Class C Water Operator License Exam verified A+

Class C Water Operator License Exam verified A+ Ammonia mixed with chlorine gas creates a - white smoke The most difficult part of a water distribution operator's job. - furnish a continuous supply Physical connection between a safe and potentially unsafe water source. - cross connection A distribution system is a - looped system Dead end mains should be flushed - every month Excess nitrate causes a condition called - blue baby syndrome Water hardness is caused by - calcium and magnesium Sewer mains should be __ft away from water mains. - 9 Water with a pH less than 7 is considered to be - acidic Bacti records are kept for ____yrs and chemical records are kept for ___yrs. - 5, 10 Bacti samples have to be returned to the lab within ___hrs of the collection time. - 30 Color in the water supply should be less than _____ units. - 15 Chlorine is ______ times heavier than air. - 2.5 90% of underground pipe failures are related to improper - backfill and bedding The spoil bank should be located at least ___ft away from the ditch. - 2 The following minimum residuals is ______mg/L for free chlorine and ____mg/L for total chlorine. - .2, .5 Public opinion of the water utility is _______ at a standstill. - never A bacti sample should be taken every ____ft of pipe. - 1000 The most common collection point for a bacti sample is the water tap _______. - outside the house