• Hour Meter Reading 
  • Date 

  • POWER OFF CHECKS

  • OKNON/A
    a) Track Shoes/Wheels & Tires
    b) Track Links
    c) Rollers/Sprockets/Idler wheels
  • OKNON/A
  • OKNON/A

  • OKNON/A
    a) Belts/Hoses
    b) Cables/Wires
    c) Debris
  • OKNON/A
    a) Terminals tight
    b) Clean/Dry/Secure
  • OKNON/A
    a) Cylinders/Rods
    b) Hoses/Lines/Fittings
    c) Pins/Locks

  • OKNON/ALow LevelHigh LevelLeaks
    a) Engine oil
    b) Engine coolant
    c) Hydraulic oil
    d) Fuel/Battery
  • OKNON/A
    a) Cab/Glass/Doors
    b) Emergency Exit
    c) Entry/Exit steps
    d) ROPS/FOPS/TOPS
    e) Counterweight/Counterweight bolt(s)
    f) Fire Extinguisher/Suppression System

  • OKNON/A
    a) Boom/Dipper/Attachment
    b) Articulated joints

  • POWER ON CHECKS

  • OKNON/A
  • OKNON/A
  • OKNON/A

  • OKNON/A
  • OKNON/A
  • OKNON/A

  • OKNON/A
    a) Drive – forward/reverse
    b) Steer – left/right
    c) Turret rotate
    d) Bucket/Boom/Dipper/Attachment
    e) Accessories

  • OKNON/A
  • OKNON/A
  • OKNON/A

  • GENERAL

  • OKNON/A
  • OKNON/A
  • OKNON/A
  • OKNON/A

  • WORKPLACE INSPECTION

  • OKNON/A
  • OKNON/A
  • OKNON/A

  • OKNON/A
  • OKNON/A
  • OKNON/A

  • OKNON/A
  • OKNON/A
  • OKNON/A

  • Report any problems found to your supervisor/employer. ALWAYS lock/tag-out unsafe equipment.

  • Operator’s initials:Alternative operator’s initials: 
JF Murray

Excavating and Trenching


GENERAL

Protecting workers from fatalities and injuries associated with excavating and trenching.          

APPLICATION

 Worker injuries and deaths resulting from trench wall collapse are common and completely preventable. The material removed from the ground to form a hole, trench or cavity is extremely heavy. It may weigh more than 1476 kilograms/cubic metre (100 pounds/cubic foot), the equivalent weight of a car in a space less than the size of the average office desk. Wet soil, rocky soil or rock is usually heavier.

 

Workers must be protected from cave ins or sliding materials that could cause personal injury. The listed alternatives reflect industry practice and provide an employer with some measure of flexibility in selecting the most appropriate method for the job. Cutting back or sloping the upper walls so that the remaining vertical height is no more than 1.5 metres above the floor of the excavation, installing temporary protective structures such as the trench shields.

 

An employer must not require a worker to enter, and a worker must not enter, a trench that is deeper than 1.5 metres (4 feet 10 inches) unless it is properly cut back, shored using the methods and materials specified in this Part, or protected by a trench box or cage designed by a professional engineer.

 

An employer must not require a worker to enter, and a worker must not enter, an excavation deeper than 1.5 metres (4 feet 10 inches) and work closer to the wall than the depth of the excavation unless the wall is properly cut back, shored or protected by a temporary protective structure.

 

No one can predict accurately if an excavation is safe to enter without a proper support structure being provided. A worker does not have to completely buried in soil to be seriously injured or killed. There are cases where workers have been only buried up to their waist and have died as a result of the significant pressures exerted by the soil on their bodies.

PROTECTIVE  MECHANISMS

 Safe work procedure

 Manufacturer’s  specifications

PPE

ERP (Emergency Response Plan)

SELECTION AND USE

As per safe work procedure Manufacture’s  specifications Provincial OH&S Legislation Excavation and Tunnelling

SUPERVISOR   RESPONSIBILITY

Supervisors are responsible to facilitate and/or provide proper instruction to their workers on protection requirements and training.

Work site inspection Selection of equipment

Compliance and enforcement

WORKER  RESPONSIBILITY

 To follow outlined task guidelines while complying with the company’s rules

  1. Workers shall not complete this task unless worker contains a valid Ground Disturbance Certificate and deemed competent and qualified to complete task by
  2. Complete 360 walk around inspection of work location
  3. Excavations in or near “back filled” or previously excavated ground are especially dangerous since the soil is loose and does not provide sufficient support with in itself
  4. Ground water and seepage increases the possibility of a cave-in or failure The increases the possibility of cave-ins or failure situation. The increased water and seepage increases the possibility of a cave-in or failure situation. The increased water pressure exerted on the soil can be the final factor causing the trench or excavation walls to collapse.
  5. Natural freezing is subject to changing temperature and weather conditions and cannot be Even if the soil is frozen to a specified depth, fluctuating temperatures could result in unexpected or unplanned thawing of surface layers. As such, the structural integrity of the excavation could be compromised and the risk to workers significantly increased. Natural freezing as a means of soil stabilization is therefore unacceptable under any circumstances.
  6. An open excavation can present a serious hazard to workers and Almost any device that clearly marks, blocks or safeguards the opening is acceptable. Examples include barricades formed by aligned concrete blocks, erected snow fencing, guardrails, piles of excavated material or total enclosure/hoarding. In all cases the solution must be effective and its purpose clearly understood by workers.
  7. Heavy equipment and spoil piles of soil should not be allowed within 2 metres of the edge of the uppermost bench. Vibration caused by construction equipment may cause instability of the bench
  8. If walls of an excavation in soft, sandy or loose soil are cut back, they must be sloped from the bottom of the excavation and the walls must be at an angle of not less than 45 degrees (measured from the vertical).
  9. A safe point of entry and exit be located within 8 metres of any worker in a trench that is more than 5 metres deep.
  10. Water creates a hazard since it can weaken excavation walls, increasing the potential of slope failure or complete The presence of water can also create poor under‐foot conditions for workers, resulting in possible slips, trips and falls. In the worst case, accumulated water presents a drowning hazard. The employer must therefore control the accumulation of water and ensure that workers do not enter an excavation until hazardous accumulations are eliminated.
  11. A safe means of entering or leaving an excavation could include a ladder, scaffold or a mechanical device such as a It could also include appropriate sloping of the ground or soil so that a worker can safely walk into or out of the excavation.
  12. Even if the planned disturbance lies more than 30 metres away from a buried facility, the operator or licensee of a pipeline right‐of‐way must be contacted if the disturbance is to take place within that pipeline right‐of‐ The owner or licensee’s approval must be obtained before any ground disturbance
  13. The “hand expose zone” is the zone lying within 1 metre of each side of the locate marks that identify the location of the buried Before allowing mechanical excavation equipment to be used within this zone, the employer must ensure that the buried facility is exposed to sight by hand digging, a non‐destructive technique acceptable to the owner of the buried facility, or an equivalent method.
  14. Workers must be protected from cave ins or sliding materials that could cause personal The listed alternatives reflect industry practice and provide an employer with some measure of flexibility in selecting the most appropriate method for the job. Cutting back or sloping the upper walls so that the remaining vertical height is no more than 1.5 metres above the floor of the excavation, installing temporary protective structures such as the trench shields
  15. Hard compact soil- the walls of the excavation must be sloped to within 5 metres of the bottom of the excavation at an angle of not less than 30 degrees measured from the vertical
  16. Likely to crack or crumble soil/ soft, sandy or loose soil – the walls of the excavation must be sloped to within 1.5 metres of the bottom of the excavation at an angle of not less than 45 degrees measured from the vertical
  17. Benching can be a safe alternative to the straight cutting back of excavation walls in hard and compact, and likely to crack or crumble Benching is not acceptable for soft, sandy or loose soil. The rise and run for hard and compact soil should be at least 1 Vertical: 3⁄4 Horizontal (or flatter) with a maximum rise of 1.2 metres. The maximum unsupported vertical cut at the base is 1.2 metres rather than the 1.5 metres allowed by section 451 if the walls are sloped. The run of the first bench must be twice that of the succeeding benches. This wide first bench provides a more stable slope base
  18. The distance between the edge of the excavation and the leading edge of any spoil pile must be at least 1 metre.  The slope of the spoil pile can not exceed 45 degrees from the horizontal. These measures are intended to reduce the possibility of the spoil pile slumping into excavation. Spoil pile materials have rolled into excavations as a result of natural settling and daytime warming of frozen excavated material. Spoil piles should also be located away from the edge of the excavation because the weight of the excavated materials can exert unnecessary pressure on the walls if the excavation. Such pressure can cause excavation walls to collapse.

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Document name: Excavating and Trenching
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October 14, 2017 9:20 am MDTExcavating and Trenching Uploaded by Michelle Bryan - [email protected] IP 204.237.80.39
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