AWWA Quality Control Procedures 5

Question 1

Which statistical measure describes the spread or variability of replicate measurements around their mean?

Accepted Answer

Standard deviation

Answer

Standard deviation quantifies how much individual measurements deviate from the average, directly expressing measurement variability.

Question 2

The Consumer Confidence Report (CCR) must be delivered to customers by what date each year?

Accepted Answer

July 1

Answer

EPA requires community water systems to deliver annual CCRs to customers by July 1 covering the previous calendar year's water quality data.

Question 3

Which condition would most likely trigger an immediate Tier 1 public notification under EPA rules?

Accepted Answer

Detection of E. coli in the distribution system

Answer

E. coli detection represents an acute health risk, requiring Tier 1 notification within 24 hours to protect public health.

Question 4

What is the purpose of running a laboratory control sample (LCS) during water analysis?

Accepted Answer

To verify method performance using a known concentration in reagent water

Answer

An LCS uses reagent-grade water spiked at a known concentration to confirm that the analytical method is performing accurately, independent of sample matrix effects.

Question 5

When a water utility switches to a new disinfectant, which regulatory rule requires an updated disinfection byproduct monitoring plan?

Accepted Answer

Stage 2 Disinfectants and Disinfection Byproducts Rule

Answer

The Stage 2 D/DBP Rule requires locational running annual averages and site-specific monitoring plans that must be updated when treatment changes.

(AWWA) American Water Works Association Practice Test

(AWWA) American Water Works Association Practice Test

AWWA Quality Control Procedures 5