Earth Retention

Engineering and Materials for Your Retaining Wall Projects

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About the firm

Earth Retention provides PE-stamped retaining wall engineering, materials supply, and construction support for commercial, transportation, and institutional projects across the United States. Founded in 2009 by Chad Clark, PE, Earth Retention has grown to a team of six licensed Professional Engineers registered in 40+ states, completing 500+ projects per year and more than 25 million square feet of retaining wall designs. Earth Retention handles the full project cycle under one roof: preliminary design and constructability review, final PE-stamped construction drawings, coordinated materials supply, and RFI support through construction.

Established
2009
Team
Small
Firm type
Geotechnical Engineering · Civil Engineering

People

Chad ClarkFounder

Lance CarterChief Engineer

Capabilities

Retaining Wall Design

Service website

PE-stamped retaining wall engineering from preliminary layout through construction-ready shop drawings, delivered in-house by licensed engineers in 40+ states. Every design is led, reviewed, and stamped by Earth Retention engineers without third-party intermediaries.

  • MSE Walls (Segmental Block)

    Modular block facing with geogrid reinforcement for commercial, residential, and DOT projects.

  • MSE Walls (Precast Panel)

    Precast concrete panels with steel or geosynthetic reinforcement, designed per AASHTO LRFD for DOT and heavy highway applications.

  • Soldier Pile and Lagging

    Steel piles with timber or concrete lagging for permanent and temporary excavation support and cut walls.

  • Soil Nail Walls

    Top-down construction for cut slopes and excavation support, including tieback alternatives for constrained sites.

  • Wire-Faced Rock-Filled Walls (ER Wire Wall)

    Hot-dipped galvanized welded wire forms with geogrid reinforcement and rock fill, a proprietary Earth Retention system with projects reaching over 70 feet tall and more than 5 million SF installed.

  • Post-and-Panel Sound Barriers

    Cantilever soldier pile systems with precast concrete panels for state DOT noise abatement projects.

  • Gravity Walls
    • Rubble Gravity
    • Concrete Gravity
    • No-fines Concrete Systems For Sites Where Reinforced Fill Is Not Practical
  • Reinforced Slopes

    Geogrid-reinforced steep slopes for embankment stabilization, designed per AASHTO and FHWA guidelines.

  • Tiered and Complex Wall Systems
    • Multi-tier Wall Systems
    • Walls With Surcharge Loads
    • Walls Supporting Structures
    • Combined Systems For Challenging Site Geometry

Materials Supply

Service website

Earth Retention supplies geogrid, geotextiles, welded wire forms, facing systems, and accessories coordinated with designs and delivered to site. American-made options are available from U.S.-based manufacturers.

Construction Support

Service website

Engineering support from pre-construction through final inspection, including RFI turnaround, field modifications, and real-time problem-solving. Earth Retention serves as a Design-Assist Partner on large-scale projects, working alongside general contractors and developers during preconstruction.

ER Design Studio Software

Service website

Proprietary MSE wall design and drafting tools.

  • Vespa 2
  • Vespa 3 (NCMA, AASHTO, SSM methodologies)
  • AWall 2 (wall layouts with material takeoffs)
  • EZER Toolbar (CAD automation for retaining wall drawings)

Earth Retention University

Service website

Workshops and lunch-and-learn training for retaining wall professionals offering up to 7 PDH credits, available on-site or on request.

Industries

Highways & Roads · Commercial · Land Development · Bridges · Data Centers

Projects

I-4 Ultimate

Highways & Roads

Project details

Retaining wall engineering on the I-4 Ultimate project in Florida.

CSX Intermodal Retaining Walls

Freight & Logistics · Client: CSX

Project details

Retaining wall design and supply for CSX Intermodal facility construction.