Level 2 · Intermediate sample questions
5 free sample questions on regulations and compliance for the Level 2 · Intermediate wastewater treatment operator exam. Try each one, then open the answer to check your work.
A plant is setting its minimum retention period for NPDES monitoring records. Under the general federal permit condition, which minimum applies unless the permit requires longer?
Answer: B. Keep records for at least 3 years
The general NPDES condition requires monitoring records to be retained for at least 3 years, with longer retention possible when required. A is shorter than the federal minimum, while C and D are longer periods rather than the stated general minimum. Source note: 40 CFR 122.41(j)(2).
An NPDES discharge report is ready 6 hr before the deadline. The preparer is not an authorized signatory. The authorized signer is off site, has remote access to the reporting portal, and offers to share login credentials so the on-site operator can submit. What should the plant do?
Answer: A. Have an authorized signer submit
With 6 hr remaining and remote access available, the authorized signer should use individual credentials to certify and submit the report. B shares another person's credentials, C omits certification, and D treats an unauthorized preparer as a signer without completing the authorization process.
An aeration blower tripped and was restarted during the night shift. Which operator-log entry gives the next shift the most useful record?
Answer: C. Record the time, alarm, observed condition, action taken, result, and operator initials.
A useful shift log records when the event happened, what was found, what was done, the result, and who made the entry. For example, the next operator can tell whether the blower stayed normal after restart. A lacks the trip details, B moves key operating facts out of the shift log, and D leaves out the condition and result.
An operator finishes a routine laboratory test. What belongs on the bench sheet so another person can trace the result?
Answer: D. Record sample ID, date and time, raw readings, units, calculations, QC results, and analyst initials.
A complete bench sheet links the sample and analyst to the raw observations, units, calculations, quality checks, and final result. For example, a reviewer can rebuild a dilution result from the written readings. A lacks sample details, B delays method control and omits raw data, and C postpones the raw record and leaves out sample identity and quality checks.
An operator confirms solids spilling over a secondary clarifier weir, and the condition may affect the plant discharge. What should the operator do?
Answer: A. Call the supervisor promptly, report the confirmed condition, and record the time and observations.
A confirmed condition that may affect discharge needs prompt supervisor notice and a clear operating record. For example, an early call lets the supervisor arrange added sampling or permit-required reporting while the operator keeps checking the clarifier. B delays the call for a full investigation, while C and D send or review records without timely notice to the responsible person.
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