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County of Riverside 11 The gas monitoring system inspection and maintenance program will be the responsibility of the County for the duration of the maintenance period, or until an operating exemption is granted by the CalRecycle and the LEA as allowed per 27 CCR 20921 (d). 9.5 EMERGENCY RESPONSE 9.5.1 Earthquakes The West Riverside Landfill is located in an area of moderate to strong seismic activity. Ground motion resulting from faults in the region is expected to be moderate to strong. The landfill final grades and cover system have been designed based on a seismic slope stability analysis specific to site conditions and anticipated ground motion. Final cover system and solar equipment are expected to be stable under anticipated seismic conditions. The solar arrays will be visually inspected within 12 hours after a moderate or strong earthquake event. The inspection will assess the condition of final cover on the side slopes, benches and top deck; and drainage structures. Areas where the cover layer appears compromised, or refuse has day-lighted, will be identified. Necessary landfill repairs will be prioritized in accordance with other earthquake response needs at the landfill. Corrective landfill repairs will generally be made as described in Section 9.2 of this Maintenance Plan. If necessary, a remediation plan and/or corrective action construction plans and specifications will be prepared. Materials and application methodologies shall be subject to County and regulatory agency approval prior to implementation. 9.5.2 Floods The closed landfill cells lie at an elevation that is not within the 100-year flood plain as depicted in the Federal Emergency Management Agency flood insurance map for the region. No flood hazard is anticipated. 9.5.3 Geotechnical and Seismic The areas where the solar arrays are located are flat with minimum slopes. The solar project structures have been designed to withstand the anticipated seismic events at the site. A geotechnical report prepared for the solar project (GPI, 2014) is presented in Appendix C. A detailed cover and global seismic analysis is contained in the 1993 Closure and Post-Closure Maintenance Plan (The Earth Technology Corporation, 1993). 9.5.4 Surface Drainage Problems The existing surface water drainage system will handle runoff from the site with only minor instances of erosion expected. The system has been designed for 100-year rainfall event, which will provide adequate protection for the landfill. Routine monthly inspections and corrective landfill repairs will be made as described in Section 9.3 of this Maintenance Program. Drainage structure improvements and/or repairs will be implemented annually prior to the start of the rainy