Post Tension Cables Located Lakewood, CO

Ground Penetrating Radar Systems, Inc. of Denver, CO was recently contacted by a local contractor to locate reinforcement and conduits in a concrete slab on a roof located in Lakewood, CO. GPRS Project Manager Ryan Shannon was able to locate rebar, conduit and post tension cables in the slab prior to the customer drilling several holes for anchors to install new anchor points for the window washers. GPRS, Inc. arrived on site to provide concrete imaging (Ground Penetrating Radar) for the customer, keeping the project on schedule without repairs or any other possible problems.

lakewoodGround Penetrating Radar was ideal on this site as it was on the roof of an office building with many people on site working below. It was important that this project not disrupt the tenants that were trying to accomplish their jobs. GPR does not require evacuation as with traditional x-ray. Ground Penetrating Radar, (Concrete Imaging) emits no radiation and is completely safe to be around. Traditional x-ray is mostly done after hours; GPR can be done during normal business hours. All data findings are marked directly on the surface at the customer’s request for the easiest interpretation of the scanning provided.  With GPR there is no wait for developing films as with traditional x-ray. Only one side of the slab is needed for scanning so time and resources are much more ideal for tight schedules of projects. Ground Penetrating Radar is the new way to x-ray!

Ground Penetrating Radar Systems, Inc. specializes in GPR service and is our primary source of revenue. With that in mind, regarding the amount of experience and specialization of concrete imaging and investigations as well as a nationwide network of technicians, GPRS, Inc. is unrivaled in the industry. GPRS, Inc. can supply your project with the safest and most accurate ground penetrating radar service in the business. Your safety is our main goal at Ground Penetrating Radar Systems, Inc. We are the experts in GPR.

If you are interested in learning more about our sonar imaging capabilities or other Ground Penetrating Radar applications such as locating Utilities and sub-surface anomalies along a proposed pipeline trench, locating Underground Storage Tanks (USTs), clearing boring locations of possible utilities for soil samples, void detection or even structural investigations. Don’t hesitate to contact us for a demo or lunch and learn – let us buy your team lunch so we can tell you more about our company and what we can offer your company and projects. Ground Penetrating Radar Systems has an office local in Denver, CO serving all of Colorado and Wyoming as well as local offices in Salt Lake City UT, Albuquerque NM, Phoenix AZ, Omaha NE, and Kansas City as well as offices in nearly every major city in the United States. Contact Adam Rock at 303.775.8270 or today to schedule an appointment or free demo.

Concrete Scanning & Utility Locating at Major Hotel on the Las Vegas Strip

On November 3rd, 2016, the Las Vegas community and hotel community in general learned a very valuable lesson. That morning is when a contractor who was saw cutting in a basement area at a hotel on the Las Vegas Strip, cut through the main power line, completely shutting down the power to the entire building. It would take about 20 hours before the power could be fully restored. Not only did the hotel lose money by needing to stop operations of everything that day at the facility, but they also had to provide housing for the guests staying in their hotel that night. In an effort to keep these guests as customers, they also offered two free nights at their hotel in the future. Had the contractor invested in utility locating and concrete scanning prior to the saw cutting, this whole ordeal could have been avoided.


Ground Penetrating Radar Systems was called recently to scan the basement area at another of the major hotels on the strip. The scanning done by GPRS allowed the customer to confidently dig without running into any power lines, while also missing what appeared to be post tension cables in the slab. GPRS used a radio detection wand along with  400 MHz & 1600 MHz ground penetrating radar antennas to scan the areas. All of the findings were clearly marked on the surface with blue tape and discussed with the customer before digging began. Whether working on an older historic landmark, or a freshly built hospital and everything inbetween, Ground Penetrating Radar Systems can help.

Prior to saw cutting, core drilling, excavating or boring in the Las Vegas and Southern Nevada areas, be safe & get as many questions answered as possible as to what sub-surface obstructions are present. Pretty much, if you have questions about what lies beneath whatever surface you’re working on, GPRS should be able to give you a much clearer picture as to what you are dealing with. Typically able to arrive on site to begin scanning within 1-2 days, GPRS will take care of your project in a timely, safe, and accurate manner. Contact the Las Vegas GPRS Project Manager, Andrew Yates, at 702-573-9228 or


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

GPR Scanning for Post Tensioned Cables – Dallas, TX


This GPR scan took place on the edge of an elevated concrete slab on the exterior of a commercial building in Dallas, TX. The customer needed to identify the locations of the post tensioned cables running through the slab so they could safely install anchors for new glazing. Concrete reinforced with post tensioned (PT) cables can cause serious injury or damage if the cables fail as a result of being struck. The PT cables needed to be clearly marked before the customer commenced destruction of the reinforced concrete slab.

David Hagenmayer with Ground Penetrating Radar Systems, Inc., was contracted to scan the area requested and mark out all PT cables and obstructions in the concrete. David was able to determine the precise locations of the cables and the client was then able to safely and effectively drill for the anchors.

GPRS, Inc. can identify structural steel embedded in the concrete with an accuracy of (+/-) ¼”. This is important to note because there are often times when a customer has to drill in a specific location to install conduits or plumbing on refits of existing structures. The obvious benefit of having such a high degree of accuracy is we can determine the best place to drill in a highly congested area.

GPRS, Inc. of Dallas is the most trusted concrete scanning company because of its highly trained and dedicated technicians. We are the best at what we do because it’s all we do. Ground Penetrating Radar is cost-effective, non-hazardous, and provides data in real time. For GPRS services in North Texas, please call (972) 922-0223 or email We also offer nationwide service. For a local representative, please visit our website at

GPRS, Inc. offers a response time unrivaled in the industry. Often times, we can schedule your project the same day or within a few days at the most. By delivering fast and accurate service, you can be sure your project remains on schedule and within budget. Our experienced technicians set the bar and offer professional services to meet the needs of the fast-paced construction industry.

GPRS Clears 70 Soil Boring Locations

The GPRS East Tennessee office was subcontracted by an engineering firm out of Nashville, TN to scan approximately 114 acres in Chattanooga, TN at a newly acquired turbine manufacturing facility.  The firm was installing monitoring wells and taking soil samples for analysis.  In all, there were about 70 locations that needed to be scanned with ground penetrating radar so that underground utilities would not be struck when the drilling took place.  Over the period of multiple days the GPRS representative used a GSSI 400 MHz antenna and a radio detection wand to scan these 70 locations over multiple surfaces and terrain conditions.  Each location to be drilled was scanned in a 10’x10’ radius, and bordered with white paint on the surface so the drilling contractors could better understand the exact boundaries of each area scanned with ground penetrating radar.  There were multiple utilities and areas of interest found on this site and, upon location, each utility and area of interest was marked on the surface with paint indicating what type of utility was encountered.  Depths were provided if located with ground penetrating radar.  All findings were reviewed with the site contact after the ground penetrating radar inspection and any locations that had to be moved due to utilities in the direct path were communicated with the site contact.  Details of the inspection were also reviewed with onsite personnel so that they could update their site drawings for their records.


The 400 MHz transmits an electromagnetic pulse through the ground and displays the reflection on a SIR 3000 head unit for interpretation.  This antenna allows for ground penetrating radar signal penetration of 4’-7’ through the ground in the southeast region of the United States.  Radio Detection RD-7000 locator is a device that detects live power and RF signals underground, allowing us to locate electrical or telephone lines even if they are below the minimum size requirements to be detected by ground penetrating radar.  It also allows us to detect utilities via frequency induction or conduction with an exposed or known surface of the conductive utility.


GPRS Ensures Safe Excavation

Ground Penetrating Radar Systems (GPRS) Inc. of Pittsburgh was contacted by the owner of a private residence to locate utilities on the property to ensure safe excavation for the installation of a retaining wall around the driveway.

Ground Penetrating Radar (GPR) was used to locate the existing gas lines from the valve near the street to the gas meter at the house.  The GPR was able to clearly see 4 feet into the ground to locate the line at 2.5 feet.  A foreign line was also located which, when excavated, turned out to be an inactive gas line that was previously replaced.  Both of these lines crossed into the work area which, if left undetected, could have potentially led to a dangerous accident.

For this residential utility locate job, the GPRS technician also used radio detection and induction methods to locate the water line and sewer lines into the home.  These methods require the technician to directly connect to a conduit with wire passing through it or a metal line and send a signal along it.  The water and sewer lines were found to not pass through the work area, giving peace of mind that no interaction with these utilities was possible and costly accidents due to hitting these lines were not going to occur.

Using these methods, the GPRS technician was able to locate the gas lines, water line and sewer line at the residence.  With the field markings clearly in place and communicated with the owner and the construction foreman, excavation was able to be completed quickly and safely.

Water line located using induction method and flagged to indicate path.

Water line located using induction method and flagged to indicate path.

In construction, professionalism is everything, and completing your projects without incidents can make or break your bottom line. When you are excavating, it is important to have utilities privately and publicly located. Utilizing GPRS for your project will help reduce injury, increase productivity, and maintain incident-free professionalism that your clients demand.

GPRS uses the latest and greatest technology to locate power lines, fiber lines, water lines, UST’s, storm drains, and sewer drains under the surface. Utilizing GPRS on your project can help mitigate costly repairs, prevent severe injuries, and maintain the integrity of your project.

Ground Penetrating Radar Systems of Pittsburgh is available to service the private utility locating and concrete scanning needs of Western Pennsylvania.

Concrete Imaging Technology Utilized to Locate Reinforcing Prior to Core Drilling a House Foundation in Killington, VT

A general contractor had a project at a residential home to core drill through a house foundation in order to install multiple pipes. To install the pipes, the contractor had to core drill through multiple locations. It was essential, while core drilling in these locations, not to core through any reinforcing so as not to compromise the structural integrity of the home. Prior to beginning the core drilling process, the contractor contacted Ground Penetrating Radar Systems of New England to scan the foundation in order to locate all of the reinforcing that ran through the area. GPRS used a High Resolution 1600MHz Antenna that is able to scan concrete up to 18”-22” in thickness with incredible accuracy of +/-1/4” on the location and depth of the anomaly. After all of the reinforcing was located, the general contractor had  all of the information needed to proceed with confidence and safety.  This allowed him to safely core and relay to his client that none of the structural rebar had been damaged in the process. If you have a project where you need to locate rebar, conduit, or post tension cables in the New England Region please contact your local technician which can be found at

To learn more about the capabilities of GPRS in Massachusetts, Rhode Island, New Hampshire, Maine & Vermont, contact Regional Manager, Mark Johnson, at 617.448.8098 or

GPRS Locates PT Cables at Stadium in Tampa

Recently, Ground Penetrating Radar Systems (GPRS) of Tampa, FL was requested on-site by a general contractor to perform a Ground Penetrating Radar (GPR) survey at Steinbrenner Field in Tampa, FL. The purpose of our scanning was to locate any rebar and/or post-tension (PT) cables within the concrete securing the stadium’s seating.  We first scanned the top of the concrete slabs and found that the areas we were scanning contained post-tension cables (3” from the surface of the slab) as well as a foam layer in the middle of the concrete.  The contractor working at the stadium has plans to core drill through the concrete in order to run electrical lines from a new kitchen addition to an existing electrical room below the stands.  The contractor was worried about hitting the post-tension cables and other unknown anomalies which may have been in the 10” concrete slab.  All anomalies present were clearly marked on the surface so the contractor knew what reinforcing was in the concrete around their planned drilling locations. After this, we also scanned from below the slab to make sure there were no post-tension cables on the other side of the middle foam layer. We scanned multiple locations while on-site and explained all of our findings and markings.  The general contractor was able to safely drill his 3” holes through the slab following the completion of our scanning. Ground Penetrating Radar Systems is the best way to ensure the locations of rebar, post-tension cables and other anomalies in concrete prior to any type of excavation such as saw cutting, trenching or core drilling.  In total, roughly 15 different 24”x24” areas were scanned during this particular trip to the site.  After all findings were clearly marked on the surface, we then went back through the areas and put a clear-coat spray on our marks to make sure that none of our findings would be worn away or erased from foot traffic and other work going on in the areas. The photo below depicts Justin Rasanow, our Tampa Area Manager, scanning the portion of the stadium where the seating will be present.  He is using our 1600MHz antenna to scan the concrete slab. Along with the 1600MHz antenna we also used our RD-7000 (not pictured), which is a device that detects live power and RF signals below the surface.  This device is used in locating electrical or telephone lines embedded in concrete.  Following our scanning, the contractor was pleased that they were able to core drill all of their locations without hitting any post-tension cables, reinforcing, or conduits.


Please contact Justin Rasanow at (727) 420-3292 or for any scanning needs that you may have.