Terraphase led the planning, design, and field implementation of a pilot-scale sludge-soil-cement stabilization project at the City of San Leandro, California, wastewater treatment plant. The project focused on stabilizing over 30,000 cubic yards of sludge stored in a former polishing pond to create a structurally sound surface for the future construction of a treatment wetland.
Scope of Services
Terraphase conducted bench-scale testing of multiple sludge-soil-cement mixes to identify viable stabilization formulations. Terraphase also designed and implemented a pilot-scale test, which included developing test mix designs and shallow soil mixing methodologies, prequalifying specialty contractors to implement the test, preparing bid documents, and providing construction oversight and quality assurance during implementation test implementation.
Data from the pilot test allowed the project to refine the cement mix design and construction quality assurance requirements, estimate full-scale production rates, evaluate and recommend methodology, and develop the full-scale implementation schedule.
Notable Accomplishments
- Designed and executed successful bench- and pilot-scale testing
- Developed refined mix designs and implementation methodologies based on pilot data
- Delivered construction drawings and technical specifications for full-scale implementation
- Supporting the city with bid document preparation for full-scale rollout
