Subsurface GPR Scanning GPRS California  
GPRS To The Rescue In Southern California

At GPRS we often preach to all of our employees about the push to be the job site “problem solvers”, and we often step onto sites with an apparent problem that needs solving. Whether a trench needs to be dug, a core needs to be drilled, concrete needs to be cut, a pipe needs to be video inspected, or many other needs we can handle, GPRS always tries to have the answers. With the ability to solve problems all over we may “save the day” on several different occasions, but GPRS recently saved the day in a big way on a project in Southern California.

GPRS was called out by a reputable General contractor who was working on a large-scale job for a high- end client (Forbes top 150 business.) The job they were tasked with was to completely buildout two existing shell, multi- story buildings to allow the client to move into the space(s). The concrete in these buildings is reinforced with post tension, rebar, and conduit, which makes for a complicated task for any GPR scanning company. The GC decided to employ a company to perform the cutting/coring and the GPR scanning all in one, unfortunately they struck 2 post tension cables very early on in the process. The next plan was to use X-ray along with another GPR scanning firm, and once again some post tension cables were hit. As frustrations rose within the ranks of the GC’s staff, they decided to discuss the issue internally, and a project manager up in Seattle was raving about the excellent work that GPRS performed on several projects up in that area. To say the least, the PM was reluctant to use any GPR scanning firm, but did agree to give GPRS a shot.

First day on the site, and before our GPR scanners hit the deck, you could tell that tension was in the air. We had only heard a little about the history on this site, but it was apparent that we needed to rescue the hopes of GPR as a scanning technology. GPRS technicians were assigned the task of checking the holes that were previously marked by 3 other companies, and we would be giving the final say on whether the core was ok or not. With a heavily reinforced deck, GPRS was asked to identify all the reinforcement to allow the drillers to go through rebar, but avoid post tension and conduit. GPRS technicians went right to it, using the SIM (subsurface investigation methodology) training by using the step by step systematic approach, we were able to accurately identify and mark the different targets in the concrete deck.

As GPRS was moving through the workload of over 200 cores on the 4th floor deck, we noticed the core drillers setting up over a set of holes that we had yet to scan. We asked them to hold off for just a moment so we could scan the locations. Once again, these holes had all been scanned and previously marked by other firms. After completing the scan, we identified a post tension cable running directly in line with one of the core locations. Upon informing the GC of the find they were overjoyed with the results, and since this initial site visit, GPRS has logged over 100 hours on this site with zero PT or conduit strikes. Saving the day, one job site at a time.

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


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