Before the installation of a handrail for a grand staircase, Ground Penetrating Radar was brought to the future Comcast Office overlooking the new Atlanta Braves baseball stadium.

The goal was to locate all reinforcing found within the slab and to identify the post tension cables so that they would not be struck when installing the anchors for the handrail. Our GPRS consultant was able to properly identify the different types of reinforcing surrounding the nine floors of the stair case using the 1600 MHz antenna which is capable of penetrating concrete up to 18” thick. The antenna relays its signal to a SIR-3000 computer system which displays the geophysical data.

When found, the reinforcing was marked on the surface of the concrete with a wax marker per the customer’s request. This was to allow for visible marks on the surface that would still be easily cleaned after the installation. GPRS technicians can mark findings using a variety of materials including permanent marker, marking paint, flags, wax marker, tape and chalk. This allows us to showcase our results and give our customers markings that will stay for as long as they would like.

If you would like a price or quote for a slab on grade, elevated slab, or structural scan to locate reinforcing and conduits, please visit the “contact us” page at to contact your local GPRS representative.

– Patrick Moulin, Project Manager, Georgia

Ground Penetrating Radar Scan performed at Cedars-Sinai Medical Center, Los Angeles, CA

Ground Penetrating Radar Systems, Inc. – GPRS – of Southern California was contacted by a general contractor in order to scan for reinforcing prior to core drilling in multiple areas. We scanned (3) different slabs that consisted of a 12” thick deck with rebar and post tension, a 6” deck with 12” on center rebar, and a 7”-8” deck with rebar and post tension. The contractor had asked us to scan large areas from 12”x12” areas to 5’x5’ areas for multiple proposed core drill and walker ducts. We marked all reinforcing findings with a black sharpie, and all beams were marked with red keel. We scanned approximately 7 sections throughout 2 floors and were finished within 2 hours, which gave the contractor enough time to lay out the cores and core drill that same morning.

GPR scanning is a great tool to use for post tension cables, rebar, and conduits; it can also be used to scan for underground utilities prior to digging or excavating. GPRS has offices throughout the entire state of California and performs projects in cities like; Ventura, Santa Barbara, Thousand Oaks, San Luis Obispo, Bakersfield, Lancaster and the greater Los Angeles area. Please contact Alfredo Espinal at 805-729-5877 or to learn more about ground penetrating radar and how GPRS can assist in your projects.

Photo of area scanned. To schedule service or obtain a quote, please contact Alfredo Espinal 805-729-5877 or

Post Tension Locating in Tulsa, Oklahoma

Post Tension locating in Tulsa, OklahomaPrior to the installation of storage rack system at a local warehouse in Tulsa, Oklahoma, a contractor contacted Ground Penetrating Radar Systems, Inc. to scan the areas prior to drilling approximately 1500 anchors. Jay Tate-GPRS Oklahoma mobilized to the site to perform a method of concrete scanning using ground penetrating radar within the suggested area to locate post-tension cables. Due to the portability of the GPR antenna, the radar imaging was performed quickly and accurately. Since the results were marked directly onto the surface, the customer was able to avoid any PT Cables, damage to the structure and injuries on-site. Unlike x-ray/gamma ray, Ground Penetrating Radar is time efficient, non-hazardous and able to show real time results. The energy emitted is equivalent to 1% of a cell phone, therefore, the production of the construction site can continue without any radiation hazards. GPRS is a nationwide company with technicians in every state and major city.   GPRS technicians must complete months of training in and out of the field, with its training facilities in Toledo, OH. GPRS-Oklahoma Team has more than 15 years of field experience to help your company on your next project, and help prevent the potential of a dangerous or costly post-tension strike.

“Our Mission is to provide solutions
to the critical problems our customers
face regarding the location of hidden
elements in concrete and underground.”

For underground locating in Oklahoma: Catoosa, Cushing, Drumright, Cleveland, Tulsa, Broken Arrow, Glenpool, Tahlequah, Stillwater, Collinsville, Owasso, Okmulgee, Verdigris, Claremore, Miami, Bixby, Sapulpa, Muskogee, Sand Springs, Bartlesville, Broken Arrow, Pryor, Durant, Hugo, Poteau, Stilwell, Sallisaw, Henryetta, Okmulgee, Coweta, Wagoner, McAlester, Idabel, Broken Bow, Vinita, and Nowata, Bristow, Vinita, Collinsville, Hugo, Ft. Gibson


For underground utility locating in Oklahoma: Oklahoma City, Midwest City, Bethany, Del City, Norman, Guthrie, Yukon, Mustang, Moore, Warr Acres, Piedmont, El Reno, Tuttle,  Cashion, Blackwell,  Chandler, Ponca City, Edmond, Lawton, Elk City, Weatherford, Guymon, Woodward, Enid, Alva, Clinton, Duncan, Altus, Ardmore, Shawnee, Chickasha, Pauls Valleys, Ada, Sayre, Marlow, Sulphur, Davis, Harrah, Luther, Chandler, Stroud, Cashion, Perkins area


Mapping Utilities on a Large Campus near Colorado Springs

Ground Penetrating Radar Systems of Colorado Springs, Colorado was contacted to locate and map utilities on a large campus in the Colorado Springs area.  Project Manager Shawn Selmeski was assigned the project.  The local company had no prior mapping of utilities on their campus. Both private and public utilities were mapped for the company’s records, as well as planned future construction projects.   Project Manager Shawn Selmeski recorded all utilities through a process of direct marks on the surface, then tracking those utilities with GPS for a CAD file which was delivered to the customer. Our CAD files are used for current records and to utilize in future plans.

All GPRS technicians go through extensive training to ensure that the deliverable that the customer receives is well laid out, easy to understand, and valuable.  Now that this area has been investigated, the construction company can begin excavation with a greater grasp on what is underground.

GPRS specializes in providing ground penetrating radar services to both commercial and residential clients. We are the best at what we do because that’s all we do. Our technicians are trained and experienced in using all of our high-tech equipment. Each Technician averages approximately 220 jobs per year. All field personnel complete the OSHA 10-hour construction safety course to ensure all of our work spaces meet safety requirements.  Project Manager Shawn Selmeski has worked some of the highest profile jobs in the Colorado Springs area, consisting of:

Great Wolf Lodge Renovations
Memorial Hospital Hybrid OR
Tesla Charging Station installations
University of Colorado Pueblo Library addition
Walmart Distribution Renovation
US Air Force Academy Stadium Renovation
Keysight Energy power upgrade

Project Manager Shawn Selmeski can be reached at 719-648-6689 or by email at  to assist in your project. Please feel free to reach out with any and all questions.

International Drive

Orlando has its fair share of resorts, hotels and theme parks. A new hotel is being constructed on International Drive. After finishing the exterior construction and beginning all of the interior work, the contractors were faced with having to add some additional lines into the facility that were not initially planned for. This involved them core drilling through CMU block walls. The engineers were concerned they would cut through too much structural steel in the process. So in order to avoid hitting anything when drilling, they got in contact with Ground Penetrating Radar Systems.

When scanning overhead or on walls, it can be cumbersome and slow to try and use the standard issue 1600MHz antenna. In order to be able to move more quickly and be able to scan in some tighter areas, the GPRS professional assigned to the job used a “palm” antenna which is specifically designed for this. This antenna can scan closer to walls and is ideal when scanning beams and columns.

After arriving on-site, the GPRS professional was able to scan all necessary areas and mark out the rebar layout on the surface of the walls. This enables the contractor to assess the best locations for their core drills to avoid contact with structural steel and keep the engineers happy. Upon completion of the job, the findings were explained to the site contact, at which point, the contractors requested a report to show the engineers and have proof of the locations for their records. The contractor was able to drill all necessary holes without affecting the structural steel in the walls.

You will see a picture below depicting Nate Schmoe, of GPRS, Inc. scanning the CMU block wall surface.

If you would like to receive a proposal for similar work, please visit the “Contact-Us” page at
International Drive

GPRS Used to Help Core Drillers Miss Conduits

A General Contractor had a project in Boston, MA inside of a Visionworks store that was being expanded into the unit next door. The scope of the project was to saw cut trenches in multiple locations in order to run electric lines. The saw cutters did not want to hit any conduits or any shallow utilities while trenching. The General Contractor decided to contact Ground Penetrating Radar Systems of Massachusetts after learning that they have been in business since 2001 and each technician has the experience of performing over 350 surveys per year. GPRS was able to complete the investigation the next day and allowed the project to proceed without hitting a single conduit or shallow utility. GPRS uses real time applications and are experienced enough to be able to locate all of the conduits and reinforcing, and was able to distinguish between reinforcing and conduits to make sure nothing of importance was cut into.

Each conduit was found, all reinforcing was marked and given a depth. GPRS Technicians also utilize a Radio Detection device in order to be able to detect all live power and radio frequencies. The General Contractor now had the information they needed to proceed with the project without causing any delay in business. The General Contractor was enamored with the quality of work that was performed and the timely, efficient manner in which it was done.

Before saw cutting, trenching, or coring in Massachusetts, Rhode Island, Vermont, Maine & New Hampshire, contact Project Manager of GPRS, Eric Fish, at 401.474.4505 or You can also visit us on the web at
GPRS Used to Help Core Drillers Miss Conduits1
GPRS Used to Help Core Drillers Miss Conduits2

GPRS Performs Investigative Concrete Analysis

GPRS Performs Investigative Concrete AnalysisA contractor was doing some remodeling at a local hospital in the downtown Chicago, IL area.  Several cores were needed to run new gas and water lines from the floors below.  The contractor contacted Ground Penetrating Radar Systems of Chicago to perform concrete scanning around these core locations.

The contractor wanted to know if there were any unknowns already existing in the concrete that they would need to avoid when performing the coring.  At this location the floor was pan deck/metal decking with a wire mesh reinforcement.  The client was not concerned with the wire mesh, but did want to know where the highs and lows of the decking and any other unknowns.

GPRS scanning assists contractors by reducing the likelihood of subsurface obstruction strikes during drilling, cutting, trenching, anchoring and other sub-surface applications. Additionally, scanning can save valuable time by targeting specific anomalies/reinforcing/unknowns to be uncovered and provide depth and location as well as information about the surrounding concrete. Using GSSI Sir-3000 technology, Ground Penetrating Radar Systems located the highs and lows of the metal decking along with an unknown running through the area where the cores were to be placed.

This was all done in a safe, time efficient, non-destructive way.  Scanning is done in real time with marks on the ground at the time of scanning.  No office/computer time to understand the results. The radar emits radiation less than 1% of that found to be emitted by standard cell phones. This means practically no hazardous radiation to operators or persons above or below the work zone which is ideal for working in settings were larger radiation sources could not be used.

GPRS specializes in ground penetrating radar and its various applications from utility locating, UST locating and concrete scanning.

When the need arises for reinforcing, conduit mapping or concrete analysis in Chicago, the greater Chicagoland area/suburbs, Northwest Indiana or any other surrounding areas with fast response times and easy scheduling, please contact John Lause at 312-485-7725 or at

GPRS Locates Electrical Conduits at Kent State University

On December 19th 2016, Ground Penetrating Radar Systems (GPRS) was requested on site by a general contractor to perform a Ground Penetrating Radar (GPR) survey at Kent State University.  The contractor needed to saw cut a trench to install new sanitary lines to replace the existing sanitary.  The contractor needed to know if there were any conduits in the area to avoid saw cutting through them.  GPRS located many live electrical conduits that would have been damaged during saw cutting operations.  The conduits were painted on the surface with depth indications so that the contractor could safely saw cut over or around them without hitting the conduits.  The site had no knowledge of the electrical conduits found.  Without GPRS on site, there could have been serious damage to the electrical lines.  Before you saw cut or core drill, call GPRS to know what’s underground!

The picture below shows live electrical conduits in red along with the contractor’s saw cutting in orange.

Kent State University1
Kent State University2



Ground Penetrating Radar (GPR)

  • GSSI SIR – 3000
    • GPRS uses a Geophysical Survey Systems Inc. (GSSI) SIR-3000 Radar unit. This is the most advanced GPR available. It allows for onsite interpretation, as well as stores data for later processing. This equipment is self-calibrating, allowing more precise depth and location measurements.
  • 1600 MHz Antenna
    • This antenna allows data collection to a maximum depth of approximately 18”, depending on concrete conditions

Ground Penetrating Radar Systems is the best way to ensure the locations of reinforcement and conduits prior to saw cutting/drilling through concrete.  For more information on how GPRS, Inc. can help you on your next project, please contact Micah Stair at 330-639-8933 or by email at  We also have the capabilities of locating underground utilities, UST’s, and voids.