Dewatering Operations

Scope and Purpose

Dewatering operations for excavations including pump selection, monitoring and water management. This safe work procedure establishes the minimum safety requirements for Dewatering Operations operations. It applies to all workers, contractors and visitors who may be involved in or exposed to these activities.

Hazard Identification

• Trench collapse and cave-in burial
• Contact with underground utilities (gas, electric, water)
• Falls into excavation
• Struck-by from heavy equipment
• Hazardous atmosphere in deep excavations
• Water accumulation and flooding

Required PPE

Key Procedure Steps

1. Review this safe work procedure and ensure all workers understand the scope and hazards before starting.
2. Conduct a pre-task hazard assessment (tailboard/toolbox talk) specific to the work area and conditions.
3. Inspect all required PPE and equipment. Remove any defective items from service immediately.
4. Establish the work area with appropriate barricades, signage and access controls.
5. Perform the task following the step-by-step instructions in the full procedure document.
6. Monitor conditions continuously. Stop work if conditions change or new hazards are identified.
7. Clean up the work area, properly store equipment and complete all required documentation.

Training Requirements

All workers performing Dewatering Operations activities must complete task-specific training before beginning work. Training must cover hazard recognition, PPE selection and use, emergency procedures and the steps in this SWP. Refresher training is required annually or whenever the procedure is updated. Competency must be verified by a qualified supervisor before workers are authorized to perform these tasks independently.

Regulatory References

• OSHA 29 CFR 1926 Subpart P - Excavations
• CSA Z460 - Control of Hazardous Energy
• Local one-call utility locate requirements
• OSHA Soil Classification Standards