VAC TRUCK HYDRO-EXCAVATION — NON-DESTRUCTIVE SLC DIGGING

A vac truck — properly called a hydro-excavation or hydrovac truck — uses a high-pressure water wand to break soil into slurry, then a 15-inch industrial vacuum hose to suck the slurry into a 10-13 cubic yard debris tank. The result is a precision hole with intact, undamaged utilities at the bottom. No blade, no teeth, no tiger-tooth bucket risking a $40,000 fiber cut. In SLC specifically, hydro-excavation matters more than anywhere else in our service area because of two factors: the most layered legacy infrastructure in Utah lives under pre-1940 SLC neighborhoods, and the Wasatch clay-cobble soil makes blind digging near any buried utility genuinely dangerous.

What's actually under an Avenues yard

Pre-1940 SLC blocks have utility generations stacked on top of each other. A typical Avenues block has: 1920s terra-cotta storm drain (often abandoned, sometimes not), 1940s cast iron gas service (replaced upstream but stub may still be buried), 1960s steel water service, 1980s PVC sewer lateral (sometimes sharing trench with the older clay main it replaced), and modern fiber and cable from the last 20 years — all in the same 4-6 foot excavation envelope. Blue Stakes 811 covers maybe 60% of what's actually buried. The rest is unmarked, unmapped, and waiting for a steel bucket edge to find it the hard way.

Hydro-excavation is the answer because water at 2,500-3,500 PSI breaks soil without the shear force of a steel bucket — gas lines, fiber optic conduits, water services, and primary electrical all survive hydro-excavation even at full operating pressure. We daylight (expose with hydro-excavation) before any excavation that crosses or comes within 18 inches of a known utility. Most utility owners (Dominion Energy, SLC Public Utilities, Rocky Mountain Power) require hydro-excavation within 18 inches of their buried infrastructure — it's not just a best practice, it's a contractual requirement on commercial work.

Where we use the vac truck in SLC

Daylighting buried utilities before main water or sewer line work. Standard procedure on every Avenues, Capitol Hill, Marmalade, and Sugar House job. Blue Stakes marks are off by 18-24 inches more often in pre-1940 SLC than in newer construction — the underlying utility records are aged, the trenches were dug 90+ years ago, and ground shift has moved things. Daylighting confirms exact depth and direction before the excavator starts.

Potholing for directional drilling and conduit install. SLC fiber, cable, and conduit installers contract us routinely for entry/exit potholes on horizontal directional drilling. Especially common downtown and on State Street where surface restoration on open trench is operationally impossible.

Pre-construction utility mapping under Capitol Hill or Avenues additions. Homeowner adding a basement bedroom, a small addition, an ADU? The yard above the planned footprint has 90+ years of layered utility uncertainty. Pothole grids confirm clear excavation before the GC starts.

Catch basin and SLC storm drain cleanouts. Commercial properties, HOAs, downtown buildings, and SLC public works contract us for scheduled cleanouts — 5-foot storm drain vaults, roof drains clogged with silt, parking lot catch basins full of decades of sediment.

Emergency spill response. Chemical spills into containment, flooded basements with bulk water evacuation, downtown commercial vault flooding, restaurant grease incidents. Our debris tanks are rated for liquid loads up to 3,500 gallons.

Slot trenching near live utilities. Where conventional excavation would risk strikes, we cut a precision slot trench with the vac truck — 12 inches wide, full utility depth, zero blade contact. Routine around buried gas mains, primary electrical, and live fiber on SLC commercial sites.

Why our SLC trucks are different

Heated water for winter. Frost depth in SLC is 30 inches, meaning December through March the top 2.5 feet of soil is frozen solid. Conventional excavators hammer through it. A hydrovac with a heated water system handles it cleanly — we run 180°F water and frozen soil breaks apart within minutes. Most dry-vac or cold-water rigs can't do this — they freeze up themselves on a January Avenues jobsite. Our trucks work every month of the year.

Cobble-rated debris hoses. Softball-size rocks in clay matrix don't vacuum through standard boom hoses. Our trucks run 15-inch debris hoses with reinforced walls, 350 HP blowers, and rock ejection systems — enough to pull cobble up 30 feet of boom without clogging. Lighter dry-vac units built for California sandy loam get stuck in the first hour on a Wasatch jobsite.

Pre-1940 SLC experience. Our operators have spent more time potholing in the Avenues and Capitol Hill than anywhere else in the valley. They know which blocks have surprise terra-cotta. They know how deep the original 1920s gas typically runs in Marmalade. That experience saves real money — fewer surprise-discovery slowdowns, faster completion on tight commercial schedules.

Pricing model

Vac truck work is hourly, not flat-rate, because no two jobsites are the same. We bill in portal-to-portal hours — truck leaves the 300 N yard, works the job, dumps at approved disposal, returns. Rate includes truck, operator, support tech, and dumping fees where applicable. Most residential daylighting jobs are 2-4 hours. Commercial pothole grids run 6-10 hours. Scheduled recurring work (HOAs, downtown property managers, SLC commercial accounts) gets contract pricing with discounted rates.

Blue Stakes 811 locates are mandatory even for vac truck work — the law doesn't care which tool is doing the digging. We file on every job and wait the full 48 business hour period before arriving. Locating a utility incorrectly and striking it with water is still a strike, still a fine, still a rebuild. Quality Service Club residential and small commercial customers ($79/year) get 15% off vac truck hourly rates.