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CWEA COLLECTIONS GRADE 2
PRACTICE TEST QUESTIONS AND
ANSWERS 2026
Flatter sewer line grades may cause added sewer maintenance expense and odor
nuisance. The problem is most likely caused by: - correct-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? - correct-answer - True
What is the first thing to consider when selecting a solution to clear a stoppage in
a sewer? - correct-answer - Cause of stoppage
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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? - correct-
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? - correct-answer - True
The main reason for adding sodium hypochlorite to sewers is to control: -
correct-answer - Odor
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Roots can enter collection systems through pipe cracks, true or false? - correct-
answer - True
The lowest point on the inside of a pipeline is called the: - correct-answer -
Invert
How often must an excavation site and adjacent areas be inspected for hazardous
conditions? - correct-answer - Daily
Working in an un-sloped trench with no shoring is one option of Protective
Shoring Systems, true or false? - correct-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.
CWEA COLLECTIONS GRADE 2
PRACTICE TEST QUESTIONS AND
ANSWERS 2026
Flatter sewer line grades may cause added sewer maintenance expense and odor
nuisance. The problem is most likely caused by: - correct-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? - correct-answer - True
What is the first thing to consider when selecting a solution to clear a stoppage in
a sewer? - correct-answer - Cause of stoppage
,2|Page
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? - correct-
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? - correct-answer - True
The main reason for adding sodium hypochlorite to sewers is to control: -
correct-answer - Odor
, 3|Page
Roots can enter collection systems through pipe cracks, true or false? - correct-
answer - True
The lowest point on the inside of a pipeline is called the: - correct-answer -
Invert
How often must an excavation site and adjacent areas be inspected for hazardous
conditions? - correct-answer - Daily
Working in an un-sloped trench with no shoring is one option of Protective
Shoring Systems, true or false? - correct-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.
