Potholing in Dallas-Fort Worth, TX

Potholing is a non-destructive excavation method that creates a small test hole, typically 12 to 18 inches in diameter, directly over a buried utility. We use pressurized water to loosen the soil and industrial vacuum to remove it, exposing the utility for visual verification. This allows us to confirm the exact depth, horizontal position, size, and material of the line without risking damage from mechanical digging.

The ASCE 38 standard defines four quality levels for subsurface utility engineering (SUE) data. Quality Level A is the highest tier and requires direct physical exposure of the utility through methods like potholing. It provides precise, measured data including depth, horizontal position, size, material, and condition. Many engineering firms and project owners in the DFW area now require Quality Level A data for utilities within the construction zone because it eliminates guesswork from the design process.

The Blackland Prairie clay soils throughout Dallas-Fort Worth expand when wet and shrink when dry, creating ground movement that can shift buried utilities several inches from their documented positions over time. This makes potholing especially important in DFW because the as-built records and even recent Texas 811 marks may not reflect the actual current position of underground lines. Hydrovac potholing reveals where the utility actually sits today.

Yes. Texas law requires notification to Texas 811 at least two full business days before any excavation, including hydrovac potholing. The 811 locate marks provide a starting point for our work, and we use potholing to verify those marks with physical, Quality Level A confirmation. We coordinate with the 811 process on every project.

In typical DFW soil conditions, our crew can complete 10 to 20 potholes per day depending on depth, spacing between holes, and documentation requirements. Shallow utilities in accessible areas go faster. Deeper utilities in hard, dry clay or congested sites with traffic control requirements take more time. We provide a realistic production estimate during project planning so you can schedule accordingly.

Most potholes are 12 to 18 inches in diameter at the surface, though the opening may be slightly larger depending on the depth and the angle needed to visually confirm the utility. The small footprint is one of the key advantages of hydrovac potholing. It creates minimal surface disruption compared to traditional excavation methods, which is especially valuable on active roadways, landscaped properties, and congested urban sites.

Before a horizontal directional drill begins, each point where the planned bore path crosses an existing utility needs to be verified for adequate vertical separation. We pothole at each crossing point to expose the existing utility, measure its exact depth and position, and confirm that the planned bore has sufficient clearance. This prevents cross-bore incidents that can damage existing infrastructure and trigger expensive emergency repairs.

We provide a detailed pothole log for each excavation that includes the utility type, depth below grade, horizontal offset from a reference point, pipe or conduit size, material type, and visual condition. Each log is accompanied by photographs of the exposed utility and GPS coordinates of the pothole location. This data package is formatted to meet SUE Quality Level A standards and can be delivered directly to your engineer for incorporation into design documents.