CWEA Grade 1 Exam with Accurate
Solutions
What does the term inflow refer to in a wastewater collection system? - ANSWER-Water
discharged into a collection system and service connections from sources other than
regular connections
What is one cause of an ineffective maintenance program? - ANSWER-Airtight joint
Which items are sources of pressure on the financial resources of a wasterwater
collection system agency? - ANSWER-Reduction of a federal, state, and local funds
What problem can occur when velocities in a collection system are too high or too low?
- ANSWER-The velocities can interfere with the operation and maintenance of the
system
What are lateral and branch sewers? - ANSWER-Sewers that serve the upper ends of
the street sewer components of a collection system
Wetted perimeter - ANSWER-The length of the wetted portion of a pipe covered by
flowing wastewater.
Nominal Diameter - ANSWER-An approximate measurement of the diameter of a pipe.
Although the nominal diameter is used to describe the size or diameter of a pipe, it is
usually not the exact inside diameter of the pipe.
Annular - ANSWER-A ring shaped space located between two circular objects
Competent person - ANSWER-A person who is capable of identifying existing and
predictable hazards in the surroundings or working conditions which are unsanitary,
hazardous, or dangerous to employees, and who has authorization to take prompt
corrective measures to eliminate them.
IDLH - ANSWER-Immediately Dangerous to Life or Health
Confined space - ANSWER-A work area large enough for a person to work, but
arranged in such a way that an employee must physically enter the space to perform
work. A confined space has a limited or restricted means of entry and exit. It is not
designed for continuous work.
, Anaerobic - ANSWER-A condition in which oxygen is not present
Mercaptan - ANSWER-Compounds containing sulfur that have a skunk like odor
Olfactory fatigue - ANSWER-A condition in which a person's nose, after exposure to
certain odors, is no longer able to detect the odor.
Lockout/Tagout (LOTO) - ANSWER-The practice and procedures necessary to disable
machinery or equipment.
Time Weighted Average (TWA) - ANSWER-Used to calculate a worker's daily exposure
to a hazardous substance averaged to an 8 hour day.
SDS - ANSWER-Safety Data Sheet-provides comprehensive information about a
substance for use in the workplace.
Smoke Test - ANSWER-A method of blowing smoke into a closed off section of a sewer
system to locate sources of surface inflow
Which pipe inspection technology uses sound waves to detect blockages in collection
system pipes? - ANSWER-Acoustic transmitters
What is an advantage of an electro scanning operation? - ANSWER-The ability to
repeat data inspection results
What types of illegal taps might be revealed during a television inspection of a collection
system conducted to search for unrecorded connections? - ANSWER-Industrial,
stormwater, or surface drainage
At what set point do CCTV camera footage readings usually start? - ANSWER-At the
same set point, the center of the manhole
During CCTV inspections of active sewer lines, what must be recorded? - ANSWER-
Defects
Water table - ANSWER-The upper level of the saturated zone of groundwater
Surcharge - ANSWER-When the supply of water to be carried is greater than the
capacity of the pipes to carry the flow
Subsidence - ANSWER-The lowering of the ground surface as a result of excess water
GIS - ANSWER-Geographic Information System, A computer system that stores,
organizes, analyzes, and displays geographic data, including utilities.
Solutions
What does the term inflow refer to in a wastewater collection system? - ANSWER-Water
discharged into a collection system and service connections from sources other than
regular connections
What is one cause of an ineffective maintenance program? - ANSWER-Airtight joint
Which items are sources of pressure on the financial resources of a wasterwater
collection system agency? - ANSWER-Reduction of a federal, state, and local funds
What problem can occur when velocities in a collection system are too high or too low?
- ANSWER-The velocities can interfere with the operation and maintenance of the
system
What are lateral and branch sewers? - ANSWER-Sewers that serve the upper ends of
the street sewer components of a collection system
Wetted perimeter - ANSWER-The length of the wetted portion of a pipe covered by
flowing wastewater.
Nominal Diameter - ANSWER-An approximate measurement of the diameter of a pipe.
Although the nominal diameter is used to describe the size or diameter of a pipe, it is
usually not the exact inside diameter of the pipe.
Annular - ANSWER-A ring shaped space located between two circular objects
Competent person - ANSWER-A person who is capable of identifying existing and
predictable hazards in the surroundings or working conditions which are unsanitary,
hazardous, or dangerous to employees, and who has authorization to take prompt
corrective measures to eliminate them.
IDLH - ANSWER-Immediately Dangerous to Life or Health
Confined space - ANSWER-A work area large enough for a person to work, but
arranged in such a way that an employee must physically enter the space to perform
work. A confined space has a limited or restricted means of entry and exit. It is not
designed for continuous work.
, Anaerobic - ANSWER-A condition in which oxygen is not present
Mercaptan - ANSWER-Compounds containing sulfur that have a skunk like odor
Olfactory fatigue - ANSWER-A condition in which a person's nose, after exposure to
certain odors, is no longer able to detect the odor.
Lockout/Tagout (LOTO) - ANSWER-The practice and procedures necessary to disable
machinery or equipment.
Time Weighted Average (TWA) - ANSWER-Used to calculate a worker's daily exposure
to a hazardous substance averaged to an 8 hour day.
SDS - ANSWER-Safety Data Sheet-provides comprehensive information about a
substance for use in the workplace.
Smoke Test - ANSWER-A method of blowing smoke into a closed off section of a sewer
system to locate sources of surface inflow
Which pipe inspection technology uses sound waves to detect blockages in collection
system pipes? - ANSWER-Acoustic transmitters
What is an advantage of an electro scanning operation? - ANSWER-The ability to
repeat data inspection results
What types of illegal taps might be revealed during a television inspection of a collection
system conducted to search for unrecorded connections? - ANSWER-Industrial,
stormwater, or surface drainage
At what set point do CCTV camera footage readings usually start? - ANSWER-At the
same set point, the center of the manhole
During CCTV inspections of active sewer lines, what must be recorded? - ANSWER-
Defects
Water table - ANSWER-The upper level of the saturated zone of groundwater
Surcharge - ANSWER-When the supply of water to be carried is greater than the
capacity of the pipes to carry the flow
Subsidence - ANSWER-The lowering of the ground surface as a result of excess water
GIS - ANSWER-Geographic Information System, A computer system that stores,
organizes, analyzes, and displays geographic data, including utilities.
