Question 1030 of 229 · California Water Distribution Operator Exam
Under 22 CCR 64580, what must be true of the bacteriological samples from a new water main before it is placed into service?
Exactly one answer is correct.
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Correct answer to question 1030
- B: They must be negative for coliform bacteria
Explanation
22 CCR 64580 requires new mains to be disinfected and sampled in accordance with AWWA C651-05, and samples from new mains must be negative for coliform bacteria before the main goes into service.
More questions: Disinfection
- 1031Which AWWA standard does 22 CCR 64582 require for disinfecting and bacteriological sampling of a distribution reservoir that was taken out of service for repair or inspection?
- 1001Why is a new or repaired water main disinfected before it is placed in service?
- 1002Under the AWWA C651 continuous-feed method, what is the minimum chlorine concentration in the new main at the start of the contact period?
- 1003Under the AWWA C651 slug method, which dose and contact time apply?
- 1004After the 24-hour contact period of the continuous-feed method, what free chlorine residual must remain in the main?
- 1005Why should a new main be flushed before the disinfectant is added?