La Habra-Brea Management Area
Figure 3-9: Coyote Creek Watershed.
A review of available references was conducted to identify any potential presence of Groundwater Dependent Ecosystems (GDEs) in the La Habra-Brea Management Area and to review potential impacts groundwater extraction m ay have on the ecosystems. DWR’s Natural Communities (NC) dataset includes two habitat classes which are associated with groundwater: wetland features and vegetation types. Small areas of GDEs such as Palustrine, scrub-shrub, seasonally flooded wetlands, have been found on the western portion of the La Habra Groundwater Basin. Groundwater dependent vegetation, such as Coast Live Oak, Willow, and Riparian Mixed Hardwood have been found in small areas within the central and eastern portions of the La Habra Groundwater Basin (DWR, 2021b). As shown in Figure 3-10 below, groundwater extraction does not occur near groundwater dependent vegetation or wetlands. Likewise, potential groundwater recharge locations are not located near groundwater dependent vegetation; therefore, any future recharge project would not alter the current natural ecosystem. La Habra’s groundwater production wells extract groundwater from the San Pedro formation, the deepest aquifer unit that forms the La Habra Groundwater basin, which is significantly deeper than the than the perched alluvial (Yerkes, 1972). The areas of vegetation identified as groundwater dependent ecosystems are along the base of the surrounding hills at the limits of the basin and are also supported by surface water runoff and rainfall. Cross sections in the region indicate shallow groundwater in those areas.
2017 BASIN 8-1 ALTERNATIVE
3-13
Appendix F - 30
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