157 (1) Every employer must ensure, in respect of each workplace under its control, that
(a) no employee’s exposure to a hazardous substance exceeds the threshold limit value for that substance, as adjusted if necessary to reflect the length of the employee’s work period, or the biological exposure index for that substance;
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(e) hazardous substances are removed from storage and used in as small a quantity as is feasible;
(f) any hazard posed by a hazardous substance, including as a result of its production, storage, handling, use or disposal, is confined to as small an area as is feasible;
(j) any words or symbols that identify the contents of a container as a hazardous substance are removed once the container has been completely cleaned of that substance;
(r) if an employee is carrying out work on a piping system that contains a hazardous substance,
(i) the following engineering controls are fitted on pipes as necessary to prevent the inadvertent discharge of the substance:
(2) Each valve or other seal or mechanism referred to in subparagraph (1)(r)(i) must be secured in the open or closed position, as the case may be, using a positive mechanical device that is designed to resist being opened inadvertently, other than as a result of excessive force.
172 (1) Every dive contractor must ensure, with respect to all diving operations under its direction and control, that
(d) each diver has been certified, within the 12-month period ending on the last day of the diving operation, as being medically fit to dive by one of the following physicians and has confirmed that their medical condition has not changed since their most recent certification:
(h) the data transfer rate at the workplace is sufficient to permit continuous monitoring of a person inside a compression chamber and to allow the results of ongoing medical testing, such as electrocardiograms, to be transferred to the specialized dive physician, as determined through testing before the start of the diving operations;
(l) breathing mixtures are stored in compressed gas cylinders that have been certified by a competent person who is independent of the operator, dive contractor and manufacturer as being safe for that use;
(n) the oxygen content of each breathing mixture is analyzed by a member of the dive team on receipt of the mixture and immediately prior to each dive for which that mixture is to be used and any breathing mixture found to contain more than 25% oxygen by volume is handled as if it were pure oxygen;
(o) if a remotely operated vehicle is deployed while divers are in the water, there is a dedicated and continuous means of communication between the dive supervisor and the vehicle’s pilot and a monitor at the dive control station displays the same picture as seen by the pilot;
(2) If the diving operation involves surface-supplied diving, the dive contractor must also ensure that
(c) except in the case of an emergency, each standby diver has had 12 consecutive hours of rest since their most recent dive and has no residual inert gas in their tissue as calculated in accordance with the applicable decompression table set out in the dive project plan;
(e) sufficient double-lock deck compression chambers that have an inside diameter of at least 1.524 m and that can accommodate all divers who need to undergo decompression at any one time, as well as all other persons needing to be in the chamber with the divers to carry out the decompression procedures or provide medical care to them, are available at the workplace to allow for decompression in accordance with the applicable decompression table identified in the dive project plan; and
121 (1) Every employer must ensure, with respect to all materials handling equipment used at a workplace under its control, that
(f) the equipment is operated in accordance with its rated capacity or, if applicable, its reduced capacity as determined under paragraph (e);
(i) if the equipment is used for lifting, moving or positioning persons, it has — before its first use and after any repair or modification — been certified by a competent person who is independent of the operator and employer as being safe for that use, including in conjunction with any other equipment or device with which it is used;
(j) if the equipment is powered, it is equipped with
(ii) an emergency stopping device that, when engaged, will immediately shut down and isolate the equipment and that is within easy reach of the person operating it as well as at any other location from which it is reasonably foreseeable that a person may need to stop the equipment;
(w) all loads handled by the equipment are secured as necessary to prevent them from sliding or falling in a manner that would present a risk to the health or safety of any person;
(z.1) if the person operating the equipment does not have a clear and unobstructed view of the load and the area in which it is being operated, including the area through which the load is being moved, that person is directed by a competent person designated by the employer as a signaller who
(i) is clearly recognizable as a signaller,
(iii) has a clear and unobstructed view of the load and the area in which the equipment is being operated, including the area through which the load is being moved, or, if that is not feasible, a continuous view of another signaller who has a clear and unobstructed view of, as the case may be, the load or the portions of the area that are not within the first signaller’s view, and
(z.2) any fuel tank, compressed gas cylinder or similar container containing a hazardous substance mounted on the equipment is
(iii) marked on its caps or covers as to its contents; and
