TB 126 METRO GOLD LINE EASTSIDE EXTENSION CONSTRUCTION PHASE Flashcards
TB 126 METRO GOLD LINE CONSTRUCTION PHASE”
A 4” water supply system provides cooling for the TBM and water for firefighting operations. This system is equipped with 2-1/2” NST outlets every 200 feet within the tunnel and a Fire Department connection located above ground next to the hydrant at Bailey Street and Pennsylvania Avenue (southwest corner).
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TB 126 METRO GOLD LINE CONSTRUCTION PHASE”
Excavation of earth is accomplished with a Tunnel Boring Machine (TBM), which is approximately 300 feet long and can tunnel up to 100 feet a day.
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TB 126 METRO GOLD LINE CONSTRUCTION PHASE”
There is a 13,000-volt AC supply in. the tunnel that is transformed down to 480 volts.
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TB 126 METRO GOLD LINE CONSTRUCTION PHASE”
If the atmosphere in the tunnel is compromised, entry will be limited to US&R certified members wearing re-breathers.
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TB 126 METRO GOLD LINE CONSTRUCTION PHASE”
The On-Site Safety Plan advocates that injured victims are to be brought to the portal and crane-lifted on a Stokes Litter Basket by Construction Workers to grade level. Fire Department resources should coordinate operations with the “Crane Operator who will facilitate moving the victim and/or provide current situation status. Consideration should be given to assigning a member with the operator to,rnaintain positive communications.
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TB 126 METRO GOLD LINE CONSTRUCTION PHASE”
First responders, in order to facilitate a rescue, may utilize on-site monitoring experts to determine atmospheric safety levels, as long as work in the affected area is deemed safe for tunnel construction workers.
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TB 126 METRO GOLD LINE CONSTRUCTION PHASE”
All Fire personnel may enter a tunnel with a non-compromised atmosphere (oxygen levels between 19.5-23%, CO levels no greater than 25 ppm, H2S no greater than 10 ppm, N02 no greater than 5 ppm, C02 levels no greater than 5%, LEL no greater than 10%), provided they wear a SCBA and a Self-Rescuer respirator. First responders may obtain tunnel atmospheric information from the Traylor Brothers Safety Officer, a Traylor Brothers Supervisor, an MTA Inspector, or from the gas indicators located in the onsite construction trailer.
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TB 126 METRO GOLD LINE CONSTRUCTION PHASE”
These allowable atmospheric readings will be posted in the contractor’s trailer immediately adjacent to the gas indicators. It should be noted that if a Department issued 3-gas monitor registers an alarm, the area should be considered a compromised atmosphere, as the monitor is pre-set for allowable oxygen levels, CO levels, and LEL.
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TB 126 METRO GOLD LINE CONSTRUCTION PHASE”
Self-Rescuer respirators are maintained and stored at each portal entry by the contractor for the specific use of LAFD personnel.
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TB 126 METRO GOLD LINE CONSTRUCTION PHASE”
Compromised Atmosphere:
Entry into a known compromised atmosphere (any reading other than the approved NIOSH levels-
see non-compromised atmosphere) makes the breathing apparatus policy more restrictive. A SCBA and a Self-Rescuer respirator is required, however personnel are limited to initial observation or atmospheric testing with the following conditions:
- A two-member” team that is in sight of the surface (in the vertical shaft).
- A four-member team if they will be out of sight of the vertical shaft.
- A back-up team is standing by.
- Entry into a compromised atmosphere does not exceed a distance of 500’. Members entering a compromised atmosphere under the above conditions are limited to 12 minutes working time with a 60-minute bottle and 9 minutes with a 45-minute bottle, thereby allowing sufficient air reserve to exit the tunnel.
Entry into a tunnel with a known compromised atmosphere beyond initial observation or atmospheric testing is limited to US&R certified members only.
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TB 126 METRO GOLD LINE CONSTRUCTION PHASE”
The Tunnel Utility is assigned to Fire Station 25. The Tunnel Utility is a Department Van with 18 complete Bio-Marine brand “Biopak 240” re-breathers, Cyalumne glow sticks and other pertinent tools and equipment to support the use of the re-breathers.
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TB 126 METRO GOLD LINE CONSTRUCTION PHASE”
direct fire attack should only be justified if there is a possibility of saving a life. In the event of a fire, companies will have a water supply via the four-inch contractor’s water supply pipe.
The water system in the tunnel, during construction, consists of a:
- 4-inch temporary pipe supplied by a hydrant
- 2%” Fire Department outlet every 200’
- Fire Department connection located next to the hydrant at ground level.
Engineers shall pump a max. of 150 psi into the Fire Department connections.
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TB 126 METRO GOLD LINE CONSTRUCTION PHASE”
If the tunnelatmosphere is determined to be non-compromised, the first-in company may enter the tunnel to assist with patient care as long as they comply with the SCBA and self-rescue device requirements.
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TB 126 METRO GOLD LINE CONSTRUCTION PHASE”
Staging reports to Operations and will operate above ground in close proximity to the Portal opening.
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TB 126 METRO GOLD LINE CONSTRUCTION PHASE”
Tunnel Division will ensure that all emergency operations are discontinued and the tunnel evacuated should the tunnel atmosphere meet or exceed 20% Lower Explosive Limit (LEL).
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