Appendix A Natural Environment Study (Minimal Impacts)

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Natural Environment Study (Minimal Impacts) Day- and night -roosting habitats for several special -status bat species are present within the Fairview Street bridge over the Santa Ana River. Although no bats were observed day roosting within the structure during the daytime habitat assessment, roosting activity was confirmed by the presence of guano beneath the hinge crevices. Because the bat habitat suitability assessment was performed outside of the bat maternity season, and given the suitability of the crevice habitat observed at this structure for maternity roosting, a follow-up nighttime survey will need to be performed at this location during the summer months (i.e., June —August) in order to confirm whether this structure serves as a maternity roost and to determine the numbers and species of any bats roosting there. No additional studies are required for the Project. 4. Results: Biological Resources, Discussion of Impacts and Mitigation 4.1. Habitats and Natural Communities of Special Concern Habitats are considered to be of special concern based on: (1) federal, State, and/or local laws regulating their development; (2) limited distributions; and/or (3) the habitat requirements of special -status plants or animals. There are no habitats or natural communities of concern within or immediately adjacent to the BSA. The BSA is composed entirely of developed areas, with some ornamental and weedy vegetation. The BSA has low biological value to native plant and wildlife species. 4.1.1. Discussion of Jurisdictional Waters Section 404 of the CWA and Section 1602 of the California Fish and Game Code regulate activities affecting resources under the jurisdiction of the USACE and the CDFW, respectively. "Waters of the U.S." under the jurisdiction of the USACE include navigable coastal and inland waters, lakes, rivers, and streams and their tributaries; interstate waters and their tributaries; wetlands adjacent to such waters; intermittent streams; and other waters that could affect interstate commerce. The BSA contains one jurisdictional drainage feature (the Santa Ana River), as discussed in further detail in the corresponding Jurisdictional Delineation Report (Appendix D). ................................................................................................................................................ . 32 Fairview Street Improvements from 9th Street to 16th Street and Bridge Replacement Project