Engine Exhaust Emission
Extreme care must be taken when engine exhaust can build
up in work spaces, such as confined spaces, excavations, and
trenches.
A. Exhaust purifier devices must be used to maintain concentrations
of dangerous gases or fumes below maximum acceptable concentrations
if natural or forced dilution ventilation and exhaust collection
systems are inadequate.
5146
B. Use of internal combustion engines in tunnels is prohibited.
Exception: Diesel engines may be used in underground tunnels
if the engines are permitted by DOSH.
7069,
7070,
8470
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