Underground Utility Strike Prevention

Date: 2025-11-24

Duration: [DURATION] minutes

Presenter: [PRESENTER NAME]

Location: [LOCATION]

Objective

To provide safety guidelines and procedures for preventing underground utility strikes during excavation and construction activities.

Introduction

It is crucial to know the location of underground utility lines on job sites to prevent ruptures that can lead to serious injuries or death. This toolbox talk will cover the steps to take to identify and avoid underground utilities. [1]

Key Points

Importance of Calling Before Digging: Contacting the local One-Call center is essential to identify and mark underground utilities before excavation. This helps prevent accidental damage and ensures worker safety. [3]
Understanding Utility Markings: Knowing the color codes for different utilities is crucial for safe excavation. Red indicates electric lines, yellow indicates gas lines, and so on. Always verify the markings before digging. [4]
Safe Excavation Practices: Excavate carefully, especially near marked utilities. Use hand digging within 2 feet of marked lines to avoid damage. Support any exposed utilities to prevent breaks or falls. [1]
Emergency Response: In the event of a utility strike, evacuate the area immediately and report the incident to your supervisor and the utility company. For gas leaks, also contact the fire department. [1]

Hazard Identification

Identifying potential hazards before starting any excavation work is essential for preventing underground utility strikes.

Striking an electrical power cable: Electrocution, severe burns, explosion, fire. [1]
Damaging a gas line: Gas leak, explosion, fire, asphyxiation. [1]
Hitting a water or communication line: Flooding, service disruption, property damage.
Unstable excavation: Trench collapse, worker injury or death.

Control Measures

Call Before You Dig: Contact the local One-Call center (e.g., 811) to notify utilities before any excavation. Allow them time to mark the locations of their underground facilities. [3]
Review Utility Markings: Understand the color codes used for marking different types of utilities (e.g., red for electric, yellow for gas, blue for water). [1]
Hand Excavation: When working within 2 feet of marked utilities, excavate by hand to avoid damaging the underground infrastructure. [1]
Support Exposed Utilities: If underground utilities are exposed during excavation, provide adequate support to prevent them from falling or breaking. [3]
Maintain Safe Sloping and Shoring: For excavations deeper than 4 feet, implement sloping, benching, or shoring systems to prevent trench collapse.

Personal Protective Equipment (PPE) Requirements

Hard Hat: Always wear a hard hat to protect your head from falling objects and potential impacts.
Safety Glasses: Use safety glasses to protect your eyes from dust, debris, and other potential hazards. [5]
Work Gloves: Wear work gloves to protect your hands from cuts, abrasions, and other injuries.

Real-World Example or Case Study

A construction crew used an auger to dig a hole and hit a small plastic gas line. Escaping gas reached a nearby building and ignited, resulting in four fatalities, 15 injuries, and significant property damage. This incident highlights the importance of identifying and avoiding underground utilities. [1]

Group Discussion

Discuss the following questions:

What color markings indicate gas lines?
What is the first step you should take before digging?
How close to a marked utility line should you stop using mechanical equipment?

Emergency Procedures

If a utility line is struck, immediately evacuate the area.
Report the incident to your supervisor and the utility company. [1]
If it is a gas line, also call the fire department. [1]

Questions and Answers

Here are some common questions related to underground utility safety:

Q: How accurate are the utility markings?

A: Utility markings are accurate within two feet either side of the line. Exercise caution when working closer than five feet to marked lines. [2]

Q: What do the different colors of USA markings mean?

A: Red indicates electric lines, yellow indicates natural gas/liquid petroleum lines, blue indicates water lines, and orange indicates communication lines. [4]

Summary

Recap of main points:

Always call before you dig to identify underground utilities. [3]
Excavate carefully, especially near marked utilities.
Report any utility strikes immediately. [1]

Action Items

Specific actions participants should take:

Always call 811 before any excavation work.
Visually identify and understand all utility markings on site.
Use safe digging practices, including hand excavation near marked utilities.

Remember: Dig Safe: Know What's Below!

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