PCL converted the existing Riverside Regional Water Quality Control Plant facility to a 26-million-gallons-per-day (MGD) membrane bioreactor facility.
The nearly 80-year-old facility required PCL to navigate through the plant’s original utilities and pre-existing as-built drawings of the plant. Because the plant is a “dead end” plant, water cannot be diverted to another facility from this plant. This constraint required extensive planning, scheduling, and bypass work as new facilities were brought online while maintaining 100 percent capacity of the existing plant. The team used 3-D scanning to model existing piping and provided a model around which to build the new facilities. The project team was able to work around, and in some instances, tie-in to existing lines without disrupting operations at the plant.
The project scope included converting secondary clarifiers to a Membrane Bioreactor (MBR) basin, and construction of a new storm water equalization basin, clarifiers, and ancillary facilities. The project team also retrofitted the plant’s existing activated train, repaired and replaced existing clarifier mechanisms, and upgraded the plant’s electrical generators. Additionally, the solids handling facilities were upgraded to include two new digesters and gas flares.