ADEQ Wastewater Collections 1 Practice Test

These questions are part of the practice quiz. Start practicing

• Given the lift station data below, what is the most likely cause of the problem? Wet well inlet is normal for dry weather flow. Wet well is alternating between excessively high & low levels. Lead pump starts at right level, level continues to rise, pump stops at right level. Lead pump check valve arm remains stationary in lowered position when pump starts and stops. Lag pump check valve arm rises when lag pump starts and lowers when it stops. Force main pressure remains the same when lead pump runs, but increases when lag pump runs. Level drops when lag pump runs. Low-level pressure switch normal. High-level pressure switch normal. Electrical controls are all in automatic.
• What is the primary purpose of a lantern ring in a pump packing gland?
• What is the greatest distance between manholes for an 8-inch sewer line?
• Which of the following is addressed by chlorinating wastewater to control odors?
• Hydrogen sulfide is a toxic gas that smells like ______. At high concentrations, however, the sense of smell is deadened
• The primary safety reason for washing hands after collecting wastewater samples is to prevent exposure to:
• A common name appurtenance used to keep an accidental flow of wastewater from entering a building is called?
• When selecting pipe for acidic sewer conditions, which option is recommended?
• In sewer maintenance, what is a pig?
• Which chemical may be used for odor control in sewers?
• Which chemical is recommended for odor control in sewers?
• In sewer maintenance, what device is used to push debris through a force main?
• One cubic foot per second flow equals how many gallons per hour?
• Improper connections can be detected through
• Which of the following is a source of excessive clear water in a collection system?
• Mechanical ventilation of a lift station is required to:
• The minimum scouring velocity normally used for sanitary collection lines is
• Results obtained from pipe roughness coefficient tests can indicate whether or not:
• Which of the following is not part of a good public relations program?
• A Parshall flume is a type of
• Which tool is used to physically remove obstructions in sewers and is associated with rodding?
• What must be checked before entering a manhole?
• What is the fourth condition required for an explosion in a sewer when combustible gas, adequate oxygen, and sufficient heat are present?
• To reduce infiltration into the existing wastewater collection system, you should
• The most important reason for washing hands thoroughly after taking a wastewater sample is to
• Which of the following is included in collection system maintenance programs?
• What type of pump is not seriously damaged if the discharge valve is closed for a short time while the pump is running?
• Shoring must protrude above the top of the excavation by how many inches?
• Where should the exhaust vent be located in a chlorinator room?
• What is a potential use of a closed circuit television unit with video tape in wastewater collection systems?
• The minimum scouring velocity normally used for sanitary collection lines is
• The sign-in log for a lift station serves primarily to:
• Which statement about electrical work in a wastewater facility is true?
• Sources of harmful radioactive isotopes in wastewater collection systems include:
• A venturi meter measures quantity of fluid by
• According to Ten State Standards, when a sewer is installed parallel to a water line, what is the minimum distance away measured from the outside diameters?
• Chlorine cylinders should be stored
• Which problems can affect a sewer camera’s image, including deep water, lens fogging, and offset joints?
• A chlorine gas mask should be provided just outside the chlorine room door.
• Who must review plans for final approval before a new sewer can be constructed?
• Which gas is commonly associated with septic wastewater and can cause odor?
• When a fire hydrant is opened, it should be:
• What is the correct volume formula for a rectangular wet well?
• Leakage of seal water around the packing on a centrifugal pump is required because it acts as a
• An engineer must approve any trench shoring design above which depth?
• Which gas is commonly produced in septic wastewater?
• In a sewer with long, sluggish-flow and flat grade, what is a likely consequence of biological activity on air quality?
• Which of the following is not considered a confined space?
• Wearing rings in a pump serves to
• Litmus paper placed in an acidic solution turns which color?
• A venturi meter measures quantity of fluid by
• Which factor is the most essential when planning lift station access?
• Which method is best for recording all work performed?
• Flatter sewer line grades may cause added sewer maintenance expense and odor nuisance. The problem is most likely caused by
• As the impeller wears, how does pump efficiency change?
• What equipment is effective in removing an emergency stoppage?
• Recruiting of new utility employees falls within which management category?
• Biological activity in long, sluggish-flow, flat-grade sewer lines will likely
• Which of these chemicals should be used for odor control in sewers?
• Which rules apply to operation of gas or electric welding equipment?
• Which item is most important to check during a lift station alarm response at night?
• Which document provides 'right-to-know' information?
• Which of the following is an accepted means for applying herbicides to control roots in wastewater collection?
• In the sequence, what step follows ascertain cause?
• When selecting an emergency lighting unit, which factors should be considered?
• How far in advance must O.U.P.S. be notified before a sewer excavation begins?
• Which one of the following is a property of chlorine gas?
• On floors where water or chemicals are commonly spilled, cover the floors with what?
• Which device is commonly used to isolate a section of piping for maintenance?
• A kilowatt (KW) is equivalent to
• Decentralization of the organization refers to which concept?
• Biological activity in long, sluggish-flow, flat grade sewer lines will likely cause which problems?
• What information must be on a warning tag attached to a switch that has been locked out?
• What is used to remove grease?
• Which value on the pH scale is acidic?
• Important traffic safety considerations include
• What is a mechanical means to remove material from a sewer?
• Waste flowing at 15 percent of design flow through a 60-inch pipe interceptor may allow
• Check valves are used on the discharge side of centrifugal pumps to
• If flow is 0.5 cubic feet per second, approximately how many gallons per hour is produced?
• Before entering a manhole, which action is essential regarding the atmosphere?
• In force mains, a pig is described as
• In a trench deep enough to require a ladder, the worker must not be required to travel more than _____ to get to the ladder?
• Any excavation over ______ must have a ladder for the worker to get in and out of the trench?
• Mechanical ventilation of a lift station is required to
• Which of the following should be inspected when responding to a lift station alarm?
• A sewer-use ordinance should specify the personnel performing
• The flushing water pressure in a water-lubricated wastewater pump should be how relative to the pump discharge pressure?
• If a rod breaks during operation, what safety step should be taken before handling it?
• During concrete curing for a sewer slab, which tool is used to compact the concrete and bring a cement film to the surface for finishing?
• A pH of 7 is considered:
• Exfiltration in sewer systems refers to water that does what?
• Staffing a new system should be viewed primarily as the function of which group?
• When litmus paper is placed in an acidic solution, which color does it take?
• Which pipe material is most suitable in acidic sewer conditions?
• Which option best describes what is included in end-of-job street maintenance after sewer work?
• Which device provides access to a pipeline for inspection and cleaning?
• In the sequence of steps for addressing a motor fire, what step follows extinguishing the fire?
• Which of the following would be the best use of closed-circuit TV by wastewater collection system workers?
• In a lift station with three pumps, where pump #1 check valve is stuck open, which condition is most likely the cause?
• Which centrifugal pump component is the housing that contains the impeller?
• On floors where water or chemicals are commonly spilled, cover the floors with
• To sample for pH, you should collect a
• The temperature versus DO relationship for wastewater is such:
• You should get out of a manhole as soon as you start feeling
• Which task is performed by a collection system operator?
• Before installing or servicing electrical equipment, you should
• What should be your most important concern after a chemical spill?
• During rainfall, the wet well inflow increases and the system shows rapid cycling; lag pump motor shaft turns backwards when off. What is the most likely valve problem?
• Which equipment is effective in removing an emergency stoppage?
• The electrical disconnect for a pumping station motor can trip out under which one(s) of the following:
• What is a mechanical means to remove material from a sewer?
• How can members of a bailing crew communicate with each other?
• What is the primary function of a check valve on a pump's discharge side?
• Infiltration may result from
• Which of the following is a biological hazard in collection system operations?
• A task least likely to be performed by collection systems personnel is
• What is a key advantage of using video tape recording in sewer inspections?
• Right-to-know legislation requires information about possible health effects from contact with what?
• Gasoline and volatile solvents in a sewer are problematic primarily due to their potential to cause
• To properly operate a power rodder, which of the following actions is recommended?
• If a bad odor around a catch basin persists with the trap and water level in good order, what is the proper next step?
• One cubic foot per second flow is equal to ____ gallons per hour?
• Which gas is most commonly associated with septic wastewater?
• Which tool is not typically used for sewer rodding?
• Which permit is required for a combined sewer overflow outfall?
• Which duty is included in the industrial waste section?
• Leakage of seal water around the packing on a centrifugal pump is required because it acts as a
• Hz stands for... in electrical terminology.
• What information would you consider while clearing a stoppage in a sewer?
• What is the primary function of keeping records?
• When packing a centrifugal pump, the packing gland should be tightened
• Biological activity in long, sluggish-flow, flat-grade sewer lines will likely
• As the impeller wears on a pump, the pump efficiency will
• A pH of 6.0 is which of the following?
• What information must be on a warning tag attached to a switch that has been locked out?
• Check valves on the discharge side of centrifugal pumps serve to
• Which source is a source of excessively clear water in a collection system?
• Emergency stoppages in pipelines may be cleared safely by use of
• Flatter sewer line grades may cause added sewer maintenance expense and odor nuisance. The problem is most likely caused by
• A pH of 6 is
• Grease in sewers is mechanically removed by which method?
• Getting the facts is the first step in what part of the process?
• The amount of oxygen that may become dissolved in a given amount of water is most related to
• Which pH reading indicates an acidic wastewater?
• Which item is commonly used with a power rodder to address sewer blockages?
• The purpose of a lift station sign-in log is to
• The essence of control is which of the following?
• If the drive motor shaft is turning but the bar screen rake is not moving, which component is most likely damaged?
• Tools used for sewer rodding include
• During sewer camera operation, which problem can affect image clarity due to moisture or temperature?
• Which action is a hallmark of an effective public relations program for a wastewater utility?
• In odor management, which would not reduce sewer odors?
• Roots can enter collection systems through
• What factor must be considered when obtaining an easement for construction and maintenance of a collection system?
• After a collection system problem has been solved, which action should you take?
• Which chemical may be used for odor control in sewers?
• Which safety feature is essential around an open manhole to protect workers?
• When curing a concrete slab, which tool is used to compact the concrete and bring a cement film to the surface for finishing?
• Odor problems in sewers are not solved by which chemical option?
• In a trench where a ladder is required, the maximum distance to reach the ladder is 25 feet. Which option correctly represents this distance?
• Which of the following are reasonable objectives of a cost accounting program for a wastewater utility?
• When sewer line grades are too flat, an odor problem is likely to result. The most likely cause of the odor problem is deceased velocity, which
• Why must you always know where a cleaning tool is in the sewer?
• Which parameter most affects hydrogen sulfide generation in sewer systems?
• Which option best describes what Schedule 40 specifies for pipes?
• What is the purpose of ribs on the outside of a Wayne Sewer Ball?
• Duties assigned to an industrial waste section include which of the following?
• The most important reason for washing hands thoroughly after taking a wastewater sample is to
• When opening a power rodding properly, do the following
• Which inspection technology allows observation when the sewer camera is submerged?
• One of the electric motors in the facility has overheated and caught fire. Select the correct sequence of steps you would take.
• In order to budget a certain number of personnel, an operator should know the amount of 'backlog' work, the rate at which it increases, and how to apply ______ to determine total
• The main reason for chlorinating wastewater in sewers is for ____ control
• You should get out of the manhole as soon as
• Which items should be inspected in manholes?
• Which material resists sulfuric acid best for sewer lines?
• How does an emergency service crew try to remove a stoppage?
• What is a mechanical means to remove material from a sewer?
• A pH of 6.0 is
• During a lift station alarm response, which item is commonly inspected?
• Which document provides health hazard information to employees under right-to-know provisions?
• Why must you always know where a cleaning tool is in the sewer?
• Which factor should be considered when planning trench shoring due to vibration risk?
• Which of the following is the essential fourth condition for an explosion besides combustible gas, oxygen, and heat?
• Which of the following factors affects the flow capacity of an installed sewer line?
• Keeping sewer maps up-to-date is important for several reasons. Which of the following is the least appropriate reason?
• What is the minimum clearance required between the bottom of a water line crossing above a sewer and the crown of the sewer?
• What prevents any solution or water from backing up into the chlorine line?
• In pipeline installation, which test is used to evaluate pipe deflection when using a mandrel?
• Which statement describes a valid objective of cost accounting data in a wastewater utility?
• What tools are used with a power rodder?
• You are notified that a semi-truck was involved in an accident 5 miles upstream from the treatment plant. Storm water inlets to the combined wastewater collection system are receiving a large quantity of an unknown chemical. What is the first action that would be taken?
• After completing a sewer cleaning job, which administrative action must you perform?
• What is not the cause of grease buildup in a sewer?
• Which of the following is a centrifugal pump part?
• Wire-to-water efficiency equals which product?
• Why are gasoline and volatile solvents objectionable where present in a sewer?
• Anaerobic wastewater is frequently corrosive to materials it contacts, especially:
• The gas most commonly associated with fresh wastewater is:
• Which of the following best describes a lantern ring?
• The purpose of a lift station sign-in log is to
• You have been directed to examine and review the plans and specifications for a new wastewater pump station prior to the advertising or construction bids. Which of following is of least significance?
• Which tool is NOT used with a power rodder?
• Employee hazards in collection system operations include which of the following?
• Right-to-know information is provided by which document?
• A lantern ring is a
• Which is the safest action to take in the event of a major chlorine container leak?
• A mechanical ventilation system for the wet well portion of a lift station which operates continuously should be able to exchange the air in the wet well ______ times an hour.
• The record log of a hydraulic cleaning operation should include which item?
• What does pump efficiency measure?
• What term describes how closely a measurement matches the true value?
• Which fault is most likely if the lead pump amperage is lower than normal and the water level continues to rise after startup?
• Grease removal methods include which of the following options?
• Which outcome is most directly associated with decreased velocity in sewer lines?
• Liners are installed in sewers to correct problems caused by
• When responding to a lift station alarm, which item should be inspected?
• A Parshall flume is a type of
• Dissolved oxygen in water is most influenced by temperature; as temperature rises, DO tends to
• If an operator inhales chlorine gas, which action would be performed first?
• Sewers located adjacent to a ground storage reservoir are required to be located at least 10 feet from the structure and be constructed of water main type materials for a distance of at least 50 feet from the storage reservoir. What is the reason for this requirement?
• Lift station failures include which of the following?
• Which of the following is a type of shore?
• During manhole inspections, which items are commonly checked to ensure access safety?
• When packing a centrifugal pump, the packing gland should be tightened
• If a centrifugal pump has a discharge head that is too high, what is the effect on the discharge rate?
• Emergency stoppages in pipelines may be cleared safely by use of
• Which factor is the most common for generating hydrogen sulfide in sewers?
• Which statement about chlorine gas is true?
• When should a pH meter be standardized to ensure accurate readings?
• Which operation removes material from a sewer by cutting through debris and solids?
• Which tools are used with a power rodder?
• Which term best describes the total amount of work yet to be completed in a maintenance backlog?
• A common name appurtenance used to keep an accidental flow of wastewater from entering a building is called
• Before any excavation, which agency must be notified?
• You should get out of the manhole as soon as?
• Infiltration may result from
• Emergency stoppages in pipelines may be cleared safely by use of which of the following?
• In hydraulic cleaning documentation, which element should be recorded?
• Pipe materials that are least susceptible to corrosion by acids formed by gases generated in sewers are
• Which statement about the Wayne Sewer Ball is true?
• After completing a sewer cleaning job, which task is not necessary to perform at the manhole?
• Shoring must protrude _____ above the top of the excavation?
• Which item is an accessory used in power-bucket machine cleaning?
• Which components can serve as entry points for infiltration into a wastewater collection system?
• Tools used for sewer rodding include all but the
• The product of power factor and pump efficiency is used to determine which efficiency?
• Hydrogen sulfide formation in a wastewater collection system is usually caused by which process?
• What will happen if the discharge valve on a centrifugal pump is partially closed?
• A rattling noise coming from the lead pump most likely indicates which condition?
• What tools are used with a power rodder?
• “Schedule 40” refers to pipe
• Infiltration may result from which condition?
• Wearing rings in a pump is intended to
• Which factor is not a contributor to grease buildup in a sewer?
• Which item is not typically included in a wastewater utility budget?
• Which of the following are construction defects that can cause problems in wastewater collection systems?
• Of the following, which is not effective for eliminating sewer odors?
• If the discharge valve on a centrifugal pump is partially closed, what happens to amperage and discharge head?
• What is a mechanical means to remove material from a sewer?
• All simple slope excavations 20 feet or less in depth shall have a maximum allowable slope of?
• What must be checked before entering a manhole?
• When sewer line grades are too flat, the odor problem is most likely caused by decreased velocity, which result is produced?
• Yokes, rollers, jacks, swivels, pull in machine and loader are accessories used in
• Sources of excessively clear water in a sewer collection system include which of the following?
• Why might a lack of odor in a manhole not guarantee safety?
• Lift station failures include ________ failure.
• Which statement identifies a cutting blade used with a power rodder?
• Centrifugal pump parts include
• Which is the most important traffic safety consideration when performing sewer work?
• Which statement best describes the policy for keeping records in wastewater operations?
• In sewer maintenance, a pig is defined as
• What is the most important traffic safety consideration on a work site?
• Given the data for a second lift station, what is the most likely cause of the problem?
• Which managerial function includes guiding, teaching, motivating, and supervising treatment plant shift operators?
• At a pumping station equipped with centrifugal pumps, what caused the discharge pressure to suddenly increase and the discharge quantity to suddenly decrease?
• Which expression represents the volume of a cylinder using diameter D and length L?
• Which of the following statements about kilowatts and horsepower is true?
• Which test is performed with a mandrel during pipeline installation to assess deflection?
• A device used to test the percent deflection in a sewer pipe between manholes is known as what?
• Important considerations when reviewing the plans for a lift station include?
• In piping, what does Schedule 40 primarily indicate?
• Which treatment is ineffective for sewer odor control?
• In sewer construction, a mandrel is used to check for deflection in pipes.
• What is the normal status for lift station electrical controls?
• Which task is least likely to be performed by wastewater collection systems personnel?
• If the drive motor shaft is turning but the bar screen rake is not moving, what is the most likely cause?
• Which factor is most specifically recommended to consider for trench shoring because of vibration risk near trenches?
• Biological hazards in collection system operations include which of the following?
• Why are gasoline and volatile solvents objectionable when present in a sewer?
• In sewer maintenance, what is a pig?
• Infiltration is caused by
• Employee hazards in collection system operations include which of the following?
• What is the most important reason for washing hands after taking a wastewater sample?
• Which method is commonly used to detect improper connections in sewer systems?
• Which items should be inspected when responding to a lift station alarm at night?
• A chlorine gas mask should be provided
• In acid-bearing sewer networks, which material is preferred?
• In a rainfall-affected lift station, the most likely valve issue causing rapid lag pump cycling is which option?
• Which statement reflects proper practice for keeping records in annual reporting?
• When an employee breaks the rules and requires discipline, who is responsible for administering it?
• There are two components involved with the managerial functions and reporting to a higher authority.
• Who is authorized to remove the warning tag on a locked-out switch?
• In sewer maintenance, what is a pig?
• If a pump is delivering less flow than expected, which condition is most likely the cause?
• Which of the following is a property of chlorine gas?
• In a lift station, which observation would most strongly indicate the lead pump is air-bound?
• Which statement is true about odor control in sewers?
• You should never attempt to install, troubleshoot, maintain or replace electrical equipment panels, controls, wiring or circuits unless
• Which task is least likely to be performed by collection systems personnel?
• Your chlorinator room should have an exhaust vent installed
• Disaster planning is best described as which of the following?
• At what trench depth must proper shoring be provided?
• Roots enter collection systems through which of the following paths?
• Which of the following statements about infiltration in sewer systems is true?
• A kilowatt is equal to which of the following?
• In handling a motor overheating and fire, what is the correct step immediately after shutting off power?
• Which device measures flow based on pressure difference across a constricted section?
• Sources of excessive clear water in a collection system include
• How can a closed circuit television unit with video tape help to evaluate the condition of a wastewater treatment system?
• Velocity may be sensed in which ways?
• Rodents and insects can be controlled by
• Which of the following is the standard gallons per hour equivalent for 1 cubic foot per second?
• In piping standards, Schedule 40 primarily indicates which characteristic?
• Which method is best for recording all work performed?
• Which term describes water entering a sewer from groundwater due to a high water table?
• Which of the following is a type of shore?
• In the sequence, what step comes after repair?
• A worker notices a necessary piece of equipment is defective and the current job must be finished soon. What should the worker do?
• At low flow through a 60-inch pipe interceptor, which condition might occur?
• Chlorine cylinders should be stored
• Which of the following is not a direct use of closed-circuit TV by wastewater workers?
• Enclosed, open, and semi-closed are terms used for the designation and selection of
• Which statement best describes the effect of flat sewer grades on solids in the lines?
• What information should be considered when clearing a sewer stoppage?
• For any CSO outfall pipe, which of the following is required?
• The purpose of ribs on the outside of a Wayne Sewer Ball is to
• A mandrel is employed to verify a pipe's ability to resist deformation under standard conditions.
• Which of the following is NOT a factor to consider when selecting an emergency lighting unit?
• Leakage of seal water around the packing on a centrifugal pump is required because it acts as a
• What information must be on a warning tag attached to a switch that has been locked out?
• What is the greatest distance between manholes for an 8-inch sewer line?
• In the same sequence, what step comes after tagging and locking out power?
• Hydrogen sulfide gas smells like which of the following?
• Motor efficiency is defined as the ratio of what?
• What device is used to test percent deflection in a sewer pipe between manholes?
• For sewer flows containing sulfuric acid, which pipe material is best?
• Who is typically responsible for administering disciplinary action when an employee breaks the rules?
• A pH of 7 is which of the following?
• You should get out of a manhole as soon as you start feeling
• A kilowatt is equivalent to which of the following?
• Which option will not solve an odor problem in a sewer?
• A lift station's wet well level readings are erratic with alternating high and low levels, and both pumps start and stop inconsistently. What is the most likely cause?
• A pump is delivering at less than the expected rate of discharge. What will not cause this to happen?
• Following completion of a sewer cleaning job, which action must be performed at the manhole?
• Which of the following is not typical of a 'submersible' pump?
• What is the purpose of the minimum scouring velocity value in sanitary mains?
• What is the primary purpose of a mandrel in sewer work?
• Which formula correctly expresses the relationship between wire-to-water efficiency and its components?
• Which action should be performed first if an operator inhales chlorine gas?
• Which issue commonly causes pump vibration?
• Which statement best describes the pH value of 6.0?
• Enclosed, open, and semi-closed are terms used for designation and selection of impellers.
• Which statement best describes alarm systems in a normally operating lift station?
• Which action is typically done at the end of a sewer cleaning job to ensure the area is left safe and clean?
• Enclosed, open, and semi-closed are terms used for designation and selection of
• Using water on a gas chlorine leak will?
• Hydrogen sulfide is a toxic gas that smells like ____. At high concentrations of hydrogen sulfide, however, the sense of smell is deadened and no odor is detected.
• What is the primary purpose of a backwater valve?
• The gas most commonly associated with septic wastewater is
• When a centrifugal pump's discharge valve is closed for a short time while running, which statement is true?
• Under what condition should electrical work in a sewer system be performed?
• Mechanical ventilation of a lift station is used primarily to ensure safe working access.
• Wearing rings are installed in a pump to achieve what?
• Which device measures flow by pressure difference across a constriction?
• Which statement correctly identifies a cutting blade used with a power rodder?
• The ribs on a Wayne Sewer Ball primarily facilitate which effect?
• Grease in sewers is mechanically removed by which method?
• Which gas in sewer spaces is known for its rotten-egg odor and toxicity?
• In problem solving, which step involves clearly stating the issue to be addressed?
• What is the minimum distance from the edge of the spoils to the edge of the trench?
• Which of the following items should be inspected when responding to a lift station alarm at night?
• Long, sluggish-flow, flat-grade sewer lines will likely cause which of the following?
• Which statement correctly describes the pH of acidic wastewater?
• At what trench depth is proper shoring required?
• Which agency must be notified prior to excavation?
• Which safety practice is true before entering a manhole?
• Engineer approval is required for trench shoring designs exceeding what depth?
• What information would you consider while clearing a stoppage in a sewer?
• A pump is delivering less than the expected rate of discharge. Which condition is most likely causing this?
• A pH neutral is achieved at which value?
• In long, sluggish-flow lines, biological activity is likely to cause which of the following conditions?
• The purpose of ribs on the outside of a Wayne Sewer Ball is to:
• Which item is not listed as a possible lift station failure?
• Disaster planning is useful in reducing confusion in the event of a disaster. Which option best reflects this idea?
• Which of the following is NOT considered when clearing a stoppage in a sewer?
• Check valves are used in connection with centrifugal pumps in order to
• Which statement accurately reflects lift station alarm procedures?
• What is the most widely used prime mover in pumping plants?
• Decentralization of the organization refers to which concept?
• With the completion of a sewer cleaning job, which must be done at the manhole?
• Which pipe material is least susceptible to corrosion by acids formed by gases generated in sewers?
• A Parshall flume is described as a Venturi-type device.
• When opening a power rodder properly, do the following?
• Which tool is used for sewer rodding?