Canada Occupational Health and Safety Regulations (SOR/86-304)

18.41 Every employer shall maintain a record of each air quality test performed pursuant to section 18.24 for a period of five years after the date on which the test was made.

18.42 Every employer shall maintain a record of each equipment inspection, test, maintenance and calibration performed pursuant to paragraph 18.26(1)(b) for a period of five years after the date on which the inspection, test, maintenance or calibration was performed.

18.43 Underwater approaches to water control and intake facilities where underwater pressure differentials may be encountered shall be made in accordance with sections 18.44 to 18.46.

18.44 Every employer shall ensure that a diver working near a facility referred to in section 18.43 wears a lifeline tended from a position outside the approach area.

18.45 Every employer shall ensure that any diver required to approach an underwater intake pipe, tunnel or duct is provided with the means to differentiate the intake from any other similar intake in the dive area.

• 18.46 (1) Subject to subsection (2), every employer shall ensure that

  • (a) a diver is not allowed to approach any underwater intake or structure where underwater pressure differentials may be encountered until the flow of water is stopped or controlled; and

  • (b) the flow of water is not re-established until the diver leaves the water or until the dive supervisor has determined that the diver is clear of the approach area referred to in paragraph (a).

• (2) Where the flow of water referred to in subsection (1) cannot be stopped, the employer shall assess the safety of a diver approaching the intake by determining flow patterns using reliable indicators, direct measurements or calculations.

18.47 No employer shall permit a diver to approach a work place that may be hazardous because of the operation of machinery or equipment, unless the machinery or equipment is secured against inadvertent movement and made inoperable for the duration of the dive.

18.48 Where there is a likelihood that a diver may be entrapped, the employer shall ensure that

• (a) a two-way voice communication system between the diver and the diver’s tender is provided; and

• (b) a second dive team, equipped to rescue a diver in the event of an emergency, is present at the dive site.