GPRS Provides Contractor with Valuable Info about Subsurface Utilities, Footings, and Grade Beams

GPRS, Inc. was contacted by a General Contractor from Milwaukee to investigate an old warehouse/vehicle service center. The purpose of the ground penetrating radar (GPR) and Radio Detection (RD) survey was to locate utilities, detect buried footings, and possible grade beams. The General Contractor did not have any building plans from the owner. The General Contractor was concerned there were structural grade beams crossing into the main area as well as footings and underground utilities where excavation will occur. The old warehouse/vehicle service center is going to be renovated and changed into a children’s swimming pool facility. Knowing what lies beneath is critical for this project prior to excavating as finding grade beams and utilities by accident could cause structural problems as well as add expense to the project.

GPRS scanned the area with two pieces of GPR equipment for a more thorough survey of the subsurface. GPRS scanned with a 1600 MHz GPR antenna (concrete scanner) to identify critical targets within the slab and just below the concrete. In addition, GPRS scanned with 400MHz GPR antenna (utility scanner) for detecting deeper targets. The GPR equipment did not detect structural grade beams beneath the concrete. The GPR equipment detected 2 deep sanitary lines (over 4’ in depth) going right through the area where the pool will be put in the facility. These lines went to a manhole outside of the facility. GPRS provided depths of utilities found so excavation can commence smoothly. In addition, GPRS provided concrete thicknesses in multiple areas so the General Contractor could estimate cost for cutting and removal of the concrete. This valuable information GPRS was able to provide the General Contractor allowed for better preparation for the buildout which lead to keeping the project on schedule and under budget.

Ground penetrating radar is a great tool to scan areas for post tension cables, rebar, and conduits, including PVC pipes and can also be used to locate underground utilities prior to digging or excavating. Please contact Ground Penetrating Radar Systems – GPRS to learn how we can assist with your project. To locate rebar, post tension cables, voids, conduits, pipes or utilities in concrete or underground please contact us today.

Wisconsin GPR Expert: Christopher A. Geary – Regional Manager. Give Chris a call at 414.795.6845 or send him an email at to discuss your project today!

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