TB 126 - Metro Gold Line Extension Flashcards
The metro gold line extension project will span how many miles?
6 miles
The metro gold line extension project will be completed in what year?
2009
The metro gold line project will have how many miles of tracks below grade in underground tunnels?
1.8 miles
How far apart are the 2 tunnel boring machines placed apart?
25 feet
The metro gold line east extension tunnel depth will be how many feet below grade?
40 feet
How far apart of the 2 1/2” outlets located for the project?
Every 200 feet
During tunnel construction, intrinsically safe fans of what CFM provide ventilation and evacuate air from tunnel?
100,000 CFM
The intrinsically safe fans evacuate side from tunnel through how large of a vent pipe?
72 inch
Who has the ability to reverse the direction of the airflow of the fans if required during emergencies?
The contractor
The tunnel boring machine is approximately how many feet long?
300 feet
The tunnel boring machine can tunnel up to how many feet a day?
100 feet
What are the combustible around the tunnel boring machine limited to?
Hydraulic oil and lines
How large of an area does the shield protect around the front of the TBM?
20 feet
How many 8-passenger diesel locomotives move the the muck cars?
2
How long are the locomotives?
21 feet
How wide are the locomotives?
5 feet wide
How much does the muck locomotive weigh?
35 tons
Where are the 3 locations for the extinguishing system on the locomotives?
In front of driver
Right side of operator cab
Rear engine compartment
What is the fuel capacity of the locomotives?
75 gallons
How long is a muck car?
15’
How wide is a muck car?
5’
How tall are the sides of a muck car?
6.5’
The muck car empty weighs how much?
9,000 pounds
A loaded muck car weighs as much as how many pounds?
35,000 pounds
Entry portals for the construction site are how deep?
80 feet
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?
“Brass board”
Each tunnel boring machine has approximately how many miners as the crew?
12
During shift change how many personnel may be on site?
35-40
There is a 13,000 volt AC supply in the tunnel that is transformed down to how many volts?
480 volts
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?
1 hour
All fire personnel may enter a tunnel with a non-compromised atmosphere of what provided they wear an SCBA and self rescuer respirator?
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
The Taylor brothers safety officer, supervisor, MTA inspector or gas indicators on site provide what information?
Tunnel atmosphere
Entry into a compromised atmosphere should not exceed a distance of what?
500’
Members entering a comprised atmosphere are limited to how many minutes of working time with a 45 and 60 minute bottle?
45 min: 9 min
60 min: 12 min
Entry into a tunnel with a known compromised atmosphere beyond initial observation or testing is limited to what certified members only?
USAR
The tunnel utility is assigned to what station that has 18 bio-marine brand biopak 240 re-breathers?
Fire station 25
Direct fire attack in the tunnel should only be justified if there is a possibility of saving a what?
Life
What should be pumped to the metro gold line construction site?
150 psi
How many stations will the metro gold line extension have?
8
