Biosolids is San Francisco’s largest wastewater facility which treats most of the city’s stormwater and sewage. This project was an effort to replace the outdated solids treatment plant. Silverado was contracted for the earthwork portion of this package. Our scope was drilling foundation shoring spoils management, hauling, and disposal; Along with management of mass excavation, hauling, and disposal of general excavation of 60,000 cy of non-hazardous and hazardous soils.