CWEA Collections Grade 2 Practice Test Questions and
Answers () (Verified Answers)
Why are gasoline and volatile solvents objectionable when present in a sewer? - ANSWER-They
produce an explosion hazard
You should never attempt to install, troubleshoot, maintain, repair, or replace electrical equipment
unless: - ANSWER-You know what you are doing, are qualified, and are authorized.
How many different areas of traffic zones are there when working in roadways? - ANSWER-Five
Why should hydrogen sulfide be controlled? - ANSWER-To protect sewers and structures from
corrosion
Personnel entering a Permit Required Confined Space must have the following training: - ANSWER-
Entry and rescue procedures
To find proper protective gear before application of a product, you would: - ANSWER-Look at the
MSDS (Material Safety Data Sheet)
The gas most commonly associated with septic wastewater is: - ANSWER-Hydrogen Sulfide (H2S)
The lack of an unpleasant odor in a structure does not always mean that dangerous gases are not
present because: - ANSWER-Some dangerous gases have no odor
What four conditions are necessary to create an explosion? - ANSWER-Combustible gas, adequate
oxygen, sufficient heat, and proper mixing of gas and oxygen.
What does "transition area" mean in traffic control? - ANSWER-Moves traffic out of its normal path
The term "transition area" is one component of a: - ANSWER-Traffic Control Zone
What elements should be considered to improve worker safety in High Speed Temporary Traffic
Control Zones? - ANSWER-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? -
ANSWER-Traffic control plan, by-pass connections, and spill containment.
"Spring Blades" are a type of tool used with: - ANSWER-Power Rodder
Porcupine, Root Saw, and a Square Bar Cork Screw are all tools used for: - ANSWER-Sewer rodding
What tool would you use to cut VCP pipe? - ANSWER-Chain pipe cutter
Which conditions should a gas detection device test for? - ANSWER-Hydrogen Sulfide,
explosive/flammable gases, oxygen.
What does "LEL" mean on a gas detection meter? - ANSWER-Lower explosive limit
The oxygen level alarm in a gas detection meter is normally set to go off at oxygen levels below: -
ANSWER-19.5%
, When developing an S.O.P. for scheduled maintenance of electrical equipment, what program should
be addressed as a primary safety guideline? - ANSWER-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? - ANSWER-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: - ANSWER-Permit Required Confined Space
According to a State Water Resources Control Board order, each Enrollee must develop and
implement a system-specific: - ANSWER-Sewer System Management Plan (SSMP)
Category 1 SSO's that discharge to a drainage channel and/or surface water must be reported within:
- ANSWER-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: - ANSWER-the GPS coordinates
Biological activity in long, sluggish-flow, flat grade sewer lines will likely cause odors, true or false? -
ANSWER-True
Flatter sewer line grades may cause added sewer maintenance expense and odor nuisance. The
problem is most likely caused by: - ANSWER-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? - ANSWER-True
What is the first thing to consider when selecting a solution to clear a stoppage in a sewer? -
ANSWER-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? - ANSWER-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? - ANSWER-True
The main reason for adding sodium hypochlorite to sewers is to control: - ANSWER-Odor
Roots can enter collection systems through pipe cracks, true or false? - ANSWER-True
The lowest point on the inside of a pipeline is called the: - ANSWER-Invert
How often must an excavation site and adjacent areas be inspected for hazardous conditions? -
ANSWER-Daily
Working in an un-sloped trench with no shoring is one option of Protective Shoring Systems, true or
false? - ANSWER-False. Some options are proper stopping or benching of the sides of the excavation,
supporting the sides of a trench with shoring, and using a shield in the excavation area.
Answers () (Verified Answers)
Why are gasoline and volatile solvents objectionable when present in a sewer? - ANSWER-They
produce an explosion hazard
You should never attempt to install, troubleshoot, maintain, repair, or replace electrical equipment
unless: - ANSWER-You know what you are doing, are qualified, and are authorized.
How many different areas of traffic zones are there when working in roadways? - ANSWER-Five
Why should hydrogen sulfide be controlled? - ANSWER-To protect sewers and structures from
corrosion
Personnel entering a Permit Required Confined Space must have the following training: - ANSWER-
Entry and rescue procedures
To find proper protective gear before application of a product, you would: - ANSWER-Look at the
MSDS (Material Safety Data Sheet)
The gas most commonly associated with septic wastewater is: - ANSWER-Hydrogen Sulfide (H2S)
The lack of an unpleasant odor in a structure does not always mean that dangerous gases are not
present because: - ANSWER-Some dangerous gases have no odor
What four conditions are necessary to create an explosion? - ANSWER-Combustible gas, adequate
oxygen, sufficient heat, and proper mixing of gas and oxygen.
What does "transition area" mean in traffic control? - ANSWER-Moves traffic out of its normal path
The term "transition area" is one component of a: - ANSWER-Traffic Control Zone
What elements should be considered to improve worker safety in High Speed Temporary Traffic
Control Zones? - ANSWER-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? -
ANSWER-Traffic control plan, by-pass connections, and spill containment.
"Spring Blades" are a type of tool used with: - ANSWER-Power Rodder
Porcupine, Root Saw, and a Square Bar Cork Screw are all tools used for: - ANSWER-Sewer rodding
What tool would you use to cut VCP pipe? - ANSWER-Chain pipe cutter
Which conditions should a gas detection device test for? - ANSWER-Hydrogen Sulfide,
explosive/flammable gases, oxygen.
What does "LEL" mean on a gas detection meter? - ANSWER-Lower explosive limit
The oxygen level alarm in a gas detection meter is normally set to go off at oxygen levels below: -
ANSWER-19.5%
, When developing an S.O.P. for scheduled maintenance of electrical equipment, what program should
be addressed as a primary safety guideline? - ANSWER-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? - ANSWER-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: - ANSWER-Permit Required Confined Space
According to a State Water Resources Control Board order, each Enrollee must develop and
implement a system-specific: - ANSWER-Sewer System Management Plan (SSMP)
Category 1 SSO's that discharge to a drainage channel and/or surface water must be reported within:
- ANSWER-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: - ANSWER-the GPS coordinates
Biological activity in long, sluggish-flow, flat grade sewer lines will likely cause odors, true or false? -
ANSWER-True
Flatter sewer line grades may cause added sewer maintenance expense and odor nuisance. The
problem is most likely caused by: - ANSWER-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? - ANSWER-True
What is the first thing to consider when selecting a solution to clear a stoppage in a sewer? -
ANSWER-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? - ANSWER-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? - ANSWER-True
The main reason for adding sodium hypochlorite to sewers is to control: - ANSWER-Odor
Roots can enter collection systems through pipe cracks, true or false? - ANSWER-True
The lowest point on the inside of a pipeline is called the: - ANSWER-Invert
How often must an excavation site and adjacent areas be inspected for hazardous conditions? -
ANSWER-Daily
Working in an un-sloped trench with no shoring is one option of Protective Shoring Systems, true or
false? - ANSWER-False. Some options are proper stopping or benching of the sides of the excavation,
supporting the sides of a trench with shoring, and using a shield in the excavation area.
