Geotechnical Engineering and Engineering Geology

Our team of professionals will aid you and your design team in selecting the most suitable and economical solutions for any geotechnical issues that may arise. Depending on the subsurface conditions, budget, and project timeline, selecting the "best" approach can be critical to the successful completion of a project. We have experience in dealing with poor subsurface conditions, including soft deposits, mine shafts, manmade fills, unstable slopes, liquefiable material, and high groundwater tables.

Geotechnical Engineering and Engineering Geology Services provided by NGA includes:

• Exploration and Characterization of Soil and Rock
• Foundation Design
• Shoring Analysis and Design
• Reinforced Earth and Retaining Wall Design
• Instrumentation Installation and Monitoring
• Deep Foundation Design - Piles and Piers
• Modular Block Wall Design
• Slope Stability and Groundwater Analysis
• Landslide Analysis and Repair Recommendations
• Geologic Hazards and Bluff Studies
• Forensic Studies, Analysis and Repair Recommendations

Construction Monitoring and Laboratory Testing

NGA personnel has the certification to perform earthwork construction monitoring and we are prepared to adequately staff projects. We also have field staff who are certified to conduct erosion control monitoring. NGA also has the ability to perform in-house design, analysis, drafting for the geotechnical scope of projects. We have a fully-equipped soils laboratory where analyses of soil characteristics, composition, and strength can be evaluated. The laboratory tests include Proctors, moistures, grain-size analysis, hydrometers, Atterburg Limits consolidation, and direct shear.

Construction monitoring services provided by NGA includes:

• Monitoring and Testing of Structural Fill
• Foundation Bearing Capacity Evaluation
• Pile and Pier Installation Monitoring
• Settlement Analysis, Load Testing, and Surcharge Monitoring
• Groundwater Level Monitoring
• Erosion Control Monitoring (CESCL)
• Asphalt Testing

Additional Services

We believe that our extensive experience in the Pacific Northwest provides us with the ability to provide our clients with professional services and products. Our ability to respond to any geotechnical and geologic issues or concerns has been instrumental in creating a good reputation with municipalities, jurisdictions, and designers in the area.

Additional services provided by NGA are:

• Geologic Constraints, Bluff Studies, and Slope Stability Analysis
• Studies for Municipal and Domestic Water Projects
• Coastal Processes - Evaluation and Study
• Off-shore, River, and Geomorpholigical Studies
• Fault Mapping and Seismicity Evaluation
• Coal Mine Hazards and Evaluation
• Aerial Photo Interpretation
• Gravel Source and Quarry Studies
• Earth Science Historical Research and Review
• Peer Review
• Expert Witness and Legal Testimony