NM CID GF-9 Practice Questions - New Mexico CID GF-9 Utility Lines Contractor Examination Exam

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Under AWWA C651 tablet or continuous-feed disinfection of a new water main, the typical minimum initial free-chlorine concentration and contact time are:

10 mg/L for 1 hour 25 mg/L for 24 hours 100 mg/L for 10 minutes No chlorine if the hydrostatic test passed

Correct Answer:

25 mg/L for 24 hours

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