The Method
Hydro vac excavation, explained
The method ANIC has practiced exclusively since 2001: high-pressure water breaks the soil, vacuum lifts the spoil, and everything buried comes out of the story intact.
Quick answer
Hydro vac excavation is the process by which high-pressure water breaks up dirt and material, which is then vacuumed into a truck via hose and brought offsite to a proper disposal facility. It is also known as hydro excavation, daylighting, potholing, or vacuum excavation — and it is a safer, more efficient, non-destructive alternative to manual or machine excavation.
How the process works
- Pressure. A focused high-pressure water jet cuts and breaks up the soil exactly where the excavation is needed — nothing mechanical touches the ground near the utility.
- Vacuum. The resulting slurry is drawn up the boom hose into the truck's debris tank, leaving a clean, precise cavity.
- Disposal. The truck hauls the spoil offsite to a proper disposal facility — environmental handling is part of the service.
Hydro vac vs. mechanical vs. hand digging
The comparison that decides most contracts:
| Factor | Hydro vac | Mechanical (backhoe) | Hand digging |
|---|---|---|---|
| Utility strike risk | Minimal — water and air do the cutting | High near live plant — steel teeth | Low but not zero — shovel strikes happen |
| Speed | Fast — powered excavation without the strike risk | Fast in open ground only | Slowest by far |
| Precision | Exact cavity size and depth | Over-digs; disturbs bedding | Precise but limited depth |
| Crew exposure | Crew stays out of the hole | Operator + spotters at risk | Workers in the excavation |
| Spoil handling | Contained in tank, hauled to disposal | Stockpiled on site | Stockpiled on site |
When hydro vac is the required method
- Daylighting utilities for design verification before construction.
- Excavating within the tolerance zone of located utilities, where owner specs and ORCGA damage-prevention best practices direct non-destructive methods.
- Congested urban corridors — gas, hydro, fibre and watermains sharing the same trench line.
- Frozen ground, where heated water cuts what a bucket can't safely.
- Emergency exposure of failed infrastructure, where making the problem worse is not an option.
Why ANIC for hydro vac
ANIC has been an exclusive hydro vac company since 2001 — the trucks, the training and the procedures all serve one discipline. That single-mindedness is why the Ministry of Transportation, the GTAA, the Government of Canada and municipalities across Ontario put ANIC trucks on their sites. In the company's own words: "Our primary concerns are to protect the environment, maintain a safe workplace and provide substantial value to our customers and the public."
Method questions
Is hydro vac excavation safe for buried gas lines?
That is exactly what it exists for. Because the soil is cut with water rather than steel, located gas, hydro, fibre and water lines are exposed intact rather than struck. It is the accepted non-destructive method for digging inside a utility's tolerance zone.
What happens to the excavated material?
The slurry is vacuumed into the truck's debris tank and brought offsite to a proper disposal facility — it never sits stockpiled on your site.
Is it also called daylighting or potholing?
Yes — hydro excavation, daylighting, potholing and vacuum excavation all describe the same water-plus-vacuum method; daylighting and potholing name specific applications of it.
Need the ground opened — safely?
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