Item 27 - Water Supply Assessment for Cabrillo Town Center Project

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Santa Ana 2020 Urban Water Management Plan arcadis.com 6-33 Summary of Future Water Projects The City continually reviews practices that will provide its customers with adequate and reliable supplies. Trained staff continue to ensure the water quality is safe and the water supply will meet present and future needs in an environmentally and economically responsible manner. Although the City has various projects planned to maintain and improve the water system (Section 6.9.1), there are currently no City-specific planned projects that have both a concrete timeline and a quantifiable increase in supply. 6.9.1 City Initiatives The City anticipates water demand in the City to remain relatively constant over the next 25 years. Any new water sources developed will primarily be to better manage the groundwater basin and replace or upgrade inefficient wells, rather than support population growth and new development. The projects that have been identified by the City to improve the City’s water supply reliability and enhance the operations of the City include major well rehabilitation and refurbishment, well casing rehabilitation, minor motor control center refurbishment, pump station rehabilitation, water main replacements, MET connection upgrades, emergency power projects, and miscellaneous improvements such as SCADA improvements. A Capital Improvement Program identified water projects to implement between FY 2017-18 through FY 2039-40. Those related to increasing the water supply are listed below – for a more detailed list of projects, refer to the City’s 2017 Water Master Plan (TetraTech, 2017). New Well Construction – The City has identified projects to build New Wells No. 1 and 2, as well as drill new wells for Wells No. 16, 22, and 24. These new wells will provide the City with further redundancy and allow the City to continue achieving pumping capacity for higher BPP rates. Major Well Rehabilitation – The City has identified projects for major well rehabilitation for Wells 29 and 32. 6.9.2 Regional Initiatives Beyond City-specific projects, the City consistently coordinates its long-term water shortage planning with MET and OCWD. MWDOC has identified the following future regional projects, some of which can indirectly benefit the City to further increase local supplies and offset imported supplies (CDM Smith, 2019): Poseidon Huntington Beach Ocean Desalination Project – Poseidon proposes to construct and operate the Huntington Beach Ocean Desalination Plant on a 12-acre parcel adjacent to the AES Huntington Beach Generating Station. The facility would have a capacity of 50 MGD and 56,000 AFY, with its main components consisting of a water intake system, a desalination facility, a concentrate disposal system, and a product water storage tank. This project would provide both system and supply reliability benefits to the SOC, the OC Basin, and Huntington Beach. The capital cost in the initial year for the plant is $1.22 billion. Doheny Ocean Desalination Project – SCWD is proposing to construct an ocean water desalination facility in Dana Point at Doheny State Beach. The facility would have an initial up to 5 MGD capacity, with the potential for future expansions up to 15 MGD. The project’s main components are a subsurface water