Event Date
Speaker Michael Cox will present his presentation on the Upper San Leandro Water Treatment Plant. The presentation is meant to detail the various aspect of a construction engineer working in a specialized Design Build firm. The presentation will use a case study of a complex design-build shoring system to illustrate the various phases of the “deferred submittal” style of design-build construction, specifically in the earth retention sector. This presentation examines the temporary excavation shoring system designed for the new Chlorine Contact Basin (CCB) at the Upper San Leandro Water Treatment Plant, with a focus on geotechnical behavior, structural response, and constructability in a highly constrained, existing facility. The project required a deep, circular excavation immediately adjacent to an operating CCB, an effluent valve pit, process trenches, and numerous utilities, where even modest ground movements could have significant consequences. The selected system consists of a secant soldier pile wall, three levels of circular ring walers, and an array of radial and pit bracing members, supplemented by wood lagging and controlled low-strength material (CLSM) berms.