UTILITY EMERGENCIES

Question 1

What is Vapor Density?

Answer 1

Vapor density refers to the relative weight of a gas or vapor compared to air, which has an
arbitrary value of 1

Question 2

Personnel should not take what into potentially explosive atmosphere?

Answer 2

should not take radios, pagers, cell phones, flashlights, and other equipment not safe

Question 3

when arriving on scene for a gas utility emergency, personnel should position
apparatus

Answer 3

prior to and upwind of the hazard area

Question 4

Drivers should avoid parking
their vehicles over what?

Answer 4

sewers, valve covers, and manhole covers because the collection of gases in
these locations could present a potential hazard to first responders.

Question 5

If personnel detect the odor of mercaptan when arriving on scene, they should

Answer 5

move their apparatus
to an area without odor.

Question 6

First-arriving units should position ______ ft or further from the incident location

Answer 6

100 ft

Question 7

The first-arriving engine company’s unit officer should communicate a water supply report to?

Answer 7

second due engine company

Question 8

H2S—also known as

Answer 8

sewer gas due to its distinct odor—is colorless and smells like
rotten eggs.

Question 9

H2S can be found in many

Answer 9

confined spaces, including manholes, drainage pipes, and basements

Question 10

H2S
It becomes flammable at___
and is toxic at___

Answer 10

4%
and
100ppm

Question 11

During the size-up, unit officers should complete a ________ of the structure

Answer 11

360-degree lap

Question 12

To determine fresh air
values and accurately monitor atmospheric concentrations, personnel must ___________before
entering the hot zone.

Answer 12

bump-test AMDs

Question 13

Personnel should avoid performing fresh air calibration inside ________ as off-gassing
personal protective equipment (PPE) or a minor exhaust leak could alter what the monitor
establishes as fresh air.

Answer 13

fire apparatus

Question 14

Personnel should cautiously approach the affected building from ?

Answer 14

the corners

Question 15

In cases where the fire department has been called to an inside gas leak with nothing found, the
source of the odor might be a ?

Answer 15

dry J-, P-, or S-trap in a drain?

Question 16

LEL operational action levels are as follows:

____%: Investigate the area in full PPE

_______%: Continue to investigate utilizing SCBA

_______% or greater: Evacuate, secure utility from the structure’s exterior, and perform exterior
natural ventilation

Answer 16

0–10%
: Investigate the area in full PPE

10–25%: Continue to investigate utilizing SCBA

25% or greater: Evacuate

Question 17

When personnel cannot control a gas leak at an appliance or meter, they may have to locate the

Answer 17

gas
curb valve that regulates the building’s gas service.

Question 18

If personnel accidentally turn off a gas street valve, they should?

Answer 18

should not turn it back on

Question 19

When controlling the gas, water, or electricity in a specific area or at a specific appliance, the
OIC should?

Answer 19

recommend a licensed or certified technician who can restore the area

Question 20

Personnel should confirm
___________ have been controlled before beginning ventilation operations

Answer 20

ignition sources

Question 21

During gas utility emergencies, gas concentrations higher than ____% of the LEL and CO levels
greater than _______ppm indicate an IDLH

Answer 21

10% of the LEL

CO levels
greater than 1,200 ppm

Question 22

Personnel assigned to RECON operations should dress in _______?

Answer 22

in full
structural PPE with SCBA.

Question 23

When atmospheric monitoring indicates an IDLH environment, ICs should establish?

Answer 23

operational
hot and cold zones

Question 24

Members should use a ___________ and ________to protect
personnel working in the hot zone

Answer 24

hoseline and dry chemical extinguisher

Question 25

While investigating inside natural gas leaks, personnel should focus on________________________and____because the vapor density of natural gas is less than 1, so it will rise

Answer 25

the upper stories, attics, and cocklofts

Question 26

Structures where propane services the major household appliances, personnel should focus on?

Answer 26

basements and crawlspaces because propane is heavier than air and will sink to lower areas of a structure

Question 27

If gas company personnel have arrived on an incident scene before fire crews, the first-arriving unit should?

Answer 27

contact the on-scene gas company and determine needs.

Question 28

Personnel encountering an odor covering an area inside a facility with or without inside gas appliances should?

Answer 28

assign a resource to check the rooftop for any odors from the HVAC units or rooftop service lines.

Question 29

minimum initial alarm assignment for an inside gas leak

Answer 29

2 Engines 1 Truck or Rescue 1 EMS unit 1 BC

Question 30

first due engine company’s responsibilities (Inside Gas Leaks)

Answer 30

Identify hydrant (not w/in 300 ft of incident Position the first engine at the hydrant while maintaining the ability to forward lay Communicate an on-scene report Announce FDC connection if it has sprinklers or standpipe Complete 360 Investigate or perform RECON

Question 31

Investigating personnel should be equipped with what equipment?

Answer 31

a dry chemical extinguisher and an AMD

Question 32

second due engine company’s responsibilities (Inside Gas Leaks)

Answer 32

Fulfill the primary water supply plan as directed by the first engine Await report of investigative findings from the first engine Assist the first engine as directed. Prepare to deploy an initial or second hoseline as needed.

Question 33

first due truck or rescue company’s responsibilities (Inside Gas Leaks)

Answer 33

Position a minimum of 300 ft from the incident Await report of investigative findings from the first engine Assist the first engine as directed.

Question 34

When personnel determine that a structure fire is gas-fed, members must?

Answer 34

notify Command of the situation and submit a request for the gas to be shut down

Question 35

When an incident involves a vehicle crashing into a building, personnel should thoroughly check?

Answer 35

the building for damaged gas lines.