Basic Knowledge
An air gap can be used to?
Prevent backflow of wastewater into a drinking water supply.
A wastewater lift station is designed to?
Lift wastewater
A bell of a pipe that is chipped during installation should not be used because it may cause?
-Infiltration
-Exfiltration
-Root Intrusion
Operator should never enter a manhole without?
-Other person on site
-gas testing equipment
Ideal pipe bedding material?
Gravel
A cross-connection is a?
Potable water pipe connected to a supply of questionable origin.
Manhole covers are normally heavy because?
-Prevent vandalism
-Safety
-Support traffic
Roots may temporarily be removed from sewers by the use of?
Power Rodders/Jetting
H2s smells like?
rotten eggs
Sewer pipe joints are sealed together with?
O-ring/Gasket
A pig would be used to _____ in a force main?
Clean/ream
A bubbler tube would most likely be found in?
Wet well
What type of main would you use a pig to clean?
Force Main
Manhole steps should never be?
Trusted
3 types of pipe material are?
-Concrete
-PVC
-Orangburg
What is the minimum scouring velocity in sewers?
2ft/sec
Corrosion of metals in lift stations can be controlled by using?
Sacrificial metals
H2S would be most likely found in what conditions?
Slow moving, anaerobic lines.
What location in a room does a chlorine detector draw its sample from?
Angle of repose is?
Natural slope of soil
What does I & I refer to?
Infiltration & inflow
Manholes are normally located at?
-Change in direction
-Change in grade
-Change in pipe size
The part of the pipe that is most vulnerable to corrosion from septic wastewater is?
Crown
Chlorine gas is what color?
Yellowish-green
How far should spoil piles be from an open trench?
2ft