Jeremiah Jezerski is presenting “Northeast Boundary Tunnel – Mount Olivet Road Drop Shaft” on Friday, October 7th at 9:15 am. The Mount Olivet Road Drop Shaft (MOR-DS) support of excavation (SOE) is a circular unreinforced concrete shaft with an inside diameter of a 30.5 ft and depth of 120.5 ft, constructed using slurry wall methods. The SOE for the adjacent MOR-AC and MOR-VCV near surface structures (NSS) consists of lean mix concrete walls and cement-bentonite walls, respectively, both constructed using slurry wall techniques and reinforced with embedded soldier piles. NSS SOE required multiple levels of preloaded internal bracing, with excavation depths of up to 75 ft. This program will explore the finite element modeling, geotechnical instrumentation, and slurry wall construction of this deep excavation.
Amshu Chappa will join Robert Small from Malcolm Drilling Company to present “The Benefits of an Early Contractor Involvement For A Mega Project In San Francisco” on Thursday, October 6 at 12 noon. This program is about the $2 Billion Biosolids Digester Facilities Project in San Francisco which, once complete, will upgrade and modernize the existing facilities at the Southeast Treatment Plant (SEP), which treats over 80% of the city’s wastewater and also provides drinking water. This upgrade will also reduce odors in the surrounding neighborhoods, improve resiliency for future earthquakes and sea level rise, and provide operational redundancy and efficiency for decades to come. This paper will highlight the benefits of early involvement of a specialty contractor in a very complex project. The interaction with the owner’s design and management team during a pre-construction phase enabled the project team to apply the most modern and efficient construction techniques proposed by the contractor. Significant cost and schedule savings made this a very successful project for all involved parties.