Ground Penetrating Radar Systems, LLC. of Phoenix, AZ. was contacted by a general contractor to locate PT cables in a high rise building for one spot for a 2” core drill. The customer was aware of the reinforcement in the slab in this particular area from photos prior to pouring concrete, however the customer needed to be sure of what was there by using GPRS. GPRS was quick to respond to this project to help the customer in a timely manner. GPRS was able to identify all obstructions in the slab so that the customer could feel reassured that there was indeed an area in which the 2” core could be drilled. All of this was accomplished by using a 1600 antenna. By having GPRS on site for the scanning, it allowed the customers schedule to stay on time with this project and kept them from hitting any reinforcement in the concrete slab.