The project involved the management of a Combined Sewer Overflow (CSO) Basin construction and deconstruction. A massive 104-foot diameter caisson was sunk to a depth of 158 feet to facilitate the construction of the CSO basin in challenging ground conditions or under water. After its use, an approximately 85-foot diameter sinking shaft caisson was removed, which was crucial for subsequent phases of the project or environmental restoration. The area left by the removal of the caisson was filled with pervious material backfill, beneficial for managing drainage and preventing water accumulation post-construction. Comprehensive site restoration was then carried out to return the site to a functional state, potentially for public use, environmental compliance, or future projects. This could have included regrading for proper drainage, planting vegetation for soil stabilization, and installing necessary infrastructure if designated as public space. The choice of pervious backfill and restoration efforts reflect a commitment to environmental stewardship, aiming to mitigate the construction's ecological impact through measures like erosion control and wildlife protection. The removal of such a large caisson presented significant engineering challenges, including the careful dismantling or extraction to prevent damage to the surrounding area or groundwater contamination, highlighting the complexity of urban infrastructure projects focused on water management in densely populated areas.