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 1 / 2
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
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