CLASS 4 WASTEWATER IL EXAM VIRGINIA
WITH COMPLETE SOLUTIONS GRADED A+
QUESTIONS AND ANSWERS
What do you do if a sewer line is plugged? ANSWER - Look for a manhole with
reduced or no flow when the manhole upstream is flowing full
The first action taken when discovering gasoline when you open a manhole is?
ANSWER - Call the police and fire departments
When do you wear splash goggles? ANSWER - When pouring chemicals
When is the DO the highest in stabilization ponds? ANSWER - Mid-afternoon
When do you do if a stabalization pond is going "septic"? ANSWER - Raise the level
(the oxygen level is raised by the additional water volume)
An operators license is subject to? ANSWER - Revocation, fine and imprisonment
How long are BOD tests incubated for? ANSWER - 5 days at 20* celcius
When do operators raise lagoon levels? ANSWER - Fall
When do operators lower lagoon levels? ANSWER - Spring
, Where should you dig for a sewer line? ANSWER - 18 inches above where it is
shown on the pans
Corrosion in manholes is caused by? ANSWER - hygrogen sulfide gas
What should you check before entering a manhole? ANSWER - lower explosive
limits both before and after
How is TSS measured? ANSWER - filtering though a gooch crucible
What is the greatest task for intermittent sand filters? ANSWER - cleaning of the
sand
An automatic vent fan that runs during the time the door is open is considered?
ANSWER - ventilation in a lift station
Trickling filter treatment does not follow? ANSWER - Lagoons
What is heavier chlorine or air? ANSWER - Chlorine
In an intermittent sand filter what is the top 1-3 inches of sand? ANSWER - The
portion replaced during normal operation
With ponds or lagoons the term "freeboard" refers to? ANSWER - The working area
remaining above the water surface
WITH COMPLETE SOLUTIONS GRADED A+
QUESTIONS AND ANSWERS
What do you do if a sewer line is plugged? ANSWER - Look for a manhole with
reduced or no flow when the manhole upstream is flowing full
The first action taken when discovering gasoline when you open a manhole is?
ANSWER - Call the police and fire departments
When do you wear splash goggles? ANSWER - When pouring chemicals
When is the DO the highest in stabilization ponds? ANSWER - Mid-afternoon
When do you do if a stabalization pond is going "septic"? ANSWER - Raise the level
(the oxygen level is raised by the additional water volume)
An operators license is subject to? ANSWER - Revocation, fine and imprisonment
How long are BOD tests incubated for? ANSWER - 5 days at 20* celcius
When do operators raise lagoon levels? ANSWER - Fall
When do operators lower lagoon levels? ANSWER - Spring
, Where should you dig for a sewer line? ANSWER - 18 inches above where it is
shown on the pans
Corrosion in manholes is caused by? ANSWER - hygrogen sulfide gas
What should you check before entering a manhole? ANSWER - lower explosive
limits both before and after
How is TSS measured? ANSWER - filtering though a gooch crucible
What is the greatest task for intermittent sand filters? ANSWER - cleaning of the
sand
An automatic vent fan that runs during the time the door is open is considered?
ANSWER - ventilation in a lift station
Trickling filter treatment does not follow? ANSWER - Lagoons
What is heavier chlorine or air? ANSWER - Chlorine
In an intermittent sand filter what is the top 1-3 inches of sand? ANSWER - The
portion replaced during normal operation
With ponds or lagoons the term "freeboard" refers to? ANSWER - The working area
remaining above the water surface
