GPRS Hired to Conduct Investigation to Verify Existing Underground Storm Water Detention System

Ground Penetrating Radar Systems, Inc. (GPRS) was recently called to a project in Ann Arbor, Michigan.  The purpose of the investigation was to verify an existing underground storm water detention system.  In order to obtain proper building permits to move forward on the construction project, the contractor had to prove that the system was installed per engineering specs.  Rather than dig up and potentially compromise the system, the contractor called GPRS for help.  For the GPR portion of the survey, a 400MHz antenna with the SIR-3000 processing unit manufactured by Geophysical Survey Systems, Inc, (GSSI) was used.  The average effective penetration depth encountered during the GPR survey was approximately 8.0 feet below ground surface (bgs).  The GPR survey area was conducted in an east/west and/or north/south direction using approximate 5.0 foot surface grid spacing.

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Site Plan Depicting the Survey Area and Findings (Note: Measurements are Approximate)

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GPR Data Screen Shots (Note due to screen limitations, two screen shots were required to display entire retention system)

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View of survey area facing northwest.  Note laterals identified in the field with orange paint and white flags.

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View of Brian Chmielewski conducting GPR survey and marking laterals with orange paint and white flags.

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Additional view of Brian Chmielewski conducting GPR survey using the 400 MHz GPR antennae.

GPRS, Inc. also has the capabilities of locating conduits, rebar, and post tension cables in a concrete slab.  For more information, to request a quote or to schedule your next project, please contact Brian Chmielewski at 517.512.0018 or by email at brian.chmielewski@gp-radar.com.  For a complete listing of our nationwide locations visit www.gp-radar.com.

A Structural Engineer Relies on GPRS to Confirm Rebar Spacing, Depths, and Size

Ground Penetrating Radar Systems, Inc. – GPRS – of Southern California was contacted by a structural engineering firm to confirm the rebar spacing, depth and size. Multiple locations were scanned throughout the perimeter of the building and all findings were marked with blue painter tape. Test cores were also to be performed in each area scanned as the building is a historical landmark and all of the rebar was to be preserved. We documented all findings and provided the customer with a Summary of Findings that same afternoon.

GPR mapping is a great tool to scan for post tension cables, rebar, and conduits; it can also be used to locate underground utilities prior to digging or excavating. GPRS has offices throughout the entire state of California and performs projects in cities like; Ventura, Santa Barbara, Thousand Oaks, San Luis Obispo, Bakersfield, Lancaster and the greater Los Angeles area. For more information, to request a quote or to schedule your next project, please contact Freddy Espinal at 805-729-5877 or freddy.espinal@gp-radar.com.  For a listing of our nationwide locations visit www.gp-radar.com.

A Structural Engineer Relies on GPRS to Confirm Rebar Spacing, Depths, and Size

Crane Placed Safely on Solid Ground After GPRS Scans for Possible Voids

GPRS was contacted by a construction company to locate underground voids at a site in Chicago, IL. The customer was planning on placing their crane in a designated area and needed to make sure the pads for the outriggers were going to be placed on solid ground. The technician on site, Brian Cox, used GPR to detect voids and informed the customer where it would be safe to place their crane.

For GPRS applications in eastern Iowa and northern Illinois, including the Chicago and Rockford areas, call 312.882.0429 or 815.218.1122 or email brian.cox@gp-radar.com.

Crane Placed Safely on Solid Ground After GPRS Scans for Possible Voids

Google Earth Map Provided of Utilities at a Petroleum Tank Farm

Google Earth Map Provided of Utilities at a Petroleum Tank Farm

GPRS of Oklahoma was recently contacted by a construction company that was hired to install a new drainage infrastructure in two manifold areas of one of the largest petroleum tank farms in the U.S.  The team that was working to install this new drainage infrastructure needed to maintain the integrity of these important systems.  Before digging in these areas, the underground utilities needed to be identified and marked so they could be avoided.  Ground Penetrating Radar, with assistance of radio detection (RD), was used to properly detect the utilities so the team could safely work in and around the manifolds.  Andy Dermer – GPRS Oklahoma – examined the areas in question and mapped out the obstructions so they could dig with ease.  The map shown above is the deliverable that GPRS makes available to clients who not only need utilities flagged on the surface, but also need a reference for future projects.

For underground utility locating in Oklahoma: Oklahoma City, Midwest City, Bethany, Moore, Guthrie, Norman, Stillwater, Enid, Yukon, Shawnee and Edmond areas call 405.439.6787 or email andy.dermer@gp-radar.com.   For a full listing of our nationwide locations, visit www.gp-radar.com.

GPRS Arrives on Site within 24 hours to Locate Conduit and Provide Immediate Results

Ground Penetrating Radar Systems, Inc. – GPRS – of Arizona was contacted by a local contractor to locate all rebar and conduit in several concrete slabs in a downtown high rise project in Phoenix, AZ.

The local contractor had the unexpected task of relocating sewer drain lines due to floor plan changes.  Consequently, to avoid costly repairs and maintain jobsite safety, it was absolutely critical to locate all structural steel and power conduit before any core drilling would take place.  Moreover, with the urgent nature of this change, due to tight construction timeframes, it was imperative that this issue be resolved as quickly as possible.

GPRS was immediately contacted to provide digital concrete imaging (ground penetrating radar) as well as radio detection / signal induction technologies to assist in locating all conduit within the slab.  GPRS was able to survey and mark on site, in real time the locations of all rebar and conduit within the concrete slab.  GPRS was able to respond and arrive on site within 24 hours to conduct the concrete survey and provide immediate results.  This allowed the contractor to save the critical time needed and avoid delays while confidently and safely core drilling into the concrete floor.

GPRS Arrives on Site within 24 hours to Locate Conduit and Provide Immediate Results

GPR mapping is a great tool to scan areas of post tension cables, rebar, and conduits, including PVC pipes and can also be used to locate underground utilities such as water, gas, electrical, communication, sewer, and other objects prior to digging or excavating.

For more information, to request a quote or to schedule your next project in Phoenix, Tucson, Yuma, Flagstaff, Prescott, Kingman, and throughout  the entire state of contact Nate Holscher (Regional Manager) at 480.227.8614 or nate.holscher@gp-radar.com. For a listing of our nationwide locations, visit www.gp-radar.com.

GPRS Successfully Detects Location of 2 Suspected Underground Storage Tanks

Ground Penetrating Radar Systems was requested on site to perform a GPR investigation for potential UST’s onsite.  All anomalies detected with GPR indicating a possible UST were painted on the ground surface in white paint with a depth to the top of the reaction provided.  In the picture on the left, an anomaly was detected at 2 feet deep indicating a possible UST.  It was detected with the 400 MHz antenna.  The photo to the right contains another anomaly that was detected at 4 feet deep with GPR indicating a possible UST.  It was also detected with the 400 MHz antenna.

Location of 2 Suspected Underground Storage Tanks Location of 2 Suspected Underground Storage Tanks 2

For more information, to request a quote or to schedule your next project in the greater Birmingham, AL area contact Andy Foshee at 205.410.0243 or by email at andy.foshee@gp-radar.com.  For a complete listing of our nationwide locations, visit www.gp-radar.com.

Map of Utilities Provided Prior to Breaking Ground for a New Hotel

GPRS was recently contacted to locate utilities prior to breaking ground for the construction of a new hotel. Several utility lines were located and marked with both paint and flags and then recorded and mapped to create a permanent record.  GPRS uses a 400 MHz GPR antenna combined with radio detection (RD) which can follow utilities with tracer wires to locate utilities that do not conduct a current. In this case, the GPR found more than a dozen lines that could not have been located with the RD alone.

For more information, to request a quote or to schedule your next project contact Gerin St. Claire at 407.335.6588 or
gerin.stclaire@gp-radar.com.

Map of Utilities Provided Prior to Breaking Ground for a New Hotel

When Existing As-Built Plans are Inaccurate GPRS Provides an Accurate Record of Utilities

Ground Penetrating Radar Systems of Virginia was utilized to detect underground utilities at a shopping center in Chesterfield, VA.  The existing as-built plans were inaccurate. GPRS Project Manager Josiah Donaldson verified the location, depth, and direction of 60+ utilities on site that were pot-holed with no issues. In addition, a CAD file was generated along with an aerial image overlay to give the customer accurate existing records of utilities to the sub-meter level.

Accurate Record of Utilities Accurate Record of Utilities 2

GPRS of Virginia performs GPR concrete and ground scanning to locate underground storage tanks, utilities, and subsurface anomalies. Whether you are locating utilities or satisfying the bank’s questions about any subsurface surprises, GPRS has your answers.  For UST and utility locating projects in Richmond, Williamsburg, or Virginia Beach, VA contact Josiah Donaldson at josiah.donaldson@gp-radar.com or call 804-393-8744 or 757-319-1903.  For a listing of our nationwide locations, visit www.gp-radar.com.