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Wastewater Collection Operator Class III study materials
Wastewater Collection Operator Class III study resources

Wastewater Collection Operator Class III practice questions

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Question 1Safety and Confined Space Entry

What is the minimum oxygen concentration, by volume, that must be present before a worker may enter a permit-required confined space without supplied air?

  1. 18.0 percent
  2. 16.0 percent
  3. 19.5 percent Correct answer.
  4. 21.0 percent

Explanation

Atmospheric testing for entry requires oxygen to be at least 19.5 percent and no more than 23.5 percent by volume. Below 19.5 percent the space is oxygen deficient and entry requires supplied-air respiratory protection.

Question 2Safety and Confined Space Entry

Under OSHA confined space rules, which atmospheric condition defines an oxygen-enriched space?

  1. Oxygen above 23.5 percent by volume Correct answer.
  2. Oxygen above 25.0 percent by volume
  3. Oxygen above 21.0 percent by volume
  4. Oxygen above 19.5 percent by volume

Explanation

The permit-required confined space standard treats atmospheres exceeding 23.5 percent oxygen as oxygen enriched and hazardous due to fire and explosion risk. Normal air at about 21 percent is not considered enriched.

Question 3Safety and Confined Space Entry

Which gas is the most common cause of confined space fatalities in wastewater collection systems because it is odorless and displaces oxygen?

  1. Hydrogen sulfide
  2. Oxygen
  3. Methane Correct answer.
  4. Carbon monoxide

Explanation

Methane is generated by anaerobic decomposition of organic material in sewers and is both odorless and lighter than air, so it accumulates and displaces oxygen while also creating an explosion hazard. Hydrogen sulfide has a strong odor at low levels and is a separate hazard.

Question 4Safety and Confined Space Entry

Which instrument should be used to test a confined space atmosphere before entry?

  1. A combustible gas indicator only
  2. A calibrated multi-gas meter with an oxygen sensor Correct answer.
  3. A colorimetric detector tube only
  4. A personal noise dosimeter

Explanation

Pre-entry testing requires measurement of oxygen, flammable gases and vapors, and toxic gases, which a calibrated multi-gas meter performs. Testing only one parameter leaves the other hazards unevaluated.

Question 5Safety and Confined Space Entry

What is the primary purpose of a confined space attendant?

  1. To perform the entry and complete the work inside the space
  2. To operate the ventilation blower from inside the space
  3. To test the atmosphere after entrants have already entered
  4. To monitor entrants and summon help without entering the space Correct answer.

Explanation

The attendant stays outside the space, tracks the number and identity of entrants, monitors conditions, and calls for rescue if needed. The attendant does not enter the space to perform rescue or work.

Question 6Safety and Confined Space Entry

Before entry into a permit-required confined space, who must authorize the entry?

  1. Any co-worker on site
  2. The entrant with the most seniority
  3. The entry supervisor Correct answer.
  4. The attendant on duty

Explanation

The entry supervisor verifies that pre-entry conditions, testing, and permits are in order and authorizes entry. The attendant and entrants do not have authority to approve entry.

Question 7Safety and Confined Space Entry

Which of the following is a physical hazard commonly found in wastewater collection confined spaces?

  1. Welding arc flash
  2. Falling objects and slippery, steep-sided interiors Correct answer.
  3. Ionizing radiation
  4. High-voltage switchgear

Explanation

Wastewater structures such as wet wells and manholes present physical hazards including falls, slipping, and falling debris. The other listed hazards are associated with industrial processes rather than typical collection system structures.

Question 8Safety and Confined Space Entry

A worker must enter a wet well where testing shows 15 percent oxygen. Which action is required?

  1. Enter with a dust mask and finish quickly
  2. Do not enter until the atmosphere is ventilated and retested Correct answer.
  3. Enter only if a second worker stands at the top
  4. Enter if the worker holds a breath and is tethered

Explanation

An oxygen level of 15 percent is below the 19.5 percent minimum and is immediately dangerous to life or health. Entry is prohibited until ventilation restores acceptable conditions and the space is retested.

Question 9Safety and Confined Space Entry

Continuous forced-air ventilation of a confined space should be arranged so that:

  1. the blower is turned off once the entrant is inside
  2. the blower intake is placed inside the space
  3. the space is sealed and pressurized before entry
  4. fresh air is supplied to the bottom and exhaust is drawn from the top Correct answer.

Explanation

Lighter-than-air contaminants and methane accumulate near the top while heavier gases and vapors collect low, so supply and exhaust placement should promote displacement of the full volume. Ventilation must continue while entrants are inside.

Question 10Safety and Confined Space Entry

An entrant inside a sewer manhole begins to feel dizzy and the multi-gas meter alarms for hydrogen sulfide. What is the correct immediate action?

  1. Ask the attendant to retest before deciding
  2. Don the escape respirator and finish the task
  3. Evacuate the space immediately and account for all entrants Correct answer.
  4. Increase ventilation and continue working

Explanation

When an alarm sounds or an entrant reports symptoms, entrants must evacuate immediately and the attendant must account for everyone. Ventilation adjustments and retesting occur only after the space is cleared.

Question 11Safety and Confined Space Entry

Which statement best describes an IDLH atmosphere?

  1. An atmosphere that poses an immediate threat of death or irreversible health effects Correct answer.
  2. An atmosphere requiring only a half-face respirator
  3. An atmosphere that is merely unpleasant but safe for short exposures
  4. An atmosphere that exceeds the lower explosive limit by any amount

Explanation

IDLH means immediately dangerous to life or health, an atmosphere that can cause death or irreversible harm on short exposure or impair escape. It requires supplied-air respiratory protection and special entry procedures.

Question 12Safety and Confined Space Entry

Before an entrant enters a permit-required confined space, which item must be verified as part of the entry permit?

  1. The entrant's social security number
  2. The name of the equipment vendor
  3. The number of prior entries into the space
  4. The results of pre-entry atmospheric testing Correct answer.

Explanation

The entry permit documents pre-entry atmospheric testing results along with hazards, controls, and rescue provisions. Personal identifiers, vendor names, and entry counts are not required permit elements.

Question 13Safety and Confined Space Entry

What is the minimum number of trained rescuers required to be available when entrants enter a permit-required confined space?

  1. At least three, all inside the space
  2. At least two, with one positioned outside the space Correct answer.
  3. At least one, provided the attendant is trained
  4. At least four, staged at the site entrance

Explanation

Rescue provisions require at least two trained rescuers, with at least one stationed outside the space so a rescue can proceed without the second entering alone. Rescuers must be trained in the specific space and rescue equipment.

Question 14Safety and Confined Space Entry

A worker is overcome inside a manhole. What should the attendant do first?

  1. Lower a rope and instruct the worker to climb out
  2. Enter immediately to pull the worker out
  3. Call for the trained rescue team and summon emergency services Correct answer.
  4. Wait until the atmosphere clears before acting

Explanation

The attendant must never enter to attempt rescue; untrained rescue attempts account for many confined space fatalities. The attendant should summon the trained rescue team and emergency services while maintaining contact and preventing unauthorized entry.

Question 15Safety and Confined Space Entry

Which practice reduces the risk of introducing a flammable atmosphere during confined space entry?

  1. Using non-sparking tools and intrinsically safe lighting Correct answer.
  2. Wearing cotton coveralls
  3. Using a gasoline-powered blower near the opening
  4. Storing fuel cans inside the space

Explanation

Ignition sources must be controlled in a space where flammable gases or vapors may be present, so non-sparking tools and intrinsically safe electrical equipment are required. Fuel and combustion equipment near the opening can supply ignition or carbon monoxide.

Question 16Safety and Confined Space Entry

Which statement about the lower explosive limit (LEL) of methane is correct?

  1. The LEL decreases as oxygen increases
  2. Entry is prohibited when the reading exceeds 10 percent of the LEL Correct answer.
  3. The LEL is the concentration above which the gas will not burn
  4. Entry is acceptable at any reading below 50 percent of the LEL

Explanation

Common practice and many permit programs prohibit entry when flammable gas readings exceed 10 percent of the LEL. The LEL is the minimum concentration that supports combustion, not the maximum.

Question 17Safety and Confined Space Entry

A confined space entry permit is generally valid for how long?

  1. Indefinitely, if conditions remain unchanged
  2. For the duration of one shift or the stated period, whichever is shorter Correct answer.
  3. Until the task is completed, regardless of duration
  4. For one calendar week

Explanation

Permits are issued for a limited duration, typically one shift or the period stated on the permit, and must be reissued if conditions change or the task extends beyond that period. Permits are not open-ended.

Question 18Safety and Confined Space Entry

Why must atmospheric testing be performed in a specific order (oxygen, flammables, then toxics) on many multi-gas meters?

  1. Because toxics are always tested last by regulation
  2. Because combustible readings depend on oxygen and cross-interference affects results Correct answer.
  3. Because the meter requires the operator to enter the space first
  4. Because toxic sensors are destroyed by oxygen

Explanation

Combustible gas sensors rely on oxygen to produce a reading, and certain gases cross-interfere with sensors, so testing oxygen first and flammables before toxics yields reliable results. The order is a technical requirement of sensor function.

Question 19Safety and Confined Space Entry

An entrant must work in a space where hydrogen sulfide is present at levels above the substance's exposure limit but below IDLH. What is the appropriate control?

  1. Supplied-air or appropriate respiratory protection plus ventilation Correct answer.
  2. A cloth soaked in water
  3. No control is needed if the exposure is brief
  4. A dust mask

Explanation

When engineering controls such as ventilation cannot reduce exposure below the limit, appropriate respiratory protection is required, and supplied air is used where the atmosphere is or may become IDLH. Dust masks and wet cloths provide no protection against hydrogen sulfide.

Question 20Safety and Confined Space Entry

Which of the following best describes the purpose of a confined space hazard assessment before entry?

  1. To estimate the cost of the job
  2. To decide which entrant will work fastest
  3. To identify hazards and determine the controls, testing, and rescue arrangements needed Correct answer.
  4. To assign blame for prior incidents

Explanation

A hazard assessment identifies the hazards present, evaluates their severity, and establishes the controls, atmospheric testing, and rescue provisions required. It is a planning tool, not an administrative or cost exercise.

Question 21Safety and Confined Space Entry

A worker is exposed to hydrogen sulfide at a concentration that deadens the sense of smell. What is the significance of this effect?

  1. The worker should continue working without a meter
  2. The gas has dissipated and the space is safe
  3. The worker can no longer rely on odor as a warning of dangerous levels Correct answer.
  4. The gas has become non-toxic

Explanation

At higher concentrations hydrogen sulfide causes olfactory fatigue, so the absence of odor does not mean the gas is gone. Odor is never a reliable indicator, and continuous monitoring is required.

Question 22Safety and Confined Space Entry

Which action is required when a confined space entry is completed?

  1. Leave the space open without barriers
  2. Cancel the permit and close or secure the space Correct answer.
  3. Keep the permit active for the next shift
  4. Remove all warning signs before leaving

Explanation

When the entry is finished, the permit is canceled and the space is closed or secured with barriers and signage to prevent unauthorized entry. Permits are not carried over to later shifts.

Question 23Safety and Confined Space Entry

What is the purpose of a retrieval system such as a tripod and winch for confined space entry?

  1. To measure the depth of the space
  2. To allow non-entry rescue of an incapacitated entrant Correct answer.
  3. To lower tools and materials into the space
  4. To support the walls of the excavation

Explanation

A retrieval system permits rescuers to raise an incapacitated entrant without entering the space, which is the preferred and safest rescue method. It is not a materials handling or shoring device.

Question 24Safety and Confined Space Entry

During entry into a sewer line, a worker notes the atmosphere is within limits but the space is very deep with a narrow opening. Which additional control is most appropriate?

  1. Rely on natural ventilation only
  2. Allow entry without a permit because the atmosphere is acceptable
  3. Provide mechanical ventilation and a retrieval system with continuous monitoring Correct answer.
  4. Send the attendant in with the entrant

Explanation

Even with acceptable initial readings, deep, poorly ventilated spaces require mechanical ventilation, continuous monitoring, and retrieval provisions because conditions can change. Atmospheric acceptability alone does not eliminate the need for other controls.

Question 25Wastewater Sources, Characteristics, and Flow

Which term describes the flow that enters a sewer system from sources such as roof downspouts, foundation drains, and yard drains during rain events?

  1. Sanitary sewage
  2. Infiltration
  3. Stormwater inflow Correct answer.
  4. Industrial discharge

Explanation

Inflow is direct stormwater that enters the collection system through connected drains and downspouts rather than through soil. Infiltration, by contrast, is groundwater that seeps in through defects in pipes and joints.

Question 26Wastewater Sources, Characteristics, and Flow

What is the typical design average daily dry-weather flow contribution used for a single-family residential dwelling when sizing a sanitary sewer?

  1. About 1,000 gallons per capita per day
  2. About 25 gallons per capita per day
  3. About 100 gallons per capita per day Correct answer.
  4. About 400 gallons per capita per day

Explanation

Design standards commonly use roughly 100 gallons per capita per day for residential dry-weather flow, with typical ranges of 60 to 100 gallons per person per day. This figure is then multiplied by the population served and adjusted for commercial and industrial contributions.

Question 27Wastewater Sources, Characteristics, and Flow

What does the term biochemical oxygen demand (BOD) measure in a wastewater sample?

  1. The total suspended solids removed by settling
  2. The dissolved oxygen remaining after treatment
  3. The oxygen consumed by microorganisms decomposing organic matter Correct answer.
  4. The chlorine residual needed for disinfection

Explanation

BOD measures the oxygen consumed by bacteria as they oxidize organic material in the sample over a set incubation period. It is a key indicator of the organic strength of the wastewater and the loading on treatment processes.

Question 28Wastewater Sources, Characteristics, and Flow

A sewer carries a peak wet-weather flow of 4.0 million gallons per day. Expressed in cubic feet per second, what is this flow?

  1. About 8.9 cfs
  2. About 6.2 cfs Correct answer.
  3. About 4.5 cfs
  4. About 2.2 cfs

Explanation

One million gallons per day equals approximately 1.547 cubic feet per second. Multiplying 4.0 by 1.547 gives about 6.2 cfs.

Question 29Wastewater Sources, Characteristics, and Flow

Which condition most commonly causes a sustained increase in dry-weather infiltration into an older vitrified clay sewer main?

  1. High groundwater table above the pipe invert Correct answer.
  2. Heavy rainfall on connected roof drains
  3. Peak morning water use in the service area
  4. Illicit sump pump connections

Explanation

Infiltration is driven by groundwater elevation relative to the pipe. When the water table rises above the pipe, groundwater enters through cracks, joint failures, and deteriorated mortar. Rainfall-driven and pump-driven flows are classified as inflow, not infiltration.

Question 30Wastewater Sources, Characteristics, and Flow

What is the primary purpose of a flow monitor installed in a trunk sewer upstream of a treatment plant?

  1. To measure the pH of industrial discharges
  2. To determine the sludge age of the activated sludge process
  3. To quantify flow volumes for capacity planning and reporting Correct answer.
  4. To measure chlorine demand of the incoming wastewater

Explanation

Flow monitors record the volume and rate of wastewater moving through the collection system, which supports capacity evaluation, inflow and infiltration studies, and regulatory reporting. Other parameters such as pH or chlorine demand require separate instrumentation.

Question 31Wastewater Sources, Characteristics, and Flow

A community of 12,000 people contributes an average dry-weather flow of 100 gallons per capita per day. What is the average daily flow in million gallons per day?

  1. 12 mgd
  2. 120 mgd
  3. 0.12 mgd
  4. 1.2 mgd Correct answer.

Explanation

Multiplying 12,000 people by 100 gallons per capita per day gives 1,200,000 gallons per day, which equals 1.2 mgd.

Question 32Wastewater Sources, Characteristics, and Flow

Which wastewater constituent is most directly responsible for the rotten-egg odor sometimes detected at manholes?

  1. Hydrogen sulfide Correct answer.
  2. Nitrate
  3. Settleable grit
  4. Phosphate

Explanation

Hydrogen sulfide forms when sulfate is reduced under septic, oxygen-depleted conditions in the collection system and produces a distinctive rotten-egg odor. It is also corrosive to concrete and a safety hazard in confined spaces.

Question 33Wastewater Sources, Characteristics, and Flow

A sewer reach has a design peak flow of 3.5 mgd and is to be sized so that the peak flow does not exceed 70 percent of full-pipe capacity. What minimum full-flow capacity, in mgd, is required?

  1. 2.45 mgd
  2. 7.0 mgd
  3. 5.0 mgd Correct answer.
  4. 3.5 mgd

Explanation

Dividing the peak flow by the allowable fraction of capacity gives 3.5 divided by 0.70, or 5.0 mgd. Sizing to this capacity keeps the peak flow at or below the target depth of flow.

Question 34Wastewater Sources, Characteristics, and Flow

Why are residential sanitary sewer flows typically higher during the morning hours than during the late-night hours?

  1. Storm drains discharge only in the morning
  2. Residents use water for bathing and household tasks before work Correct answer.
  3. Industrial pretreatment discharges are timed to the morning
  4. Groundwater levels rise each morning

Explanation

Domestic water use follows daily habits, with morning bathing, laundry, and kitchen use creating a predictable diurnal peak. Late-night flows drop to a minimum because household water use falls off.

Question 35Wastewater Sources, Characteristics, and Flow

Which parameter is used to express the strength of wastewater in terms of the oxygen required to oxidize both organic and ammonia nitrogen compounds?

  1. Total dissolved solids
  2. Total organic carbon
  3. Total suspended solids
  4. Total oxygen demand Correct answer.

Explanation

Total oxygen demand represents the oxygen needed to fully oxidize both carbonaceous and nitrogenous material in the sample. It is distinct from BOD, which is measured over a defined incubation period with biological oxidation.

Question 36Wastewater Sources, Characteristics, and Flow

What is the primary purpose of a grit removal facility at the head of a treatment plant?

  1. To remove dissolved organic matter that causes odor
  2. To remove heavy inorganic solids that would damage downstream equipment Correct answer.
  3. To thicken waste activated sludge
  4. To disinfect the incoming flow before primary treatment

Explanation

Grit channels and chambers remove dense, abrasive inorganic material such as sand and small stones that would otherwise erode pumps and clog downstream equipment. Organic material passes on to primary treatment.

Question 37Wastewater Sources, Characteristics, and Flow

A sewer district measures an average dry-weather flow of 2.0 mgd and an average wet-weather flow of 2.9 mgd. What percentage of the dry-weather flow is attributable to inflow and infiltration?

  1. 145 percent
  2. 45 percent Correct answer.
  3. 69 percent
  4. 31 percent

Explanation

The difference between wet- and dry-weather flow is 0.9 mgd. Dividing 0.9 by the 2.0 mgd dry-weather flow gives 0.45, or 45 percent.

Question 38Wastewater Sources, Characteristics, and Flow

Which type of flow is generated by commercial establishments such as restaurants and laundries and must be accounted for in sewer design?

  1. Groundwater recharge
  2. Storm inflow
  3. Base infiltration
  4. Commercial flow Correct answer.

Explanation

Commercial flow is wastewater discharged from business activities such as food service and laundry operations and is estimated separately from residential flow in design calculations. It can be significant and variable depending on the type of business.

Question 39Wastewater Sources, Characteristics, and Flow

Why is a minimum self-cleansing velocity typically specified for gravity sanitary sewers?

  1. To increase the dissolved oxygen in the wastewater
  2. To reduce the hydraulic capacity of the pipe
  3. To prevent groundwater from entering the pipe
  4. To limit the buildup of solids and prevent septic conditions Correct answer.

Explanation

A minimum velocity, commonly about 2 feet per second at design flow, keeps solids suspended and moving so they do not deposit and create blockages or septic conditions. Excessive velocity is avoided to limit pipe abrasion.

Question 40Wastewater Sources, Characteristics, and Flow

Which of the following best describes the difference between sanitary sewage and combined sewage?

  1. Sanitary sewage is always discharged without treatment
  2. Sanitary sewage contains no organic matter
  3. Sanitary sewage carries domestic and industrial waste, while combined sewage also carries storm runoff Correct answer.
  4. Combined sewage is treated to a lower standard than sanitary sewage

Explanation

Sanitary sewers carry domestic and industrial wastewater only, whereas combined sewers carry both wastewater and storm runoff in a single pipe. Combined systems can overflow during storms when flows exceed capacity.

Question 41Wastewater Sources, Characteristics, and Flow

A flow meter records 250,000 gallons over an 8-hour period. What is the average flow rate in gallons per minute?

  1. 312 gpm
  2. 2,083 gpm
  3. 1,042 gpm
  4. 521 gpm Correct answer.

Explanation

Dividing 250,000 gallons by 480 minutes (8 hours times 60) gives about 521 gallons per minute.

Question 42Wastewater Sources, Characteristics, and Flow

Why does wastewater temperature matter to the operation of a collection system and treatment plant?

  1. It sets the design velocity of the sewer
  2. It controls the amount of grit that settles
  3. It affects biological activity and the potential for septic conditions Correct answer.
  4. It determines the chlorine residual required for disinfection

Explanation

Warm wastewater supports faster biological activity and can promote septic conditions and sulfide generation in the collection system, while temperature also influences treatment process performance. Other parameters such as chlorine dose and velocity are governed by separate criteria.

Question 43Wastewater Sources, Characteristics, and Flow

Which method is most commonly used to estimate the population served by an existing sanitary sewer for flow projections?

  1. Measuring the diameter of the trunk sewer
  2. Counting manholes along the sewer
  3. Reviewing census data and land use plans Correct answer.
  4. Sampling the wastewater for pH

Explanation

Population projections are developed from census records, land use planning documents, and zoning information. These figures are then combined with per capita flow rates to estimate design flows.

Question 44Wastewater Sources, Characteristics, and Flow

A community has a dry-weather flow of 1.5 mgd and a wet-weather flow of 3.0 mgd. What is the peaking factor for wet-weather flow relative to dry-weather flow?

  1. 0.5
  2. 1.5
  3. 2.0 Correct answer.
  4. 4.5

Explanation

Dividing the wet-weather flow of 3.0 mgd by the dry-weather flow of 1.5 mgd gives a peaking factor of 2.0. This factor is used to evaluate hydraulic capacity during storms.

Question 45Collection System Design, Plans, and Specifications

A gravity sewer is designed to flow at what approximate depth under average design flow conditions, so that the pipe provides ventilation and keeps solids moving?

  1. Completely full
  2. One-quarter full
  3. Three-quarters full
  4. One-half full Correct answer.

Explanation

Standard practice sizes gravity sanitary sewers so average design flow runs near half-full, which keeps velocities adequate for solids transport while leaving freeboard and airspace for ventilation and surge flows.

Question 46Collection System Design, Plans, and Specifications

What is the primary purpose of specifying a minimum self-cleansing velocity in a gravity sewer design?

  1. To control peak inflow
  2. To keep solids suspended and prevent deposition Correct answer.
  3. To limit pipe abrasion
  4. To reduce hydrogen sulfide formation

Explanation

A minimum velocity (commonly about 2 ft/s at design flow) keeps settleable solids in suspension so they are carried to the treatment facility rather than depositing and causing blockages.

Question 47Collection System Design, Plans, and Specifications

In sewer profiles, why is a drop (vertical offset) sometimes placed at a manhole where pipe size increases?

  1. To align the pipe crowns at the same elevation Correct answer.
  2. To provide a location for a flow meter
  3. To slow flow before the larger pipe
  4. To match the invert of the outgoing pipe to the crown of the incoming pipe

Explanation

When a smaller pipe discharges into a larger one, a drop at the manhole is often used to keep the crowns (or the hydraulic grade) aligned so the larger pipe does not back up flow in the smaller pipe.

Question 48Collection System Design, Plans, and Specifications

A designer needs to express the slope of a sewer as a percentage. A pipe drops 2.5 feet over a run of 500 feet. What is the slope?

  1. 0.05 percent
  2. 2.0 percent
  3. 0.5 percent Correct answer.
  4. 5.0 percent

Explanation

Slope as a percentage equals rise over run times 100, so 2.5 divided by 500 equals 0.005, or 0.5 percent.

Question 49Collection System Design, Plans, and Specifications

Which document typically establishes the owner's functional and performance requirements and forms the basis for detailed design by the engineer?

  1. Operation and maintenance manual
  2. Record drawings
  3. Basis of design report Correct answer.
  4. Punch list

Explanation

The basis of design report documents design criteria, assumptions, and performance requirements that guide and justify the detailed design.

Question 50Collection System Design, Plans, and Specifications

What is the main reason standard specifications include approved materials lists and reference standards such as ASTM or AWWA designations?

  1. To ensure materials meet recognized quality and testing requirements Correct answer.
  2. To shorten the construction schedule
  3. To limit bidding to local suppliers
  4. To reduce the number of drawings required

Explanation

Referencing consensus standards ties material quality, testing, and acceptance to recognized industry criteria, giving the owner assurance that specified products meet minimum performance requirements.