What is a Utility Survey (SUE) and Why It Prevents Construction Accidents
Every excavation project shares the same hidden risk: what is actually buried beneath the surface. Subsurface Utility Engineering combines multiple detection methods into a systematic process for locating and documenting underground utilities before any digging begins, dramatically reducing strike accidents and project delays.
SUE Quality Levels
| Level | Method | Confidence |
|---|---|---|
| Level D | Existing records review only | Low, records often outdated |
| Level C | Records plus visible surface features | Moderate |
| Level B | GPR and electromagnetic detection survey | High, horizontal position confirmed |
| Level A | Physical exposure by careful excavation | Highest, exact position and depth confirmed |
The SUE Process
1
Records Research
2
Field Detection
DGPS coordinates and depth estimates, compiled into a comprehensive utility map.">
3
Mapping
4
Critical Verification
4 levels
SUE quality levels (A through D)
5m
Typical GPR detection depth
Zero
Excavation needed for Level B detection
Why This Prevents Real Accidents
Utility strikes during excavation are a leading cause of construction delays and safety incidents. A gas line rupture, an electrical cable strike, or a damaged fiber network line can each cause project stoppage, safety hazards, and significant unplanned cost.
Before any excavation or pile driving on your project, GPR-based utility detection confirms what is actually underground, replacing guesswork with verified data.
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