Question 1009 of 223 · California Water Treatment Operator Exam
Which part of a drilled well prevents the walls of the borehole from collapsing and keeps surface contamination out of the aquifer?
Exactly one answer is correct.
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Correct answer to question 1009
- B: The casing
Explanation
The casing supports the borehole and, with the surface seal, blocks contaminants from entering along the hole. The screen is the slotted section that lets water in.
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