CWEA Collection Systems Maintenance EXAM 140 QUESTIONS AND VERIFIED CORRECT ANSWERS 2023 LATEST UPDATE.

CWEA Collection Systems Maintenance EXAM 140 QUESTIONS AND VERIFIED CORRECT ANSWERS 2023 LATEST UPDATE. 1. Why are gasoline and volatile solvents objectionable when present in a sewer?: They produce an explosion hazard 2. 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 3. 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! 4. why should hydrogen sulfide be controlled?: to protect from corrosion and odors 5. Personnel entering a Permit Required Confined Space must have the following training: entry and rescue 6. To find protective gear before application of a product, you should:: look at the MSDS 7. The gas most commonly associated with septic wastewater is: Hydrogen Sulfide 8. 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) 9. What are the four conditions necessary to create an explosion?: combustible gas, adequate oxygen, heat and proper mixing of gas and oxygen 10. what does the "transition area" mean in traffic control?: It moves traffic out of its normal path 11. 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 12. 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 13. What tools are used with a power rodder?: Spring Blades 14. Tools used for sewer rodding include:: porcupine, root saw, square bar cork screw 15. What tool would you use to cut VCP pipe?: Chain Pipe Cutter 1 / 10 CWEA Collection Systems Maintenance 16. Which conditions should a gas detection device test for?: Hydrogen sulfide, explosive/flammable gases, oxygen 17. What does "LEL" mean on a gas detection meter?: Lower Explosive Limit 18. The oxygen level alarm normally goes off if oxygen levels are below:: 19.5 percent 19. 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 20. What does L.O.T.O. Stand for?: Lock out tag out 21. What document would you require to be referenced when developing an S.O.p. for hazardous substace spill clean up?: M.S.D.S. 22. 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 23. 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) 24. How long do you have to report a category 1 SSO?: 2 hours 25. 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 26. Biological activity in long, sluggish-flow, flat grade sewer lines will likely cause:: odors 27. 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 28. Clear water in entering a collection system is called what?: infiltration 29. Infiltration can occur in a pipe