CWEA Collections Grade 2 Practice Test With Correct
Answers
Why are gasoline and volatile solvents objectionable when present in a sewer?
They produce an explosion hazard
You should never attempt to install, troubleshoot, maintain, repair, or replace
electrical equipment unless:
You know what you are doing, are qualified, and are authorized.
How many different areas of traffic zones are there when working in roadways?
Five
Why should hydrogen sulfide be controlled?
To protect sewers and structures from corrosion
Personnel entering a Permit Required Confined Space must have the following
training:
Entry and rescue procedures
To find proper protective gear before application of a product, you would:
Look at the MSDS (Material Safety Data Sheet)
The gas most commonly associated with septic wastewater is:
Hydrogen Sulfide (H2S)
The lack of an unpleasant odor in a structure does not always mean that
dangerous gases are not present because:
Some dangerous gases have no odor
What four conditions are necessary to create an explosion?
Combustible gas, adequate oxygen, sufficient heat, and proper mixing of gas and
oxygen.
What does "transition area" mean in traffic control?
Moves traffic out of its normal path
The term "transition area" is one component of a:
Traffic Control Zone
What elements should be considered to improve worker safety in High Speed
Temporary Traffic Control Zones?
Rerouting traffic around the work site, positioning of law enforcement officers in the
temporary traffic control zone, and work zone training.
What key factors would you need to address when developing an S.O.P. for Lift
Station failure?
Traffic control plan, by-pass connections, and spill containment.
"Spring Blades" are a type of tool used with:
Power Rodder
Porcupine, Root Saw, and a Square Bar Cork Screw are all tools used for:
Sewer rodding
What tool would you use to cut VCP pipe?
Chain pipe cutter
Which conditions should a gas detection device test for?
Hydrogen Sulfide, explosive/flammable gases, oxygen.
What does "LEL" mean on a gas detection meter?
, Lower explosive limit
The oxygen level alarm in a gas detection meter is normally set to go off at
oxygen levels below:
19.5%
When developing an S.O.P. for scheduled maintenance of electrical equipment,
what program should be addressed as a primary safety guideline?
The L.O.T.O. (Lock Out Tag Out) Program
What document would you require to be referenced when developing an S.O.P.
for hazardous substance spill cleanup as well as spill containment?
M.S.D.S.
Placement of the Blower and P.P.E. are two things you would include in
developing an S.O.P. for air monitoring in a:
Permit Required Confined Space
According to a State Water Resources Control Board order, each Enrollee must
develop and implement a system-specific:
Sewer System Management Plan (SSMP)
Category 1 SSO's that discharge to a drainage channel and/or surface water must
be reported within:
2 hours
To report in the Statewide SSO Data-base California Integrated Water Quality
System (CIWQS), regarding the location of a Category 2 SSO, you must know:
the GPS coordinates
Biological activity in long, sluggish-flow, flat grade sewer lines will likely cause
odors, true or false?
True
Flatter sewer line grades may cause added sewer maintenance expense and odor
nuisance. The problem is most likely caused by:
A decrease in velocity allowing organic and inorganic solids to settle out
Infiltration from a high water table can be one source of excessive clear water in a
collection system, true or false?
True
What is the first thing to consider when selecting a solution to clear a stoppage in
a sewer?
Cause of stoppage
The interior of 300 feet of 12-inch pipe is uniformly coated with one inch of
grease. How many gallons will this pipe hold when filled with water?
12 inches (diameter of pipe) - 2 inches (grease on pipe) = 10 inches
Convert inches to feet:
10 inches x (1 foot / 12 inches) = 0.833 feet
Volume of a right regular cylinder:
V = 0.785 x Diameter x Diameter x Length of Pipe
V = 0.785 x 0.833 ft x 0.833 ft x 300 ft
V = 163.41 cubic feet
Convert to Gallons:
163.41 cu ft x (7.48 gal / 1 cu ft) = 1223.31 gal
Infiltration can be caused by cracked pipes, true or false?
Answers
Why are gasoline and volatile solvents objectionable when present in a sewer?
They produce an explosion hazard
You should never attempt to install, troubleshoot, maintain, repair, or replace
electrical equipment unless:
You know what you are doing, are qualified, and are authorized.
How many different areas of traffic zones are there when working in roadways?
Five
Why should hydrogen sulfide be controlled?
To protect sewers and structures from corrosion
Personnel entering a Permit Required Confined Space must have the following
training:
Entry and rescue procedures
To find proper protective gear before application of a product, you would:
Look at the MSDS (Material Safety Data Sheet)
The gas most commonly associated with septic wastewater is:
Hydrogen Sulfide (H2S)
The lack of an unpleasant odor in a structure does not always mean that
dangerous gases are not present because:
Some dangerous gases have no odor
What four conditions are necessary to create an explosion?
Combustible gas, adequate oxygen, sufficient heat, and proper mixing of gas and
oxygen.
What does "transition area" mean in traffic control?
Moves traffic out of its normal path
The term "transition area" is one component of a:
Traffic Control Zone
What elements should be considered to improve worker safety in High Speed
Temporary Traffic Control Zones?
Rerouting traffic around the work site, positioning of law enforcement officers in the
temporary traffic control zone, and work zone training.
What key factors would you need to address when developing an S.O.P. for Lift
Station failure?
Traffic control plan, by-pass connections, and spill containment.
"Spring Blades" are a type of tool used with:
Power Rodder
Porcupine, Root Saw, and a Square Bar Cork Screw are all tools used for:
Sewer rodding
What tool would you use to cut VCP pipe?
Chain pipe cutter
Which conditions should a gas detection device test for?
Hydrogen Sulfide, explosive/flammable gases, oxygen.
What does "LEL" mean on a gas detection meter?
, Lower explosive limit
The oxygen level alarm in a gas detection meter is normally set to go off at
oxygen levels below:
19.5%
When developing an S.O.P. for scheduled maintenance of electrical equipment,
what program should be addressed as a primary safety guideline?
The L.O.T.O. (Lock Out Tag Out) Program
What document would you require to be referenced when developing an S.O.P.
for hazardous substance spill cleanup as well as spill containment?
M.S.D.S.
Placement of the Blower and P.P.E. are two things you would include in
developing an S.O.P. for air monitoring in a:
Permit Required Confined Space
According to a State Water Resources Control Board order, each Enrollee must
develop and implement a system-specific:
Sewer System Management Plan (SSMP)
Category 1 SSO's that discharge to a drainage channel and/or surface water must
be reported within:
2 hours
To report in the Statewide SSO Data-base California Integrated Water Quality
System (CIWQS), regarding the location of a Category 2 SSO, you must know:
the GPS coordinates
Biological activity in long, sluggish-flow, flat grade sewer lines will likely cause
odors, true or false?
True
Flatter sewer line grades may cause added sewer maintenance expense and odor
nuisance. The problem is most likely caused by:
A decrease in velocity allowing organic and inorganic solids to settle out
Infiltration from a high water table can be one source of excessive clear water in a
collection system, true or false?
True
What is the first thing to consider when selecting a solution to clear a stoppage in
a sewer?
Cause of stoppage
The interior of 300 feet of 12-inch pipe is uniformly coated with one inch of
grease. How many gallons will this pipe hold when filled with water?
12 inches (diameter of pipe) - 2 inches (grease on pipe) = 10 inches
Convert inches to feet:
10 inches x (1 foot / 12 inches) = 0.833 feet
Volume of a right regular cylinder:
V = 0.785 x Diameter x Diameter x Length of Pipe
V = 0.785 x 0.833 ft x 0.833 ft x 300 ft
V = 163.41 cubic feet
Convert to Gallons:
163.41 cu ft x (7.48 gal / 1 cu ft) = 1223.31 gal
Infiltration can be caused by cracked pipes, true or false?
