San Clemente Main Sewer Pump Station Upgrade

San Clemente, CA


PACE was retained by the City of San Clemente to evaluate a previously completed Preliminary Design Report, make recommendations, and perform final engineering design and services during construction for the Main Pump Station (MPS), which is responsible for pumping 60-70% of the City’s total sewer flow with a 24-million-gallon-per-day (MGD) capacity. The MPS is located directly across the street from North Beach and subject to harsh ocean conditions. Renovation design addressed frequent clogging of the pumps and improved pump station reliability and efficiency. Based on the evaluation, recommendations included structural resurfacing, replacing pumps with smaller, more energy-efficient and clog-resistant pumps, significant electrical equipment upgrades to improve system reliability and provide greater operational flexibility on a smaller footprint within the pump station, replacing the emergency generator, and improving station ventilation conditions for safety and protection of the equipment.


Using specific energy as one of the main pump selection parameters, the recommended alternative was to replace one of the three large pumps with a smaller unit capable of handling the low, average, and diurnal dry-weather flows (up to 2,200 gallons per minute) to the station. The two other pumps remain unchanged to provide for high peak flow conditions and maintain adequate redundancy in the system. Station ventilation improvements included evaluation and modification design for cooling and dehumidification needs for the pump station environment, as well as designing a complex custom intake / exhaust system capable of scouring all the dry areas of the pump station and allowing the station’s ambient environment to be considered unclassified under National Fire Protection Association (NFPA) 820 design requirements.


Key Features:

  • Existing facility evaluation and equipment replacement
  • Upgrades constructed while pump station remained in operation
  • Structural resurfacing
  • Underground pump vault
  • Energy efficiency improvements
  • Emergency generator replacement
  • Electrical equipment upgrades
  • Ventilation improvements
  • Supervisory Control and Data Acquisition (SCADA) / controls integration
  • California Environmental Quality Act (CEQA) documentation and South Coast Air Quality Management District (SCAQMD) permitting
  • Pump station design
  • Coastal Commission coordination

City of San Clemente

Wastewater Infrastructure