811 Locating & Underground Utilities Toolbox Talk

A free, ready-to-run toolbox talk for construction crews. Read it aloud at your morning huddle; it takes about ten minutes. Leer en español →

OSHA standard: 29 CFR 1926.651(b) · Arizona Blue Stake law (A.R.S. Title 40)

At a glance

• Call 811 before EVERY dig — it's free, and it's the law
• Wait for the marks, and respect the tolerance zone
• Hand-dig within 24 inches of any marked line
• Hit or nick a line? Stop, clear out, call it in — even if "nothing happened"

Introduction

Under every jobsite runs a grid nobody can see: gas, electric, fiber, water, sewer. Striking one means electrocution, explosion, flooding, or knocking out service to a neighborhood — and the strike usually comes from a "quick" dig someone didn't think needed a locate. Arizona law and OSHA both require utilities to be located before excavation. Today's talk covers the 811 process and how to dig around marked lines without finding one the hard way.

Before You Dig

• Call 811 (Arizona Blue Stake) at least two full working days before digging — every dig, including "just a couple feet down"
• Wait for the marks AND check the ticket covers your actual dig area; an expired ticket (15 working days in AZ) gets refreshed
• Know the colors: red = electric, yellow = gas/oil, orange = communications, blue = water, green = sewer, white = your proposed dig
• No marks where you expected some? Don't assume clear — call and confirm before breaking ground

Digging Near Marks

• The tolerance zone is the marked line plus 24 inches each side — inside it, hand tools or vacuum excavation only, no machine digging
• Expose the line by hand and support it before machine work continues nearby
• Marks are the operator's best estimate: depth is NEVER guaranteed, and lines wander
• Private lines (site lighting, irrigation, buildings to outbuildings) are NOT on the 811 ticket — ask the owner and check as-builts

If You Hit One

• Any contact counts — a nick in the coating of a gas line or cable jacket can fail catastrophically later; report every contact
• Gas strike: kill ignition sources, evacuate upwind, call 911 and the utility — do NOT try to plug or crimp the line
• Electric strike: nobody touches the machine or the trench; the operator stays put unless fire forces a hop-and-shuffle exit
• Report to the foreman and the utility even when nothing visibly happened

Key takeaways

• 811 before every dig, no exceptions
• Wait for the marks; refresh expired tickets
• Hand-dig the 24-inch tolerance zone
• Depth is never guaranteed — expose, don't assume
• Private lines aren't on the ticket — ask
• Report every contact, even a nick

Run this talk with crew sign-offs

This talk is part of the Safirst ONE toolbox talk library, in English and Spanish. Your foreman picks the talk in the app, the crew signs from their own phones by scanning a QR code, and the signed record files itself in your Docs Locker. Talk to Safirst to get it for your crews.

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