Morro Bay, CA – Wallace Group was retained by the City of Morro Bay to evaluate, make recommendations for upgrade, and design the improvements for two of the City’s three sewage lift stations. Both lift stations were constructed in the 1960s and approaching the end of their useful lives and were wetpit/drypit style lift stations. Although both lift stations had served the City well, maintenance, confined space entry, aging pumps and force mains had been growing concerns in recent years.
Lift Station 2 is a 750 gpm lift station, situated on the waterfront/embarcadero, and subject to California Coastal Commission (CCC) jurisdiction. Wallace Group assisted the City with securing the CCC approval for the project, including developing photo renderings of the modernized lift station. The design included additional safeguards by providing a triplex lift station, which allows a single pump to handle peak flows, a second pump for redundancy, and a third pump that can be taken out of service. Finally, the new piping vault was designed to include an emergency bypass connection to provide City staff with yet another option for operations flexibility.
Lift station 3 was newly configured as part of this modern upgrade, and includes a duplex submersible lift station rated at 330-gpm capacity. Similar to Lift Station 2, this lift station is equipped with a new service building, upgraded ferrous chloride chemical feed facilities, a new 8-foot diameter wetwell, and one mile of new 8” diameter force main to convey raw wastewater uphill to its discharge point in the gravity collection system. For this lift station, the old 6” force main remains in service on standby, while the new 8” force main remains in service day-to-day. Lift Station 3 is located adjacent to Chorro Creek which feeds the Morro Bay estuary, a national bird sanctuary.