GPRS Used to Locate Utilities at 2 Schools in Nashville

Ground Penetrating Radar Systems’ Nashville, TN office was recently utilized on two separate projects to locate underground utilities at local schools.  McMurray Middle school is planning renovations and additions across the property. The environmental company hired to oversee the project hired GPRS to scan for and locate utilities not only in the areas that were slated for soil borings, but also for expansion areas.  Over the course of 2 days, GPRS scanned several acres on the school property and were able to clear the soil boring locations but also to identify several of the utilities in question, including primary water, power and gas services, secondary power, sanitary and data/comm lines to and from multiple buildings.  Working directly with the environmental company, GPRS was able to scan alternate areas when the soil boring crew hit refusal on bedrock. All findings were marked with paint/flags so they could easily be identified.

Electric, Data and Sanitary lines at McMurray on left and Gas at Marvin Wright on right.
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GPRS also recently worked with a local building contractor to locate and mark the underground gas line from the tank into Marvin Wright Elementary.  Drawings showed two gas entry points on two opposite wings of the school.  GPRS was able to locate the line from the tank to one entrance via the use of active mode electromagnetic induction.  The second line had no tracer wire but Ground Penetrating Radar technology was able to accurately locate the 2” plastic line at a depth of approximately 3’-4’, thus preserving the line from destruction by heavy equipment.

Radar technology used by GPRS
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GPRS uses non-destructive testing equipment to locate utilities, piping, power-lines, underground storage tanks, and grave sites that are unable to be seen. Using GPRS is a safe, cost effective way to make sure you can safely drill or dig and not destroy any underground utilities or determine if USTs exist on a property.

Other services we offer are: Post-Tension Cable Location, Conduit Mapping, Rebar Mapping, Void Location and more. GPRS is a nationwide 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 casey.barefield@gp-radar.com.  Also visit www.gp-radar.com for a directory, to view important information about our company, or request more information about how we can serve you on your project.

YOU’RE SAFE!

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Before the installation of a handrail for a grand staircase, Ground Penetrating Radar was brought to the future Comcast Office overlooking the new Atlanta Braves baseball stadium.

The goal was to locate all reinforcing found within the slab and to identify the post tension cables so that they would not be struck when installing the anchors for the handrail. Our GPRS consultant was able to properly identify the different types of reinforcing surrounding the nine floors of the stair case using the 1600 MHz antenna which is capable of penetrating concrete up to 18” thick. The antenna relays its signal to a SIR-3000 computer system which displays the geophysical data.

When found, the reinforcing was marked on the surface of the concrete with a wax marker per the customer’s request. This was to allow for visible marks on the surface that would still be easily cleaned after the installation. GPRS technicians can mark findings using a variety of materials including permanent marker, marking paint, flags, wax marker, tape and chalk. This allows us to showcase our results and give our customers markings that will stay for as long as they would like.

If you would like a price or quote for a slab on grade, elevated slab, or structural scan to locate reinforcing and conduits, please visit the “contact us” page at www.gp-radar.com to contact your local GPRS representative.

– Patrick Moulin, Project Manager, Georgia

Locating and Mapping Utilities for Consulting Company

Locating and Mapping Utilities for Consulting CompanyGround Penetrating Radar Systems was recently contacted by a consulting company to locate and map all utilities, as well as investigate a possible underground storage tank at their site on historic Meeting Street in Charleston, SC prior to drilling on site to collect soil samples.

GPRS used the latest ground penetrating technology to provide relevant information about critical utilities, and other potentially dangerous, and problematic areas underground while on site.

The equipment used in the survey was:

  • GSSI Ground Penetrating Radar/ SIR 3000 – This device transmits an electromagnetic pulse through the ground and displays the reflection on a screen for interpretation.
    • 400 MHz antenna – This antenna allows for GPR signal penetration 4’-8’ through the ground.
  • RD-7000 locator – This device 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 GPR.  It also allows us to detect utilities via induction or conduction with an exposed or known surface of the conductive utility.

While on site, GPRS technician James Ross, scanned approximately 2000 square feet to identify any anomalies that would indicate electrical conduits, water mains, gas lines, and any other pertinent utilities moving through the customers anticipated boring locations. After further investigation at the suspected site we were able to determine that there were underground utilities running through the proposed drilling zone. GPRS plotted the locations of subsurface obstructions directly onto the surface, and provided accurate depths giving the contractor a clear indication of where it was safe to drill borings, as well as where extra caution would be necessary.

Not only did we ensure the safety of the crew by identifying potential life threatening hazards, but also eliminated any potential costly repairs that may have been added to their project due to damaging unknown utilities.

If you would like a price or quote for an underground utility locate, slab on grade, elevated slab, or structural scan to locate important embedments, please visit the “contact us” page at www.gp-radar.com to contact your local GPRS representative.

Local Contact:
James Ross – South Carolina & Coastal Georgia Project Manager
James.Ross@gp-radar.com
843-312-6662

GPRS Clears 70 Soil Boring Locations

The GPRS East Tennessee office was subcontracted by an engineering firm out of Nashville, TN to scan approximately 114 acres in Chattanooga, TN at a newly acquired turbine manufacturing facility.  The firm was installing monitoring wells and taking soil samples for analysis.  In all, there were about 70 locations that needed to be scanned with ground penetrating radar so that underground utilities would not be struck when the drilling took place.  Over the period of multiple days the GPRS representative used a GSSI 400 MHz antenna and a radio detection wand to scan these 70 locations over multiple surfaces and terrain conditions.  Each location to be drilled was scanned in a 10’x10’ radius, and bordered with white paint on the surface so the drilling contractors could better understand the exact boundaries of each area scanned with ground penetrating radar.  There were multiple utilities and areas of interest found on this site and, upon location, each utility and area of interest was marked on the surface with paint indicating what type of utility was encountered.  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.

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The 400 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 4’-7’ through the ground in the southeast region of the United States.  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.

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Scanning the University of Tennessee Strength & Conditioning Gym

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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.

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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.