Air Emission Monitoring & Control 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 Air Emission Monitoring & Control flashcards as text
Under 40 CFR Part 75, which facilities are required to use Continuous Emission Monitoring Systems (CEMS)?
Answer: Electric utility steam generating units subject to the Acid Rain Program
40 CFR Part 75 specifically requires CEMS for electric utility steam generating units regulated under the Acid Rain Program (Title IV of the CAA).
What is the primary purpose of a Relative Accuracy Test Audit (RATA) for a CEMS?
Answer: To compare CEMS data against reference method measurements to verify accuracy
A RATA compares CEMS measurements with simultaneous reference method (stack test) measurements to verify that the CEMS accurately reflects actual emissions.
Which EPA method is the reference method for measuring particulate matter emissions from stationary sources?
Answer: EPA Method 5
EPA Method 5 is the reference method for determining particulate matter emissions from stationary sources using an isokinetic sampling train.
A stack test result shows SO2 emissions of 1.8 lb/MMBtu against a permit limit of 1.5 lb/MMBtu. What is the compliance status?
Answer: Out of compliance, because measured emissions exceed the permit limit
Measured SO2 emissions of 1.8 lb/MMBtu exceed the permit limit of 1.5 lb/MMBtu, placing the facility in noncompliance regardless of the margin.
What does the term 'isokinetic sampling' mean in the context of stack emissions testing?
Answer: Sampling at a rate equal to the stack gas velocity to avoid biasing particle collection
Isokinetic sampling means the sampling rate matches the stack gas velocity so that particles enter the probe in proportion to their actual concentration, avoiding size-biased errors.
Which air pollutant is regulated as a 'hazardous air pollutant' (HAP) under Section 112 of the Clean Air Act rather than as a criteria pollutant?
Answer: Benzene
Benzene is listed as a hazardous air pollutant under CAA Section 112 and regulated under National Emission Standards for Hazardous Air Pollutants (NESHAP), not as a criteria pollutant.
What is the purpose of a Cylinder Gas Audit (CGA) in CEMS quality assurance?
Answer: To challenge the CEMS analyzer with a certified reference gas to check linearity
A CGA introduces a certified reference gas cylinder into the CEMS to verify that the analyzer responds accurately at a concentration different from the zero/span calibration points.