Appendix A Natural Environment Study (Minimal Impacts)

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Natural Environment Study (Minimal Impacts) capacity/waters of the U.S. would occur under the Project. During construction, temporary fill would be placed within the Santa Ana River channel associated with a potential bike detour route, materials staging and access, and/or dewatering. Such temporary fills would not permanently reduce channel capacity or result in the loss of aquatic resources. Since work would be occurring within nonwetland jurisdictional aquatic resources associated with the Santa Ana River, resource agency permits (USACE Section 404 Nationwide Permit authorization, CDFW Section 1602 Streambed Alteration Agreement, and RWQCB Section 401 Water Quality Certification) are anticipated to be required for the Project. In addition, the Santa Ana River is a USACE facility under Section 14 ("Section 408") of the Rivers and Harbors Act of 1899, so Section 408 permission will also be required for the Project. 5.5. Nesting Birds The BSA contains mature ornamental trees and other areas, including the culverts where inactive cliff swallow nests were found, which could provide nesting habitat for native birds. To avoid potential impacts to nesting birds that are protected under the California Fish and Game Code and the MBTA, it is recommended that any necessary vegetation removal be performed outside the bird nesting season (February 1—September 30). If vegetation removal cannot be performed outside the bird nesting season or if construction is scheduled to begin during the nesting season, Measure BI0-2 (refer to Section 4.1.4.3.) will be implemented to avoid adverse impacts to nesting birds. 5.6. Invasive Species A majority of the plants observed (Appendix B) within the BSA are classified as Invasive Species and listed on the California Invasive Plant Council (Cal-IPC) Inventory Database. Measure BIO-1 (refer to Section 4.1.1.3) contains provisions that will be implemented to prevent the spread of exotic plant species. With implementation of Measure BIO-1, the Project is not expected to disperse exotic plant species seeds or otherwise contribute to the invasion of exotic species into natural habitats. 6. References Baldwin, B.G., D.H. Goldman, D.J. Keil, R. Patterson, T.J. Rosatti, and D.H. Wilken, editors. 2012. The Jepson Manual: Vascular Plants of California, Second Edition. University of California Press, Berkeley. ................................................................................................................................................ . 46 Fairview Street Improvements from 9th Street to 16th Street and Bridge Replacement Project