Question 4014 of 229 · California Water Distribution Operator Exam
How is a standard lead and copper tap sample collected?
Exactly one answer is correct.
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Correct answer to question 4014
- B: A 1-liter first-draw sample after at least 6 hours of stagnation
Explanation
First-draw water that has stood in the plumbing shows the metals that dissolved from it. Flushing first would hide the problem.
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