OCWD Management Area
watershed stakeholders in determining potential future SAR flows arriving at Prado Dam and the potential impact of future projects on these flows. • A study to examine the use of Forecast Informed Reservoir Operations (FIRO) at Prado Dam. A Preliminary Viability Assessment (PVA) was completed in July 2021, which showed that FIRO is viable at Prado Dam and able to provide an average of up to 7,000 acre-feet of water depending on how much water can be temporarily impounded (Ralph et al., 2021). Work on the Final Viability Assessment (FVA) is underway and scheduled for completion in mid-2023. In parallel to the FVA is work with the US Army Corps of Engineers to test FIRO at Prado Dam (through a minor deviation from the approved Water Control Plan) for a five-year period, starting in fall 2023.
Future anticipated activities and projects:
• Additional treatment systems may need to be constructed on production wells based on water quality results or changes in regulations. • Projects may need to be constructed to improve water quality during recharge, such as sorbents to remove contaminants during recharge. • Projects may needed to facilitate implementation of FIRO at Prado Dam or at Santiago Basins. ▪ Additional groundwater monitoring wells may need to be constructed to fill data gaps, including the Sunset Gap, and other areas in the basin.
▪ Design and construction of a potential seawater barrier at the Sunset Gap.
▪ Implementation of a groundwater contamination remedy in the South Basin area.
BASIN 8-1 ALTERNATIVE 2022 UPDATE
Evaluation of Potential Projects 16-2
Appendix F - 199
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