Environmental Compliance Inspector Inspection and Sampling Procedures 2 — Questions and Answers
Question 1: When collecting a composite wastewater sample over a 24-hour period, what is the primary advantage over grab sampling?
- It requires less laboratory analysis time
- It captures variability in discharge concentrations throughout the day (Correct answer)
- It is less expensive to collect
- It eliminates the need for chain-of-custody documentation
Correct answer: It captures variability in discharge concentrations throughout the day
Composite samples capture fluctuations in pollutant concentrations over time, providing a more representative average of the discharge.
Question 2: An inspector notices that a facility's storm drain outfall flows to a nearby wetland. Under the Clean Water Act, this discharge most likely requires what type of permit?
- A Resource Conservation and Recovery Act (RCRA) permit
- A National Pollutant Discharge Elimination System (NPDES) permit (Correct answer)
- A Safe Drinking Water Act Underground Injection Control permit
- A TSCA section 5 pre-manufacture notice
Correct answer: A National Pollutant Discharge Elimination System (NPDES) permit
Any point source discharge of pollutants to waters of the United States, including wetlands, requires an NPDES permit under the Clean Water Act.
Question 3: During a hazardous waste inspection, you find drums labeled 'Used Solvent Mixture' with no generator ID. What is the FIRST action you should take?
- Immediately arrange for emergency removal of the drums
- Document the condition with photographs and note it in your inspection report (Correct answer)
- Contact the state fire marshal
- Order the facility to stop all operations
Correct answer: Document the condition with photographs and note it in your inspection report
Inspectors must document findings thoroughly before taking enforcement action, ensuring an accurate record that supports any subsequent legal proceedings.
Question 4: A soil sample collected for VOC analysis must be preserved using which method to prevent analyte loss?
- Refrigeration at 4°C with no headspace in a sealed vial (Correct answer)
- Air drying the soil before placing it in a plastic bag
- Adding sodium thiosulfate and storing at room temperature
- Freezing the sample at -20°C in an open container
Correct answer: Refrigeration at 4°C with no headspace in a sealed vial
VOCs are volatile and must be stored with no headspace in a sealed vial and kept at 4°C to minimize volatilization losses prior to analysis.
Question 5: Which document accompanies a hazardous waste shipment from generator to disposal facility and must be retained for at least three years?
- Inspection Activity Report
- Uniform Hazardous Waste Manifest (Correct answer)
- Toxic Release Inventory Form R
- Spill Prevention Control and Countermeasure Plan
Correct answer: Uniform Hazardous Waste Manifest
The Uniform Hazardous Waste Manifest tracks hazardous waste from cradle to grave and must be retained by generators, transporters, and treatment/disposal facilities.
Question 6: An inspector finds a facility discharging process water with a pH of 3.5 to the municipal sewer. This likely violates which type of regulation?
- Air quality pretreatment standards
- Industrial pretreatment program limits (Correct answer)
- Stormwater general permit conditions
- Underground storage tank release detection requirements
Correct answer: Industrial pretreatment program limits
Industrial pretreatment programs set limits on pollutants discharged to publicly owned treatment works (POTWs), typically requiring pH between 5.0 and 9.5.
Question 7: What is the purpose of a field blank in environmental sampling?
- To calibrate the field instruments before sampling begins
- To detect contamination introduced by sampling equipment or the environment during collection (Correct answer)
- To establish the background concentration in the source water
- To verify the laboratory's analytical detection limits
Correct answer: To detect contamination introduced by sampling equipment or the environment during collection
A field blank is clean water processed through the same collection equipment and exposed to the same conditions as samples, revealing contamination from the field environment or equipment.
Environmental Compliance Inspector Inspection and Sampling Procedures 2
When collecting a composite wastewater sample over a 24-hour period, what is the primary advantage over grab sampling?