Commitment to Safety • Reliable Results
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Penhall Technologies provides utility locating, employing both electromagnetic induction (EMI) and ground penetrating radar (GPR) for privately owned property. We can identify and locate subsurface hazards and obstructions existing in the ground. Reduce the risk and help ensure the safety of your next project by contacting Penhall Technologies for your private utility locating needs.

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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?

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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?

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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 Utility Locating Projects that Penhall Has Worked On

Locate utilities prior to excavation

Penhall of the Seattle metro area was recently contacted by an electrical company who was in charge of rerouting one or more electrical lines through the parking lot at a medical facility. The client requested a utility locate from Penhall Technologies, prior to having Penhall Company cut/excavate the desired trench for the new electrical line. The analyst initiated the scanning, keeping in mind that the cut and excavation were not going any deeper than three feet. The GPR survey covered not only the needed area, but a much larger area as well to ensure that any additional subsurface objects were not missed. Several suspected utilities and an area of shallow root systems were marked out, despite needing to work around parked vehicles, tight quarters and raised landscaping beds. Following the GPR scan, the area was swept with electromagnetic detection using the RD 7000 unit and one additional electrical utility was located. When the excavation occurred, our Penhall field operators were able to verify/confirm the presence of several utilities exactly where they were marked.

Penhall Technologies uses ground penetrating radar to locate sewer pipes

Penhall Technologies was hired to conduct a utility locate at a site in Woodinville, WA. The client was looking for underground water and sewer lines connected to the multiple-garage facility in order to connect to water supply and waste. Also, the client was looking for any obstructions underneath a portion of the building interior’s reinforced concrete slab where a drainage trench would be placed. Penhall GPR analyst employed a RD 7000 radio detection device and a GSSI 400mhz GPR antennae in conjunction with the GSSI SIR 3000 computer. A direct connection with a water meter allowed the tracing of an electromagnetic signature conducted through the pipes. The same technique was used to locate a storm drain. The analyst confirmed these findings and traced a sewer pipe from its manhole cover. The analyst also located an obstruction, likely a sewer line, approximately 3’ deep within the site’s interior. The client later expressed satisfaction with Penhall’s work.

Penhall performs private locates to find additional lines that were previously unknown to customer

private locates utility line locatorIn early May Penhall was asked to come to a site in Federal Way, Washington that consisted of two corners of private property on either side of a busy intersection. The focus of the contractor’s project was to do directional boring under the roadway, crossing from one side to the other. On one of the corners is a gas station and there was great concern about what might be present between the surface and 6 feet deep below. Utilizing the GSSI 3000 and 400MHz antenna in the 3 wheeled cart, several linear features were able to be located and marked for the customer that did not coincide with the locates done on the public portion of the properties. At lease two of the located targets led towards electrical features (signs, etc.) that didn’t provide access for a direct connect with the use of the RD 7000 (which uses electormagnetic detection) which in turn required GPR to be used. All of the located targets were marked directly on the asphalt within the desired scan areas.

Determine where water leak may be through gpr scanning

determine where water leak may be through gpr scanningA customer in western Washington needed help identifying a potential leak in water lines at their private residence.We were able to locate and mark the lines and narrowed down an area that appeared to be where the leak existed. They were able to avoid added expense of digging through their entire asphalt driveway and concrete garage floor.

Identify the location of utilities before undergoing construction

locate water line on private propertyIn Enumclaw, WA, a customer asked Penhall to locate a PVC pipe that was serving his house and barn from a well pump house.  He was planned to extend a pole building and needed to know the location of the pipe before construction could begin to avoid any costly damage.

Before undergoing excavation, ensure safety by locating utilities

Identify subsurface hazards before excavationAt an EPA Superfund site in Tumwater, WA, Penhall was asked to locate and mark utilities in an area where intrusive or excavation work was planned.

Locate utility conflicts in subgrade surface prior to installing ground rods

Locate utility conflicts in subgrade surface prior to installing ground rodsIn Quincy, WA, we performed a utility survey to locate utility conflicts in subgrade surface prior to installation of ground rods.  Our GPR Analyst scanned six 5’x5′ areas to locate and mark the lines in order for the rods to be placed in locations that were free from hazards.