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Environmental Assessment & Sampling Techniques Flashcards

7 cards from real CEA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Environmental Assessment & Sampling Techniques flashcards as text

  1. An environmental auditor observes staining beneath a floor drain in a manufacturing facility. What is the most appropriate immediate documentation step?

    Answer: Photograph, measure, and describe the staining in the field logbook with GPS coordinates

    Proper field documentation of staining through photographs, measurements, and written descriptions preserves the observation as evidence before any corrective action or regulatory notification.

  2. Which statistical method is most appropriate for determining whether contaminant concentrations at a site are significantly elevated above natural background?

    Answer: 95% Upper Confidence Limit (UCL95) of the site mean vs. background threshold

    The 95% UCL of the mean accounts for sample variability and data distribution, providing a statistically defensible comparison of site concentrations to background or regulatory thresholds per EPA guidance.

  3. A soil boring log indicates a lithologic change from fine sand to clay at 12 feet bgs. What is the hydrogeologic significance of this clay layer for contaminant migration?

    Answer: Clay serves as a confining layer that can retard downward contaminant migration

    Clay layers have very low hydraulic conductivity and act as aquitards or confining layers that can significantly retard downward vertical migration of contaminants through the unsaturated zone.

  4. Under 40 CFR Part 261, which characteristic makes a solid waste a RCRA hazardous waste based on laboratory testing?

    Answer: The waste exhibits ignitability, corrosivity, reactivity, or toxicity (TCLP)

    RCRA characteristic hazardous wastes are defined by four characteristics: ignitability (D001), corrosivity (D002), reactivity (D003), and toxicity as determined by TCLP (D004-D043).

  5. When designing a groundwater monitoring network at a landfill, how should monitoring wells be positioned relative to groundwater flow?

    Answer: At least one upgradient background well and multiple downgradient compliance wells

    RCRA Subtitle D and Subtitle C monitoring networks require upgradient background wells to establish baseline and downgradient compliance wells to detect releases in the direction of groundwater flow.

  6. A site conceptual model (CSM) is an essential component of environmental investigations. What does a CSM primarily define?

    Answer: The contaminant sources, release mechanisms, exposure pathways, and receptors

    A Conceptual Site Model defines the source-pathway-receptor linkages including contaminant sources, release mechanisms, migration pathways, exposure routes, and potential receptors to guide investigation and risk assessment.

  7. Which approach is used to convert contaminant concentrations measured in soil to an estimated cancer risk for a residential receptor under EPA's risk assessment framework?

    Answer: Applying exposure factors and slope factors via the risk equation: Risk = CDI × CSF

    EPA's baseline risk assessment calculates incremental lifetime cancer risk by multiplying the Chronic Daily Intake (CDI) by the Cancer Slope Factor (CSF) using pathway-specific exposure factors.