1234001 Flashcards
(15 cards)
The turbidity leaving a slow sand filter must be:
A. ≤ 5 ntu in 95% of the measurements collected each month
B. < 1.0 ntu in 95% of the measurements collected each month
C. ≤ 1.0 ntu in 95% of the measurements collected each monthYou should have checked this.
D. < 0.5 ntu in 95% of the measurements collected each monthYou shouldn’t have checked this.
C. ≤ 1.0 ntu in 95% of the measurements collected each monthYou should have checked this.
Water systems avoiding filtration of source water must show that the turbidity of the source water immediately before the initial point of disinfection has not exceeded _____ NTU in 90% of the samples analyzed in the previous 6 months.
A. 0.5
B. 0.3
C. 1.0
D. 5.0
D. 5.0
A public water system serving a population greater than 3,300 must not have a disinfectant residual entering the distribution system below _____ for more than 4 hours.
A. 0.2 mg/L
B. 0.3 mg/L
C. 0.4 mg/L
D. 0.1 mg/L
A. 0.2 mg/L
What percent of total coliform samples can be positive and the system remain in compliance if they collect 40 or more samples each month?
A. 5%
B. 2%
C. 4%
D. 3%
A. 5%
How often must sodium samples be collected by public water systems using surface water in whole or in part?
A. Monthly
B. Quarterly
C. Annually
D. At least every three years
C. Annually
Which is the maximum residual disinfection level goal for chlorine?
A. 3 mg/L
B. 5 mg/L
C. 8 mg/L
D. 4 mg/L
D. 4 mg/L
What are the required turbidity sampling points in a community water system?
A. Customer’s kitchen sink
B. All points where water enters the distribution system, including all filter effluents if surface water is used
C. Representative points within the distribution system
D. Only where it enters the system
B. All points where water enters the distribution system, including all filter effluents if surface water is used
When is it permissible for a water supplier to not report analytical results to the state?
A. When the samples have been invalidated by the laboratory manager
B. When all constituents analyzed are not detectable
C. When all constituents analyzed are below the MCLs
D. When a state run laboratory performs the analyses
D. When a state run laboratory performs the analyses
How large must the sample be for lead and copper analyses?
A. 250 mL
B. 500 mL
C. 1,000 mL
D. 100 mL
C. 1,000 mL
What are the turbidity requirements for diatomaceous earth filtration?
A. ≤0.5 ntu in 95% of the measurements collected each month
B. <0.5 ntu in 95% of the measurements collected each month
C. <5.0 ntu in 95% of the measurements collected each month
D. ≤1.0 ntu in 95% of the measurements collected each month
D. ≤1.0 ntu in 95% of the measurements collected each month
A nitrate sample can be held for_____ days before analysis if the sample is chlorinated and not acidified.
A. 14
B. 7
C. 180
D. 28
A. 14
For water systems that collect inorganic samples more frequently than annually, compliance with the MCL is determined by:
A. an average of all samples at any sampling point
B. a running annual average at each sampling point
C. individual samples each time at every sampling point
D. an average of the last two samples at any sampling point
B. a running annual average at each sampling point
Who certifies water treatment plant laboratories for the measurement of total coliforms, fecal coliforms, and heterotrophic plate counts?
A. AWWA
B. ASTM International or NSF International
C. American Standard Testing Methodology
D. USEPA or the State
D. USEPA or the State
Which type of violation requires an all clear notification to the public?
A. Tier II
B. Tier I
C. Tier III
D. Tier IV
B. Tier I
