Wekiva Parkway (SR 429) Subsurface Utility Engineering

T2ue reduced potential impacts to the construction schedule by accurately mapping over 41,000 linear feet of utilities, and most importantly, nearly 13,000 feet of existing utilities not previously depicted by available record information.

Growth and increased travel between Orange, Lake and Seminole Counties resulted in problematic traffic congestion on US 441 and State Road (SR) 46. To relieve congestion, the 25-mile SR 429, or Wekiva Parkway, was constructed to connect to SR 417 and complete the beltway around northwest metropolitan Orlando, providing an alternative to Interstate 4.

T2 Utility Enginers provided 3D radar tomography along with conventional Subsurface Utility Engineering and supporting survey services to collect accurate horizontal and vertical locations of existing underground utilities. The project limits comprised two areas totaling approximately 17 acres. Work was completed along the busy State Road 46, which required coordination with relevant authorities and establishing traffic controls for safety.

Following ASCE 38 Standards combined with our technical expertise, infrastructure up to 10 feet below the surface was located with horizontal and vertical accuracies within six inches of their true position.

We completed advanced designating (CI/ASCE 38-02 Quality Level B) to mark the approximate horizontal location of the subsurface utilities while obtaining electronic depth values to compare to the radar tomography results, and completed test holes (CI/ASCE 38-02 Quality Level A) with vacuum excavation equipment.

  • Visually investigated and surveyed above ground utility appurtenances
  • Scanned project areas with a 3D radar tomography (TerraVisionTM), electro-magnetic locators, and mono-frequency ground penetrating radar
  • Used a digital terrain model surface to translate 3D radar tomography depths to elevations based on the project control
  • Identified locations for test holes where major discrepancies occurred between methods used to identify the underground utilities elevations
  • Used vacuum excavations to correct the radar tomography elevations
  • Analysed and merged the data sets to represent the most accurate and precise 2D and 3D depictions of the existing subsurface utility data possible
  • Provided a complex 3D CAD representation of the subsurface environment

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