St. LouisGeolocation: 38.697, -90.4257

Terracon has been serving clients in Missouri for more than 15 years.

Terracon opened its St. Louis office in April of 1996. The office currently provides geotechnical, environmental, construction materials engineering and testing and inspection, and natural resource services. The St. Louis office presently has an office and professional staff of approximately 48 employees. The St. Louis office services a variety of sectors with specialization in brownfield/site remediation, power generation/transmission, transportation/infrastructure, telecommunications, and financial.

11600 Lilburn Park Rd.
St. Louis, MO 63146

Phone: (314) 692 8811
Fax: (314) 692 8810




Brian Porter, P.E., Environmental Department Manager

Key Projects

Brownfields Assessment and CleanupGeolocation: 37.1512, -88.732
The shell of the former Laidlaw facility, a former industrial supplier to the dry cleaning industry, is highly visible from the main route through downtown Metropolis. A cluster of decaying, abandoned buildings behind a chain-link and barbed wire fence, the site detracted from the beauty of the adjoining Fort Massac State Park and impacts the quality of life for the low-income, multi-family housing across the street. Since 2005, Terracon has helped the city obtain funding to address the site, and is currently completing an innovative cleanup of soil and groundwater contaminated with…

Environmental Oversight for Stan Musial Veterans Memorial Bridge, St. Louis, MissouriGeolocation: 38.6454, -90.1784

As a firm prequalified in hazardous waste services for the Illinois Department of Transportation (IDOT), Terracon provided environmental planning, oversight, documentation, and closeout reporting for a number of contractors working on the approaches, overpasses, and ramps associated with the Stan Musial Memorial Bridge across the Mississippi River at St. Louis.

The cable-stayed bridge, with a span of 1,500 feet, was built between April 2010 and July 2013. It opened to the traveling public on February 9, 2014. Historical industrial use along the Illinois riverfront meant that the…

I-64/Highway 40 ProjectGeolocation: 38.647, -90.225
Concerns along I-64 and I-170 related to neighborhood impacts, safety and security, air quality and noise, resulted in the recommendations to reconstruct I-64, along with proposed means of improving specific interchanges along the route. In July 2005, the new I-64 project received funding of $535 million and Terracon was selected to provide geotechnical design services for the project. Due to the large-scale nature of this project, challenges included performing field exploration work at night to minimize disruption to existing traffic patterns, numerous existing underground utilities,…

Patoka Tank Farm Expansion (PTEX) in Patoka, IllinoisGeolocation: 38.754, -89.0958
Terracon was retained to provide geotechnical, materials testing, and engineering consulting for the Patoka Tank Farm Expansion (PTEX) project. The project consisted of new construction of over 5,500 lineal feet of roadway including precast bridge members, over 3,000 lineal feet of dike construction, and four 200-foot diameter steel storage tanks with concrete ring wall foundations. MPC initially contacted Terracon to discuss the recommendations from another geotechnical consultant that was recommending ground improvement for the four tanks. Terracon reviewed this report, performed…

Pike County Wind ProjectGeolocation: 39.5662, -90.8294
Affinity Wind, LLC, developed a 30-36 MW initial phase utility scale generation facility in Pike County, Ill. Terracon provided expedited consultation services relating to acoustic monitoring and mist netting of bat species and avian point count surveys on the approximate 2,000-acre Pike County Wind project. Construction included wind-powered generators, tubular supporting towers, foundations, crane pads, access roads, underground and overhead electric collection systems, a collector substation, operations and maintenance building, and an electrical interconnection substation.

University of Missouri St. Louis Benton Stadler Science Complex AdditionGeolocation: 38.9432, -92.3327
Terracon was retained by the curators of University of Missouri-St. Louis to provide construction materials testing and structural steel inspections. The project consisted of a four-story building including a walk out basement with a footprint area of approximately 18,750 square feet and a total of 75,000 square feet.  Construction consisted of rammed aggregate piers foundations, steel framing, reinforced masonry and the site grading involved cuts of up to 10 feet. Materials testing services included compaction testing of the sub grade and select fill, observation of drilled piers,…