Question

1. tasks least likely to be performed by collection system personnel is

a. making water connections
b. inspecting and testing manholes
c. cleaning sewer stoppages
d. maintaining collection systems equipment

1. you should get out of a manhole as soon as the

a. flow increases slightly
b. h2s exceeds 5 ppm
c. lower explosive level alarm activates
d. none of the above

1. which of these chemicals may be used for odor control in sewers?

a. sodium chloride
b. muriatic acid
c. chlorine
d. potassium chloride

1. a common appurtenance used to keep an accidental flow of wastewater from entering a building is called

a. catch basin
b. cleanout
c. barrel
d. backflow valve

1. what tools are used with a power rodder?

a. spring blades
b. pruning sheers
c. finger grips
d. videotape camera

1. with the completion of a sewer cleaning job, which of the following must be done at the manhole?

a. wash down the truck
b. complete and sign timesheets
c. wash down the street and equipment around the work area, making sure the wash water is swept into the manhole
d. none of the above

1. roots most often enter the collection system through

a. manhole covers
b. air gaps
c. lamp holes
d. pipe cracks

Explanation:

1. Collection system personnel are responsible for maintaining and operating the sewer collection system. Making water connections is typically a task related to water supply rather than sewer collection systems.
2. The lower explosive level alarm indicates a potentially dangerous situation in the manhole, and personnel should exit immediately.
3. Chlorine is commonly used for odor control in sewers as it can disinfect and oxidize odor - causing compounds.
4. A backflow valve prevents wastewater from flowing back into a building.
5. Spring blades are tools used with a power rodder for cleaning sewers.
6. None of the options a, b, or c are mandatory tasks specifically related to the manhole after a sewer cleaning job.
7. Roots most often enter the collection system through pipe cracks as they can grow into small openings in the pipes.

Answer:

1. a. Making water connections
2. c. Lower explosive level alarm activates
3. c. Chlorine
4. d. Backflow valve
5. a. Spring blades
6. d. None of the above
7. d. Pipe cracks