CWEA Collection Systems Maintenance Exam Questions and Answers 2024

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 equipment panels, controls, wiring or circuits unless - You know what you are doing, are qualified and are authorized

What are the different areas of traffic zones? - 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? - to protect from corrosion and odors

Personnel entering a Permit Required Confined Space must have the following training - entry and rescue

To find protective gear before application of a product, you should: - look at the MSDS

The gas most commonly associated with septic wastewater is - 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: - some dangerous gasses are odorless (for example, carbon monoxide)

What are the four conditions necessary to create an explosion? - combustible gas, adequate oxygen, heat and proper mixing of gas and oxygen

what does the "transition area" mean in traffic control? - It moves traffic out of its normal path

what elements should be considered to improve worker safety in High speed Temporary Traffic control Zones? - 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? - Traffic Control Plan, By-Pass connections, and Spill containment

What tools are used with a power rodder? - Spring Blades

Tools used for sewer rodding include: - porcupine, root saw, square bar cork screw

What tool would you use to cut VCP pipe? - Chain Pipe Cutter

Which conditions should a gas detection device test for? - Hydrogen sulfide, explosive/flammable gases, oxygen

What does "LEL" mean on a gas detection meter? - Lower Explosive Limit

The oxygen level alarm normally goes off if oxygen levels are below: - 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? - The L.O.T.O Program

What does L.O.T.O. Stand for? - Lock out tag out

What document would you require to be referenced when developing an S.O.p. for hazardous substace spill clean up? - 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? - 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: - SSMP (Sewer System Management Plan)

How long do you have to report a category 1 SSO? - 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? - Using the GPS coordinates

Biological activity in long, sluggish-flow, flat grade sewer lines will likely cause: - odors

Flatter sewer line grades may cause added sewer maintenance expense and odor nuisance. This is caused by what? - 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? - infiltration

Infiltration can occur in a pipe when the pipe is: - cracked, broken, fractures, has roots coming into it etc.

The main reason we add sodium hypochlorite to sewers is to control: - BOD