CWEA COLLECTIONS SYSTEM

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CWEA COLLECTIONS SYSTEM

MAINTENANCE GRADE 3

ACTUAL EXAM WITH CORRECT

SOLUTIONS.

A Flagger should Stand?

• On the shoulder adjacent to traffic being controlled
• In the closed lane before stopping vehicle traffic
• In the traffic lane.
• As stated in "A" or "B" above. - correct answer- D. As stated

in "A" or "B" above.

Legally responsible officials are required to report category 1 sanitary sewer overflows?

• Within 30 days
• Before end of the day
• As soon as possible
• Within 2 hours - correct answer- D. Within 2 hours

When working in confined spaces or sewers, what form of lighting would you use?

• Mirrors to direct the sunlight or explosion proof lighting. 1 / 3

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• Ordinary electric lights
• Propane, Gas, or kerosene lanterns
• Special matches - correct answer- A. Mirrors to direct the

sunlight or explosion proof lighting.

What can happen if water-based substances are used to extinguish electrical fires?

• Nothing but extinguish the fire
• The fumes are not harmful
• Receive an electrical shock
• They will corrode the electrical contacts - correct answer- c.

Receive an electrical shock

When testing a manhole for explosive gases when should the first tests be made?

• After removing the manhole cover
• Before removing the manhole cover
• At any time
• After ventilation - correct answer- b. Before removing the

manhole cover

Atmospheric hazards encountered in manholes can include:

• non-explosive atmospheres. 2 / 3

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• non-toxic atmosphere.
• lack of oxygen.
• non-flammable atmospheres. - correct answer- c. lack of

oxygen.

When setting up to ventilate a manhole, the air inlet should be how many feet above street level?

• 4.0
• 3.0
• 2.0
• 1.0 - correct answer- c. 2.0

Which chemical may be used for odor control in a sewer system?

• Calcium chloride
• Hydrogen peroxide
• Oxidized aluminum
• Sodium chloride - correct answer- b. Hydrogen peroxide

What information must be on a warning tag attached to a switch that has been locked out?

• Directions for removing tag.
• Name of nearest physician to call in case of emergency.
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