I’ve pasted them in below:
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BC OHS Reg.
Work in Compressed Air

20.122 Medical fitness
Whenever work is carried out at an air pressure greater than 7 kPa (1 psi) above atmospheric pressure, the employer must ensure that the workers are medically examined by a physician knowledgeable in hyperbaric medicine, as required by the Board.

20.123 Compliance with standards
The employer must ensure that equipment and work processes carried out at an air pressure greater than 7 kPa (1 psi) above atmospheric pressure meet the requirements of CSA Standard CAN/CSA Z275.3-M86, Occupational Safety Code for Construction Work in Compressed Air.

[Amended by B.C. Reg. 312/2003, effective October 29, 2003.]

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There are no Guidelines on compressed air work. Hope that helps. Glenn