IH-35 Construction Management

San Antonio, Texas

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Costello is providing construction engineering, inspection, and testing services for this freeway expansion project, including demolition and restructuring of overpasses, ramps, intersections, turnaround interchanges, and frontage roads. Once the IH35 improvement program is completed, all access roads from San Antonio to Austin will be one-way. Additional services include implementing quality initiatives as applied to heavy highway construction and manufacture of construction materials.

Costello is performing a comprehensive inspection and condition assessment of new construction and existing features. Additionally, we are evaluating design details with field conditions and making recommendations, considering public safety and long-term maintenance. Our team is identifying appropriate maintenance and repair of existing and temporary conditions during construction to minimize or correct deteriorating conditions.

As the Owner’s Representative, upholding engineering ethics and standards of conduct, Costello is providing the following:
  • Interpretation of construction drawings and specifications
  • Performing field inspection/testing and track work progress
  • Performing quantity calculations
  • Reviewing submittals
  • Initiating RFIs and approving field change orders
  • Managing testing frequencies
  • Resolving problems
  • Leading the work of professional and technical staff
  • Driving collaboration to ensure all aspects of the project meet the designed intent and purpose and are in conformance with the contract and specifications

Costello is using data management systems and other software to:
  • Prepare daily work reports and project correspondence
  • Track material placements and related quantities
  • Develop custom materials and testing tracking logs
  • Collaborate inspection and testing activities
  • Track acceptance information, disseminate compliance status, and resolve non-compliance issues
  • Provide additional custom applications as warranted by the project

Relevant Project Services

  • Construction Engineering Inspection and Testing

Project Size and Cost

  • 3.838 miles
  • Estimated cost $64M

Unique Project Attributes

  • Extensive floodplain
  • Project geology comprises wet-highly plastic-expansive clays

Challenges Faced

  • Economical stabilization of wet and pumping subgrade soils for temporary detours and permanent structures

Resolutions & Results

  • In cooperation with TxDOT district materials engineers, we employed blending techniques to gain stability


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Learn why working with Costello has created long-term clients, word-of-mouth referrals, and new business all over the Houston region and beyond.