Commitment to Safety • Reliable Results
Responsive Resources • Established Expertise

Penhall Technologies can help you locate rebar, pipes, post and pre tension cables, conduits and many other subsurface hazards that may be hidden in concrete. Our expertly trained analysts can also detect voids within or underneath concrete slabs. As a safety leader in the industry, contractors, engineers, and government agencies have come to trust Penhall first for safe and precise scanning services.

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Where is the job located?

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What services can we assist you with?

I can confirm this is a private locate. For all public locates please contact 811.

Other Service

To better help you with your request, could you kindly provide the following information:

What are we scanning? Slab on grade, suspended slab, etc.

What are we scanning for? Ex. rebar, tension cables, conduits, etc.

What is the size of the area(s) that need to be scanned? How many areas?

What is the thickness of the slab?

What is the scanning in preparation for?

To better help you with your request, could you kindly provide the following information:

What is the surface that we are performing the locate on? Ex. Ground/Dirt, asphalt, concrete, indoor/outdoor, etc.

What is the size of the area that needs to be scanned in square feet or linear feet?

How many scan locations?

What are we locating? Water, gas, electrical, sewer, etc.

How many utilities are running through the proposed scan area?

Do we have access to meters or utility boxes?

What is the locating in preparation for?

Contact Information

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Other comments or project details?

Once you submit this form, a Penhall Company representative will contact you within 24 hours. Thank you for the opportunity to earn your business!


After two different companies provided inaccurate scanning results, a general contractor turned to Penhall Technologies to get the job done right!

GPR used to locate multiple layered rebar In March, 2017 Penhall Technologies was contracted to scan on the campus of a large research laboratory. The company wanted Penhall to scan a concrete slab located above one of the research rooms so that they could locate rebar and drill into the concrete slab without hitting any rebar. Due to privacy policies, our GPR Analyst was not aware of what the scanning was in preparation for except for drilling. The analyst used the Hilti PS1000 to locate multiple layers of rebar. Penhall was contracted after two other scanning companies had already scanned the area but crews had hit rebar that their scanner missed. Consequently, the company wanted to verify that the previous scans were marked correctly and find any rebar they missed.
After peeling off a rubber sealant from the top of the concrete the GPR analyst discovered that the concrete was uneven and difficult to scan. In order to remedy this issue, the analyst made a scanning template out of cardboard to allow the scanner to evenly roll over the area that needed to be scanned. This type of innovative work is a great example of why Penhall Technologies is the top choice for concrete scanning.

We used GPR scanning to ensure safety in 100 core drilling locations

Ground penetrating radar to find rebar, post tension cables, and conduit
Penhall went to Monterey, CA to scan 100 different locations in preparation for 5 1/2″ cores. The locations for scan were both on 6″ concrete pan deck and 6″ walls.

Locate all obstructions including rebar, post tension cable, and conduit within concrete slab

marking up findings after scanning concrete
At a location in Santa Cruz, CA, we checked for obstructions, such as post tension cables, rebar, and conduit, at three locations in preparation for 6 1/2″ cores through a 7″ concrete wall in Santa Cruz, CA.