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Rare Plant Survey Report Griffith Energy Storage Project 1.0 INTRODUCTION Tetra Tech has prepared this rare plant survey report for the proposed Griffith Energy Storage Project (Project).Griffith Energy, LLC (Griffith Energy) proposes to develop approximately 20 acres of a 132- acre site into a battery energy storage facility.A majority of the Project site is located in San Joaquin County,California and a small western portion of the Project site is located in Alameda County(Figure 1).The Project site of 132 acres was surveyed for rare plants in 2022. Tetra Tech previously conducted a literature search and a general biological survey in January 2022 at the proposed Project site (Tetra Tech 2022). Based on the general biological survey results and the habitats found onsite,an assessment of rare plants that could occur onsite was performed (Tetra Tech 2022).The Biological Resources Evaluation Report recommended conducting rare plant surveys for caper-fruited tropidocarpum (Tropidocarpum capparideum) and big tarplant(Blepharizonia plumosa) based on this assessment(Tetra Tech 2022). Both of these species have a California Rare Plant Rank (CRPR) of 1B.1,which indicates that they are rare,threatened,or endangered in California and elsewhere and are considered seriously threatened in California. One rare plant survey was conducted for caper-fruited tropidocarpum in March 2022 and a second survey was conducted for big tarplant in September 2022.The purpose of this rare plant survey report is to document the methods and results of the rare plant surveys. 1.1 Project Site Location, Ecoregion, and Land Use 1.1.1 Project Site Location The Project site is located along the border of San Joaquin and Alameda Counties in California (Figures 1 and 2). It is generally bound by rolling hills used for wind-energy generation,cattle grazing, and residential housing.The Diablo Mountain Range is between 3 and 5 miles south and west of the Project site.The nearest city is Tracy,California,which is 4.5 miles east of the Project site. Interstate 580 is approximately 1 mile to the northeast and Interstate 205 is approximately 2 miles north of the Project site.The Project site is within Township 2 South, Range 4 East,Section 32 in San Joaquin and Alameda Counties.The Project site is centered at a latitude of 37.710 degrees North and longitude of- 121.554 degrees West(in decimal degrees).The Project site is also in the U.S. Geological Survey Midway 7.5-Minute Topographic Quadrangle Map (Figure 3).The Project property consists of two parcels with the following Assessor's Parcel Numbers:20910019 (San Joaquin County) and 99B-7885-2 (Alameda County). 1.1.2 Ecoregion The Project site is located within the Great Valley Geomorphic Province,which is a broad,flat,alluvial plain about 50 miles wide and 400 miles long in the central part of California between the Sierra Nevada in the east and the Coast Ranges in the west(Jepson Flora Project [eds.] 2021).The Central Valley is composed of two valleys: 1)the northern and smaller valley, known as the Sacramento Valley,which is drained by the Sacramento River;and 2)the southern and larger valley, known as the San Joaquin Valley,which is drained by the San Joaquin River(California Department of OTETRA TECH 1 July 2023