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Rare Plant Survey Report Griffith Energy Storage Project 3.0 SURVEY METHODS A literature review was conducted that included the California Department of Fish and Wildlife California Natural Diversity Database (CNDDB) RareFind 5 online database and the California Native Plant Society online Inventory of Rare and Endangered Plants of California (CDFW 2022). Based on the literature review and general biological survey results,two rare plants were determined to have potential to occur on the Project site: big tarplant and caper-fruited tropidocarpum (CDFW 2022;Tetra Tech 2022). Previous CNDDB records of big tarplant and caper-fruited tropidocarpum are located outside the Project site; big tarplant was previously found approximately 25 feet to the west of the Project site in 2003 and caper-fruited tropidocarpum was found approximately 120 feet to the northwest of the Project site in 1987(CDFW 2022,CNPS 2021). Caper-fruited tropidocarpum blooms from March to April and big tarplant blooms from July to November.Therefore,two rare plant surveys were conducted on the Project site to capture the blooming periods of the rare plant species with the potential to occur onsite.The first rare plant survey for caper-fruited tropidocarpum was conducted in March 2022.The second rare plant survey for big tarplant was conducted in September 2022.Two biologists surveyed the entire Project site during each survey by walking meandering transects throughout the Project site.Transects were spaced 30 meters apart to ensure 100 percent visual coverage of the Project site.All plant species found onsite were identified and recorded.The surveys were conducted during daylight hours and clear conditions at temperatures of approximately 60-80 degrees Fahrenheit.Any rare plant populations found onsite were mapped using a sub-meter accuracy Global Positioning System unit and individuals were counted. Photographs that were taken during the surveys are provided in Appendix A. OTETRA TECH 7 July 2023