What You Didn't Price Is Below Grade

Somewhere in the United States, a buried utility gets hit by a digging crew every 2 minutes and 40 seconds. That's the finding in the Common Ground Alliance's 2024 DIRT report, drawn from just under 200,000 damage reports, and the group puts the annual cost of the damage it can't fully count in the tens of billions of dollars. The same report says the trend is moving the wrong way. Their damage index rose from 94.0 in 2023 to 96.7 in 2024.

You bid the dirt you could see. The dirt that decides whether the job makes money is the part you couldn't, and most of the fights on a site-work job are really fights about who agreed to pay for that.

The uncertainty is priced or it's eaten

Every excavation bid contains an assumption about what's under grade, whether the estimator wrote it down or not. Soil that digs clean. Rock where the geotech said there'd be dirt. Groundwater that shows up 2 feet higher than the borings promised. A gas line the locate ticket missed. Fill from a building nobody remembered was there. Each of those is a real cost, and each one lands on somebody. The only question the contract answers is who.

That answer usually lives in a clause most owners skim, the differing site conditions provision. Construction lawyers writing on this keep making the same distinction. A Type I condition is the site not matching what the contract documents told you to expect. A Type II is a condition so unusual nobody would have expected it. On federal work the clause is mandatory and the owner carries that risk by regulation. On private work it's negotiable, which means it's frequently negotiated right onto your back with a line that says the contractor is deemed to have inspected the site and accepts all subsurface conditions. Sign that and you have agreed, in writing, to eat whatever's down there. The rock is now free. To the owner.

I have watched capable contractors lose a whole season's profit not to bad digging but to bad contract reading. The crew performed. The soil didn't cooperate, the machine sat, the schedule slipped, and when they turned to the contract for relief the clause they'd signed had quietly handed them the risk months earlier. The dirt was never the problem. The signature was.

The locate ticket is not a guarantee

Even when the contract protects you, the locate system is thinner than crews treat it. That DIRT report found excavators had an average 38 percent chance of not being able to start on time because the locate response was incomplete. More than a third of the time the marks aren't there, or aren't all there, when your crew shows up ready to dig. That's idle machine time and idle crew time, and unless your contract lets you bill for it, it's yours.

And the marks that do show up aren't gospel. Mismarked, undocumented, and abandoned lines are among the most common reasons crews hit something that a clean 811 ticket said wasn't there. When you hit it, the DIRT data is a preview of the bill: the repair, the fines, the third-party claims from the neighborhood that lost service, and the days your crew stands down while the utility restores its line. A single strike can erase the margin on the job that caused it and reach into the next one.

Move the risk before the machine moves

The defense is boring and it works, and it happens at the desk, not the site.

Read the differing site conditions clause on every contract before you sign, and if it makes you the insurer of everything below grade, price that risk into the number or negotiate the clause. Owners expect a contractor to push back on that language. The ones who don't push back are the ones who end up paying for surprises they never got a dollar to cover.

Put your subsurface assumptions in writing in the bid. State the soil and rock and water conditions you priced against, and the borings or reports you relied on. That single paragraph converts a vague future argument into a clean claim: conditions differed from what was represented, here's what we assumed, here's the change order. Estimators who write nothing down have nothing to point at when the ground lies to them.

Then treat the locate delay as a billable event, not a favor. If crews can start on time only 60-odd percent of the time, standby for late or incomplete locates belongs in your terms as a priced line, the same as any other owner-caused delay.

The ground will surprise you. It's supposed to. Your job is to make sure the paperwork surprised the other side first.