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Trench Rescue Guidelines Quiz
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Trench Rescue Guidelines Quiz

Created by
@LighterElm

Questions and Answers

What is the primary hazard that must always be considered during trench rescue operations?

  • Unstable soil conditions
  • Improper or inadequate shoring
  • Temporary stability disturbance
  • Additional collapse (correct)

    • What is the definition of a trench according to this policy?

  • Any manmade cut, cavity, trench or depression in an earth surface, formed by earth removal which is less than or equal to five (5) feet in depth
  • Any manmade cut, cavity, trench or depression in an earth surface, formed by earth removal which is greater than or equal to ten (10) feet in depth
  • Any manmade cut, cavity, trench or depression in an earth surface, formed by earth removal which is greater than or equal to five (5) feet in depth (correct)
  • Any manmade cut, cavity, trench or depression in an earth surface, formed by earth removal which is greater than or equal to twenty (20) feet in depth

    • What is the significance of the width of a trench in this policy?

  • The width determines the type of shoring required
  • The width must be less than or equal to 15 feet measured at the bottom (correct)
  • The width is irrelevant in trench rescue operations
  • The width determines the potential for collapse

    • What is the purpose of shoring in trench rescue operations?

    <p>To prevent cave-ins and collapses</p> Signup and view all the answers

    What is the significance of vibration in trench rescue operations?

    <p>It can cause additional collapse</p> Signup and view all the answers

    Why do cave-ins and collapses generally occur in trench rescue operations?

    <p>Because of all of the above</p> Signup and view all the answers

    What is the role of the IDOL and OSHA criteria in trench rescue operations?

    <p>They must be followed by all rescue operations</p> Signup and view all the answers

    What is the significance of the temporary stability in trench rescue operations?

    <p>It can be disturbed by removing soil or debris, by adding weight near the edge of an open cut, by vibration, rain, or simply by the passage of time</p> Signup and view all the answers

    What is the minimum depth before an additional brace must be added?

    <p>2½ feet</p> Signup and view all the answers

    Why should personnel be rotated during trench rescue operations?

    <p>To prevent fatigue and maintain vigorous digging</p> Signup and view all the answers

    What is the procedure for removing personnel from a trench during a rescue operation?

    <p>Remove all personnel before raising the patient</p> Signup and view all the answers

    What is the policy for all employees assigned to the Fire Department during trench or excavation rescue operations?

    <p>Conform to requirements described in CFR OSHA 1926.650</p> Signup and view all the answers

    What is the classification of soil with an unconfined compressive strength of 1.5 tons per square foot or greater?

    <p>Type A</p> Signup and view all the answers

    Why are all soils considered 'TYPE C' soils in the Fire Department policy?

    <p>To take a more conservative approach to soil conditions</p> Signup and view all the answers

    What must be done with all underground installations during trench rescue operations?

    <p>Locate and safeguard them as necessary</p> Signup and view all the answers

    What is the exception to the requirement for shoring in trench rescue operations?

    <p>When the operation is a body recovery, not a rescue, and sloping is possible</p> Signup and view all the answers

    Which of the following statements is TRUE regarding the use of heavy machinery during a trench rescue operation?

    <p>Heavy machinery should not be used for digging within the trench during a rescue operation.</p> Signup and view all the answers

    What is the minimum distance that unnecessary equipment should be parked away from a trench?

    <p>300 feet</p> Signup and view all the answers

    Which of the following is NOT a requirement for trench shoring?

    <p>Shoring must be installed from the bottom up.</p> Signup and view all the answers

    What is the minimum distance that spoil piles and other materials should be moved away from the trench?

    <p>2 feet</p> Signup and view all the answers

    What is the maximum depth a rescuer should go below the last good crossbrace?

    <p>Waist deep</p> Signup and view all the answers

    Which of the following is the recommended material to protect the edges of a trench?

    <p>Plywood or planking</p> Signup and view all the answers

    What is the maximum distance between top cross braces in trench shoring?

    <p>2 feet</p> Signup and view all the answers

    What is the minimum distance between bottom cross braces in trench shoring?

    <p>2.5 feet</p> Signup and view all the answers

    What is the minimum height that shoring uprights must extend above the surface of the trench?

    <p>2 inches</p> Signup and view all the answers

    How should shoring be removed after installation?

    <p>From the top to the bottom</p> Signup and view all the answers

    What is the maximum distance allowed between cross braces?

    <p>4 feet</p> Signup and view all the answers

    When setting shores, what is the maximum depth a worker can be relative to the lowest cross brace?

    <p>Waist deep</p> Signup and view all the answers

    What is the minimum distance required from the bottom of the trench to the closest cross brace?

    <p>2.5 feet</p> Signup and view all the answers

    What is the maximum spacing allowed for shoring uprights, excluding timber shores?

    <p>4 feet</p> Signup and view all the answers

    Which construction tables must all timber shore systems comply with?

    <p>OSHA guidelines</p> Signup and view all the answers

    What is the maximum distance that cross braces must be from the top of the trench?

    <p>2 feet</p> Signup and view all the answers

    What is the minimum distance a ladder must extend above the highest point of a trench wall or protective device?

    <p>3 feet</p> Signup and view all the answers

    What is the maximum lateral travel distance permitted before a ladder must be relocated?

    <p>25 feet</p> Signup and view all the answers

    In what scenario must employees wear warning vests or other high-visibility clothing?

    <p>When exposed to traffic</p> Signup and view all the answers

    What is the primary safety precaution when operating mobile equipment near a trench where the operator's view is obstructed?

    <p>Using barricades, stop logs, or hand signals from an observer</p> Signup and view all the answers

    What safety procedures must be followed when a hazardous atmosphere is suspected in a trench deeper than 4 feet?

    <p>The atmosphere must be tested for oxygen deficiency, flammability, and toxicity</p> Signup and view all the answers

    What are the primary methods for preventing a trench from caving in when water accumulation occurs?

    <p>Using specialized bracing systems and removing accumulated water</p> Signup and view all the answers

    In what situation must bracing, shoring, or underpinning be used?

    <p>When the stability of adjacent structures is affected</p> Signup and view all the answers

    What is the primary safety concern addressed by the rule prohibiting individuals from standing beneath loads handled by lifting or digging equipment?

    <p>Preventing potential falling objects</p> Signup and view all the answers

    Study Notes

    Trench Rescue Guidelines

    • Trench rescue operations are dangerous and require special considerations to ensure safe and effective management.
    • A trench is defined as a man-made cut, cavity, or depression in an earth surface, greater than or equal to 5 feet in depth, and with a width not greater than 15 feet (measured at the bottom).

    Trench Safety Precautions

    • Never enter an unshored trench.
    • Park necessary equipment at least 100' away, and unnecessary equipment at least 300' away.
    • Stop all traffic within 300' and keep all persons out of an unsafe trench.
    • Monitor and vent trench atmosphere, or wear airpacks if air quality is dangerous.
    • Keep non-essential personnel away from trench walls.
    • Move spoil pile and any other material at least 2 feet from trench.
    • Protect edges of trench with plywood or planking.
    • Do not allow the use of heavy machinery for digging within the trench during a rescue operation.
    • Personnel working in trench should wear bunker boots, helmets, and gloves.

    Shoring Guidelines

    • Inform sheeting (with 2"x 6" boards attached) must be used whenever airshores or hydraulic shores are used.
    • Sheeting must extend 2" above the edge of the trench and must extend to the bottom of the trench.
    • Solid sheeting is required with no gaps between sheeting.
    • Hydraulic and air shores must be installed according to manufacturer's tabulated data and specifications.
    • Damaged shoring must be evaluated by scene safety officer regarding its use.
    • Shoring must be installed from the top down, with no rescuer going below waist deep past the last crossbrace installed.

    IDOL/OSHA Regulations

    • All employees assigned to the Department must conform with IDOL/OSHA requirements for trench or excavation rescue operations.
    • Employee safety must always come first.
    • Soil conditions are classified as Type A, B, or C, with Type C being the most conservative approach.
    • All underground installations must be located and safeguarded as necessary.
    • A ladder must be located in all trenches 4 feet or deeper, extending 3 feet above the top of the highest trench wall or protective device.
    • Exposed employees shall wear high-visibility vests or clothing.
    • No one is permitted underneath loads handled by lifting or digging equipment.
    • Personnel are required to stand away from any vehicle being loaded or unloaded.

    Special Considerations

    • If a hazardous atmosphere is suspected or exists within the trench, it must be tested prior to employees entering the trench.
    • If a hazardous or deficient atmosphere exists, employees must be protected with appropriate respirators or ventilators.
    • If water accumulation occurs in the trench, it must be protected from cave-in with special systems or removed with equipment.
    • If the stability of adjacent structures is affected, systems such as bracing, shoring, or underpinning must be used.

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    Test your knowledge of the Hoffman Estates Fire Department's Standard Operating Guidelines for Trench Rescue operations, effective January 1, 2022.

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