J. 29 CFR 1910.425 Surface-supplied air diving.
3.
Commercial surface-supplied air diving with one diver in the water
requires a minimum of three dive-team members: a DPIC (see 29 CFR
1910.410(c)), and a diver "who shall be continuously tended [by a tender
other than the DPIC] while in the water" (see 29 CFR 1910.425(c)(1)).
For surface-supplied air diving that is 100 feet or less and does not
involve planned decompression, a standby diver is not a specified
requirement for every dive. However, based on the requirements of 29
CFR 1910.421(d) Planning and a****sment, the hazard analysis and
a****sment of the dive will dictate the use of a standby diver when
underwater conditions and hazards or potential hazards involve:
proximity to an underwater suction, no free access to the surface, the
possibility of diver entanglement or entrapment, or unknown bottom
conditions. If a standby diver is required (such as when these
conditions are present or for depths that exceed 100 fsw), these duties
may be performed by the DPIC or the tender. A tender who is a qualified
diver can be the standby diver; for a three person dive-team, the DPIC
would assume tending duties when the standby diver (tender) is in the
water. A DPIC who is a qualified diver also can be the standby diver,
provided that another dive-team member is at the dive location. This
dive-team member must be trained and capable of performing the necessary
functions of the DPIC, when the DPIC is in the water as the standby
diver.
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