GPRS Scaling Skyscrapers


Don’t be fooled by the lofty view, Chicago was nick-named the windy city for a reason!

As winds are raging, GPRS scans tight spaces atop a 48-story building in Chicago, IL. We were able to map out rebar so the general contractor could safely drill anchors for future building plans.  High or low, GPRS is here to help you on any subsurface locating you need to finish your project safely and timely. Don’t hesitate to call your nearest GPRS technician today!

Scan before you plan! This ensures worker safety and saves valuable time by targeting specific areas of concern. GPRS can also provide GPS reports overlaid on Google Earth or overlay information on pre-existing CAD files for future building plans. This is all done in a safe, time efficient, non-destructive manner.

20170126_122138One of our goals at GPRS is to keep all projects on-budget and on-schedule.

GPRS assists by giving a real-time depth view of subsurface hazards such as reinforcing, utilities, conduit, underground storage tanks, voids, etc. This reduces the likelihood of subsurface obstruction strikes during core drilling, saw cutting, trenching, soil boring, directional drilling, anchoring, and other sub-surface applications.

Ground Penetrating Radar Systems uses the GSSI (Geophysical Survey Systems, Inc.) Sir-4000 technology in locating. GPRS also uses the RD-8100 Locator to locate live power and radio frequency (RF) signals underground. We can also detect utilities in or under concrete via induction or conduction with an exposed or known surface utility line.

Time is a primary currency traded on any given construction project. At Ground Penetrating Radar Systems, our everyday efficiency in operations allows us to respond to the immediate needs of our customers, often within 24 hours or less. (

For questions or quotes on any subsurface locating in the Greater Chicagoland Area with fast response times and easy scheduling, please contact:

Zack Walter
Project Manager
Greater Chicagoland Area
Direct: 224-563-4445

Also, feel free to check out our website or subscribe to our newsletter using the following link!

GPR X-rays for Structural Reinforcing on a Roof in Milwaukee, WI

Milwaukee1Ground Penetrating Radar Systems, Inc. – GPRS – of Wisconsin was contacted by a general contractor out of Milwaukee to scan areas on a roof for anchor point locations prior to installing a new cell tower on top of a high rise condo building in the Upper Peninsula. GPRS was required to scan multiple roof locations in order to identify critical targets and this led to the project staying on budget, on time, and safe. GPRS utilized GSSI’s palm antenna to get into these tight spots, a piece of equipment most companies don’t carry. But GPRS always travels with multiple tools to handle the toughest of jobs. GPRS arrived in the UP from our Appleton location NEXT DAY to provide the service. The contractor had been having difficulties with their previous scanning company and utilized GPRS on this project because of our capabilities, equipment, and rapid response to their sites. This contractor now utilizes GPRS on all of their scanning projects.

Milwaukee2Ground penetrating radar is a great tool to scan areas for post tension cables, rebar, and conduits, including PVC pipes and can also be used to locate underground utilities prior to digging or excavating.  For GPR needs in Milwaukee, Racine, Kenosha, Green Bay, Fond du Lac, Sun Prairie, Madison, Middleton, Monroe, Stevens Point, Eau Claire or anywhere else in the state not listed, contact your local GPR Expert.

GPRS’s Wisconsin Expert:
Christopher A. Geary at 414-795-6845 or send him an email at

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 Provides Contractor with Valuable Info about Subsurface Utilities, Footings, and Grade Beams

GPRS, Inc. was contacted by a General Contractor from Milwaukee to investigate an old warehouse/vehicle service center. The purpose of the ground penetrating radar (GPR) and Radio Detection (RD) survey was to locate utilities, detect buried footings, and possible grade beams. The General Contractor did not have any building plans from the owner. The General Contractor was concerned there were structural grade beams crossing into the main area as well as footings and underground utilities where excavation will occur. The old warehouse/vehicle service center is going to be renovated and changed into a children’s swimming pool facility. Knowing what lies beneath is critical for this project prior to excavating as finding grade beams and utilities by accident could cause structural problems as well as add expense to the project.

Valuable InfoGPRS scanned the area with two pieces of GPR equipment for a more thorough survey of the subsurface. GPRS scanned with a 1600 MHz GPR antenna (concrete scanner) to identify critical targets within the slab and just below the concrete. In addition, GPRS scanned with 400MHz GPR antenna (utility scanner) for detecting deeper targets. The GPR equipment did not detect structural grade beams beneath the concrete. The GPR equipment detected 2 deep sanitary lines (over 4’ in depth) going right through the area where the pool will be put in the facility. These lines went to a manhole outside of the facility. GPRS provided depths of utilities found so excavation can commence smoothly. In addition, GPRS provided concrete thicknesses in multiple areas so the General Contractor could estimate cost for cutting and removal of the concrete. This valuable information GPRS was able to provide the General Contractor allowed for better preparation for the buildout which lead to keeping the project on schedule and under budget.

Valuable Info2Ground penetrating radar is a great tool to scan areas for post tension cables, rebar, and conduits, including PVC pipes and can also be used to locate underground utilities prior to digging or excavating. Please contact Ground Penetrating Radar Systems – GPRS to learn how we can assist with your project. To locate rebar, post tension cables, voids, conduits, pipes or utilities in concrete or underground please contact us today.

Wisconsin GPR Expert: Christopher A. Geary – Regional Manager. Give Chris a call at 414.795.6845 or send him an email at to discuss your project today!

GPR Scanning SOG Prior to Saw Cutting New Utility Trenches

If it were up to you to decide, would you choose to have a concrete slab scanned with GPR before saw cutting for new utility trenches or core drilling for new floor boxes? Would you assume that all the electrical, data and utility lines are most likely well below the surface and that you wouldn’t damage any lines while removing the existing concrete? Perhaps the plan is to just score the slab on grade with the saw just an inch or two for nice even lines in the floor and then you plan to bust out the rest of the concrete with a jackhammer. Or maybe to limit the dust in the area the plan is to use a sledgehammer by hand after scoring the floor with a wet saw? At Ground Penetrating Radar Systems, we see well-intentioned decisions like these cost contractors tens of thousands of dollars in unexpected damages and subsequent delays and repair costs. It doesn’t have to be that way. If only those contractors would have called GPRS before they chose to saw cut through a concrete slab, or core drill an elevated slab or trench cut a slab on grade.

You work hard to treat people right and to go that extra mile even when it means you might have to put forth more effort than the competitor that is taking shortcuts when the client’s back is turned. Don’t let that other company, the one that may have taken a shortcut on your project, long before it WAS your project, cost you money or tarnish your reputation. Without scanning first there really is no sure way to know what lies in the concrete or how deep the utilities were placed when the floor was poured. Perhaps the space has been remodeled previously. Can you trust the information you’ve received regarding another contractors work? Scan that slab before you cut or core. Get as clear of a picture as you can of what’s below the surface. Don’t take chances. If you are a property manager, require that all of your bids for upcoming projects include scanning any concrete surfaces before drilling or saw cutting takes place. Protect yourself, the structural integrity of the property and those who use your space from needless damages and expenses by utilizing the technology that is available through Ground Penetrating Radar Systems.

By utilizing GPR technology combined with our experienced technicians at Ground Penetrating Radar Systems, you can rest assured that you did all you could to limit the liability and uncertainty within the scope of your project. GPR technology in the hands of a skilled operator can tell you how thick the slab is, whether the slab is reinforced with wire mesh and/or rebar, whether voids are present, if there are conduits in or beneath the immediate surface of the concrete, what possible utilities might be in those conduits and help you to make educated determinations as to where to place your saw cuts and what methods might work better than others to meet your desired objectives.

In the below photos, GPRS  was called upon by an Electrical Contractor working in Maple Plain MN., to scan the slab on grade and map conduits prior to saw cutting the floor as part of a renovation project.  Project Manager Troy Bartlett used GPR and Radio Detection to locate live power and other trenches with multiple conduits crossing the proposed concrete saw cuts and informed the client of their depth and locations. Many of the conduits were either in or right at the bottom of the concrete surface and many of those same conduits also carried 480 volt electric lines.  The contractor was able to avoid cutting through important utilities with the information provided them by GPRS.



For GPRS applications in Minnesota, South Dakota and North Dakota, call 320.247.0451 or 507.884.0836, or email