Project Type: Beam & Lagging

McMahon Engineering completed a wall replacement and stabilization project at the Coronado Island Marriott Resort & Spa in Coronado, California, in partnership with general contractor T.B. Penick and Sons. The project addressed a failing CMU retaining wall that required immediate structural stabilization and a long-term engineered solution in a demanding coastal environment.

The existing concrete masonry unit wall had begun to deteriorate, creating structural concerns and the potential for continued movement. Our team implemented a Bean and Lagging shoring system to stabilize surrounding soils and maintain site safety during demolition and reconstruction. This approach allowed excavation and structural work to proceed safely while preparing for construction of the new permanent retaining wall system.

The scope of work included the installation of 24 epoxy-coated 24-inch diameter piles extending up to 117 feet in length, with embedment depths of approximately 50 feet to achieve the required structural capacity. The corrosion-resistant coating was critical due to the project’s proximity to the Pacific Ocean and the harsh coastal conditions in Coronado and throughout San Diego County.

Following deep foundation installation, the existing CMU wall was demolished. 4×12 lagging was installed to retain soil and provide lateral support during construction.

Rebar was placed per project plans, along with installation of a comprehensive drainage system designed to relieve hydrostatic pressure behind the wall. Proper drainage plays a critical role in retaining wall performance, particularly in coastal Southern California where groundwater and irrigation runoff can affect long-term stability.

The project concluded with construction of a permanent shotcrete retaining wall built for durability and long-term structural performance. By combining deep foundation support, Bean and Lagging shoring, reinforcement, and integrated drainage, McMahon Engineering delivered a reliable retaining wall replacement solution tailored to the demands of a coastal resort property in Coronado, California.

The Hyatt Place project, led by Tetra Tech, brought a new level of contemporary hospitality to Los Angeles. Designed as a stylish and functional hotel destination, Hyatt Place combines modern architecture with sustainable engineering practices, offering travelers comfort, convenience, and a strong connection to the surrounding community.

During construction, McMahon Engineering was contracted to provide Beam and Lagging shoring services for the hotel’s foundation excavation. By installing soldier pile walls with timber lagging, our team created a secure earth retention system that stabilized the site during deep excavation. This solution ensured soil support, protected nearby structures and utilities, and allowed the foundation to be constructed safely and efficiently.

Our role in the Hyatt Place project underscores McMahon Engineering’s reputation as a trusted shoring and drilling contractor in Los Angeles. With proven expertise in earth retention systems and temporary shoring solutions, we helped deliver the stability and precision needed for a landmark hotel development.

The Broadstone Makers Quarter is a high-end multifamily residential development located in the vibrant Makers Quarter district of San Diego’s East Village. Built by Alliance Residential Builders, this project blends contemporary design, innovative community spaces, and sustainable urban living.

McMahon Engineering was contracted to provide Beam and Lagging shoring solutions during the excavation phase. Our team installed soldier pile walls with timber lagging to safely retain soil, protect surrounding infrastructure, and maintain excavation stability for the underground parking and foundation systems.

This project highlights McMahon Engineering’s expertise in earth retention systems and ability to deliver precise, safe, and reliable shoring solutions in dense urban environments. By supporting Alliance Residential Builders at Broadstone Makers Quarter, McMahon Engineering reinforced its role as a trusted partner for San Diego multifamily construction projects.

The Chroma Apartment Homes, developed by Fairfield Residential, is a premier multifamily community in the Warner Center district of Canoga Park, Los Angeles. This modern development features 275 apartment homes designed for contemporary living, blending boutique design with resort-style amenities including a rooftop lounge, resort pool and spa, fitness centers, co-working spaces, and creative makerspaces.

To support this large-scale project, McMahon Engineering provided Beam and Lagging shoring solutions during the excavation phase. Our team installed soldier pile walls with timber lagging to retain soil and stabilize the site for underground parking and foundation systems. This earth retention system safeguarded adjacent properties and infrastructure, ensuring excavation safety in a dense urban setting.

By delivering beam and lagging shoring in Los Angeles, McMahon Engineering reinforced its reputation as a trusted partner for multifamily construction projects. Our expertise in shoring, drilling, and earth retention systems helped Fairfield Residential move forward with confidence, building a landmark community that strengthens the Warner Center’s reputation as a hub for live-work-play development.