Hydro Excavation

Why water instead of a bucket

A backhoe tooth does not know the difference between fill and a gas service. Water does. Pressurized water erodes soil but flows around a pipe, a duct bank or a fiber conduit without cutting it. That is the entire argument for the method, and on a congested corridor it is a strong one. A strike is not just a repair bill. It is a shutdown, a report, an outage that lands on somebody else’s customers, and a crew standing around while it all gets sorted out. The other half of the argument is the tolerance zone. Once a facility is marked, the utility owner and the state dig law put a buffer around that paint where mechanical equipment is not permitted, and inside that buffer you have two options. You dig by hand, which in limestone is a long and demoralizing day, or you dig with water and vacuum. Most crews figure out which one they prefer the first time they try the other.

The wand, the tank and the settings in between

The tool itself is simple enough to describe and harder to run well. A lance carries water to a tip at the end, the operator works that tip across the soil in a pattern, and the material breaks loose as slurry. A separate hose, wide enough to swallow gravel and root, lifts everything into a debris tank on the truck under vacuum. Neither half is doing anything clever on its own. The craft is in the settings. Pressure gets matched to the ground, and the tip gets matched to what is near it. A rotating head spreads energy across an arc and is the usual choice once we are close to a facility. A tight straight jet cuts faster and will mark a coating if somebody lets it dwell, so the wand stays moving and holds standoff. Anyone can rent this equipment. What you are actually hiring is the hand on the wand.

What South Florida ground does to a dig

Around Miami you hit oolitic limestone shallower than crews from other states expect, and you hit water not far below that. A high water table means a hole wants to refill while you are still working in it, and it means loose sandy fill above the rock moves easily. Vacuum excavation handles both. The tank pulls water and spoil together, so a wet hole is a normal Tuesday rather than a problem to solve. Move west into the drained wetland ground behind Broward and Palm Beach and the argument inverts. There the material is soft, wet muck that takes almost no pressure to move and will not hold a vertical wall for long, so the hole gets opened deliberately and the walls get watched. Out on the southwest coast toward Fort Myers and Naples it is sand, which runs easy and sloughs easy. Rainy season adds an afternoon storm to the plan most days from June onward, and some of that day belongs to the weather whether or not anyone budgeted it.

Where the spoil goes, and why that is your problem too

What comes out of the hole is a regulated waste stream from the moment it enters the tank. It is soil mixed with groundwater and whatever the site has been holding, and it cannot be dumped in a corner of the lot, washed into a basin, or left as somebody else’s decision. It rides out in the tank to a facility permitted to receive it, and there is a record of that. We hold the haulers permit that lets the truck carry it and the dumping permit that gives it a legal destination. That chain matters more than it sounds like it should, because the generator of the waste, which on most jobs is you or your owner, keeps a share of the responsibility for where it ends up. Ask any vacuum contractor where the spoil goes. If the answer is vague, that is the answer.

Owned trucks, and the whole job from locate to restoration

The work runs off our own tanker units. We are not brokering the job to whoever is available, which is the difference between a scheduled window and a maybe, and it is the difference between one crew that knows your site and a stranger every visit. Every driver holds a CDL and the fleet runs under USDOT 4547071, active. The company is family owned, first responder owned, bonded and insured, with a master plumber on staff and the phone answered at any hour of any day. A job runs the same way each time: the ticket goes in and the marks go down, we work from those marks and confirm what is really there, the hole gets opened and the facility exposed clean, everything gets measured and photographed, then it is backfilled, compacted and the surface put back. Spoil leaves with the truck. You get the record.

Worth knowing

Anyone can rent a vac trailer. The part that matters is what happens to what comes out of the hole. Slurry is a regulated waste stream, and a contractor without a haulers permit and a disposal permit has to put it somewhere. Ask where.