CNC Foundations installing rigid inclusions and vibratory stone columns at a commercial job site using heavy-duty drilling rigs and grout equipment. Yellow excavators with CNC logos operate side-by-side under clear skies, demonstrating ground improvement techniques for soil stabilization and deep foundation support.
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Overhead view of CNC Foundations excavator and loader installing grouted aggregate piers at the Queen Marquette Casino expansion site in Iowa, showcasing precision ground improvement in challenging soil conditions.
CNC Foundations equipment, including a drill rig and service trucks, staged at the Queen Marquette Casino site for ground improvement using grouted stone columns near a wooded bluff.
Close-up of CNC Foundations loader delivering aggregate to the drill shaft during grouted pier installation at Queen Marquette Casino, highlighting coordination and material placement.
Aerial view of CNC Foundations' active job site at the Queen Marquette Casino expansion, showing full site layout, machinery in operation, and proximity to the Mississippi River and resort structure.

SOIL STABILIZATION FOR CASINO EXPANSION USING GROUTED AGGREGATE PIERS

  • MARQUETTE, IOWA

CNC Foundations (CNC) delivered a dual ground improvement solution for the expansion of Casino Queen Marquette, a prominent entertainment and hospitality venue along the Mississippi River in Marquette, Iowa. To support the casino’s new clear-span building addition, CNC implemented a ground improvement combination of vibratory stone columns (VSCs) and grouted stone columns (GVSCs) – engineered to handle complex subsurface conditions and achieve high-performance stability beneath variable alluvial soils.

Located in a scenic and active resort environment, the site required precision and minimal disruption. By blending both methods, CNC enhanced soil performance while maintaining construction efficiency and ensuring long-term stability for the expanding facility.

  • Owner: Casino Queen Marquette, Inc.
  • General Contractor: Conlon Construction
  • Structural Engineer: NORR
  • Project Timeline: 12 Production Days
  • Project Size: 100×150 ft clear span building addition
  • Design Bearing Capacity: 2,000 psf
  • Service: Vibratory Stone Columns and Grouted Stone Columns / Aggregate Piers
  • Install Numbers: 190 piers at 5,000 linear feet
  • Market Sector: Entertainment Industry

The client required a cost-effective foundation system capable of supporting a large clear-span structure with strict settlement limits. The site’s variable fill soils, organic soils, native alluvial sand, and weathered dolomite created a challenging foundation profile unsuitable for conventional shallow footings.

Further complicating logistics, the casino remained operational throughout construction—demanding a solution that could be executed quickly, quietly, and within tight tolerances.

CNC Foundations engineered a design-build hybrid approach that addressed both soil variability and site activity constraints, maintaining the project’s budget and schedule without interrupting ongoing operations.

Subsurface investigations identified a heterogeneous profile of asphalt, concrete, fill soils, organic soil, native alluvial sands, weathered dolomite, and lean clay. These conditions presented low shear strength and inconsistent bearing capacity, requiring reinforcement to mitigate settlement and ensure uniform structural performance.

CNC Foundations combined traditional stone columns and grouted stone column system increased stiffness and load transfer efficiency across the site, providing consistent support for the new addition.

CNC Foundations installed over 190 stone columns totaling over 5,000 linear feet across the site. Using a combination of a vibratory flot and grout injection systems, stone was compacted in vertical lifts from design depth to the surface, forming dense aggregate piers that:

  • Increased allowable bearing capacity to 2,000 psf
  • Controlled settlement within design tolerances
  • Enabled rapid installation with minimal site disruption
  • Eliminated the need for deep foundations 

Completed in 12 production days, the project validated CNC’s dual-method design as an efficient, adaptable alternative to deep foundations – meeting both structural and operational goals with precision.