S-130 Mop-Up Operations 2 — Questions and Answers
Question 1: What is the purpose of a grid search pattern during mop-up operations?
- To survey the area for wildlife before work begins
- To systematically cover every part of the assigned mop-up area without missing hotspots (Correct answer)
- To map the perimeter of the burned area for reporting
- To establish escape routes through the burned zone
Correct answer: To systematically cover every part of the assigned mop-up area without missing hotspots
A grid search ensures complete, systematic coverage of the mop-up area so that no hidden hotspots are overlooked by firefighters working in overlapping lanes.
Question 2: How should a burning root system be treated during mop-up?
- Leave it to burn out naturally since it is below ground
- Trace and expose the root, then apply water and mix with soil until cool (Correct answer)
- Cover it with dirt to smother it without disturbing the root
- Flag it and move on — it is handled by follow-up crews only
Correct answer: Trace and expose the root, then apply water and mix with soil until cool
Burning roots must be traced, exposed, and treated with water mixed into the soil to ensure the entire smoldering path is extinguished.
Question 3: What is the recommended minimum depth for mop-up into the soil to extinguish subsurface burning?
- 1 inch
- 2 inches
- 4 to 6 inches into mineral soil (Correct answer)
- 12 inches
Correct answer: 4 to 6 inches into mineral soil
Mop-up should typically reach 4 to 6 inches into mineral soil to ensure smoldering duff, roots, and organic material below the surface are fully extinguished.
Question 4: What is the purpose of patrol operations after mop-up is declared complete?
- To collect tools and equipment left in the burned area
- To monitor previously mopped-up areas for re-ignition (Correct answer)
- To document the fire's origin for investigation
- To scout new fireline construction routes
Correct answer: To monitor previously mopped-up areas for re-ignition
Patrol after mop-up ensures that previously extinguished areas have not re-ignited due to wind, hidden hotspots, or subsurface fire that escaped initial treatment.
Question 5: When approaching a burning stump during mop-up, what is the correct treatment procedure?
- Dig out the stump and remove it from the burned area
- Treat the exterior only with water since the interior will self-extinguish
- Bore holes into or break apart the stump, apply water, and mix until cool to the touch (Correct answer)
- Flag it as a hazard and report to the supervisor
Correct answer: Bore holes into or break apart the stump, apply water, and mix until cool to the touch
Stumps often hold interior burning embers; boring or breaking them apart exposes the smoldering core so water and mixing can fully extinguish the heat.
Question 6: During mop-up near a hazardous snag that cannot be safely felled, what is the first action a firefighter should take?
- Ignore it and continue mop-up on the opposite side of the unit
- Establish escape routes and a safety zone before working nearby (Correct answer)
- Tie the snag to adjacent trees to stabilize it
- Apply water to the base to cool it before continuing
Correct answer: Establish escape routes and a safety zone before working nearby
Before working near any hazardous snag, firefighters must first identify and establish clear escape routes and a safety zone in case the snag falls unexpectedly.
Question 7: Which S-130 principle applies when a firefighter discovers an unextinguished hotspot in an area already certified as mopped up?
- Leave it for the next shift since it is outside their assigned area
- Report it immediately to the supervisor and treat it (Correct answer)
- Mark it with flagging and continue to the next section
- Only treat it if there is visible flame
Correct answer: Report it immediately to the supervisor and treat it
Any discovered hotspot must be immediately reported to the supervisor and treated, because even small unextinguished embers can cause the fire to re-establish.
S-130 Mop-Up Operations 2
What is the purpose of a grid search pattern during mop-up operations?