Question 2014 of 236 · California Water Treatment Operator Exam
Which turbidity limit applies to combined filter effluent from a conventional or direct filtration plant under the Surface Water Treatment Rule?
Exactly one answer is correct.
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Correct answer to question 2014
- C: Not more than 0.3 NTU in 95 percent of monthly measurements, and never above 1 NTU
Explanation
Under the Surface Water Treatment Rules, combined filter effluent from conventional and direct filtration must be 0.3 NTU or less in at least 95 percent of monthly measurements, and no sample may exceed 1 NTU (40 CFR 141.173(a)). California 22 CCR 64653 has the same 0.3 NTU 95 percent limit and adds time-based 1 NTU conditions (for example, not above 1 NTU for more than one continuous hour at systems serving 10,000 or more).
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