Connect with 4Sight to discover how a rigorous test hole program can reduce risk and strengthen the data behind your next project.
When subsurface utility data needs to move beyond designation and into verified fact, vacuum excavation is the method that delivers it. As part of the Quality Level A (QL-A) process defined under ASCE 38 standard, test holes provide direct physical confirmation of a utility's precise location, depth, size, material, and condition. This is information that no other method can replicate with the same level of certainty. QL-A represents the highest standard of subsurface utility data collection within the ASCE 38 framework, and is the definitive step in eliminating uncertainty from the subsurface record.
Vacuum excavation is a safe, non-destructive technique that uses high-powered vacuum systems to remove soil and debris without damaging underground utilities or surrounding infrastructure. Where surface conditions require it, coring and other specialized methods are used to penetrate and restore asphalt, concrete, and other materials cleanly and efficiently.
Both dry/air vacuum systems and hydrovacs are utilized depending on site conditions, ensuring the right approach is applied for every situation. Once a utility has been exposed, all relevant data is captured, documented, and incorporated directly into project drawings and the final Subsurface Utility Engineering (SUE) report. Following verification, professional surface restoration is completed as standard, returning the site to its original condition with minimal disruption.
Why Partner With 4Sight
Accurate test hole data is only as valuable as the process behind it. 4Sight brings the expertise, discipline, and documentation standards to ensure every QL-A verification is defensible, repeatable, and fully integrated into the project record.
What Sets 4Sight Apart
1. Verified Data You Can Build On
Every test hole is executed as part of a structured, documented process. Utility attributes are measured, recorded, and cross-referenced to ensure accuracy before findings are incorporated into design deliverables.
2. A Regimented, Repeatable Approach
We apply a consistent system across every test hole program. This discipline means data is collected the same way every time, reducing variability, supporting quality control, and giving project teams full confidence in the results.
3. Multiple Checks, Every Time
Where possible, measurements are taken and verified through more than one method. If the numbers do not add up, we investigate until they do. This rigour protects the integrity of the data and the decisions made from it.
4. Proven Experience on Complex Projects
4Sight has supported QL-A programs across municipal, transportation, utility, and large-scale infrastructure projects.
5. Integrated Into the Broader SUE Process
Test hole findings do not sit in a silo. We ensure verified utility data is coordinated directly with designation, survey, and design teams, so the full subsurface picture is accurate, complete, and ready to use.
6. Minimal Disruption, Professional Restoration
From surface coring through to reinstatement, 4Sight manages the full process. Sites are restored to their original condition as standard, keeping projects on schedule and communities on side.
Ready to find out more?
Contact
P: 1 (289) 385-3303
E: info@4SightUE.com
Address
Headquarters
4Sight Head Office
2100 Forbes Street, Unit 1
Whitby, ON
L1N 9T3
126 Market Street
Commercial Unit #1
Philadelphia,
PA 19106
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