Executive Summary
Canyon Management Area that cause a significant volume of groundwater to become unusable for its designated beneficial uses. 4. Seawater Intrusion: This does not apply to the Santa Ana Canyon Management Area because this area if far removed from the coastline. 5. Subsidence: No vertical changes have been noted using DWR-supplied InSAR data. It is unlikely that this will occur in the Santa Ana Canyon Management Area due to: a. The presence of shale and sandstone bedrock underlying the alluvial aquifer. b. The alluvial aquifer is thin, generally less than 100 feet, and comprised mainly of sand and gravel with little clay. c. Groundwater levels and groundwater storage are stable. d. Very low risk of substantial groundwater level declines due to a de minimis amount of groundwater production relative to the overall inflow of water to the Santa Ana Canyon Management Area. 6. Groundwater Depletions Impacting Surface Water: Due to hydrogeologic conditions and land use limitations, groundwater production in the Santa Ana Canyon Management area has had and is projected to have a de minimis effect on groundwater conditions and flows of surface water through the canyon. Therefore, this factor does not apply to the Santa Ana Canyon Management Area.
BASIN 8-1 ALTERNATIVE 2022 UPDATE
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Appendix F - 247
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