SC Water And Sewer Lines Practice Questions - South Carolina Water And Sewer Lines Contractor Examination Exam

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When the AWWA C651 tablet method is used to disinfect a new ductile-iron main that can be kept clean and dry, what average chlorine dose and minimum contact time does DIPRA describe?

10 mg/L for 3 hours Approximately 25 mg/L, with water left in the pipe at least 24 hours (48 hours if the water is colder than 41°F) 100 mg/L held for 15 minutes No contact time if the tablets are attached with food-grade adhesive

Correct Answer:

Approximately 25 mg/L, with water left in the pipe at least 24 hours (48 hours if the water is colder than 41°F)

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