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excavating into the side of a hill

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Toolbox Talk: Excavating into the Side of a Hill

Date: [DATE] Duration: [DURATION] minutes Presenter: [PRESENTER NAME] Location: [LOCATION]

Objective

The objective of this toolbox talk is to educate participants on the safe practices and potential hazards associated with excavating into the side of a hill. By the end of this session, participants should be able to identify common hazards, understand control measures, and implement safe work procedures.

Introduction

Excavating into the side of a hill presents unique challenges and risks, including the potential for landslides, equipment instability, and cave-ins. Understanding and mitigating these risks is crucial for ensuring the safety of all workers involved in excavation activities.

Presenter Note: Engage the audience by asking if anyone has personal experience related to excavating on slopes.

Key Points

  • Stability of the Excavation: Ensure that the excavation is stable and that the slope is properly supported to prevent cave-ins and landslides.
  • Equipment Operation: Operate machinery with caution on slopes to prevent tipping or rolling over. Avoid swinging the machine to the downhill side unless necessary [1].
  • Protective Systems: Use appropriate protective systems such as shoring or shielding to support the excavation walls [2].
  • Soil Classification: Properly classify the soil to determine the appropriate slope angle and protective measures [3].
  • Emergency Preparedness: Have a clear emergency plan in place in case of a landslide or equipment failure.

Hazard Identification

  • Landslides: Excavating into a hill can destabilize the soil, leading to landslides that can bury equipment and workers.
  • Equipment Instability: Operating machinery on a slope increases the risk of tipping or rolling over [1].
  • Cave-ins: Unsupported excavation walls can collapse, posing a serious risk to workers in the trench [2].

Presenter Note: Encourage participants to share any additional hazards they've encountered.

Control Measures

  • Engineering Controls: Use shoring, shielding, or benching to stabilize excavation walls [2].
  • Administrative Controls: Implement a site-specific safety plan and ensure all workers are trained in excavation safety.
  • Personal Protective Equipment (PPE): Ensure all workers wear appropriate PPE, including hard hats and high-visibility vests.

Safe Work Procedures

  1. Conduct a site assessment to identify potential hazards and determine soil type.
  2. Plan the excavation, including the slope angle and protective systems required.
  3. Use machinery safely, avoiding swinging to the downhill side unless necessary [1].
  4. Regularly inspect the excavation site for signs of instability or distress.
  5. Implement emergency procedures in case of a landslide or equipment failure.

Presenter Note: If possible, demonstrate the safe work procedure or use visual aids.

Personal Protective Equipment (PPE) Requirements

  • Hard Hats: Protect against falling debris and head injuries.
  • High-Visibility Vests: Ensure workers are visible to equipment operators.
  • Safety Boots: Provide protection against foot injuries from heavy equipment and debris.

Real-World Example or Case Study

Discuss a real-world incident where improper excavation practices led to a landslide, highlighting what went wrong and the lessons learned.

Presenter Note: Ask participants if they can relate this example to their own experiences.

Group Discussion

Discuss the following questions:

  1. What are the most common hazards you've encountered when excavating on a slope?
  2. How can we improve our current excavation safety practices?
  3. What additional training or resources would help you feel more prepared?

Presenter Note: Encourage active participation and facilitate the discussion.

Emergency Procedures

  1. Stop all work immediately if signs of instability are detected.
  2. Evacuate the area and move to a safe location.
  3. Contact emergency services if necessary.
  4. Report the incident to a supervisor and document the event.

Questions and Answers

Encourage participants to ask questions and provide answers to common questions related to the topic.

  • Q: What should you do if you notice signs of soil distress?

A: Stop work immediately and report it to a supervisor.

  • Q: How can you ensure machinery stability on a slope?

A: Avoid swinging the machine to the downhill side and use embankments to level the machine [1].

Summary

  • Ensure excavation stability and use protective systems.
  • Operate machinery safely on slopes.
  • Be prepared for emergencies and have a clear plan in place.

Action Items

  1. Review and update the site-specific safety plan for excavation activities.
  2. Conduct regular safety training sessions on excavation hazards and controls.
  3. Ensure all workers are equipped with the necessary PPE.

Remember: Safety is everyone's responsibility. Always prioritize safety over speed.

Report all hazards, near-misses, and incidents to your supervisor immediately.

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3 source record(s)

Sources used for this answer

[1] Rules for the Administration of the Oregon Safe Employment Act (Construction, Division 3, OSHA Oregon)

Page 695

Open source document

Source excerpt

## EXCAVATIONS ## OAR 437, DIVISION 3 ## CONSTRUCTION ## SUBDIVISION P - EXCAVATIONS [redacted phone] Adoption by Reference. In addition to, and not in lieu of, any other safety and health codes contained in OAR Chapter 437, the Department adopts by reference the following federal regulations printed as part of the Code of Federal Regulations, in the Federal Register: ## (16) Subdivision P - Excavations. - (a) 29 CFR 1926.650 Scope, application, and definitions applicable to this subdivision , published 10/31/89, FR vol. 54, no. 209, pp. [redacted postal code]-[redacted postal code]. (b) 29 CFR 1926.651 General requirements , published 8/9/94, FR vol. 59, no. 152, p. [redacted postal code]. - (c) 29 CFR 1926.652 Requirements for protective systems , published 10/31/89, FR vol. 54, no. 209, pp. [redacted postal code]-[redacted postal code]. - (d) Appendices A-F to Subdivision P, Excavations , published 10/31/89, FR vol. 54, no. 209, pp. [redacted postal code]-[redacted postal code]. These standards are available at the Oregon Occupational Safety and Health Division, Oregon Department of Consumer and Business Services, and the United States Government Printing Office. Stat. Auth.: ORS 654.025(2) and 656.726(4). Hist: Stats. Implemented: ORS 654.001 through 654.295. APD Admin. Order 5-1989, f. 3/31/89, ef. 5/1/89 (temp). APD Admin. Order 8-1989, f. 7/7/89, ef. 7/7/89 (perm). APD Admin. Order 14-1989, f. 7/20/89, ef. 8/1/89 (temp). APD Admin. Order 15-1989, f. 9/13/89, ef. 9/13/89 (perm). APD Admin. Order 16-1989 (temp), f. 9/13/89, ef. 9/13/89. OR-OSHA Admin. Order 2-1989, f. 10/17/89, ef. 10/17/89. OR-OSHA Admin. Order 3-1990, f. 1/19/90, ef. 1/19/90 (temp). OR-OSHA Admin. Order 7-1990, f. 3/2/90, ef. 3/2/90 (perm). OR-OSHA Admin. Order 8-1990, f. 3/30/90, ef. 3/30/90. OR-OSHA Admin. Order 13-1990, f. 6/28/90, ef. 8/1/90 (temp). OR-OSHA Admin. Order 19-1990, f. 8/31/90, ef. 8/31/90 (perm). OR-OSHA Admin. Order 27-1990, f. 12/12/90, ef. 2…

[2] Kobelco SK200-10, SK210LC-10 Operation Manual

Page 53

Open source document

Source excerpt

## DO NOT USE MACHINE WEIGHT FOR DIGGING OPERATION Do not use the machine weight to obtain power to dig. This could cause severe damage to the machine and its components. Before digging the hard bedrock, crack the hard bedrock into pieces by another method and then dig it. It will not damage the machine and result in more economical way. <!-- image --> ## OPERATING ON A SLOPE - · There is a risk of the machine losing the balance to tip/roll over when operating on a slope. Pay attention to the operation. - · When the machine is on a slope, do not swing the machine to the downhill side. - · If swinging is unavoidable, make an embankment for the machine to be as level as possible to swing on a slope. ## CALL BEFORE YOU DIG Confirm the local government or the public service company for locations of underground utilities of gas, water, phone, electrical power, and so forth before working in the area seemingly with these lines. Always inspect the worksite for evidence of unmarked utilities and piping and contact others if necessary. ［ <!-- image --> <!-- image --> 1

[3] Safety and Health Regulations for Construction (OSHA)

Page 105

Open source document

Source excerpt

## 29 CFR 1926 (OSHA) appendix apply when the design of sloping and benching protective systems is to be performed in accordance with the requirements set forth in §1926.652(b)(2). ## (b) Definitions. Actual slope means the slope to which an excavation face is excavated. Distress means that the soil is in a condition where a cave-in is imminent or is likely to occur. Distress is evidenced by such phenomena as the development of fissures in the face of or adjacent to an open excavation; the subsidence of the edge of an excavation; the slumping of material from the face or the bulging or heaving of material from the bottom of an excavation; the spalling of material from the face of an excavation; and ravelling, i.e., small amounts of material such as pebbles or little clumps of material suddenly separating from the face of an excavation and trickling or rolling down into the excavation. Maximum allowable slope means the steepest incline of an excavation face that is acceptable for the most favorable site conditions as protection against cave-ins, and is expressed as the ratio of horizontal distance to vertical rise (H:V). Short term exposure means a period of time less than or equal to 24 hours that an excavation is open. - (c) Requirements -(1) Soil classification. Soil and rock deposits shall be classified in accordance with appendix A to subpart P of part 1926. - (2) Maximum allowable slope. The maximum allowable slope for a soil or rock deposit shall be determined from Table B-1 of this appendix. - (3) Actual slope. (i) The actual slope shall not be steeper than the maximum allowable slope. - (ii) The actual slope shall be less steep than the maximum allowable slope, when there are signs of distress. If that situation occurs, the slope shall be cut back to an actual slope which is at least Ú 1 2 horizontal to one vertical ( Ú H:1V) less steep than the maximum allowable slope. 1 2 - (iii) When surcharge loads from stored material or equipment, operating e…

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