Incident Investigation: Worker Pulled Into Ground by Quicksand Condition | WorkSafeBC

Introduction

This tutorial focuses on conducting a risk assessment based on the incident of a worker being pulled into quicksand at a construction site, as discussed in the WorkSafeBC video. Understanding the risk factors associated with such incidents is crucial for preventing similar occurrences in the future. This guide will walk you through evaluating risks, assessing existing controls, and determining their effectiveness according to the hierarchy of control.

Step 1: Identify Hazards

• Define the Hazard: Recognize the quicksand condition as a significant hazard in excavation work.
• Gather Data: Consult geotechnical reports and borehole data to evaluate soil conditions. In this case, inadequate data contributed to the incident.
• Document Findings: Keep a record of all identified hazards and conditions that may lead to quicksand formation.

Step 2: Assess Risks

• Determine Severity (R): Evaluate how severe the consequences could be if a worker encounters quicksand. For instance, potential injuries could range from minor to life-threatening.
• Evaluate Probability (P): Consider the likelihood of quicksand conditions occurring based on environmental factors and worksite conditions.
• Calculate Risk Value (R x P): Use the formula to quantify the risk:
  • If Severity is rated 4 (Severe) and Probability is rated 3 (Likely), then Risk Value = 4 x 3 = 12.

Step 3: Analyze Existing Controls

• Review Control Measures: Examine current safety measures in place, such as dewatering systems and shoring practices.
• Hierarchy of Control: Evaluate whether existing controls follow the hierarchy of control principles:
  1. Elimination: Remove the hazard.
  2. Substitution: Replace with a less hazardous option.
  3. Engineering Controls: Implement physical changes to reduce risk (e.g., improved shoring).
  4. Administrative Controls: Establish procedures and training.
  5. Personal Protective Equipment (PPE): Provide necessary gear, but recognize this is the least effective option.
• Determine Effectiveness: Assess if these controls adequately reduce risks to acceptable levels.

Step 4: Recommend Improvements

• Enhance Data Collection: Improve geotechnical investigation methods to gather comprehensive information.
• Upgrade Dewatering Systems: Consider alternative systems that provide better management of ground conditions.
• Training and Awareness: Provide training for workers on recognizing hazards and emergency procedures related to quicksand conditions.

Conclusion

Risk assessments are essential in ensuring a safe working environment, especially in high-risk areas like excavation sites. By identifying hazards, assessing risks, analyzing existing controls, and recommending improvements, you can significantly reduce the likelihood of accidents like the one experienced in the video. Regular reviews and updates of safety measures will help maintain a safer workplace. Consider implementing these steps in your own assessments to promote health and safety effectively.