Subsurface GPR Scanning GPRS California  
Utility Locating Prior to Directional Boring for Fuel Lines at the San Diego International Airport – San Diego, California

GPRS Inc. of San Diego was contacted by a local general contractor to scan for known and unknown utilities prior to directional boring and open trenching for a new fuel line near the runway at the San Diego International Airport. Due to the proximity of the runway to the work site, all scanning had to be done during a runway shutdown at night. Upon arrival, the general contractor showed the GPRS technician the approximate location of the bore path and trenching path.

Our representative onsite thoroughly investigated the areas of interest, and used a combination of ground penetrating radar, which is also known as “x-ray”, as well as traditional locating methods using electromagnetic locating, to locate all existing utilities in their path. All findings were marked directly on the surface with their corresponding depths, and explained to the site contact at the completion of the job. GPS coordinates of these lines that were found were also collected and overlaid onto a CAD file for the general contractor to refer back to throughout the project. The photo here shows an example area where multiple electrical, water, and communication lines were crossing the proposed bore path. GPRS was able to accurately identify electrical, communication, gas, water, fire water, sewer, and storm drain lines throughout the site to mitigate potential costly damages when boring or excavating.

Per normal procedure, DigAlert was contacted at the commencement of the project, but due to the majority of the work being done on a private property, 811 services were not much use to the contractor. As opposed to the normal DigAlert or 811 requests, GPRS will identify and mark private AND public utility locations, as well as give relevant depth information that these public services do not provide. GPRS can operate onsite without the use of existing as-built plans, and can account for the unaccounted for when dealing with subsurface obstacles. With the information provided by GPRS, the team designing the boring and trenching plans were able to accurately plan where to pothole to find existing utilities, and determine an unobstructed route to run their fuel lines without fear of discovering a potential obstacle during the construction phase, causing costly shutdown time and additional. Digging without hiring a third-party utility locating company can be detrimental to project schedules, project budgets, as well as onsite safety for excavators. In addition to scanning areas for utilities, GPRS also has the ability to locate any subsurface obstacle, ranging from old footing foundations, to UST’s, to unmarked graves. GPRS leads the industry with advanced technology, training, and a highly motivated team of technicians that can help with any subsurface imaging needs.

If your company needs to know what lies below the surface in any application, ranging from concrete scanning, concrete x-ray, private utility locating, UST location, or post tension location in the greater San Diego area (including San Ysidro, Alpine, Chula Vista, El Cajon, Poway, Escondido, Fallbrook, Temecula, Murrieta, Menifee, San Clemente, Oceanside, Carlsbad, Encinitas, La Jolla, El Centro, Calexico, Imperial, and Spring Valley), please contact James Petersen at (858) 395-1085 or at

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