Epa Core Knowledge Epa Core Knowledge Environmental Monitoring & Sampling 1 — Questions and Answers
Question 1: What is the primary purpose of a chain of custody document in environmental sampling?
- To track sample integrity from collection to laboratory analysis (Correct answer)
- To record the cost of sampling equipment
- To list the names of field technicians
- To document weather conditions during sampling
Correct answer: To track sample integrity from collection to laboratory analysis
Chain of custody documents ensure that samples are tracked continuously from collection through laboratory analysis to maintain legal and scientific integrity.
Question 2: Which EPA method is commonly used for measuring volatile organic compounds (VOCs) in ambient air?
- Method TO-15 (Correct answer)
- Method 8270
- Method 624
- Method 200.8
Correct answer: Method TO-15
EPA Method TO-15 uses SUMMA canisters and GC/MS analysis to measure VOCs in ambient air samples.
Question 3: What does QA/QC stand for in the context of environmental monitoring?
- Quality Assurance/Quality Control (Correct answer)
- Quantitative Analysis/Qualitative Criteria
- Quick Assessment/Quality Check
- Quantified Averages/Quality Calibration
Correct answer: Quality Assurance/Quality Control
QA/QC stands for Quality Assurance/Quality Control, which are systematic processes to ensure data accuracy and reliability in environmental monitoring.
Question 4: What is a field blank used for in environmental sampling?
- To detect contamination introduced during sample collection and handling (Correct answer)
- To measure background radiation levels
- To calibrate field instruments
- To record ambient temperature at the sampling site
Correct answer: To detect contamination introduced during sample collection and handling
A field blank is a clean sample processed in the field to identify any contamination introduced during sample collection, handling, or transport.
Question 5: Which parameter must be measured immediately in the field when collecting water quality samples?
- Dissolved oxygen (Correct answer)
- Total dissolved solids
- Nitrate concentration
- Heavy metal content
Correct answer: Dissolved oxygen
Dissolved oxygen must be measured immediately in the field because it changes rapidly once a sample is removed from the water body.
Question 6: What is the Minimum Detection Limit (MDL) in environmental laboratory analysis?
- The lowest concentration of an analyte that can be detected with 99% confidence (Correct answer)
- The maximum allowable concentration of a pollutant
- The average concentration found in background samples
- The detection range of a field instrument
Correct answer: The lowest concentration of an analyte that can be detected with 99% confidence
The MDL is the lowest concentration of an analyte that can be detected and reported with 99% statistical confidence that it is distinguishable from zero.
Epa Core Knowledge Epa Core Knowledge Environmental Monitoring & Sampling 1
What is the primary purpose of a chain of custody document in environmental sampling?