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Construction of Underground Tunnels


Quiz Questions

1.A __________________ is an excavation beneath the surface of the ground, the longer axis of which makes an angle not greater than 20 degrees to the horizontal.
Tunnel
Shaft
2. One who is capable of identifying existing and predictable hazards in the surroundings or working conditions which are unsanitary, hazardous, or dangerous to employees, and who has authorization to take prompt corrective measures to eliminate them is termed to be a ____________________.
Competent Person
Compassionate Person
3.The following topics should be part of an underground construction employee training program: Air monitoring and ventilation, Illumination, Communications, Flood control, Personal protective equipment, Emergency procedures, including evacuation plans, Check-in/check-out procedures, Explosives, Fire prevention and protection & Mechanical equipment.
True
False
4. The employer must maintain a check-in/check-out procedure to ensure that above ground personnel maintain an accurate accounting of the number of persons underground and to prevent unauthorized persons from gaining access to the site. This is especially important in the event of an emergency but is a common sense requirement at all times.
True
False
5.Portal openings and access areas must be guarded by shoring, fencing, head walls or equivalent protection to ensure that employees and equipment have a safe means to access these areas.
True
False
6.Shafts and wells more than __________ in depth entered by employees must be supported by steel casing, concrete pipe, timber, solid rock, or other suitable material.
5 feet
15 feet
7. Oil, grease, and diesel fuel stored underground must be kept in tightly sealed containers, in fire-resistant areas at least 300 feet from underground explosive magazines, and at least 100 feet from shaft stations and steeply inclined passageways.
True
False
8. A surface level tank must be connected to the underground fueling station by an acceptable pipe or hose system controlled at the surface by a valve and at the bottom by a hose nozzle.
True
False
9.Whenever an underground blasting operation in a shaft is complete, a competent person must check the air quality and make sure that no walls, ladders, timbers, blocking, and wedges have been loosened as a result of the activity.
True
False
10.If _________________________ employees work underground at one time, the employer must provide at least two 5-person rescue teams, one at the job site or within 30 minutes travel time from the entry point to the site and the other team within two hours travel time.
25 or less
25 or more