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

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

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

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


Seattle Concrete Scanning Projects that Penhall Worked On

Ground penetrating radar locates P.T. cable before anchoring bolts to a slab

A contractor on a project in Bellevue, WA hired Penhall Technologies to perform GPR concrete scanning. The client wanted to safely anchor a trash compactor to the slab of a trash room. The anchor bolts required approximately 3” embedments based on the specs. After scanning, it became obvious that the client had to come up with some other solution. Findings showed post tension cables running directly throught that area of the slab in large bundles, and at only approximately 3” deep. This means that the anchors would easily infringe upon the post tension location in slab and risk damaging them.The customer was grateful to have saved time and money by scanning first.

Penhall Technologies performs concrete scanning at Sea-Tac Airport in preparation for installing signage at Arrivals area

concrete scanning in washington stateA client at Sea-Tac Airport called Penhall’s Seattle branch to come and complete six, two foot by two foot areas in preparation for core cutting and insertion of signage along the curbside at the arrival pickup area. The majority of the scan went smoothly with only one hiccup, a possible conduit running through the selected area. The problem area was discussed with the client and the data was logged into a report. The contact was pleased with Kent’s findings. The client was so pleased with Kent’s work start to finish that he referred him to another company that was also in need of the service.
This customer needed scans to be done on two levels, the bottom of a waffle pored slab for any hazards for small core cuts and seismic bolts; as well as eight proposed sites near large columns for two and one-half inch cores for electrical pipes. Although the scans on the waffle slab were successful, this was not quite the case with the column scans. These sites had extremely low data visibility, limited space for movement for my GSSI Mini XT, and difficultly in accessing the areas needed for the scan. The main reasons for the data collection issue was the slab pour which appeared to be nearly three to four different pours with a total thickness of twenty- four inches, the scanner’s visibility suffered greatly only allowing to see at a depth of 8 inches. Even with additional scanning of the top of the slab sufficient data could not be found to allow the customer to move forward with cutting. The analyst provided a suggestion of seeking x-ray services to obtain the answers they were needing prior to coring. At the end of the day, the customer was happy with Seattle based analysts’ resolve and tenacity in trying to find the data that was needed.

Determine the integrity of a structure in preparation for addition to building using GPR concrete scanning

locate rebar and cables with concrete scanning In April, over the course of 3 visits, Penhall Technologies completed scanning for our customer who wanted to locate rebar and post tension cables within specific areas on multiple levels of a parking structure. The equipment used was the GSSI SIR3000 and Palm antenna. Due to the location chosen, there was no concern of there being conduit in the slab. The scan data will be used to support engineering and architectural documents in deciding if the current structure can support the additional construction of a proposed structure that plans to be erected. This customer also chose several smaller locations within the larger scan areas to completely expose the rebar and post tension cable heads to verify that no degradation of the steel had occurred that would impact the building integrity. Pictured are the two largest areas (3 ½’ x 40’ each) as well as one of the chipped out areas with exposed rebar.

Ground penetrating radar used to locate rebar and conduit before cutting a trench

Ground penetrating radar to scan for conduit and find rebarIn Shelton, WA, Penhall was requested to scan an area prior to performing a saw cut and removal of a 2′ x 10′ x 10″ concrete trench. We used ground penetrating radar to locate conduit and find rebar in order to ensure that it was safe to trench.

Concrete scanning used to locate hazards before core drilling

Concrete scanning to locate hazards before core drillingAt a location in Seattle, WA, Penhall used ground penetrating radar to identify hazards within a barrier rail. After scanning, it was now safe to core drill 50 holes to a depth of 18″.

Locate all obstructions before a large core drilling projects to ensure safety

gpr scanning used before core drillingFor this project, Penhall was asked to scan for obstructions in 13 different areas at a site in Seattle, WA.  We used GPR scanning in preparation for core drilling. The multiple scan areas were spread out over 10 floors on slabs up to 6” thick.