Frequently Asked Questions

Vacuum excavation uses air pressure and suction to remove soil, while hydro excavation combines pressurized water with vacuum systems. Hydro excavation works better in compacted or challenging soil conditions because water breaks up dense ground more effectively. Both methods are non-destructive around buried utilities, but hydro excavation handles difficult terrain that air-based systems struggle with.

811 utility marking programs cover only public infrastructure managed by utility companies—lines up to the meter or property connection point. Private electric, gas, water, sewer, irrigation, and communication lines beyond that point aren't tracked in public databases. Property owners and contractors are responsible for locating private utilities before excavation to avoid strikes, project delays, and repair costs.

Potholing verifies exact utility location and depth when underground records are outdated, conflicting, or missing entirely. It's critical before drilling, trenching, or installing anchors near suspected utility corridors. Small test holes expose infrastructure visually, allowing crews to adjust plans before mechanical excavation equipment damages buried lines.

Pressurized water can't puncture gas lines, sever electrical cables, or rupture water mains the way backhoe buckets and augers do. Operators control excavation remotely from the vacuum truck, keeping personnel away from the dig zone. This eliminates direct contact with unknown buried hazards that cause injuries during manual or mechanical excavation.

SUE integrates utility records research, field locating with specialized equipment, vacuum excavation for verification, and geospatial data analysis. The process documents utility type, location, depth, and condition before design work begins. Engineers use this information to avoid conflicts, reduce redesign costs, and eliminate utility surprises during construction.

Mountain terrain creates compacted soils, rocky subsurface conditions, and elevation changes that complicate utility installation patterns. Infrastructure often follows irregular topography rather than standard grid layouts. Records may be incomplete for older developments in remote areas, making field verification with vacuum excavation essential before breaking ground.

Crews use vacuum excavation to expose buried utilities at planned construction intersections, creating visual confirmation of infrastructure before work proceeds. The process removes soil without damaging lines, allowing measurement of depth, identification of utility type, and assessment of condition. Holes are backfilled after inspection, and locations are documented for construction coordination.

Digital utility maps created during locating or installation capture horizontal and vertical positions that remain accessible decades later. When future excavation, expansion, or repair work occurs, crews know exactly where infrastructure runs underground. This eliminates guesswork, reduces accidental damage during maintenance, and speeds up emergency response when utility access is needed.

Private electric service beyond the meter, irrigation systems, site lighting circuits, communication networks, security wiring, fire suppression lines, and sanitary sewer laterals all fall outside public utility marking coverage. Commercial sites often have layered infrastructure added during expansions, with incomplete records. Locating identifies these systems before grading, trenching, or installing fencing and bollards.

High-pressure water breaks through compacted soil and can penetrate frozen ground when adjusted for temperature and soil density. Hydro excavation handles clay, caliche, and densely packed fill that resists mechanical digging. In winter conditions, heated water systems maintain effectiveness, though excavation in deeply frozen ground may require thawing or specialized techniques depending on frost depth.