And How to Protect Yourself Before You Dig

You pull the facility records. You study the drawings. You feel reasonably confident about what's underground.
Then the bucket breaks something that wasn't on any drawing.

It's not a fluke. It's not bad luck. It's a predictable consequence of trusting documents that were never designed to be accurate in the first place, and that degrade further with every passing year.

This is one of the most underappreciated risks in excavation work today. Contractors who understand it operate differently.

The Myth of the Accurate As-Built

An as-built drawing is supposed to document where utilities were actually installed, as opposed to where they were designed to go. In theory, the installing contractor updates the drawings after the job to reflect any field deviations.

In practice, this process is inconsistent at best and nonexistent at worst.

Field crews are busy. Change orders don't always make it back to the record set. Drawings get updated digitally while the physical set stays in a drawer. Or a contractor goes out of business, and nobody knows where the originals ended up.

The result: a document that carries the visual authority of a precise engineering drawing but may not reflect reality at all.

Why the Problem Gets Worse Over Time

Even a well-documented as-built is only accurate at the moment it was recorded. Facilities change constantly and most of those changes never find their way into the drawings.

Consider what happens over a 20-year period at a typical commercial or industrial site:
•    Emergency repairs reroute a gas or water line around an obstacle. The fix works. The drawing doesn't get updated.
•    A tenant installs conduit for their own electrical feed. Permitted locally but not logged in the facility record.
•    Underground fuel tanks are removed. New piping gets installed in a slightly different location.
•    A building addition shifts the routing of utilities in ways that conflict with what the original drawings show.
•    Previous excavation or construction disturbs utilities without anyone noting the final position.

None of these individually look like a crisis. Together, they create a facility records environment where the drawings on file are a rough approximation of reality, not a reliable guide to what's underground.

What That Means for Contractors in the Field

The exposure here is significant and often misunderstood.

First, there's the obvious physical risk: strikes on gas lines, electrical conduit, and high-pressure water mains can injure or kill crew members. This isn't a remote scenario utility strikes happen daily across the country.

Second, there's the liability exposure. When a contractor hits an unmarked or mislocated utility, the question of who bears the cost often comes down to what due diligence was performed before the dig. Did you call 811? Yes — but 811 only covers public utilities. Private utilities on private property are entirely outside that system. Did you request facility records? Yes — but did you treat those records as gospel, or did you take additional steps to verify?

Third, there's the project disruption. An unexpected utility strike doesn't just damage infrastructure, it shuts down the job, triggers insurance involvement, and can derail a project schedule by weeks.

Experienced contractors understand this. The ones who get burned are often those who trusted facility records more than the records deserved.

The 811 Gap Most Contractors Don't Think About

Calling 811 is mandatory and necessary, however, it’s not sufficient.

The 811 system routes your locate request to utility operators the companies that own public gas, electric, telecom, water, and sewer lines. Those operators are responsible for marking their infrastructure.

What 811 does not cover:
•    Private utilities on private property — fuel lines, irrigation systems, underground electrical feeds serving buildings
•    Lines that have been abandoned by one owner and acquired (sometimes informally) by another
•    Utilities installed before mapping systems were common, particularly in older industrial and agricultural sites
•    Secondary systems added by tenants or previous owners with no formal record
•    Any infrastructure that falls outside the jurisdiction of a participating utility operator

This is where private utility locating fills the gap and where relying exclusively on as-built drawings creates real exposure.

What Good Pre-Dig Practice Actually Looks Like

Smart contractors have moved away from a binary approach — call 811, review the drawings, start digging. The better framework is layered verification:

1. Treat drawings as a starting point, not a source of truth
Use facility records to understand what's likely present and roughly where. Then plan additional verification steps before the dig, not as a backup to the drawings, but as a required step regardless of what the drawings show.

2. Commission private utility locating on any site with record uncertainty
Private locating uses electromagnetic detection and ground penetrating radar (GPR) to identify utilities in the field independent of what's documented. On sites with older records, complex utility histories, or private infrastructure, this is the only way to close the gap between what the drawings say and what's actually there.

3. Document your verification steps
If something goes wrong, your ability to demonstrate due diligence matters. A locating report, a record of your record requests, and photos of your hand-digging tolerance zone all create a paper trail that can significantly affect liability outcomes.

4. Communicate what you find (and what you don't)
If a locate turns up something not on the drawings or fails to confirm something that should be there that's information the facility owner needs. A contractor who surfaces discrepancies before a dig creates value for the owner and protects themselves from being blamed for an existing records problem.

The Contractor's Real Competitive Advantage Here

There's a tendency in this industry to treat pre-dig verification as a cost, something that adds time and money to a job without adding visible value.

The contractors who've been around long enough think about it differently.

A utility strike doesn't just cost you money on one job. It costs you the relationship with the owner. It costs you standing with your insurer. In serious cases, it costs you your license. And it can cost someone on your crew their safety.

Contractors who invest in verification, who build private locating into their workflow on complex jobs, who push back on facility owners who resist it, who document everything tend to have better safety records, cleaner project histories, and stronger reputations for getting jobs done without surprises.

That's not an accident. It's the result of not trusting documents that weren't designed to be trusted.

The Drawing in Your Hands Is a Starting Point

As-built drawings are a reasonable starting point for understanding a site. They are not and should not be treated as a guarantee of what's underground.

Facility records age. Records get lost. Changes go undocumented. The longer a site has been in operation, the more likely its drawings are to diverge from reality.

The excavation industry's most experienced operators know this. They verify in the field. They use private utility locating where the stakes warrant it. And they never let a piece of paper substitute for an actual understanding of the ground.

If you're managing excavation work and have questions about what private locating covers, how it works alongside 811, or when it makes sense to commission it, we're happy to talk through your specific situation. Give Blood Hound Private Utility Locating a call today.