Subsurface Utility Verification Surveys

Subsurface Utility Verification Surveys

Using our knowledge and experience with regards to topographic mapping and utility construction, White Shield utilizes a variety of equipment to determine the presence of subsurface utilities and obstructions. Our methods employ a non-invasive, sub-surface characterization of man-made objects beneath the earth’s surface. Our licensed geologists are knowledgeable and experienced in working with ground penetrating radar (GPR), electromagnetics, radio frequency detection, and magnetics.

We provide the necessary geo-referenced information to locate utilities to avoid conflicts during excavation activities, and design or construction of new utility lines.

These services include:

• Subsurface Utility Verification
• Utility Locating and Mapping
• Underground Storage Tank Locating
• Dry Wells
• Borehole Clearance
• Rebar Mapping
• Concrete Assessment

Our certified technicians are knowledgeable and experienced working with ground penetrating radar (GPR), electromagnetics, and frequency detection equipment. The pipe and cable locators are used in conductive or inductive modes to search for buried conduits and active electrical lines. GPR is used to search deep into the soil (up to 30 feet) for buried utilities and obstructions. They can provide the necessary geo-referenced information to locate utilities to avoid conflicts during excavation activities, and design or construction of new utility lines. We also use a high-frequency GPR device to map concrete floors and walls. In environmental remediation, it is used to define landfills, contaminant plumes, buried drums, underground storage tanks (USTs), and pipelines and conduit that could transport wastes from the spill location. In engineering and construction applications, the expense of subsurface investigations is easily justified in the face of the discovery of unknown utilities that create work stoppages and change orders. The equipment we employ includes:

• Ground Penetrating Radar; GSSI Utility Scan with 400 Mhz antennae with SIR 3000 controller/data collector
• Electromagnet Induction: RadioDetection RD8100 Pipe and Cable Locator, or Schonstedt XTpc+ for inductive detection.
• Frequency Detection for Energized Lines: RadioDetection RD8100 Pipe and Cable Locator on multiple frequencies, or Schonstedt XTpc+ using 50/60 Hz for passive detection of energized lines.
• Rebar Location In Concrete; GSSI Palm Scanner at 2000 MHz with SIR 3000 controller/data collector