The GPRS East Tennessee office was subcontracted by an engineering firm out of Knoxville, TN to scan the University of Tennessee Strength & Conditioning gym in Knoxville, TN at their indoor sports complex facility. The firm was interested taking soil samples for analysis to determine if the subsurface could support additional weight for an expansion project. There were 6-7 locations that needed to be scanned with ground penetrating radar so that underground utilities, conduits, and reinforcing steel would not be struck when the drilling took place. The GPRS representative used a GSSI 1600 MHz antenna and a radio detection wand to scan these 6-7 locations. Each location to be drilled was scanned in a 3’x3’ radius, and bordered with blue painters tape on the surface so the drilling contractors could better understand the exact boundaries of each area scanned with ground penetrating radar. There were conduits found on this site under the slab, and upon location, they were marked on the surface with painters tape indicating what type of utility was encountered. The concrete slab was determined to have a layer of wire mesh to add reinforcement. 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 1600 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 18”-24” through concrete. Our depth penetration is greatly determined by the age of the concrete as well as the amount of reinforcing steel present. 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.