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Understanding what lies beneath the ground is essential for any construction project or asset owner. By identifying the geographic location and depth of utilities through underground utility mapping, designers and engineers can ensure their construction projects are viable and safe before any work begins.
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Our Utility Surveyors are Level 5 Utility Surveyor Certified.
PAS 128 Utility Surveys
Underground Utility Mapping:
Our underground utility mapping services are critical for:
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Design Verification: Helping designers avoid clashes or interference with existing infrastructure.
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Safety and Risk Reduction Allowing contractors to excavate with confidence, minimizing the risk of striking or damaging buried utilities.
The PAS 128:2022 Accuracy Framework
Our utility mapping services are delivered in strict accordance with the PAS 128:2022 standard, ensuring that every underground asset is detected, traced, and categorised using industry-leading GPR (Ground Penetrating Radar) and EML (Electromagnetic Locating) technology.
The PAS 128 framework is a risk-management tool that replaces "approximate" utility locations with measurable data.
By categorising findings into specific Quality Levels, we provide the clarity needed for safe, cost-effective decision-making.
Survey Methodology: PAS 128:2022 M1–M4
The "M" levels define the intensity of our geophysical search. The chosen methodology dictates the "tightness" of our GPR grid and EML search lines to ensure the detection effort is proportional to your site's risk.
Why Survey Methodology Matters
The "M" level determines how much of the site we actually scan. Generally, the higher the M-level, the smaller the gaps between our scans. For high-risk urban areas or congested footways, we move to M3P or M4P levels using 1m or 0.5m grids to ensure that even the smallest or most crowded utilities are accounted for.
The "Post-Processing" Advantage
When a survey level includes a "P", it means the data isn't just checked on a screen in the field. We take the raw geophysical data back to the office for deeper analysis using specialist software. This is essential in difficult ground conditions where "noise" can hide utility signals. By processing the data after the site visit, we can filter out interference and provide a much more reliable final drawing than a standard site-only scan.
Services Provided:
We adhere to industry-recognised specifications to locate, trace, and map subsurface utilities, including:
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Pipes
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Cables
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Ducts
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Sewers
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Surface water drainage
Benefits:
Using our underground utility mapping services offers several advantages:
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Enhanced Safety- Reduces the risk of utility strikes, which can be dangerous and costly.
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Project Efficiency- Prevents project delays and design changes by providing accurate subsurface data.
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Cost Savings- Minimises the potential for fines and reputational damage due to utility strikes.
Proceed with confidence:
By employing our advanced mapping techniques, contractors and designers can proceed with a higher degree of confidence, ensuring a smoother, safer, and more efficient construction process. Choose Benchmark Surveys for reliable and precise underground utility mapping to support your project’s success.
Digitally surveyed and marked out on site:
All of our Utility Survey Findings are sprayed on-site with coloured spray paint to represent the different utility services.Chalk can also be used if required.
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The exact locations of the services are then recorded with our survey equipment, so the client has a permanent digital record with co-ordinates of the locations of those utilities.
We will then overlay the utility survey data onto a topographic survey if the client has also requested a topographic survey, or we can overlay the data onto a previous survey the client provides.
Post processed GPR Data:
Post processing our Ground Penetrating Radar (GPR) data obtained from our advanced multi-channel GPR array. By utilising this technology, we gain access to a wealth of information beyond what can be observed solely during site work.
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With the introduction of the stream DP, we now have the capability to conduct more comprehensive investigations.
Take a closer look at the remarkable visuals showcasing the genuine dimensions of a foul pumping chamber concealed beneath the road surface. Our GPR data reveals the hidden depths of the crucial infrastructure.