Why are gasoline and volatile solvents objectionable when present in a sewer? - They produce an explosion hazard You should never attempt to install, maintain, repair or replace electrical equ ipment panels, controls, wiring or circuits unless - You know what you are doing, are qualified and are au...
cwea collection systems maintenance | 140 questions with 100 correct answers
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CWEA Collection Systems Maintenance | 140
Questions with 100% Correct Answers
Why are gasoline and volatile solvents objectionable when present in a sewer? Correct Answer:
They produce an explosion hazard
You should never attempt to install, maintain, repair or replace electrical equipment panels,
controls, wiring or circuits unless Correct Answer: You know what you are doing, are qualified
and are authorized
What are the different areas of traffic zones? Correct Answer: Advance Warning Area,
Transition Area, Activity Area (buffer space and work space), Termination Area. Could be 4 or
5, justify your answer on the test!
why should hydrogen sulfide be controlled? Correct Answer: to protect from corrosion and
odors
Personnel entering a Permit Required Confined Space must have the following training Correct
Answer: entry and rescue
To find protective gear before application of a product, you should: Correct Answer: look at the
MSDS
The gas most commonly associated with septic wastewater is Correct Answer: Hydrogen
Sulfide
The lack of an unpleasant odor in a manhole, lift station or other structures does not always mean
that dangerous gases are not present because: Correct Answer: some dangerous gasses are
odorless (for example, carbon monoxide)
What are the four conditions necessary to create an explosion? Correct Answer: combustible
gas, adequate oxygen, heat and proper mixing of gas and oxygen
what does the "transition area" mean in traffic control? Correct Answer: It moves traffic out of
its normal path
what elements should be considered to improve worker safety in High speed Temporary Traffic
control Zones? Correct Answer: Rerouting traffic around the work site, positioning of law
enforcement officers in the temporary traffic control zone, and work zone training
What key features would you need to address when developing an S.O.P. for a Lift Station
failure? Correct Answer: Traffic Control Plan, By-Pass connections, and Spill containment
What tools are used with a power rodder? Correct Answer: Spring Blades
, Tools used for sewer rodding include: Correct Answer: porcupine, root saw, square bar cork
screw
What tool would you use to cut VCP pipe? Correct Answer: Chain Pipe Cutter
Which conditions should a gas detection device test for? Correct Answer: Hydrogen sulfide,
explosive/flammable gases, oxygen
What does "LEL" mean on a gas detection meter? Correct Answer: Lower Explosive Limit
The oxygen level alarm normally goes off if oxygen levels are below: Correct Answer: 19.5
percent
When developing an S.O.P. for scheduled maintenance of electrical equipment, what program
should be addressed as a primary safety guideline? Correct Answer: The L.O.T.O Program
What does L.O.T.O. Stand for? Correct Answer: Lock out tag out
What document would you require to be referenced when developing an S.O.p. for hazardous
substace spill clean up? Correct Answer: M.S.D.S.
in developing an S.O.P. for air monitoring in a Permit Required Confined Space you would
include what two factors? Correct Answer: Placement of the blower and a weather forecast
According to the State Water Resources Control Board Order No. 2006-003-DWQ, each enrollee
must develop and implement a system-specific: Correct Answer: SSMP (Sewer System
Management Plan)
How long do you have to report a category 1 SSO? Correct 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, how must you report the location? Correct Answer:
Using the GPS coordinates
Biological activity in long, sluggish-flow, flat grade sewer lines will likely cause: Correct
Answer: odors
Flatter sewer line grades may cause added sewer maintenance expense and odor nuisance. This is
caused by what? Correct Answer: A decrease in velocity which allows organic and inorganic
solids to settle out. This, in turn, allows biological activity to happen which corrodes the pipe and
releases hydrogen sulfide (H2S) which smells like rotten eggs
Clear water in entering a collection system is called what? Correct Answer: infiltration
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