CWEA COLLECTIONS GRADE 3 EXAM NEWEST 2024-

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CWEA COLLECTIONS GRADE 3 EXAM NEWEST 2024-

2025 ACTUAL EXAM COMPLETE 80 QUESTIONS AND

CORRECT DETAILED ANSWERS (VERIFIED

ANSWERS) |ALREADY GRADED A+

Hydrogen peroxide controls odors in sewers by:

• decreasing the dissolved oxygen.
• neutralizing the PH.
• oxidizing sulfide compounds.
• providing a source of hydrogen ions. - ANSWER- c. oxidizing sulfide

compounds.

Construction of a wastewater pipeline under a highway or railway without disrupting the traffic is done by?

• Drag lining.
• Dredging.
• Embankment excavation.
• Boring and jacking. - ANSWER- d. Boring and jacking.

When a grade conflict exists between a water main and a sewer main, which of the following is the best solution? 1 / 3

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• Build a manhole around the sewer main and continue the water main

through the manhole.

• Drop the sewer service under the water main and let it work like a

siphon.

• Have the water main adjusted and hold the grade on the sewer main.
• Raise the sewer over the water main and install a sewer pump station.
• ANSWER- c. Have the water main adjusted and hold the grade on the

sewer main.

The reason newly constructed collection system sewers should be

inspected is to:

• determine if the contractor has complied with plans and specifications.
• determine if smoke tests will be successful.
• determine if dye tests will be successful.
• determine if the streets are paved. - ANSWER- a. determine if the

contractor has complied with plans and specifications.

A source of infiltration in a collection system is:

• new pipes.
• proper joint pipes.
• pipe liners
• broken pipe joints - ANSWER- d. broken pipe joints

What are the advantages of a video tape recording system?

• Cheaper than a Polaroid camera. 2 / 3

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• Record and play private video tapes.
• The ability to see what's happening when the camera is underwater. d.

The length and severity of defective areas that can be recorded for later study. - ANSWER- d. The length and severity of defective areas that can be recorded for later study.

Before conducting smoke testing you should:

• warn the public after smoke testing is completed.
• notify local police and fire departments only if a fire is started.
• notify local animal control departments in advance of testing.
• notify public, local police, and fire departments in advance of testing.
• ANSWER- d. notify public, local police, and fire departments in

advance of testing.

Manholes are installed in sewer lines for the access of:

• backflow devices.
• personnel and materials
• traffic control devices.
• survey equipment. - ANSWER- b. personnel and materials

Anaerobic wastewater is frequently corrosive to materials it contacts,

especially:

• coal tar enamel.
• concrete.
• stainless Steel.
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