S-130 Mop-Up Operations 1 — Questions and Answers
Question 1: What is the primary goal of mop-up operations in wildland firefighting?
- Increase the speed of the fireline construction
- Extinguish all heat and embers within a specified distance of the control line (Correct answer)
- Conduct reconnaissance for the next operational period
- Remove all vegetation from the burned area
Correct answer: Extinguish all heat and embers within a specified distance of the control line
Mop-up ensures that all heat, embers, and burning material within a specified distance of the control line are fully extinguished to prevent re-ignition.
Question 2: What technique involves firefighters feeling the ground with the bare hand or fingers to detect hidden heat during mop-up?
- Grid searching
- Cold-trailing (Correct answer)
- Depth probing
- Scratch lining
Correct answer: Cold-trailing
Cold-trailing is the technique of using a bare hand or fingers close to — but not touching — the soil surface to detect residual heat that may not be visible.
Question 3: When rolling a smoldering log during mop-up, in which direction should it be rolled?
- Toward the firefighter to keep it in the burned area
- Uphill to prevent rolling away
- Away from the firefighter and away from unburned fuel (Correct answer)
- Parallel to the slope to keep it stationary
Correct answer: Away from the firefighter and away from unburned fuel
Rolling a smoldering log away from the firefighter and away from unburned fuel prevents injury from rolling embers and reduces the risk of igniting unburned material.
Question 4: Why is mixing soil with water an effective mop-up technique?
- It creates a slippery barrier that blocks fire spread
- It cools the soil faster and the mud retains moisture to prevent re-ignition (Correct answer)
- It marks areas that have been treated
- It improves footing for firefighters on the fireline
Correct answer: It cools the soil faster and the mud retains moisture to prevent re-ignition
Mixing soil and water creates a mud slurry that cools hotspots faster and maintains moisture in the soil, preventing re-ignition of smoldering material.
Question 5: What is a 'sleeper' in the context of wildland fire mop-up?
- A firefighter taking a mandatory rest period on the fireline
- A fire burning underground through roots, duff, or peat that re-surfaces after mop-up (Correct answer)
- A smoldering snag that falls overnight
- An undetected spot fire beyond the control line
Correct answer: A fire burning underground through roots, duff, or peat that re-surfaces after mop-up
A sleeper is a subsurface fire that travels through root systems, duff, or organic soil and re-emerges after an area has been declared mopped up.
Question 6: What condition must be met before mop-up of an area is considered complete?
- All snags within 300 feet must be felled
- No smoke, heat, or embers remain within the specified mop-up distance from the control line (Correct answer)
- All ash has been buried to a depth of 12 inches
- Water has been applied to every square foot of the burned area
Correct answer: No smoke, heat, or embers remain within the specified mop-up distance from the control line
Mop-up is complete only when there is no detectable smoke, heat, or ember within the distance specified by the Incident Commander from the control line.
Question 7: Why are standing dead trees (snags) considered especially hazardous during mop-up operations?
- They block radio communication on the fireline
- They may fall without warning due to burned root systems and weakened wood (Correct answer)
- They create shadows that hide hotspots from aerial observation
- They absorb water intended for mop-up
Correct answer: They may fall without warning due to burned root systems and weakened wood
Snags can fall unpredictably because fire damages their root systems and structurally weakens the wood, making them a constant overhead hazard during mop-up.
S-130 Mop-Up Operations 1
What is the primary goal of mop-up operations in wildland firefighting?