GPR (Ground Penetrating Radar) Services

Services: GPR (Ground Penetrating Radar) Services

What is Ground Penetrating Radar?

Ground Penetrating Radar (GPR) is a non-invasive geophysical location method that uses radar pulses to model an image of the subsurface conditions. Unlike electromagnetic utility locators, which require a conductive line to trace, GPR can detect non-metallic utilities and structures such as plastic pipes, fiber optics, septic tanks, voids, concrete structures, and buried objects that emit no signal. Atlas Surveying uses GPR in conjunction with EM (Electromagnetic) Locating to ensure all underground structures are properly located.

Why Do You Need GPR Services?

GPR is an essential tool when electromagnetic locating isn't feasible or effective—such as in the case of dielectric cables, untraceable conduit, or areas where previous utilities may be damaged or cut. GPR can detect subsurface anomalies and provide approximate depths, offering a comprehensive picture of underground conditions. This added clarity supports design, excavation, and compliance efforts by revealing critical buried elements that would otherwise remain hidden.

Key Components of GPR Services

From site scanning to comprehensive CAD deliverables

  1. Site Scanning:

    Field technicians scan the ground surface using a GPR unit equipped with appropriate antenna frequency based on expected depth and soil conditions.

  2. Feature Detection:

    GPR identifies buried objects based on differences in material composition, differentiating between soil types and solid objects.

  3. Location Marking:

    Detected features are marked on the surface with paint or flags and logged via GPS for CAD drafting.

  4. CAD Deliverables:

    Located features are drafted into utility base maps or survey drawings formatted to client and regulatory standards.

How to Request GPR-Supported Services from Atlas Surveying

To request GPR services, please provide:

Project location and area of concern

Known or suspected utilities and materials on-site

Purpose of the GPR scan (e.g., design, excavation, assessment)

Access details and timeline for service

Why Choose Atlas Surveying for GPR Services?

Atlas Surveying combines GPR technology with professional survey-grade GPS and CAD integration to deliver precise, dependable subsurface data. Our technicians are trained in interpreting GPR signals and integrating findings with overall survey workflows. Whether verifying utility absence or identifying unknown underground objects, our GPR services reduce risk and give the confidence needed for crucial decision making.

Contact Atlas Surveying today to schedule professional GPR services tailored to your site's subsurface needs.

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Frequently Asked Questions

Get the answers you need to move forward with confidence

How does GPR work?

Ground Penetrating Radar works by sending signals into the ground and analyzing the return signals or “echoes” from objects below. The depth and speed at which the signal travels reflect the density of the soil or object in question.

If I hire private utility locators, do I still need to call 811 before I dig?

Yes, calling 811 is a legal requirement even if private utility locators are hired.

What do the SUE quality levels stand for?

Quality level A involves physically exposing the utility, often involving potholing to get a visual on the line. Quality level B involves marking the horizontal locations of underground utilities using electromagnetic utility locators and GPRs (Ground Penetrating Radar). Quality level C involves locating visible utility structures such as manholes, valves, hydrants, or other features that indicate the existence of underground utilities. Quality level D simply involves gathering data from historic records such as old surveys or as-built drawings.

What is SUE (Subsurface Utility Engineering)?

Subsurface Utility Engineering (SUE) is a specialized discipline dedicated to the precise identification, documentation, and analysis of underground utilities. It involves locating, assessing, and detailing the position and condition of subsurface infrastructure such as pipes, conduits, and cables. By delivering reliable utility data early in a project, SUE reduces the risk of unexpected utility conflicts, delays, and costly damage during construction activities.

What utilities can GPR detect underground?

GPR can locate metallic or non-metallic utilities, voids, tanks, concrete structures, and other anomalies beneath the surface.

Why would I pay for Utility Locating if 811 is free?

There are two answers to this question. 811 is a free service offered to the public that only locates public utilities on public land. This typically means that their locations stop at the utility meter, and the remaining private portion of the line is not located. If you are looking for private utility location services, you’ve come to the right place. 811 is a free service… Like most free services, it has its flaws. Historically, 811 locations can be unreliable. When it comes to protecting your utilities from damage, would you rather hang your hat on a free service, or be confident with professionals?