Question 2026 of 229 · California Water Distribution Operator Exam
Which action should be done when a storage tank is drained for cleaning?
Exactly one answer is correct.
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Correct answer to question 2026
- D: Isolate it, ventilate and test the air, and disinfect it before returning to service
Explanation
A drained tank is a confined space and must be disinfected per AWWA C652 and sampled before use. Atmospheric testing and a rescue plan are required for entry.
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