ABC ABC Regulatory Compliance and Safety 2

Question 1

What is the required minimum free chlorine residual in a water distribution system under most US state regulations?

Accepted Answer

0.2 mg/L

Answer

Most states require a minimum free chlorine residual of 0.2 mg/L at any point in the distribution system to prevent microbial regrowth.

Question 2

What type of hazard is represented by confined spaces in water treatment facilities?

Accepted Answer

Permit-required confined space hazard

Answer

Tanks, vaults, and manholes at water facilities are typically permit-required confined spaces due to hazards like oxygen deficiency and toxic atmospheres.

Question 3

Under the Lead and Copper Rule, action must be taken if lead levels exceed the action level at what percentage of tap samples?

Accepted Answer

10%

Answer

If lead exceeds 15 ppb at more than 10% of tap water samples (90th percentile), the system must take action under the Lead and Copper Rule.

Question 4

What is the primary purpose of the Consumer Confidence Report (CCR) that water systems must issue annually?

Accepted Answer

Inform customers about water quality and sources

Answer

The CCR is an annual water quality report that community water systems must deliver to customers, detailing source water and contaminant levels.

Question 5

Which personal protective equipment is mandatory when handling gaseous chlorine at a water treatment plant?

Accepted Answer

Self-contained breathing apparatus (SCBA)

Answer

SCBA is required when working with or near gaseous chlorine because it is a toxic gas that can be fatal even at low concentrations.

(ABC) Association of Boards of Certification Practice Test

(ABC) Association of Boards of Certification Practice Test

ABC ABC Regulatory Compliance and Safety 2