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AO Study Material Miscellaneous > TB 126 - Metro Gold Line Extension > Flashcards

TB 126 - Metro Gold Line Extension Flashcards

1
Q

The metro gold line extension project will span how many miles?

A

6 miles

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2
Q

The metro gold line extension project will be completed in what year?

A

2009

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3
Q

The metro gold line project will have how many miles of tracks below grade in underground tunnels?

A

1.8 miles

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4
Q

How far apart are the 2 tunnel boring machines placed apart?

A

25 feet

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5
Q

The metro gold line east extension tunnel depth will be how many feet below grade?

A

40 feet

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6
Q

How far apart of the 2 1/2” outlets located for the project?

A

Every 200 feet

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7
Q

During tunnel construction, intrinsically safe fans of what CFM provide ventilation and evacuate air from tunnel?

A

100,000 CFM

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8
Q

The intrinsically safe fans evacuate side from tunnel through how large of a vent pipe?

A

72 inch

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9
Q

Who has the ability to reverse the direction of the airflow of the fans if required during emergencies?

A

The contractor

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10
Q

The tunnel boring machine is approximately how many feet long?

A

300 feet

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11
Q

The tunnel boring machine can tunnel up to how many feet a day?

A

100 feet

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12
Q

What are the combustible around the tunnel boring machine limited to?

A

Hydraulic oil and lines

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13
Q

How large of an area does the shield protect around the front of the TBM?

A

20 feet

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14
Q

How many 8-passenger diesel locomotives move the the muck cars?

A

2

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15
Q

How long are the locomotives?

A

21 feet

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16
Q

How wide are the locomotives?

A

5 feet wide

17
Q

How much does the muck locomotive weigh?

A

35 tons

18
Q

Where are the 3 locations for the extinguishing system on the locomotives?

A

In front of driver
Right side of operator cab
Rear engine compartment

19
Q

What is the fuel capacity of the locomotives?

A

75 gallons

20
Q

How long is a muck car?

A

15’

21
Q

How wide is a muck car?

A

5’

22
Q

How tall are the sides of a muck car?

A

6.5’

23
Q

The muck car empty weighs how much?

A

9,000 pounds

24
Q

A loaded muck car weighs as much as how many pounds?

A

35,000 pounds

25
Q

Entry portals for the construction site are how deep?

A

80 feet

26
Q

What is a tag-in/tag-out system used for employee accountability and is a reference for first responders to determine who is working in the tunnel?

A

“Brass board”

27
Q

Each tunnel boring machine has approximately how many miners as the crew?

A

12

28
Q

During shift change how many personnel may be on site?

A

35-40

29
Q

There is a 13,000 volt AC supply in the tunnel that is transformed down to how many volts?

A

480 volts

30
Q

By law, all personnel who enter a mining (tunnel) site must wear a how many hour self-rescue device to provide means for escape from hazardous non breathable atmosphere?

A

1 hour

31
Q

All fire personnel may enter a tunnel with a non-compromised atmosphere of what provided they wear an SCBA and self rescuer respirator?

A 
Oxygen 19.5-23%
CO levels 25 ppm or less
HS2 10 ppm or less
N02 5 ppm or less
C02 5% or less
LEL 10% or less
32
Q

The Taylor brothers safety officer, supervisor, MTA inspector or gas indicators on site provide what information?

A

Tunnel atmosphere

33
Q

Entry into a compromised atmosphere should not exceed a distance of what?

A

500’

34
Q

Members entering a comprised atmosphere are limited to how many minutes of working time with a 45 and 60 minute bottle?

A

45 min: 9 min

60 min: 12 min

35
Q

Entry into a tunnel with a known compromised atmosphere beyond initial observation or testing is limited to what certified members only?

A

USAR

36
Q

The tunnel utility is assigned to what station that has 18 bio-marine brand biopak 240 re-breathers?

A

Fire station 25

37
Q

Direct fire attack in the tunnel should only be justified if there is a possibility of saving a what?

A

Life

38
Q

What should be pumped to the metro gold line construction site?

A

150 psi

39
Q

How many stations will the metro gold line extension have?

A

8

AO Study Material Miscellaneous (72 decks)

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