Resource Library



Construction Safety Week

SAFETY WEEK 2021 | MAY 3rd – 7th

Our entire team is committed to your safety and the safety of your job site so that you can go home at the end of the day. From our team to yours, work safe!

What is your plan for Construction Safety Week Week?

Please reach out to your local representative if you are interested in GPRS presenting on your site or at your office.

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Concrete Sawing & Drilling Safety Week

SAFETY WEEK 2022 | Dates Coming Soon

Our entire team is committed to your safety and the safety of your job site so that you can go home at the end of the day. From our team to yours, work safe!

What is your plan for Concrete Sawing and Drilling Safety Week Week?

Please reach out to your local representative if you are interested in GPRS presenting on your site or at your office.

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Master Locators - a GPRS Company

TOLEDO, OH - Ground Penetrating Radar Systems, LLC (GPRS) has acquired Master Locators as of August 2019. Master Locators is a leading provider of private utility locating, concrete scanning, vacuum excavation, subsurface utility engineering, and video pipe inspection services. Master Locators is the fourth private utility locating company to be acquired by GPRS.

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In the News


GPRS Uses Ground Penetrating Radar to Expand Business


Many early adopters of ground penetrating radar (GPR) technology found concrete scanning to be the effective application. Those anchoring, saw cutting, or core drilling concrete would hire a contractor to scan the area before cutting to avoid accidentally hitting an object. For this reason, construction firms have come around to the notion that concrete scanning is vital to job site safety and efficiency.

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Civil & Structural Engineer Mag Informed Infrastructure Mag Highways Today


Solutions for Supporting the Aging U.S. Utility Infrastructure

By Concrete Openings

Much has been studied, analyzed and written about as it relates to the aging U.S. infrastructure over the last several years. While we can't pretend we have the expertise to add high-level studies, data or information to the ongoing conversation regarding infrastructure, we do want to provide a unique perspective from an industry contractor who supports the efforts to maintain, upgrade and replace that infrastructure.

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Industry Insights


New ALTA Public Vs. Private Mandate – What You Need To Know

The new 2021 revision of the ALTA/NSPS Land Title Survey Standards is now in effect, marking the first update in five years. This new set of standards took effect in early February 2021, replacing the requirements set in their last 2016 update.

While there are a few updates to the standards, there is one major change to your requirements that affects all your jobs moving forward. The responsibility for public underground utility location has shifted to help bridge the gap to private utility markings, ensuring greater safety to construction personnel.

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Here Lies The Bodies Of 11 American Soldiers; Known Only To God.

We travel back to New Jersey to help the American Legion Post 369 uncover the 250-year-old mystery for the graves of fallen Continental Army soldiers.

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How To Reduce Your Inspection Costs By Reducing Your Use Of Potholing

If Seeing Is Believing, Potholing May Be Your Best Bet. But At What Cost?

Potholing is one of the tried and true ways to protect yourself before you dig. It’s already built into a lot of construction processes as a standard practice. For most, they consider this the best and only way to be sure about identifying what lies beneath the surface of a construction site.

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The Critical Importance Of A Ground Disturbance Plan And How It Saves You Money

6 Steps To Create A Safe Jobsite That Will Save Your Company Money

As any new construction project starts, the completion timeline is one of the most critical aspects to protect. However, if the timeline is achieved over budget or at the risk of worker safety, it is not going to be considered a successful project.

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This Is The GPRS Origin Story

By Matt Aston

Today, GPRS (Ground Penetrating Radar Systems) is the largest private utility locator in the United States, with a nationwide network of more than 300 project managers in more than 54 major metro areas.

Thanks to our proprietary Subsurface Investigation Methodology (SIM) industry specification, which includes intensive requirements for staff training and on-site processes far exceed the industry standard specifications.

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GPRS Provides the Best GPR Services in the United States

Fast, reliable and quality service is something that consumers are always in search of when they need an accurate locate. Contractors and environmental companies in need of our services find themselves searching the web for, “concrete scanning near me”, “utility locate near me”, “video pipe inspection near me” “ground penetrating radar services near me” or “gpr company near me” – but there is a solution. Ground Penetrating Radar Systems (GPRS) has locations near you in every major market in the United States.

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Accurate & Comprehensive Locates

When calling for a utility locate, it is essential to locate a company that specializes in providing both a public and private locate. The “call before” you dig system is a great tool to use when needing a locate in a public right of way. When a locate is needed on private property, the “one-call” system should still be utilized but the private property locate is not complete until a private locator has located all of the utilities.

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Solutions for Supporting the Aging U.S. Utility Infrastructure

Much has been studied, analyzed, and written about as it relates to the aging U.S. infrastructure over the last several years. While GPRS can’t pretend we have the expertise to add high-level studies, data, or information to the ongoing conversation regarding infrastructure, we do want to provide a unique perspective from an industry contractor who supports the efforts to maintain, upgrade, and replace that infrastructure. Our goal is to bring you that perspective and the unique ways in which GPRS might be able to support the needed infrastructure upgrades in our communities. From one vantage point, given the data, the infrastructure needs in the U.S. seem like an insurmountable task. From our vantage point, with the power of American ingenuity, teamwork, and grit, we can overcome and ensure the critical infrastructure stability needed for our future.

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The GPRS Statement of Qualifications

GPRS was founded in 2001 and is now the nation’s largest private utility locator with Project Managers based in every major market in the United States. Our services include Utility Locating, Concrete Scanning and Video Pipe Inspection (CCTV).

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Ground Penetrating Radar Rental

Rental vs. Purchase vs. Hiring a Service

One alternative to purchasing GPR equipment is renting it. GPR rentals can be a cost-effective and sometimes a quick means of locating buried utilities. Equipment can be rented immediately (when available), allowing you to quickly get to work scanning a site.

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How Does 811 Work?

Understanding The Limitations And Significance Of Hiring A Private Utility Locating Company

In addition to 811 only locating a portion of the of the utilities locations there are also limitations of the 811 process. 811 Has very limited deliverables so if you need field sketches you will need a private utility locator. The 811 process also does not require the use of geophysical equipment so they often rely on existing records and visual observation which is Level D data. In addition it is commonly known that the 811 technicians focus on closing tickets quickly to meet their daily quota so sometimes the quality is lacking.

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What is GPR?

GPR (Ground Penetrating Radar) is a general term for a collection of devicesused to locateobjects within materials, typically in applications where visual inspection is impractical. GPR is often used to locate undergroundobjects, but it’s also used on manmade structures. Its basic operation is to emit and receivethe signals that reflect off of subsurface objects. GPRS uses GPR to scan concrete for objects such as rebar, or to locate utilities. GPRS does not use GPR for geophysical or geological purposes. Use of a GPR in conjunction with other devices can provide reliable information to prevent injuries or costly downtime on construction sites, among other uses for GPR.

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Featured Ground Penetrating Radar Projects

100,000+ Projects completed since 2001

Ground Penetrating Radar Systems offers job stories and case studies from thousands of projects since 2008. We have case studies on GPR, concrete scanning, utility locating, and cctv inspection services performed in all 50 states.

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Selecting a Concrete GPR Vendor Part 1

Determining Technology Required

There are many factors that affect the decision-making process when selecting a company to scan concrete for core drilling, saw cutting or other general demolition/destructive services. Anytime the construction process requires penetrating a concrete slab with unknown contents the potential for major damages and/or injuries is present.

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What does an underground utility locator do?

Subsurface utilities and other buried materials are often considered low priority when it comes to construction and excavation work. Yet locating them is one of the most important aspects of creating a safe work environment, and allowing work to continue on time and on schedule.

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Difference between Concrete X-ray and Concrete Scanning

When it comes to finding out what’s inside a concrete slab, non-destructive options are generally the first choice. The two main options are the use of x-rays or ground penetrating radar (GPR) to “see into” the concrete slab or structure. Both provide a closer look at what’s inside, including rebar, conduit, post-tension cables, and more.

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Utility Locating Prior to Soil Boring

Often times when a property changes hands, there can be a question about the environmental condition of the soil. Before the purchase or transaction, buyers look to avoid liability for existing environmental conditions by performing different methods of “due diligence”. Soil borings are often performed to investigate underground soil conditions of a facility where there has been contamination by hazardous materials or waste.

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GPRS internal safety program

Safety - Always on Our Radar

Here at Ground Penetrating Radar Systems, safety is our top priority in everything we do.

GPRS is committed to creating and fostering a safe work environment for our team members, and teaching them how to extend that safety to all project sites and our community.

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Why it's necessary to call GPRS in order to keep a jobsite safe

Why isn’t it enough to call 811?

While a public utility locating service such as 811 should always be your first call, these services focus ONLY on public utility location. This leaves you with the dangerous potential of hitting any private utilities they failed to locate. Calling a private utility locating service in addition to 811 will ensure you uncover all buried utilities before digging or working in an area.

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vpi comic 500pixels

We Made His Life Easier - Introducing VPI

You know that feeling you get when you go to the grocery store, don’t know where something is at, and a worker points you in the right direction? Or your computer stops working and GeekSquad fixes it no problem?

Simply, have you ever had that experience where someone pops into your world and makes life easier?

You know the feeling, where you take a deep breath and all worry leaves your body all at once?

That is the experience I felt when I heard Andy share his story about our new Video Pipe Inspection (VPI) methodology with a new prospect.

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GPRS Culture Questions Answered - Part 1

Part 1: Company Culture/Hiring - Interview with Chris Moore

Our team members are a top priority at GPRS. GPRS’s purpose is to provide development and to open new opportunities for our team, while delivering a sensational experience to our customers. In a recent internal survey, GPRS team members noted the strong sense of community as a main reason for remaining at the company. This support system is fostered through one-on-one coaching, ongoing training programs, leadership development, and much more.

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GPRS Culture Questions Answered - Part 2

Part 2: Growth - Interview with Chris Moore

First and foremost, GPRS hires team members who are prepared to uphold our commitment to accuracy and craftsmanship. Our team members undergo a rigorous training process in which they receive 2+ months of hands-on training, both in the field and at our training facility. GPRS team members ascribe to a rigorous standard operating procedure for our field work.

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GPRS Culture Questions Answered - Part 3

Part 3: Commitment to Quality - Interview with Chris Moore

At GPRS, we push our team members to remain humble and open to learning. We don’t ask for perfection but we do ask for consistent development. Team members must be willing to learn and grow- not only for themselves, but for the GPRS family.

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GPRS Turns Challenges into Opportunities

It has been a busy and cold winter, and we have encountered a few recent challenges, which we have taken as opportunities to go above and beyond for our customers. Sometimes challenges are really just opportunities in disguise—opportunities to grow, to serve others, to innovate. Here are a few recent challenges (opportunities) that our team has encountered.

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CCTV Sewer and Drain Inspection Services

Evaluate the Condition of Subsurface Utility Lines

GPRS also offers CCTV sewer inspection camera systems, designed for all types of drain and sewer inspection surveys. Our team uses state of the art HD cameras and sewer inspection systems to view the interior of buried drain and sewer lines. We can check for depth, evaluate the condition of the sewer or drain line, and identify potential access points for your team.

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GPRS Mobile App

The Industry’s First Mobile Scheduling App for GPR Services

Ground Penetrating Radar Services has made our industry leading utility scanning and locating services even more convenient for contractors and construction crews on the go. With our new GPRS mobile app, you can request a quote or schedule a crew to come out with the click of a button, and know that we’ll be in touch in moments. Take our utility locating services with you wherever you go, and make sure that your team and your job site are protected from accidental utility strikes every time you dig.

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GPRS Training Slab

A key feature of the GPRS Training Program is the ability to gain hands-on experience, both in the field and in a simulated setting. At the GPRS Training Facility in our Ohio headquarters we have a state-of-the-art slab designed to mimic all conditions commonly found on sites. This ~1000 SF slab was designed especially to enable trainees to gain experience while in a classroom setting.

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GPRS Training School

The GPRS training process emphasizes the value of both field work and classroom learning. New hires have the opportunity to shadow experienced Project Managers in the field before spending two weeks at our Ohio headquarters learning the ins and outs of life at GPRS. The entire onboard training takes between two to three months, depending on a student’s demonstrated ability.

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Subsurface Investigation Methodology

What is SIM?

SIM stands for Subsurface Investigation Methodology. SIM is a standard operating procedure comprised of two specifications created specifically for subsurface investigations- one for underground utility locating and one for concrete scanning.

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Subsurface Dangers Below

When penetrating the ground or concrete structures, there are many unknowns that could cause damage to people and equipment. From underground utilities and voids to the reinforcing steel and conduits in concrete, there are a number of potential problems you could encounter from the unknowns.

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Locating Water Lines

Water lines can be made out of various types of material, not all of which are conductive. Traditional methods of utility locating are only able to pick up on conductive materials. This leaves PVC and other non-conductive materials beyond the scope of many utility locating services. Ground penetrating radar is capable of finding all types of material regardless of conductivity. This makes it an excellent choice for locating buried water lines.

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Nationwide GPR Scanner Services

GPRS Is The Leader In Subsurface Scanning Solutions And GPR Scanning

There is only one way to safely cut or core concrete. To prevent damage to concrete slab components, construction professionals must hire a company that specializes in GPR scanning. A concrete radar service provider will use a GPR scanner to identify rebar, post-tension cables, electrical conduits, concrete beams, smurf tubing, and other impediments prior to the core drilling or cutting process.

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Concrete Scanner Equipment Rental

Renting Concrete Scanning Equipment Comes With Many Risks To Be Considered

When cutting and coring concrete slabs, there is the possibility of damage or injury. Prior to the concrete coring or concrete saw cutting process taking place, contractors are forced to ask the question, “how can I keep the property and people on my site safe?”.

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Locating Gas Lines

Natural gas is used for heating, hot water and cooking among other uses. Pipes carrying natural gas can range in size and material. Most piping used for natural gas lines is made of conductive material, making it more easily identifiable in a GPR scan.

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Locating Sewer Lines

Sewer lines are a key utility but are often overlooked by public and even private utility locating services. Lines can be made of a variety of materials, depending on their age and location. The majority of sewer piping material is non-conductive- materials such as HDPE, PVC and even clay are all commonly used. Lines can be decades old, meaning that accurate plans and as-builts are often missing or non-existent.

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Locating Buried Electrical Lines

While the majority of electrical lines are found above ground in the United States, there is still a percentage of lines which have been buried below ground. These lines often run from a public box or meter on to private property. As a result they are out of the domain of public utility locating companies such as 811. Buried electrical lines may run alongside buried fiber and other cables, complicating the process of identifying them.

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The GPRS Difference

What sets a GPRS Team Member apart?

The key to GPRS’s success is our employees. Our team members are the best in the industry, and it is for this reason that we have been able to achieve such growth. Some of the key qualities which set our team members apart include: Integrity, competency, team work, continual growth, problem solving mindset and commitment to the customer.

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The GPRS Mission

GPRS is the nation’s leading ground penetrating radar (GPR) service provider. As the largest GPR company in the U.S., we specialize in providing concrete scanning and utility locating services to identify unknown subsurface elements. Our Project Managers are extensively trained to handle all possible scenarios, making them experts in their field. With offices in all major hubs across the U.S., our team members can quickly mobilize to a site in order to identify any unknown subsurface elements impacting your project.

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The History of Electromagnetic Utility Scanning

How Electromagnetic Induction Became The Scanning Industry Standard

Electromagnetic technology was discovered by famed British scientist Michael Faraday in 1831, in one of his presentations to the Royal Institute in London. He described not only the process of electromagnetic induction, but hypothesized its use as a measuring device. His paper would lay the groundwork for the first utility scanning and locating tools.

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Advantages of Electromagnetic Utility Locating

Ground Penetrating Radar Services provides a full suite of electromagnetic scanning and locating services, designed to help provide your team with the most accurate real time scanning data possible. Our project managers are the best in the industry at scanning and locating subsurface utility lines and hazards. We provide information to help keep your team safe and keep you from spending on unnecessary repairs.

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GPRS Utility Scanning & Locating Tools

GPRS utilizes state of the art technology for all of our private utility locating and concrete scanning needs. Our equipment is the best in the industry, and our utility locating technicians receive continuous training and education on new tools and techniques for subsurface scanning and private utility locating. We’ve highlighted some of our preferred tools for subsurface scanning and private utility locating below.

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When to Call a Private Utility Locator

When performing digging and other excavation work it is more common than you would think to encounter utilities buried underground. Public utility providers offer a free “call before you dig” service in which a trained technician visits a site to identify and mark out the locations of public underground utilities. These services are a valuable tool in locating and avoiding hitting public underground utilities.

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Why You Should Scan Before You Cut or Core Concrete

Performing work on existing concrete is often a necessary part of construction. Coring, drilling and cutting are just a few of the techniques which are used on concrete slabs and walls. This concrete can contain rebar, conduit, post tension cables and other materials, with the potential to cause major damage if hit.

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GPRS & The Evolution of Industry's Technology

GPR uses an electromagnetic pulse to generate data on a computer screen, which can be studied in the field to understand existing subsurface conditions. It was this SIR 2000 and long hours working out of that basement which started the nationally recognized brand of GPRS, LLC.

Flash forward to 2019. GPRS’ focus has still been to continue finding and utilizing the industries newest and most advanced equipment to locate subsurface concerns.

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What Can GPR Find?

Ground penetrating radar (GPR) is a powerful locating tool with many applications. GPR is most commonly used along horizontal ground surfaces, but can also be used vertically on walls and other structures. Some of the most commonly performed “locates” include:

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Private Utility Locating Explained

What is utility locating?

Utility locating is the detection of underground utilities and other subsurface findings through the use of ground penetrating radar and similar tools. Utilities and other findings can be accurately located and mapped out in a safe, non-destructive manner.

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Concrete Scanning Explained

What is concrete scanning?

Concrete scanning is the use of ground penetrating radar and other equipment to detect materials or voids within a concrete slab.

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The Importance of Private Utility locating Services

An Ounce of Prevention Could Save Your Next Project Time and Money

An environmental company in Newport News, Virginia hired GPRS to assist at the site of a former gas station to locate unknown subsurface utilities prior to constructing a new structure on the site.

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GPR Explained

What is ground penetrating radar?

Ground penetrating radar (GPR) is a non-destructive detection and imaging method which can be used to identify subsurface elements either underground or within a surface such as concrete.

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CCTV Robotic Crawler Discovery Of Major Voids & Corrosion

A customer recently had a pothole surface in their parking lot. The customer was not sure what the root cause of the pothole was and decided to call our CCTV pipe inspection services department to use the cctv robotic crawler system in the surrounding storm pipes.

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Electromagnetic Investigation Method

Ground Penetrating Radar (GPR) – An Electromagnetic Investigation Method

Ground penetrating radar (GPR) is an electromagnetic investigation method. It is the technique that employs radio waves to map structures and features buried in the ground. It provides a profile of subsurface features, which can be used to determine the location of buried objects.

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Subsurface Investigation Methodology

What is SIM?

SIM, the Subsurface Investigation Methodology is a guide to using the various types of locating technologies, combined with a proven training approach to achieve a very low investigation error rate. These technologies include the electromagnetic receiver, ground penetrating radar, concrete scanners and video pipe inspection technology.

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811 phone number

What to Know About 811

It is critical to call 811 before you dig. This process usually starts a few days before you plan to start a new project. The 811 phone number is a toll free nationwide number and should always be called before starting any type of digging project. Be sure to look at your own state laws because most require two to three business days before excavating.

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EMI Electromagnetic Induction

Electromagnetic Induction (EMI)

Electromagnetic Induction (EMI) is the most widely used technology for locating buried services and is very effective in most soil types and conditions. With EMI technology, you can locate and trace utilities, as well as estimate their depths.

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X-Ray Vision

X-Ray vision isn’t just for superheroes. Underground utility contractors have it too…or maybe the next best thing: Advanced Utility Detection Technology. Our sub-surface infrastructure is truly a world of its own. A snapshot of a typical urban underground system reveals a complex network of communications, gas, electric, and water/sewer services that originated in the early 20th century.

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The Lateral Launch

Lateral Launch is another variation of our robotic crawlers. The lateral launch system is similar to a standard robotic crawler, but it has a mechanical push camera attached that can be launched into the laterals from the main line. Lateral launch fills the gap where there are laterals off the main line that crawlers or push cameras cannot inspect alone.

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Say hello to my little friend – the robotic crawler

Video Pipe Inspection is a method of visually inspecting a utility line to detect cracks, infractions, blockages, and the overall structural condition of the line. It is also used to locate service laterals and obstructions in the line. The process of Video Pipe Inspection involves navigating a camera through the line, either manually or via a remote control, which provides a video feed of the pipe interior to an on-site monitor for viewing.

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The Booming Vacuum Excavation Industry

The market for vacuum excavation is expanding in all directions. What was once the realm of smaller contractors with one truck doing sub-contract work for larger contractors, the industry is now seeing more and more of the large contracting firms adding vacuum excavation to their portfolios.

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Using Video Pipe Inspection

Video Pipe Inspection is a method of visually inspecting a utility line to detect cracks, infractions, blockages, and other imperfections in the line. The process involves navigating a camera through the line, either manually or via a remote control, which provides a video feed of the pipe interior to an on-site monitor for viewing.

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A Day in the Life of a CCTV Robotic Crawler

CCTV is a powerful tool for inspecting underground pipelines. The combination of advanced camera technology, software and robotics is an extremely smart solution for pipeline inspections and problem-solving. It takes the guesswork out of pipe inspections, enabling quick, accurate examination of drains, sewers and other pipelines without causing any damage to the infrastructure.

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Previously Undetected Utilities Located

We were recently asked to locate utilities in an area that had previously been located. The customer was aware of a few utilities, and plans showed their basic layout, but their exact locations and depths were needed. Based upon the customers understanding that not many utilities were to be found within the scan area, we scheduled the work for two hours of scanning.

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Post Tensioned Cables Located Prior to Drilling

Prior to drilling and installing over 100 anchor and concrete core locations for new plumbing, electrical and HVAC systems, a local general contractor subcontracted Ground Penetrating Radar Systems, LLC to scan and locate post tensioned cables throughout the entire store.

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Abandoned Underground Pipelines Located

Prior to excavating and trenching for over 100 wind turbine foundations, 17 miles of access roads and 51 miles of collection lines, a major wind energy contractor subcontracted Ground Penetrating Radar Systems, LLC to locate active and abandoned underground utilities throughout the entire project area.

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Concrete Scanning in Atlanta

GPRS was called to our site after the general contractor had discovered that a number of electrical floor boxes had been covered over during the concrete pour. The pour was a 12” thick, elevated concrete slab.

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