NGA 71: Operator Excavating and Backfilling in the Vicinity of a Pipeline (Critical AOC) Practice Test

These questions are part of the practice quiz. Start practicing

• Which statement correctly describes the difference between exposure and burial near a pipeline?
• When would a pavement segment require removal or shoring?
• Which type of line is typically marked purple in the field?
• If an underground structure prevents installation at those depths, what happens?
• How should piping with unknown contents in the Critical AOC be treated?
• Which statement best defines Emergency Excavation?
• What is the recommended method for exposing a pipeline within the Critical AOC?
• Color code used to indicate slurry and non-potable utilities is what?
• After excavation has started, how long is a location ticket valid?
• In trenching, what do the lifts refer to?
• Which two items must be present on the excavation site regarding documentation?
• Among color marks for underground utilities, which color denotes non-potable slurry lines?
• Unless otherwise specified, the tolerance zone is __ inches.
• What clearance should be maintained between underground facilities and mechanized equipment during excavation?
• What is the operator's primary concern if a pipeline is exposed during excavation?
• If a pipeline crossing is determined by the operator to be not safe, what is the proper action?
• Do you call 811 at the end of the job?
• What is the standard width of the tolerance zone if not specified by procedures?
• What is the primary purpose of shoring in trenches?
• Which of the following methods can be used to dig inside the tolerance zone?
• Before excavation, why should you contact 811?
• Which of the following describes the controls required in the Critical AOC around a pipeline?
• The tolerance zone around the pipe is equal to 2 feet plus half the pipe diameter. Which statement correctly reflects this distance?
• How should excavation equipment be maintained to reduce hazard near pipelines?
• When should backfilling happen?
• Who qualifies as authorized personnel on site for excavation near pipelines?
• Tracer wire is associated with which safety device?
• Backfilling provides what function?
• Before excavating near a pipeline, who must you notify and what process must you follow?
• If excavation is planned within 200 feet of a gas regulator or gate station, whom must be notified?
• A job brief should include which items?
• In utility terminology, what does the term 'facility' refer to?
• PPE is typically required when excavating near pipelines in a Critical AOC. Which set of PPE is appropriate?
• What is the purpose of initiating the one-call/811 locate process before excavation near pipelines?
• When should you postpone excavation?
• How should dewatering be managed near a pipeline?
• A ladder is required in a trench that has a depth of ? or deeper
• For excavation near a slurry line that is not potable, the marks should be which color?
• Sewer and storm drainage systems are identified by which color?
• Before entering a trench near a pipeline, what must the Competent Person verify?
• What material constitutes the 'lifts' used to backfill around the pipe?
• What are typical responsibilities of a Competent Person in trenching near pipelines?
• Which scenario would be considered an unplanned exposure?
• Which color is designated for slurry or non-potable line marks?
• How would you best describe the tolerance zone near underground utilities?
• If a third party is found working around transmission lines without a proper mark-out, what action should you take?
• What color is used to mark slurry/non-potable lines?
• What constitutes an operational pause in NGA 71?
• When verifying pipeline location in a Critical AOC, which sources should you use?
• Who should you directly notify when utility lines are involved?
• Which option best summarizes proper backfilling practice after pipe installation?
• What is a key purpose of using designated crossing mats when heavy equipment crosses over a pipeline?
• A hazardous leak requires which type of excavation?
• Which statement best defines the purpose of a Damage Prevention Program?
• In the Critical AOC, what is the recommended approach to confirm pipeline location before excavation?
• What are some indicators that a trench is not safe to enter near a pipeline?
• Proposed excavation or construction boundaries are marked with which color?
• What is the recommended depth above the pipe that the primary backfill should reach?
• Backfill is defined as which of the following?
• What is the role of the pipeline operator during excavation in the Critical AOC?
• Which concept includes one-call systems, notifying excavation, inspecting pipelines as examples?
• After a pipeline is exposed and located, what is the next required step before entering the trench near the pipeline?
• When working near a pipeline, how should heavy equipment be positioned relative to the line?
• What is the most common hazard during excavation?
• What are the causes of a trench cave-in?
• If installation at the prescribed depths is blocked by an underground structure, what must the service line be able to do?
• In utility marking, which color marks indicate a non-potable slurry line?
• Gas detectors near pipelines should trigger protective actions when which condition arises?
• If part of the pavement where the excavation is being performed becomes undetermined, what action must be taken for that portion?
• What is the required cover depth for streets or roads?
• When is hand digging required near a pipeline?
• If utility mark out is not legible or clear, what should you do?
• Among color marks for underground utilities, which color denotes non-potable slurry lines?
• What is the ultimate goal of NGA 71 training and practice tests?
• Which color label would you expect on lines carrying slurry that should not be consumed?
• What is an unplanned exposed facility?
• What is the purpose of maintaining records such as tickets, permits, daily logs, and gas detector readings in NGA 71 excavation work?
• Which measure helps prevent trench wall collapse near underground facilities?
• When is shoring mandatory?
• For benched excavations 20 feet or less in depth, what is the maximum allowable slope?
• Using a backhoe for compaction could result in poor compaction or ___.
• Primary backfill consists of what material and placement method around the pipe?
• In a pipeline work zone, which practice helps prevent unauthorized entry?
• What determines the horizontal to vertical ratio of the benched side?
• Which condition on excavation equipment must be addressed to maintain safe operation near pipelines?
• How should soil types near a pipeline impact excavation methods?
• The color used to indicate slurry or non-potable lines is which color?
• The excavator is the responsible party for preserving the mark out.
• Which sequence correctly describes crossing a pipeline with heavy equipment?
• What is the recommended action when adverse weather raises concerns about soil stability near a pipeline?
• What is the purpose of warning tape in relation to buried utilities?
• Which statement best indicates you are within a Critical AOC around a pipeline?
• What is the required cover depth on private property?
• What is the proper action regarding spoil management when excavating near a pipeline?
• What is the minimum required method for identifying a pipeline in a Critical AOC?
• Who makes the repairs in the event of a line strike, leak, or other AOC?
• How should you respond to incidental contact with a buried pipeline that does not cause damage?
• Which color is associated with Oil and Gas distribution and transmission?
• Which term is defined as Removal of earth by digging or scooping?
• Which statement about guarding against utility damage is correct?
• Location tickets are valid for a defined period before excavation starts. How long is that period usually?
• What is the recommended approach to backfill around a valve or T-fitting near a pipeline?
• Why is maintaining a minimum clearance between heavy equipment and an exposed pipeline essential?
• Which pair of cover depths is correct for private property and streets?
• What is the purpose of a protective shoring or shielding system in trenching near pipelines?
• Which statement best describes cave-ins?
• What is the purpose of establishing an exposure area when exposing a pipeline?
• During NGA 71 operations, how should near-miss incidents be documented and reported?
• In common utility color coding, what does the color red indicate?
• Excavation is defined as which of the following?
• Which of the following is a type of compaction equipment?
• Who should be notified if a near-miss incident occurs?
• Which method is considered non-destructive for exposing a pipeline within the Critical AOC?
• Which term refers to the requirement to identify buried utilities before digging?
• Type C soil is described as?
• Backfill aims to achieve which outcome?
• Which item should be included when documenting a near-miss incident?
• Why should you use caution digging in area of plastic pipes?
• Which soil type is an example of Type C?
• What responsibilities do a spotter have when excavating near a pipeline?
• How should backfilling be performed near a pipeline to protect it?
• What is the purpose of line crossing operations or crossing a pipeline with equipment?
• How do you keep a ditch from caving in?
• What action should be taken if a buried pipeline is hit during excavation?
• What is the purpose of a call-before-you-dig 811 ticket?
• Which color is used to mark municipal electric systems?
• What is the recommended action when weather conditions could affect soil stability near a pipeline?
• Which statement correctly defines exposure in the context of excavation near pipelines?
• What is the recommended approach to spoil disposal within the vicinity of a pipeline?
• What is the recommended trench width when working near a pipeline?
• Purple marks indicate which type of pipeline?
• How does National Grid classify soil type in this context?
• Which color would a contractor expect to see on slurry non-potable pipelines?
• What are the three components of a Job Safety Analysis (JSA) for NGA 71 operations?
• What term describes the initial backfill that is placed and hand-tamped around the pipe to about one foot above it?
• If soil from an excavation is unsuitable for backfill, what should you do?
• What is the proper action if a valve is unverified during backfill?
• What should be done if a pipeline is undermined during excavation?
• What is the recommended action if a pipeline leak is suspected during excavation?
• Proper compaction in each trench should be checked every ? feet.
• What should you do if utility markings are not legible?
• Which piece of equipment is inappropriate for work near a pipeline?
• A proper job brief should include which combination?
• What color are survey markings?
• Soil used for backfill should be clean and ___.
• How should excavation spoils be managed to protect a pipeline's integrity?
• If you are notified at 10:00 AM on Monday, you can begin excavation at 7:00 AM the following which day?
• What method is used to dig within the tolerance zone?
• Potable water is associated with which color?
• In color-coding for underground utilities, purple marks which type of line?
• How should signs and barricades be used near a pipeline work zone?
• Cable television is associated with which color?
• What is a key precaution to prevent damage when crossing a pipeline with equipment?
• Which term refers to the refilling of an excavated area with excavated material?
• How should backfilling be monitored to prevent damage to coating on a pipeline?
• If a valve is located but inaccessible because of backfill, what action should you take on site?
• Which entities could be facility owner?
• What is vacuum excavation and when should it be used?
• What signs of a potential pipeline leak should prompt immediate cessation of excavation?
• What is the primary purpose of NGA 71 and what does the term Critical AOC refer to in the context of excavating near pipelines?
• When should you call 811 before starting work?
• If utility markings are not legible, you should contact 811 Call Before You Dig and the __ the utility if known before excavating.
• If you discover buried facilities in the excavation area that are not yet marked, what should you do?
• If gas is released during excavation near a pipeline, what should you do?
• A Damage Prevention Program consists of which of the following?
• What is the primary role of a spotter in a Critical AOC?
• What is the proper approach to backfill around a pipeline to ensure it's adequate but not over-compact?
• One-Call System (811) is best described as which of the following?
• Loads must be distributed in what manner to prevent a possible break?
• Which of the following is used to mark a non-potable slurry line?
• To reach the Call Before You Dig Notification Center and start the utility marking process before excavation, you should dial:
• What color are proposed excavation markings?
• How far must the spoil pile be from the edge of the trench?
• Pipelines are subjected to stress from earth and other loads. How should these loads be applied?
• What color is used to mark non-potable slurry lines in the field?
• What must be on every excavation site?
• What records should be kept for NGA 71 excavation work?
• In trench safety, which condition most directly indicates the need for shoring?
• What is the size of the compaction layer?
• Do cave-ins pose the greatest risk to workers?
• What is the primary purpose of calling and notifying before digging?
• What is the recommended practice for temporary support in a trench near a pipeline?
• Why is a shutdown criterion important in NGA 71 operations?
• Who is the excavator?
• What is the role of gas detectors in NGA 71 work near pipelines?
• What action should be taken if trench conditions show movement or gas odor near a pipeline?
• What is a risk associated with over-compact backfill near a pipeline?
• How should you verify that a pipeline is properly located and not shifted between tickets?
• Emergency Excavation is best defined as which of the following?
• At what point should a trench be considered safe to work in near a pipeline?
• What should you be aware of regarding unmarked facilities during excavation?