Page 245 - Safety Memo

Engine Exhaust Emission and it must be followed and kept available on the job site for
inspection by Cal/OSHA staff. 1709(d)
Extreme care must be taken when engine exhaust can build B. Structural steel erection 1710
up in work spaces, such as confined spaces, excavations, 1. A load shall not be released from its hoisting line until
trenches, and inside buildings or enclosed structures. the solid web structural members are secured at each
A. Exhaust purifier devices approved by DOSH or California connection with at least two bolts (of the same size/strength
Air Resources Board (CARB) must be used to maintain as indicated in the erection drawings) and drawn wrench-
concentrations of dangerous gases or fumes below tight. 1710(g)(1)
maximum acceptable concentrations if natural or forced 2. Steel joists or steel joist girders shall not be placed on
dilution ventilation and exhaust collection systems are any support structure until the structure is stabilized.
inadequate. 5146
1710(h)(1)(D)
Note: Approval by DOSH will be based on the Maximum 3. When steel joist(s) are landed on a structure, they shall
Allowable Standards for Internal Combustion Engine Exhaust
Emissions as set forth in 5146(c). be secured to prevent unintentional displacement prior to
installation. 1710(h)(1)(E)
B. When employees enter shafts (20 ft. or less), culverts, or
pipelines where a hazardous atmosphere exists or is 4. Floors must be planked at every other story or 30 ft.,
reasonably expected to exist, a mechanical ventilation system whichever is less. 1635(b)(3), 1710 (l)(7)
shall be provided to prevent exposure to engine emissions. 5. A floor must be installed within two floors below any tier
1533(b) of beams on which erection, riveting, bolting, welding, or
C. Internal combustion engine-driven equipment can be painting is being done; otherwise, fall protection is
operated inside buildings or enclosed structures only when it required. 1635(b)(2)
does not result in exposure to dangerous gases or fumes as per 6. Fall protection is required when workers are connecting
5155. 1533(a). beams where the fall distance is greater than two stories
D. Use of internal combustion engines in tunnels is prohibited. or 30 ft., whichever is less. 1710(m)(1)
7070(a) Note: At heights over 15 ft. and up to 30 ft., workers
Exception: Diesel engines may be used in underground tunnels performing connecting operations must wear personal
if the engines are permitted by DOSH. 7069, 7070, 8470 fall protection that gives them the ability to tie off.
7. During work other than connecting operations, fall
protection is required where the fall distance is greater
Erection and Construction than 15 ft. 1710(m)(2)
Every year many workers lose their lives or are seriously injured 8. Before any steel erection begins, the controlling contractor
when they fall or are crushed or struck because the structure must provide the steel erector written notifications related
they are erecting shifts or collapses. The following SOs address to concrete strength and anchor bolt repair/replacement.
these hazards: 1710(c)
9. Prior to removal of planking or metal decking, all
A. Truss and beam requirements
employees must be instructed in the proper sequence of
1. Trusses and beams must be braced laterally and removal and safety. 1635(b)
progressively during construction to prevent buckling or 10. Requirements for the working area where floor openings
overturning. The first member shall be plumb, connected,
braced, or guyed against shifting before succeeding are to be uncovered: 1635(c)
members are erected and secured to it. 1709(b) a. The area must be in the exclusive control of steel
2. An erection plan and procedure must be provided for erection personnel and shall be barricaded to prohibit
trusses and beams more than 25 ft. long. The plan must be unauthorized entry.
prepared by a California-registered Professional Engineer, b. The floor area adjacent to the floor opening shall be

48 Cal/OSHA Pocket Guide for the Construction Industry June 2019 Cal/OSHA Pocket Guide for the Construction Industry | June 2019 49