CES Communication & Documentation 3 — Questions and Answers
Question 1: A shot report for a quarry blast should include the specific gravity of the rock being blasted primarily because it affects which calculation?
- Powder factor and energy requirements (Correct answer)
- Transportation weight limits
- ATF license renewal timing
- Number of warning signals required
Correct answer: Powder factor and energy requirements
Rock specific gravity directly influences powder factor calculations and the amount of explosive energy needed to fragment the material.
Question 2: In a seismograph report following a blast, the value most directly used to evaluate potential structural damage to nearby buildings is:
- Frequency in Hz
- Peak particle velocity (PPV) (Correct answer)
- Air overpressure in psi
- Scaled distance
Correct answer: Peak particle velocity (PPV)
Peak particle velocity (PPV) is the standard measurement used to assess ground vibration impact on structures according to USBM RI 8507.
Question 3: A certified explosives specialist discovers a discrepancy between the quantity of explosive received and the quantity recorded in the magazine inventory. The first required action is to:
- Immediately destroy the excess material
- Notify the ATF in writing within 24 hours
- Conduct an internal count and document the discrepancy (Correct answer)
- Contact the supplier for a replacement shipment
Correct answer: Conduct an internal count and document the discrepancy
Before any reporting or action, the specialist must conduct a recount and document the discrepancy to establish the accurate facts.
Question 4: Which document serves as the primary legal authorization allowing a licensed explosives user to transport explosives on public roads?
- The blaster's license
- The DOT hazmat transportation permit (Correct answer)
- The ATF user permit
- The magazine storage license
Correct answer: The DOT hazmat transportation permit
DOT hazmat transportation regulations govern the movement of explosives on public roads, and carriers must comply with DOT placarding and permit requirements.
Question 5: When documenting a blast hole pattern in a blaster's log, which measurement is MOST important for post-blast analysis of fragmentation results?
- The color of the drill cuttings
- Burden and spacing dimensions (Correct answer)
- The brand of drill bit used
- The time the drilling crew arrived on site
Correct answer: Burden and spacing dimensions
Burden and spacing dimensions directly control fragmentation and are the primary variables analyzed to optimize future blast designs.
Question 6: A blaster must communicate an emergency stop to the firing crew. According to standard industry protocol, the universal warning signal is:
- Three long blasts on an air horn
- A series of short, rapid horn blasts (Correct answer)
- One long and two short radio transmissions
- A red flag raised at the blast site
Correct answer: A series of short, rapid horn blasts
A series of short, rapid blasts on a horn or siren is the universally recognized emergency stop or danger signal at blast sites.
Question 7: Environmental compliance documentation for a surface mine blast must typically include monitoring data for which two primary concerns?
- Water temperature and soil pH
- Ground vibration and air overpressure (Correct answer)
- Dust particle size and humidity
- Equipment noise and light pollution
Correct answer: Ground vibration and air overpressure
Ground vibration (PPV) and air overpressure are the two primary environmental parameters monitored and documented for regulatory compliance in surface blasting.
CES Communication & Documentation 3
A shot report for a quarry blast should include the specific gravity of the rock being blasted primarily because it affects which calculation?