Comprehensive ADEQ Grade 4 Water Treatment & Exam Questions and Answers with Verified Solutions | Latest Update

Comprehensive ADEQ Grade 4 Water Treatment & Exam
Questions and Answers with Verified Solutions | Latest Update


QUESTION
Safe Drinking Water Act (SDWA)

Answer:
Federal law regulating drinking water.

QUESTION
Maximum Contaminant Levels (MCLs)

Answer:
Regulatory limits on the amount of specific contaminants allowed in drinking water.

QUESTION
Turbidity

Answer:
d 0.3 NTU in 95% of samples, never above 1 NTU.

QUESTION
Total Coliform Rule

Answer:
0 positive coliforms in routine distribution samples.

QUESTION
Lead & Copper Rule

Answer:
Lead action level = 0.015 mg/L, Copper = 1.3 mg/L.

QUESTION
Nitrate MCL

Answer:
10 mg/L as N.

QUESTION
Arsenic MCL

Answer:
0.010 mg/L.

, QUESTION
Monitoring/Reporting

Answer:
Operators are legally responsible for proper sampling and reporting.

QUESTION
Chlorine

Answer:
Forms: gas, sodium hypochlorite, calcium hypochlorite.

QUESTION
Chlorine demand

Answer:
Applied dose - Residual.

QUESTION
Free chlorine residual

Answer:
HOCl + OCl .

QUESTION
Combined chlorine residual

Answer:
Chloramines.

QUESTION
Breakpoint chlorination

Answer:
Point where adding more chlorine produces a free chlorine residual.

QUESTION
CT Concept

Answer:
C = disinfectant residual (mg/L), T = contact time (min), CT = C × T. Used to verify Giardia,
virus, and crypto inactivation.