which an employee will be exposed or may be exposed;
(d) using a substitute for an HCA;
(e) introducing engineering control measures for the control of exposure, which may include-
(i) process separation, automation or enclosure;
(ii) the installation of local extraction ventilation systems to processes, equipment and tools for the control of emissions of an airborne HCA;
(iii) use of wet methods; and
(iv) separate workplaces for different processes; and
(f) introducing appropriate work procedures which an employee must follow where materials are used or
processes are carried out which could give rise to exposure of an employee, and which procedures must include
written instructions to ensure-
(i) that an HCA is safely handled, used and disposed of;
(ii) that process machinery, installations, equipment, tools and local extraction and general ventilation systems are safely used and maintained;
(iii) that machinery and work areas are kept clean; and
(iv) that early corrective action may be readily identified.