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Executive Summary Level of Potential Impacts Significance Mitigation Measures enhancement/conservation easement on a protected property could be used as mitigation. Compensatory mitigation may be combined with other special-status plant and animal species. If the Project owner chooses to establish an on-site or off- site conservation easement as compensatory mitigation, it must be managed in perpetuity to provide suitable habitat for the target species and to prohibit development/disturbance.A qualified biologist shall prepare a Habitat Mitigation and Monitoring Plan to ensure success of the compensatory mitigation site,which shall describe the long-term management plan, routine monitoring methods, and success criteria.The implementing agency shall approve the Plan prior to implementation. California Red-legged Frog This species is covered under the SJMSCP.The following measure would be implemented in accordance with the SJMSCP(see Section 5.2.4.7)and as best management practices to mitigate impacts: A qualified biologist shall conduct preconstruction surveys for CRLF within 48 hours prior to the start of construction activities, including ground disturbance,vegetation clearing, and staging of equipment.The biologist shall survey the Project site and all suitable habitat within 300 feet of the Project site. If CRLF are identified during the preconstruction survey, a 300-foot no-disturbance setback would be established in accordance with the SJMSCP to protect the species. No construction or other ground disturbances would be allowed within the setback unless concurrence was obtained by USFWS and SJCOG.The setback distance may be reduced by a qualified biologist with concurrence from the implementing agency if determined to not result in an adverse impact to the species or a reduction in the biological values of the habitat. Setbacks would be delineated with brightly colored flagging during the construction process and shown on maps that would be provided to on-site staff. If impacts are required within a setback occupied by CRLF and the species cannot or does not move off-site on its own, consultation with the USFWS and CDFW would be required to determine the appropriate course of action.The results of the preconstruction surveys shall be submitted to the implementing agency prior to start of construction. Water quality within water bodies inhabited by CRLF shall be maintained by implementing appropriate erosion control measures to reduce siltation and contaminated runoff from Project site(e.g., maintaining vegetation within buffers, and/or through the use of hay bales,filter fences,vegetative buffer strips,or other acceptable options per Section 5.2.4.7 of the SJMSCP). Griffith Energy Storage Project ES-10 Tetra Tech/SCH2022120675 Draft Environmental Impact Report August 2023