Ocean Outfall Rehabilitation

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Outfall Low Flow Pump Station and SCADA System and Network Upgrades

Project Description:
This project has two components, the first will rehabilitate the mechanical, electrical, and civil systems at the Ocean Outfall Booster Station at Plant No. 2 which is the primary pumping station for the discharge of secondary effluent to the ocean outfall system. It includes replacement of portions of the Ocean Outfall Booster Station pumping systems by constructing a new low flow pump station to more efficiently pump dry weather flow. In addition, will construct a new plant water pump station to accommodate the Groundwater Replenishment System Final Expansion (read more below).

The second component consists of providing a Process Data Network at Plant No. 2 which is independent and isolated from the Office Data and Security systems. These improvements will provide greater security, increase SCADA system capacity, and provide the network needed for the Load Management and Load Shedding System. Load Management and Load Shedding items will be provided under this project.

Above:  Examples of electrical equipment that will be upgraded and replaced as part of the project. 

Project Status:

Cement-mixed columns extending 45 feet deep below the ground surface are being installed using a method called deep soil mixing which will strengthen the ground capacity.  After deep soil mixing is completed, a new low flow pump station and a new plant water pump station will be constructed.

Deep Soil Mixing Rig by Scrubbers

Schedule:

Construction commenced April 2019 and will last approximately 5 years 

Current Approved Budget: $138,890,000

Construction Budget: $90,200,000

Groundwater Replenishment System Final Expansion:

GWRS Water GlassThe Groundwater Replenishment System is a collaboration between OCSD and the Orange County Water District to provide a reclaimable and sustainable water supply for Orange County.  The Groundwater Replenishment System Final Expansion (GWRSFE) will maximize water reuse, reducing the amount of treated wastewater discharged through the ocean outfall.  

How does this project tie into the GWRSFE?  Reduced treated wastewater flows discharged through the ocean outfall will have effects on the current pumps and piping of the Ocean Outfall System that were built to handle higher flows.  Construction of a new low flow pump station is required to handle the reduced daily flows through the outfall.

Another key aspect of the GWRSFE requires Plant No. 2 flows to be separated into reclaimable and non-reclaimable treatment.  A new plant water pump station will be constructed to support this change.