CWEA Collections System Maintenance Grade 3(Questions And Answers)2023

CWEA Collections System Maintenance Grade 3(Questions And Answers)2023 A Flagger should Stand? A. On the shoulder adjacent to traffic being controlled B. In the closed lane before stopping vehicle traffic C. In the traffic lane. D. As stated in "A" or "B" above. D. As stated in "A" or "B" above. Legally responsible officials are required to report category 1 sanitary sewer overflows? A. Within 30 days B. Before end of the day C. As soon as possible D. Within 2 hours D. Within 2 hours When working in confined spaces or sewers, what form of lighting would you use? A. Mirrors to direct the sunlight or explosion proof lighting. B. Ordinary electric lights C. Propane, Gas, or kerosene lanterns D. Special matches A. Mirrors to direct the sunlight or explosion proof lighting. What can happen if water-based substances are used to extinguish electrical fires? a. Nothing but extinguish the fire b. The fumes are not harmful c. Receive an electrical shock d. They will corrode the electrical contacts c. Receive an electrical shock When testing a manhole for explosive gases when should the first tests be made? a. After removing the manhole cover b. Before removing the manhole cover c. At any time d. After ventilation b. Before removing the manhole cover Atmospheric hazards encountered in manholes can include: a. non-explosive atmospheres. b. non-toxic atmosphere. c. lack of oxygen. d. non-flammable atmospheres. c. lack of oxygen. When setting up to ventilate a manhole, the air inlet should be how many feet above street level? a. 4.0 b. 3.0 c. 2.0 d. 1.0 c. 2.0 Which chemical may be used for odor control in a sewer system? a. Calcium chloride b. Hydrogen peroxide c. Oxidized aluminum d. Sodium chloride b. Hydrogen peroxide What information must be on a warning tag attached to a switch that has been locked out? a. Directions for removing tag. b. Name of nearest physician to call in case of emergency. c. Signature of person who locked out switch and who is the only person authorized to remove tag. d. Time to unlock switch. c. Signature of person who locked out switch and who is the only person authorized to remove tag. Under what conditions must each member of the rescue service practice permit space rescues? a. At least once a year in a simulated situation or by the satisfactory performance of an actual rescue. b. At least twice a year in simulated situations. c. At least once a year in simulated situation using non-representative space conditions d. At least four times a year. a. At least once a year in a simulated situation or by the satisfactory performance of an actual rescue. How is a permit-required space described? a. Has or may contain atmospheric, engulfment, design, or other serious health/safety hazard. b. Is large enough to enter and work in and is meant for continuous occupancy. c. Is large enough to enter and work in and has an unrestricted entry/exit. d. Never contains an atmospheric or engulfment hazard. a. Has or may contain atmospheric, engulfment, design, or other serious health/safety hazard. What are the three duties of personnel in a Confined Space entry? a. Authorized entrants, parking attendants, entry supervisors. b. Unauthorized entrants, attendants, entry supervisors. c. Authorized entrants, attendants, entry supervisors. d. Authorized entrants, attendants, evening supervisors c. Authorized entrants, attendants, entry supervisors. What is an important element of hydrogen sulfide production? a. Flow velocity. b. Pipe materials. c. Amount of odor present. d. Amount of inorganic materials. a. Flow velocity. Which of the following is the most common factor leading to the generation of hydrogen sulfide in sewers? a. Anaerobic conditions. b. Constantly high velocity of flow in sewers. c. Low concentrations of ferrous sulfide. d. Presence of highly soluble fats and oils. a. Anaerobic conditions. A category 2 SSO is: a. any SSO which does not reach surface waters. b. not reportable. c. preventable. d. any SSO which is not category 1. d. any SSO which is not category 1. Which tool would you use for cleaning under a pipe, or hard dirt near a pipe? a. Miner's pick. b. Wrench. c. Drill. d. Hammer. a. Miner's pick. A torque wrench is used to tighten which device? a. Pipe clamp. b. Drill chuck. c. Light bulb. d. Sheet metal screw a. Pipe clamp. Which unit uses high water pressure and a vacuum to clean sewer lines? a. Jetter b. Mechanical rodder c. Combination unit d. Bucket machine c. Combination unit In sewer maintenance, what is a pig? a. A ball forced through a sewer line. b. A power rod. c. Any foul smelling equipment. d. The hydraulic rodding truck. a. A ball forced through a sewer line. When pouring a concrete slab, which of the following tools is used to finish the concrete? a. Grasshopper. b. Tamper. c. Trowel. d. Vibrator. c. Trowel. What tool is used to snare a broken section of sewer rod? a. Square stock corkscrew. b. Auger. c. Pickup tool. d. Pull out tool. c. Pickup tool. Why is the replacement of wastewater collection systems in some downtown streets difficult? a. Crowding of other underground utilities. b. Records have not been maintained properly and the collection system is lost. c. Some people have landscaped their backyards over the collection system and do not want their yards dug up. d. The streets will have to be paved again a. Crowding of other underground utilities. How can the velocity of water flowing in a sewer be estimated? a. Driving between manholes and reading the speedometer. b. Measuring the Manning's roughness coefficient for the sewer. c. Measuring the time it takes for the dye to be carried by the wastewater between the two manholes. d. Measuring the time it takes to run between the two manholes. c. Measuring the time it takes for the dye to be carried by the wastewater between the two manholes. Drawings which are considered "As Built" would be? a. Construction drawings issued to the contractor. b. Corrected construction drawings showing changes made in the field installation. c. Detailed drawings of proposed construction. d. Sectional maps on file. b. Corrected construction drawings showing changes made in the field installation. In lieu of a shorting system, the sides or the walls of an excavation, or trench, may be: a. sloped 3:1. b. sloped 1:3. c. sloped 2:1. d. sloped 1:1. a. sloped 3:1. When a water main must be laid under a sewer main, the sewer pipe must be: a. lined with epoxy. b. cleaned carefully. c. replaced with water type pipe with pressure tight joints. d. taken out while the water main is being installed. c. replaced with water type pipe with pressure tight joints. Hydrogen peroxide controls odors in sewers by: a. decreasing the dissolved oxygen. b. neutralizing the PH.