Jeff Braun, PE, PMP (Irvine)
Jeff joined ENGEO in 2015 and is a Project Management Professional and Professional Engineer with 22 years of experience in the engineering industry. During his time as an Engineer Officer in the U.S. Army, he provided master planning, design, construction management, and inspection services on projects in several countries with international clients and contractors. As an Associate with ENGEO, he has provided geotechnical design, review, and project management services for projects throughout California.
Kevin McFadden, PE (San Diego)
Kevin joined ENGEO in 2019 after graduating from the University of California, Berkeley where he completed a Master of Science in Geosystems Engineering. He has performed as a Project Engineer assisting with projects ranging from large residential developments to ground improvement projects. His experience includes field observations for complex projects located throughout the Bay Area. Prior to joining ENGEO, Kevin served as a Construction Engineer in the United States Army for four years where he oversaw a multidisciplinary team of engineers in unique construction operations.
Manasa Vijayakumar, PE, QSD (Irvine)
Manasa joined ENGEO after graduating from University of California, San Diego in 2015. She performs field exploration, geotechnical analysis, prepares technical reports, and provides construction observations and consultation. Her experience includes conducting geothermal heat exchange feasibility studies, preparing Stormwater Pollution Prevention Plans (SWPPP) and Water Quality Management Plans, and project management. Manasa serves various types of projects in Orange County and Los Angeles County including master-planned, residential and commercial developments, military-base reuse, parks and recreation facilities, transportation and infrastructure improvements.
Christopher Stouffer, PE (Oakland)
Christopher rejoined ENGEO full time in 2018 following completion of a master’s program at UC Berkeley. He assists in both design and construction services for projects in the public and private sector. In design, he assists in defining subsurface characteristics, identifying geologic hazards, and providing foundation and/or ground improvement recommendations. In construction services, he assists in developing and implementing QA/QC programs, developing construction monitoring programs, and providing on-site consultation. His projects are in both the public and private sector and include large planned developments, shoreline reclamation, residential mid-rise structures, and schools.
The presentation addresses mitigation concepts for the geotechnical challenges that face the proposed redevelopment of Treasure Island. The island is manmade, created in 1936-1937 for the World’s Fair. It was constructed by placing approximately 30-million cubic yards of dredged sand fill over a sand shoal. After the World’s Fair in 1940, the Navy assumed control of the island through an exchange with the City of SF for Mills field in Millbrae. During WWII, Treasure Island became an active naval base until it was decommissioned in 1997. This island is one of the premier pieces of real estate in the world. The City of San Francisco has promoted a self-sustaining community, comprising approximately 8,000 homes (30% affordable) in mid-rise and high-rise towers, retail, historic structures, hotel, boat slips, and restaurants, 300 acres of open space, organic farming, tidal marshes, parkland, a wind farm and a ferry terminal. A goal of the proposed design is to be automobile independent.
The island faces significant geotechnical challenges that influence redevelopment. These include (1) the potential for liquefaction and settlement of the fill and shoal sands; (2) the potential for consolidation of settlements of the underlying bay mud; and (3) the seismic stability of the perimeter of the island and of the causeway. The mitigation scheme includes ground improvement techniques such as: (i) cement deep-soil mixing for shoreline stability (ii) vibro-compaction, vibro-replacement, deep dynamic compaction, and direct power compaction for mitigation of liquefaction and lateral spreading, (iii) surcharging, and shear strength improvement for mitigation of potential deep-seated instability within the bay mud, (iv) surcharging coupled with installation of prefabricated vertical drains for mitigation of young bay mud consolidation settlements.