ABC WASTEWATER LEVEL 3 CERTIFICATION
EXAM QUESTIONS AND CORRECT
ANSWERS
Question 1
How many pounds of chlorine gas can be drawn from a 150 pound cylinder in a 24-
hour period at ordinary room temperature?
A. 20
B. 40
C. 60
D. 65
Correct Answer
B. 40
Question 2
Control is
A. backward looking
B. concentrating on the present
C. forward looking
D. not connected to the other managerial functions
Correct Answer
B. concentrating on the present
Question 3
The clarity of a trickling filter's effluent is considered good when the Secchi disk can
read at a level of
A. 1 ft
B. 2 ft
C. 3 ft
D. 4 ft
Correct Answer
C. 3 ft
Page 1 of 176
,Question 4
You have been directed to examine and review the plans and specifications for a new
wastewater pump station prior to the advertising for construction bids. Which of the
following is of least significance to your review?
A. the clearance around and above pumps, motors, valves and control switch gear
B. the provisions for ingress and egress for both wet well and dry well
C. the size and geometry of the wet well
D. the specific colors for all piping
Correct Answer
D. the specific colors for all piping
Question 5
The least desirable control method for an anaerobic digester is the use of digester
A. pH
B. CO₂
C. volatile-acid-to-alkalinity ratio
D. temperature
Correct Answer
A. pH
Question 6
Which one of the following provides a profile of hazardous substances or mixtures?
A. Occupational Safety and Health Administration (OSHA)
B. Comprehensive Environmental Response, Compensation, and Liability Act
(CERCLA)
C. Code of Federal Regulations (CFR)
D. material safety data sheet (MSDS)
Correct Answer
D. material safety data sheet (MSDS)
Page 2 of 176
,Question 7
If the sludge drying beds had a decaying organic odor, what would be the most likely
solution?
A. increase air in aeration system
B. improve operations before digester
C. improve housekeeping around drying beds
D. chemical addition with counter masking or masking agents
Correct Answer
D. chemical addition with counter masking or masking agents
Question 8
What class of fire involves sodium and magnesium?
A. Class A
B. Class B
C. Class C
D. Class D
Correct Answer
D. Class D
Question 9
Which chemical in the following list is the strongest disinfection?
A. chlorine
B. hypochlorous acid
C. hypochlorite ion
D. hydrochloric acid
Correct Answer
B. hypochlorous acid
Page 3 of 176
, Question 10
How many cubic meters per second in 10 MGD?
A. 0.44
B. 1.44
C. 4.73
D. 24.62
Correct Answer
A. 0.44
Question 11
If the ponds or lagoons had an ammonia odor, what would be the most likely
solution?
A. improve housekeeping around ponds and lagoons
B. remove sludge along sides of ponds or lagoons
C. add chemical treatment
D. add air or check diffusers in ponds or lagoons for proper function
Correct Answer
C. add chemical treatment
Question 12
In certain situations, a supervisor encourages the employees to make their own
decisions. This is considered to be
A. against the rules to follow past experiences in decision-making
B. bad form since the supervisor eventually loses control
C. highly desirable, since it encourages employee growth and frees the
D. supervisor for other tasks
E. passing the buck
Correct Answer
C. highly desirable, since it encourages employee growth
Page 4 of 176
EXAM QUESTIONS AND CORRECT
ANSWERS
Question 1
How many pounds of chlorine gas can be drawn from a 150 pound cylinder in a 24-
hour period at ordinary room temperature?
A. 20
B. 40
C. 60
D. 65
Correct Answer
B. 40
Question 2
Control is
A. backward looking
B. concentrating on the present
C. forward looking
D. not connected to the other managerial functions
Correct Answer
B. concentrating on the present
Question 3
The clarity of a trickling filter's effluent is considered good when the Secchi disk can
read at a level of
A. 1 ft
B. 2 ft
C. 3 ft
D. 4 ft
Correct Answer
C. 3 ft
Page 1 of 176
,Question 4
You have been directed to examine and review the plans and specifications for a new
wastewater pump station prior to the advertising for construction bids. Which of the
following is of least significance to your review?
A. the clearance around and above pumps, motors, valves and control switch gear
B. the provisions for ingress and egress for both wet well and dry well
C. the size and geometry of the wet well
D. the specific colors for all piping
Correct Answer
D. the specific colors for all piping
Question 5
The least desirable control method for an anaerobic digester is the use of digester
A. pH
B. CO₂
C. volatile-acid-to-alkalinity ratio
D. temperature
Correct Answer
A. pH
Question 6
Which one of the following provides a profile of hazardous substances or mixtures?
A. Occupational Safety and Health Administration (OSHA)
B. Comprehensive Environmental Response, Compensation, and Liability Act
(CERCLA)
C. Code of Federal Regulations (CFR)
D. material safety data sheet (MSDS)
Correct Answer
D. material safety data sheet (MSDS)
Page 2 of 176
,Question 7
If the sludge drying beds had a decaying organic odor, what would be the most likely
solution?
A. increase air in aeration system
B. improve operations before digester
C. improve housekeeping around drying beds
D. chemical addition with counter masking or masking agents
Correct Answer
D. chemical addition with counter masking or masking agents
Question 8
What class of fire involves sodium and magnesium?
A. Class A
B. Class B
C. Class C
D. Class D
Correct Answer
D. Class D
Question 9
Which chemical in the following list is the strongest disinfection?
A. chlorine
B. hypochlorous acid
C. hypochlorite ion
D. hydrochloric acid
Correct Answer
B. hypochlorous acid
Page 3 of 176
, Question 10
How many cubic meters per second in 10 MGD?
A. 0.44
B. 1.44
C. 4.73
D. 24.62
Correct Answer
A. 0.44
Question 11
If the ponds or lagoons had an ammonia odor, what would be the most likely
solution?
A. improve housekeeping around ponds and lagoons
B. remove sludge along sides of ponds or lagoons
C. add chemical treatment
D. add air or check diffusers in ponds or lagoons for proper function
Correct Answer
C. add chemical treatment
Question 12
In certain situations, a supervisor encourages the employees to make their own
decisions. This is considered to be
A. against the rules to follow past experiences in decision-making
B. bad form since the supervisor eventually loses control
C. highly desirable, since it encourages employee growth and frees the
D. supervisor for other tasks
E. passing the buck
Correct Answer
C. highly desirable, since it encourages employee growth
Page 4 of 176
