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California CA QAL QAC Category M - Non-Soil Fumigation
Exam COMPLETE QUESTIONS AND DETAILED SOLUTIONS
LATEST UPDATE THIS YEAR-JUST RELEASED
SUMMARIZED EXAM COVERAGE
• Fumigant chemistry, behavior, and toxicity
• Structural and commodity fumigation methods
• Gas concentration, exposure time, and CT concepts
• PPE, safety protocols, and re-entry requirements
• Equipment use, calibration, and gas monitoring
• California pesticide laws and label compliance
• Sealing techniques and leak prevention
• Dosage calculations and environmental factors
Q1
A fumigator notices uneven gas distribution in a sealed warehouse during sulfuryl fluoride application;
what is the most likely cause?
A. Excessive ventilation improving airflow
B. Inadequate sealing allowing gas leakage
C. Overexposure to fumigant
D. Proper CT balance achieved
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Answer: B
Rationale: Gas leakage prevents uniform fumigant distribution.
Q2
During structural fumigation, monitoring shows declining fumigant concentration faster than expected;
what is the most likely issue?
A. Overdosage of fumigant
B. Leaks in structure sealing or poor tarp integrity
C. High humidity improving retention
D. Excess exposure time
Answer: B
Rationale: Gas loss indicates seal failure.
Q3
A technician applies sulfuryl fluoride but pests survive after correct exposure time; what is the most
likely cause?
A. Proper CT achieved
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B. Insufficient gas concentration due to leakage or underdosing
C. Excess fumigant applied
D. Proper aeration completed
Answer: B
Rationale: Inadequate lethal concentration reduces effectiveness.
Q4
During fumigation, temperature drops significantly inside the structure; what is the most likely effect on
fumigant performance?
A. Increased gas penetration
B. Reduced fumigant efficacy due to slower diffusion
C. Increased toxicity
D. No effect on fumigation
Answer: B
Rationale: Lower temperature slows fumigant activity.
Q5
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A fumigator detects phosphine odor near application site during treatment; what is the most likely
cause?
A. Normal application process
B. Gas leak or improper sealing of structure
C. Overexposure to monitoring equipment
D. Correct ventilation
Answer: B
Rationale: Phosphine odor indicates leakage and hazard.
Q6
A structural fumigation fails clearance testing due to residual gas presence; what is the most likely
cause?
A. Proper aeration
B. Incomplete ventilation or absorption in materials
C. Overheating structure
D. Excess sealing integrity
Answer: B
Rationale: Gas retention prevents safe clearance.
California CA QAL QAC Category M - Non-Soil Fumigation
Exam COMPLETE QUESTIONS AND DETAILED SOLUTIONS
LATEST UPDATE THIS YEAR-JUST RELEASED
SUMMARIZED EXAM COVERAGE
• Fumigant chemistry, behavior, and toxicity
• Structural and commodity fumigation methods
• Gas concentration, exposure time, and CT concepts
• PPE, safety protocols, and re-entry requirements
• Equipment use, calibration, and gas monitoring
• California pesticide laws and label compliance
• Sealing techniques and leak prevention
• Dosage calculations and environmental factors
Q1
A fumigator notices uneven gas distribution in a sealed warehouse during sulfuryl fluoride application;
what is the most likely cause?
A. Excessive ventilation improving airflow
B. Inadequate sealing allowing gas leakage
C. Overexposure to fumigant
D. Proper CT balance achieved
, Page 2 of 111
Answer: B
Rationale: Gas leakage prevents uniform fumigant distribution.
Q2
During structural fumigation, monitoring shows declining fumigant concentration faster than expected;
what is the most likely issue?
A. Overdosage of fumigant
B. Leaks in structure sealing or poor tarp integrity
C. High humidity improving retention
D. Excess exposure time
Answer: B
Rationale: Gas loss indicates seal failure.
Q3
A technician applies sulfuryl fluoride but pests survive after correct exposure time; what is the most
likely cause?
A. Proper CT achieved
, Page 3 of 111
B. Insufficient gas concentration due to leakage or underdosing
C. Excess fumigant applied
D. Proper aeration completed
Answer: B
Rationale: Inadequate lethal concentration reduces effectiveness.
Q4
During fumigation, temperature drops significantly inside the structure; what is the most likely effect on
fumigant performance?
A. Increased gas penetration
B. Reduced fumigant efficacy due to slower diffusion
C. Increased toxicity
D. No effect on fumigation
Answer: B
Rationale: Lower temperature slows fumigant activity.
Q5
, Page 4 of 111
A fumigator detects phosphine odor near application site during treatment; what is the most likely
cause?
A. Normal application process
B. Gas leak or improper sealing of structure
C. Overexposure to monitoring equipment
D. Correct ventilation
Answer: B
Rationale: Phosphine odor indicates leakage and hazard.
Q6
A structural fumigation fails clearance testing due to residual gas presence; what is the most likely
cause?
A. Proper aeration
B. Incomplete ventilation or absorption in materials
C. Overheating structure
D. Excess sealing integrity
Answer: B
Rationale: Gas retention prevents safe clearance.
