Don’t Stress, Call GPRS - Raleigh/Durham, North Carolina

Ground Penetrating Radar Solutions - GPRS - of Raleigh/Durham, North Carolina was contacted by a general contractor to locate all reinforcement, beams, and conduits within an elevated concrete slab in order to core drill for missed plumbing and electrical sleeves within a new building near Duke University in Durham NC. Approximately 200 areas needed to be scanned due to missed sleeves during the original pour. In order to core drill the new holes, the general contractor needed to avoid all post tension, as requested by the project engineer. They also wanted to avoid all conduits and rebar to ensure safe drilling. Ground penetrating radar (GPR) was used to scan larger areas so that the contractor would have options on hole placement. Also, the findings are marked in real time so that the contractor could work directly with GPRS to solve problems and move the cores to clear locations. GPR found the slab to be approximately 6” thick post tension slab with a mat of rebar and conduits embedded. The Post Tension was found to be running in the beams in one direction and approximately every 42” in the other direction. The rebar was found to be in a 12” on center spacing in both directions and the conduits were found sporadically throughout. GPRS was able to scan approximately 200 (2’ x 2’) areas so the client could move forward with their cores and running their pipes. Prior to GPRS assisting on this site, multiple post tension cables were hit and at one point the site needed to be shut down to assure the structure was safe.


Photo of a GPRS project manager marking out an area and the GPR findings near a proposed core drilling location following GPR scans. GPRS prides itself in the ability to keep the clients and sites safe by using ground penetrating radar. The goal when marking out an area like this is to make the markings legible and easy to understand, the above example shows the markings you would expect from GPRS. GPRS offers other services, such as locating underground utilities before drilling soil borings, digging, or excavating, as well as locating underground storage tanks or tank “graves”. If you need anything scanned in the Raleigh/ Durham area or anywhere else give us a call and we will have a SIM certified Project manager on your site as soon as possible.

In the North Carolina/South Carolina area GPRS is usually able to get a project manager out to your site to complete the necessary GPR scans within 24-48 hours depending on time of the year. To schedule service or obtain a quote, please contact Jim Bell at 919-671-9476, or MidAtlanticinfo@gprsinc.com or visit www.gprsinc.com.

GPRS does not provide geophysical, geological, land surveying or engineering services. If you need such services, please contact an appropriate professional.