Scope of Work:

Central Engineering Services was engaged by Portland Community College to provide geotechnical engineering services for the seismic retrofit of the Health and Technology Building at the Sylvania Campus. The project required extensive exploration and analysis to support the construction of new buildings, roadways, and parking facilities while addressing complex geological challenges within USGS Seismic Zone 3. Central conducted multiple phases of geotechnical work, including subsurface investigations, seismic analyses, and construction oversight to ensure adherence to enhanced design standards for critical structures.

Project Activities:

• Conducted subsurface exploration using Ground Penetrating Radar, ultrasonic scanning, conventional and sonic drilling, rock coring, test pits, hand augers, and Dynamic Cone Penetrometer testing.

• Performed laboratory testing on soil and rock samples in-house and through subcontracted laboratories.

• Developed site-specific seismic response studies in accordance with ASCE 7-16 and ASCE 41.

• Created comprehensive as-built drawings combining historical data and new findings to guide construction efforts.

• Provided geotechnical consultation during micropile installation, including load testing and site observations.

• Managed site access and project logistics to minimize disruption to campus operations.

Results:

Central successfully delivered a comprehensive geotechnical report that guided the seismic retrofit design and construction processes. The project demonstrated Central's ability to manage complex seismic challenges and maintain close coordination with the client over a four-year period. The team's expertise contributed to meeting all project milestones within budget, ensuring a safe and resilient final structure. Central's collaboration with design teams resulted in optimized foundation solutions and effective integration of geotechnical recommendations throughout the project's lifecycle.