Scope of Work:

Metro's proposed facility aims to meet the growing demands of the Portland region by providing a full-service Materials Transfer Center and Household Hazardous Waste Facility. Central Geotechnical Services undertook a multi-faceted investigation to evaluate the site's feasibility. This included a thorough review of historical site documentation and aerial imagery to understand past land use and potential geotechnical challenges. Geotechnical drilling and laboratory testing were conducted to characterize the subsurface conditions, while piezometer monitoring wells were installed to monitor groundwater levels. To further enhance site understanding, advanced geophysical exploration methods such as Refraction Microtremor (ReMi) and Multichannel Analysis of Surface Waves (MASW) were utilized to assess soil properties and seismic response characteristics.

Project Activities:

• Conducted extensive geotechnical drilling and soil sampling to evaluate subsurface conditions.

• Implemented laboratory testing to determine soil properties relevant to development feasibility.

• Installed and monitored piezometer wells to assess groundwater levels and potential impacts.

• Performed geophysical surveys to gather seismic and structural data critical for design considerations.

• Collaborated closely with Metro and project stakeholders to ensure timely and accurate reporting.

Results:

The Preliminary Geotechnical Investigation was completed within the tight timeline required to support Metro's due diligence process. Central Engineerings ability to efficiently analyze complex site conditions and provide actionable insights played a crucial role in the project's early success. The comprehensive data and recommendations delivered by Central facilitated informed decision-making and project cost estimation. As the project progresses, Central looks forward to continued collaboration with Metro in subsequent phases to ensure the development of a safe and efficient waste transfer facility.