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Title: Tunnels and Tunneling
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Goal: this task will increase the success of the goal to apply Cal/OSHA safety suggestions.
John Mitchell published this Cognitive Task at under Industry | Construction
Doers: 1 | Form: Cognitive Task | Phase: Engagement | Type: Pre-Event | Level: 1 | Code:
Start: Dec 12, 2019 | When: | Duration: 5 Minute(s)
  • The next Steps cover Cal/OSHA safety regulations for Tunnels and Tunneling. Where appropriate, we have referenced the code from Title 8 of the California Code of Regulations.

    The topics we will cover in this isoBlog are:

    -Hazards and Safety Orders
    -Gas Classifications
    -Pre-Job Safety Conference
    -Certified Persons
    -Diesel Engines
    -Materials, Tools and Supplies
    -Licensed Blasters

    After each of the next Steps, select the 'successful' response to indicate that you have read and understand the Step.

    Select 'successful' now and proceed.
  • Hazards and Safety Orders

    -Employees working on tunneling operations are exposed to numerous hazards, including:
    Tunnel collapses, Hazardous atmospheres and Explosive atmospheres

    -Employees working on pressurized tunneling operations may also be exposed to hazardous hyperbaric conditions

    -When employees work in tunnels and in underground chambers of any depth and in shafts planned to exceed 20 feet in depth, the following operations are subject to the Tunnel Safety Orders (TSOs):
    • Pipe-jacking and boring
    • Micro-tunneling
    • Mechanized tunneling
    • Drill and blast work
    • Excavation
    • Ground support work
    • Repair and maintenance
    • Tunnel renovations

    -Employees who are exposed to or control the exposure of others to hyperbaric conditions shall be trained in hyperbaric related physics and physiology, recognition of pressure related injuries, and how to avoid discomfort during compression. 6075(c)

    -The Mining and Tunneling (M&T) Unit of Cal/OSHA enforces the Tunnel Safety Orders (TSOs), which are detailed in the next 6 Steps below.
  • Gas Classifications

    Classifications: The M&T Unit is required to classify the gas hazards of each tunnel or shaft. These classifications are:

    -Potentially gassy
    -Extra hazardous

    Note: the request for classification shall be sent to the nearest M&T Unit office.
  • Pre-Job Safety Conference

    Before underground excavation may begin, the M&T Unit must conduct an on-site, pre-job safety conference with the project owner, the general contractor, the tunnel contractor, and the tunnel contractor’s employees.

    The goal of the conference is to ensure that all of the employees are aware of the conditions under which the tunnel will be driven and that all of the safety issues are discussed and problems resolved. 8408
  • Certified Persons

    Cal/OSHA requires the persons performing the duties of gas tester or safety representative to be certified by passing a written and an oral examination administered by the M&T Unit. 8406(f),(h)

    -A certified gas tester is required for the following operations:
    a. After blasting operations.
    b. Projects during which diesel equipment is used underground.
    c. Hazardous underground gas conditions.

    -A certified safety representative must direct the required safety and health program and must be on-site while employees are engaged in operations during which the Tunnel Safety Orders (TSOs) apply. The safety representative must have knowledge in underground safety, must be able to recognize hazards, and must have the authority to correct unsafe conditions and procedures subject to the TSOs. 8406(f)
  • Diesel Engines

    Diesel engines are the only type of internal combustion engine acceptable for use during tunneling operations, provided that the following requirements are met:

    -Cal/OSHA must issue a permit for diesel engine operation

    -Conditions of the permit must be observed

    -Ventilation and fresh air flow must meet the required minimum standards

    -Air concentrations of nitrogen dioxide, carbon monoxide, and carbon dioxide in the tunnel must be determined at least once during each shift at the peak of diesel operation and kept at or below the Permissible Exposure Limit (PELs)

    -A written record must be kept of the above readings

    -Permissible Exposure Limits (PELs) of the above air contaminants or any other contaminants must not be exceeded

    -A certified gas tester must conduct the testing (see additional requirements in 8470)

    -An approved exhaust purifier must be installed and maintained (see the requirements in 8470)
  • Materials, Tools and Supplies

    Materials, tools, and supplies being raised or lowered with a crane or hoist shall be secured or stacked to prevent the load from shifting, snagging, or falling as required in 8500.
  • Licensed Blasters

    All blasting at tunnel sites shall be carried out or directly supervised onsite by a California licensed blaster as required by Tunnel Safety Order 8560.
  • How much did this isoBlog help you to understand the Cal/OSHA safety regulations for Tunnels and Tunneling, including:

    -Hazards and Safety Orders
    -Gas Classifications
    -Pre-Job Safety Conference
    -Certified Persons
    -Diesel Engines
    -Materials, Tools and Supplies
    -Licensed Blasters

    Select your response below.
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