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CityArchRiver - St. Louis Arch Grounds

In 2011, Geotechnology, a UES Company, was enlisted to conduct a comprehensive geotechnical desk study and Phase I Environmental Site Assessment (ESA) for the JNEM (Jefferson National Expansion Memorial) grounds redesign project. Originally tasked with foundational assessments, Geotechnology’s role swiftly evolved to encompass a wide array of critical tasks crucial to the project’s success.

The scope of Geotechnology’s involvement expanded to include:

  1. Initial Geotechnical Exploration: Conducted extensive explorations, including operations within national park service grounds, soil nutrient sampling, and air vacuum extraction to locate utilities.
  2. Detailed Design and Specifications: Developed meticulous design plans and specifications for reinforced soil slopes, elevated walkways, and the new museum entrance.
  3. Water Infiltration Testing: Executed thorough water infiltration testing to assess the site’s hydrological characteristics.
  4. Construction Monitoring and Assistance: Provided crucial assistance in construction administration services, including precondition surveys, baseline vibration monitoring, and construction vibration monitoring for the historical Eads Bridge.
  5. Collaboration with Design Teams: Collaborated closely with three architect-led design teams, offering expertise and guidance for the main project, museum expansion, and ranger station development.
  6. Field and Laboratory Testing Services: Conducted rigorous field and laboratory testing services to ensure quality control and compliance with MoDOT specifications for construction materials, including crushed stone base course, reinforcing steel, and concrete foundations.

Additionally, Geotechnology facilitated a Phase I ESA, geotechnical desk study, and archaeological desk study to identify potential ground hazards and primary risks early in the project timeline. This proactive approach aimed to effectively manage risks associated with Recognized Environmental Conditions (RECs), hazardous substances, and archaeological sites within the project area.

In collaboration with Mound City Archaeological, a WBE (Women’s Business Enterprise) firm, Geotechnology conducted an archaeological study to assess historic, archaeological, and cultural properties that could be impacted by the JNEM grounds redesign.

The proposed project area, spanning both sides of the Mississippi River connected by the iconic Eads Bridge, necessitated meticulous attention to geotechnical, environmental, and cultural considerations. Through its multifaceted expertise and comprehensive services, Geotechnology played a pivotal role in laying the groundwork for the successful redevelopment of the JNEM grounds, ensuring both the preservation of historical heritage and the creation of a sustainable, safe, and resilient environment for future generations.




St. Louis, Missouri


Geotechnical Engineering
Materials Testing
Field & Code Compliance
Environmental Consulting