On a typical consulting project, we: Work with you to get a thorough understanding of site, budget, and schedule constraints Prepare an exploration plan that accommodates your constraints, while meeting end user requirements Evaluate your site’s surface and subsurface conditions Develop specific solutions that consider… READ MORE

Structural earth/mechanically stabilized earth retaining walls and slopes Soil nail retaining walls Cantilever soldier pile retaining walls Landslide mitigation Ground improvement ZGA specializes in the design of structural earth and mechanically stabilized earth retaining walls and slopes. One of our principal engineers, Rob Ross, has… READ MORE

ZGA personnel have completed hundreds of Phase I Environmental Site Assessments, site characterizations, and cleanups throughout Washington, Oregon, Idaho, and Alaska. We have developed cost-effective work plans, sampling and analysis plans, and remedial action plans to complete subsurface assessment and cleanup of contaminated sites for… READ MORE

Our construction phase services include: Site grading, including field observation, field testing, and supporting geotechnical laboratory testing Shallow foundations Deep foundations, including load testing and data analysis Ground improvement Retaining walls, including load testing observation and data analysis Stormwater infiltration system verification testing RFI support… READ MORE