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.

Get a free quote today!

Where is the job located?

(*) City

(*) State

(*) Zip Code

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

(*) First Name

(*) LastName


(*) Email

(*) Phone


What is the best way to reach you?


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!

Maui Concrete Scanning Projects that Penhall Worked On

Concrete wall scanning is done to locate rebar and post tension cable

Scanning concrete wall for rebar and post tension cableIn Wailuku, HI, Penhall was asked to scan to locate and mark all obstructions within the concrete slab such as conduit, post-tension cables, and rebar prior to cutting three 30” x30” openings through 12” concrete wall, as well as drill three 6” cores.

Ground penetrating radar is used to ensure safety before core drilling

Scan concrete slab for rebar before drilling holesPenhall was asked to perform some concrete scanning at a Wailuku state office building to ensure it was safe to drill 12 – 1.5” cores in a the 5” suspended concrete slab on 3 balconies, 4 cores on each, of the building.

Locate and identify any obstructions in the concrete slab before installing anchor bolts

Identify obstructions in concrete using GPRA five-star hotel in Kaanapali called Penhall to scan and mark any obstructions in concrete slabs in preparation for placement of anchor bolts.

Scan concrete columns to locate vertical rebar and rings

Scan columns to locate vertical rebar and ringsAt a location in Maui, we were asked to scan (8) columns for vertical rebar and rings.  The scan areas for each column were 8-10 feet high and 2 feet wide and all work occurred on a scissor lift.

Find pre-stress cables and identify their patterns with GPR

Ground penetrating radar to scan for pre-stress cablesIn Maui, a customer hired us to perform concrete scanning of a 150 ft area through a 6 inch plank with pre-stress cables and a 5 inch topping.  Our analyst used the ground penetrating radar with the Mini HR to locate and mark the tension cables and their pattern.