CEA Risk Management & Environmental Impact 4 — Questions and Answers
Question 1: Which term describes the process by which contaminants accumulate in an organism at concentrations higher than in its surrounding environment?
- Biomagnification
- Bioaccumulation (Correct answer)
- Biotransformation
- Bioremediation
Correct answer: Bioaccumulation
Bioaccumulation refers to the net accumulation of a contaminant in an organism's tissues to levels exceeding those in the ambient environment.
Question 2: A risk auditor evaluating a dry-cleaning facility is most concerned about which chemical as a groundwater contaminant due to its persistence and carcinogenicity?
- Toluene
- Tetrachloroethylene (PCE) (Correct answer)
- Benzene
- Methylene chloride
Correct answer: Tetrachloroethylene (PCE)
Tetrachloroethylene (PCE/PERC) is the primary dry-cleaning solvent and a persistent chlorinated VOC that is classified as a likely human carcinogen by EPA.
Question 3: In environmental auditing, what does 'due diligence' primarily refer to in the context of property transactions?
- Obtaining all required environmental permits before property transfer
- Investigating potential environmental liabilities before acquiring property (Correct answer)
- Ensuring that environmental insurance is in place at closing
- Filing a CERCLA innocent landowner defense claim
Correct answer: Investigating potential environmental liabilities before acquiring property
Due diligence involves conducting Phase I and Phase II Environmental Site Assessments to identify recognized environmental conditions before a property changes hands.
Question 4: Which exposure pathway is typically the DOMINANT route of concern for children living near contaminated soil sites?
- Inhalation of indoor air vapors
- Dermal contact with contaminated groundwater
- Incidental ingestion of contaminated soil (Correct answer)
- Consumption of contaminated fish
Correct answer: Incidental ingestion of contaminated soil
Children's hand-to-mouth behavior and time spent in contact with soil make incidental soil ingestion the primary exposure pathway in residential risk assessments for this population.
Question 5: Which document produced during the CERCLA remedial process formally selects the cleanup remedy for a Superfund site?
- Remedial Investigation (RI) Report
- Feasibility Study (FS)
- Record of Decision (ROD) (Correct answer)
- Engineering Evaluation/Cost Analysis (EE/CA)
Correct answer: Record of Decision (ROD)
The Record of Decision (ROD) is the EPA's formal, public decision document that selects the preferred remedy based on the RI/FS findings.
Question 6: An industrial facility's stack emissions are monitored under a Title V permit. Which parameter is used to calculate the mass emission rate of a pollutant?
- Ambient air quality concentration at the fence line
- Stack gas volumetric flow rate multiplied by pollutant concentration (Correct answer)
- Permit emission limit divided by operating hours
- Monitoring well concentration times groundwater flux
Correct answer: Stack gas volumetric flow rate multiplied by pollutant concentration
Mass emission rate (e.g., lb/hr) is calculated by multiplying the measured stack gas flow rate (volume/time) by the measured pollutant concentration.
Question 7: Which risk management framework developed by EPA integrates problem formulation, analysis, and risk characterization for ecosystems?
- Risk Management Program (RMP) Framework
- Ecological Risk Assessment Framework (ERA) (Correct answer)
- Integrated Risk Information System (IRIS)
- Superfund Health Risk Technical Support Center Guidelines
Correct answer: Ecological Risk Assessment Framework (ERA)
EPA's Ecological Risk Assessment Framework (1998) provides the three-phase process—problem formulation, analysis, and risk characterization—for evaluating risks to non-human receptors.
CEA Risk Management & Environmental Impact 4
Which term describes the process by which contaminants accumulate in an organism at concentrations higher than in its surrounding environment?