ADEQ Wastewater Collections 1 Practice Test

These questions are part of the practice quiz. Start practicing

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