HYUNDAI LOUISIANA STEEL MILL

Supporting a Landmark Industrial Investment on the Gulf Coast

Eustis Engineering L.L.C. is proud to play a key role in the development of Hyundai Steel Company’s Louisiana Steel Mill (LSM), one of the most significant industrial investments along the Mississippi River corridor in recent decades. From early feasibility through detailed design and construction support, Eustis Engineering has served as Hyundai’s geotechnical partner, providing the data, analysis, and recommendations needed to move a complex site from concept to reality.

Located in Modeste, Louisiana, the LSM project is being developed on a large tract of former agricultural land underlain by challenging Gulf Coast soils. The scale of the facility, combined with soft alluvial and backswamp deposits typical of the region, required a comprehensive, phased geotechnical approach. That challenge aligns directly with Eustis Engineering’s decades of experience delivering geotechnical solutions for major industrial facilities throughout the Gulf South.

A Phased Geotechnical Program from Concept to Construction

Eustis Engineering’s involvement began during the early work and feasibility stages, when Hyundai required a clear understanding of subsurface conditions to inform site layout, ground improvement strategies, and preliminary foundation concepts. Initial field investigations included soil borings, cone penetration testing (CPT), seismic measurements, test pits, and groundwater monitoring. These efforts culminated in a geotechnical report that established baseline soil stratigraphy, groundwater behavior, and preliminary project engineering analyses.

As the project advanced, Eustis Engineering supported Hyundai through multiple phases of expanded exploration, responding to evolving design needs and an aggressive project schedule. The Phase 2 exploration program significantly increased the density of subsurface data across the site, incorporating over 270 additional exploration locations consisting of soil borings, CPT’s and seismic CPT soundings, electrical resistivity testing, thermal resistivity testing, test pits, and long-term groundwater monitoring. This expanded dataset allowed for refined soil zoning, improved settlement modeling, and more efficient foundation and ground improvement designs.

Ground Improvement and Foundation Design for Long-Term Performance

A major component of Eustis Engineering’s scope focused on ground improvement design for large material storage yards. These areas impose high loads over wide footprints, making consolidation settlement and stability key design drivers. Eustis Engineering evaluated multiple ground improvement strategies and developed detailed recommendations including preload programs, prefabricated vertical wick drains, drainage blankets, instrumentation plans, and construction sequencing.

In parallel, Eustis Engineering provided foundation recommendations for plant and structural areas, evaluating both shallow and deep foundation options. Using site-specific laboratory testing, CPT correlations, and regional experience, the team developed allowable bearing capacities, pile and drilled shaft recommendations, lateral pile response analyses, and settlement estimates tailored to Hyundai’s performance criteria.
Throughout the process, Eustis Engineering worked closely with Hyundai’s engineering and construction teams to align geotechnical recommendations with structural design, construction logistics, and regulatory requirements, particularly those associated with proximity to the Mississippi River levee system.

Construction Support and Ongoing Collaboration

Beyond investigation and design, Eustis Engineering’s role extends into construction-phase support, providing guidance on site preparation, fill placement, drainage, ground improvement monitoring, and foundation installation. Instrumentation and monitoring programs were developed to track settlement and stability during preload operations, allowing construction to proceed with confidence and data-driven decision-making.
This long-term engagement reflects Eustis Engineering’s commitment to partnership, not simply delivering reports but supporting successful execution of complex industrial projects from start to finish.

Eustis Engineering is honored to contribute to a project of this scale and significance and looks forward to continuing our work alongside Hyundai as the Louisiana Steel Mill moves into full operation.