Frank J. Rollo, PE, GE, Principal Engineer

Mr. Rollo performs geotechnical and environmental investigations, litigation consultation, and construction oversight for multi-million dollar projects. His over 20 years of experience includes project management and supervision during investigations for commercial, retail, and residential developments and offshore structures, as well as emergency response for public agencies. Mr. Rollo has managed the seismic upgrades of mid- and low-rise buildings, hospital rebuilds and expansions, and educational facilities, and the reconstruction of structures damaged during natural and maninduced disasters in Central California, including the sewer failure at West Clay Park/Seacliff District, San Francisco rockfalls, the Loma Prieta earthquake, and the Oakland Hills fire. Click here for resume »

Christopher A. Ridley, PE, GE, Principal Engineer

Mr. Ridley has more than 12 years of professional experience in performing and managing geotechnical investigations and construction observation services for various projects throughout the San Francisco Bay Area. His experience includes project management and supervision during investigations for 1) commercial, retail, and residential developments, 2) schools, universities, and museum facilities, and 3) offshore structures including bridges and piers. As a project manager, his experience includes directing subsurface investigations, evaluating foundation systems, performing engineering analyses, and directing field personnel. Mr. Ridley has performed engineering analyses to determine the settlement behavior of soil under loading, bearing capacity for shallow foundations, lateral and vertical pile capacity, slope stability, and seismic hazards including liquefaction potential. Click here for resume »