Question 1010 of 223 · California Water Treatment Operator Exam
What is the purpose of the sanitary seal (annular seal) around a well casing?
Exactly one answer is correct.
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Correct answer to question 1010
- A: To prevent surface water and contaminants from moving down the outside of the casing
Explanation
The annular seal, usually cement grout or bentonite, fills the space between the casing and borehole wall. It blocks a direct path for contamination to reach the aquifer.
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