Question 1002 of 229 · California Water Distribution Operator Exam
Under the AWWA C651 continuous-feed method, what is the minimum chlorine concentration in the new main at the start of the contact period?
Exactly one answer is correct.
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Correct answer to question 1002
- C: 25 mg/L
Explanation
Continuous feed uses water at 25 mg/L or more that stays in the main for 24 hours. The 100 mg/L figure belongs to the slug method, and 10 mg/L is the residual that must remain after 24 hours.
More questions: Disinfection
- 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?
- 1006Heavily chlorinated water flushed from a main must be dechlorinated before it reaches a storm drain or creek. Which chemical is commonly used?
- 1007Approximately what percentage of available chlorine does calcium hypochlorite (HTH) contain?
- 1008Which form of chlorine is 100 percent available chlorine?