Clean Out Locating

It can be hard to foresee all situations and plan accordingly for each scenario when constructing new buildings. Subcontractors come and go and you can’t always keep an eye on what every person does on a job site. A plumbing contractor had installed all of the necessary plumbing lines and also installed cleanouts for future lines to be installed at a new warehouse in Orlando, FL. Little did they know that after they installed everything the concrete team would cover the cleanouts and pour concrete over them. The problem was that there was no way of their knowing where the cleanouts would be for future use. They had a good idea of where they were but finding multiple cleanouts in a large warehouse can be like finding a needle in a haystack.

Fortunately for this team, they knew about Ground Penetrating Radar Systems. GPRS is a team of professionals that specializes in locating subsurface elements. This was a unique project for the Orlando team, but when it comes to problem solving, GPRS shines. After a few conversations, it was decided that we could help their team find a solution to the problem.

After arriving onsite, the plumbers had access already set up for the GPRS professional to use a lone cleanout on the outside of the building. The GPRS professional pushed a 225 ft. fish tape all the way into the sewer line. The fish tape was then energized and they were able to follow that sewer line through the building using a radio detection wand. All 225 ft. of the sewer line was marked out with blue tape. Once the line was detected, they brought out the GSSI 1600 mhz antenna, which is used for scanning concrete to detect rebar, structural steel, post tension, electrical conduits and more. In this case they scanned directly on top of the previously marked sewer line and were able to clearly identify where the cleanouts were. They were able to locate all four missing cleanouts. Once the cleanouts were identified, the plumbing team was able to have them core drilled out and accessed for future use.

Below, you will see a picture below depicting Nate Schmoe, of GPRS, Inc. scanning for the sewer line with the radio detection wand. If you would like to receive a proposal for similar work please visit the “Contact-Us” page at


Overhaul of Communications and Power Stations

Ground Penetrating Radar Systems (GPRS) Inc. was contacted to locate underground utilities by a construction company that is completing an overhaul of the communications and power stations around the Pittsburgh International Airport.

An urgent request was made by the contractor to have a same day underground utility locate done, and with over 150 GPRS technicians across the country, the request was met by the GPRS technicians out of Pittsburgh.

The job required the location of an underground power line that would be tapped into and run directly to the energy shelter to reduce redundancy and material.  Ground Penetrating Radar (GPR) along with passive and direct connect radio detection were used to locate the power line and the communication lines that crossed through the prospective trench dig path.

The GPR and direct connect radio detection methods were able to accurately locate the position of four underground lines that would impact the project.  Along with location, GPRS technicians were able to determine the depths of the lines as well.  Knowing the location and depths of the lines helped the contractor save time and eliminate potential stress, injury and additional costs for this project.  Communicating with the contractor and documenting the utility locations with clear and accurate field markings and site photos were helpful methods to ensure the safe completion of the project.

Overhaul of Communications and Power Stations
(Field markings and GPR cart with 400MHz antenna attached.)

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 the utilities privately and publicly located. Utilizing GPRS for your project will help reduce injury, reduce lost 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 also 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.

UST From the Roaring ‘20s

UST From the Roaring ‘20s

GPRS was contacted by an environmental firm to locate any potential underground storage tanks (USTs) dating all the way back to the early ‘20s prior to soil sampling. Due to either poor record-keeping or loss of records altogether, there was no documentation to support that there were any USTs present.

After further investigation with GPR, we were able to locate a UST and provide documentation of our findings to the environmental firm. Now they can safely test the soil for harmful chemicals without hitting utilities…or even worse, USTs!

Did you know that there are an estimated 21,150 underground storage tanks (USTs) within Chicago’s city limits alone! That does not include the many unknown or unregistered USTs there may be.

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.

“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.” (

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.

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 – Midwest Division
Direct: 224-563-4445

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

Mapping Utilities

GPRS of Colorado Springs, Colorado was contacted to locate and map utilities at a gas station outside of Colorado Springs prior to drilling for new monitoring wells onsite. Project Manager Shawn Selmeski completed the project for the customer. The local company had no prior mapping of utilities on the property. 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 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 a 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.

Colorado Springs

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 southern Colorado and 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

View our YouTube video:

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.

GPRS locates Underground Storage Tanks

At a residential property located in Scranton, Pennsylvania, a realtor and their client contacted GPRS to conduct ground penetrating radar scans of a property to locate a possible Underground Storage Tank (UST). The realtor’s client was told the UST had been removed but wanted to conduct an investigation to be sure. GPRS was able to perform the scans in a timely manner and detect the UST which was marked on the surface in colored marking paint for further investigation.

For more information or a quote about a job in Philadelphia, Allentown, Southern New Jersey, and Delaware contact, or call (609)350-9651, and visit our website at

GPRS locates Underground Storage Tanks

GPRS Scans for Post-Tension Cables and Conduits in Slab

Ground Penetrating Radar Systems’ Nashville, TN office recently worked with a local plumbing company to help them locate several areas suitable for core drilling through an elevated concrete slab.  Working in a new residential building in The Wedgewood area of Nashville, a plumbing company needed to re-position several proposed core drilling locations to accommodate drains and water lines for kitchen and bathroom amenities.  Many of the current locations were in or under existing walls and/or beams, making the prospect of coring in these areas very difficult.  Rather than accept this risk or expend extra time and resources to have the site plans revised, the plumbing company coordinated with GPRS to scan the proposed areas and mark out rebar, post-tension cables and conduits directly on the slab. GPRS worked to troubleshoot the locations and, when necessary, advised moving the drilling locations to lower-risk areas.  Fast and accurate, the GPRS scanning method prevented any further delays to the project that would have been caused if the plans had to be re-engineered and re-designed in order to reduce risk of striking reinforcement in the slab.  Scanning and interpretation are in real-time, so project managers can instantly receive results, relay them to their team members, and make necessary adjustments on site without causing any delays.

GPRS uses non-destructive testing equipment to locate piping, post-tension cables, reinforcement, and conduits within the slab that are otherwise unable to be seen.  Using GPRS is a safe, efficient, cost effective way to make sure you can safely drill or saw-cut and not destroy any conduits, rebar, post-tension cables, or other anomalies in concrete.

GPRS Scans for Post-Tension Cables and Conduits in Slab

Other services we offer are: Underground Utility Mapping, Underground Tank Location, Concrete Analysis, Rebar Mapping, Void Location and more.  GPRS is a nation-wide company with local project managers in over 50 cities.  If GPR services are needed in Central Tennessee, contact Casey Barefield at 615.418.4023 or  Also visit for a directory, to view important information about our company, or request more information about how we can serve you on your project.

Reinforcement Mapping

Ground Penetrating Radar Systems was contacted by architects to locate the reinforcement running through a commercial slab of concrete.  The architects were concerned of the safety issues with the load-bearing capabilities of the slab for future machinery that was going to be implemented into the warehouse. In order to safely place the machinery, the architects needed to know the amount of reinforcement in the slab, the depth of the reinforcement in the slab, and the thickness of the concrete prior to placing the machinery accurately and safely.  GPRS was able to arrive onsite within 24 hours of the requested job and safely locate the entire reinforcement running inside the slab of concrete, the depth of the reinforcement, and the thickness of the concrete throughout the warehouse.

Reinforcement Mapping1
Reinforcement Mapping2

Ground Penetrating Radar Systems used a GSSI 1600 MHz antenna for this application to locate the reinforcement. All findings were marked directly on the concrete with crayon at the customer’s request for easy interpretation and easy cleanup of the marked areas.  GPR was ideal for this application due to the active work site in the surrounding areas.  GPR emits no radiation and is safe for others to work in the area near the scan location.  All Ground Penetrating Radar is real time data that is displayed and can be marked with 1/8” accuracy as the GPRS technician is scanning.  There is no need for after-site data analysis or processing.  This application makes is easy to get quick and accurate results in a manner that does not hold up the rest of the job or anyone else operating on that job site.

For a similar scan on your job site in the North Texas region, please contact Adam Kubicki at 972.922.0223 or at  X-ray has been used to locate utilities in Dallas, Fort Worth, Plano, Addison, and Carrolton, Texas.  GPRS can also be used to locate your residential gas line, water line, sewer line, and other important utilities that can cause safety issues as well as financial.  Please contact us to discuss further details on how we can assist you on your next project.

Locating Underground Utilities

Ground Penetrating Radar Systems, Inc. – GPRS – of Southern California was contacted by a construction company in order to locate underground utilities. The scope of work consisted of scanning an approximate 20’x20’ area prior to drilling for 5 new bollards. The bollards will be placed to shield a new electrical pad that will be replacing an existing pad. We first connected to all visible conduits, transformers and stand pipes; all findings were marked on the surface with paint. We then scanned a 2’ grid in both directions with GPR and noted all depths on the surface; most findings were 2’-6’ deep. The customer was surprised to see several findings in the area which we then highly recommended to hand dig to the desired depth.

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.

Alfredo Espinal

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