La Salina Wastewater Treatment Plant Primary and Secondary Digesters Cleaning and Piping Improvements

Butier Engineering, Inc. provided construction management and inspection services for this project. The purpose of the project was to clean the digesters and replace defective piping and valves to keep the digesters operational until the City decommissions the La Salina Wastewater Treatment plant in approximately 10 years. After decommissioning, all wastewater flows will be diverted to the San Luis Rey Water Reclamation Facility.

Scope of Work

• Dewatering and cleaning primary and secondary digester tanks
• Replacement of heated sludge supply and return piping and valves, including installation of new pipe supports
• Replacement of digester gas piping, valves, and gas protection equipment
• Replacement of the primary digester roof center ring cover, secondary digester seal rings, diaphragm on roof hatches, and sample ports
• Replacement of the digester overflow piping