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Non-Water Release Corrective Action Plan North County Recycling Center and Sanitary Landfill AU24.1294.00 | Non-Water Release Corrective Action Plan Update i October 2024 TABLE OF CONTENTS 1.0 INTRODUCTION .......................................................................................................... 1 1.1 Background ............................................................................................................. 1 2.0 GEOLOGIC AND HYDROGEOLOGIC OVERVIEW ............................................................ 1 2.1 Site Geology and Hydrogeology .............................................................................. 1 2.2 Surface Water Hydrology ........................................................................................ 2 3.0 LANDFILL CONFIGURATION ........................................................................................ 3 3.1 Landfill Gas Migration Monitoring and Control System ......................................... 3 3.2 Groundwater Monitoring System ........................................................................... 3 3.3 Surface Water Controls ........................................................................................... 3 4.0 REASONABLY FORESEEABLE NON-WATER IMPACTS .................................................... 3 4.1 Seismically-Induced Impacts ................................................................................... 4 4.1.1 Impacts from Ground Rupture .................................................................... 6 4.1.2 Impacts from Seiches .................................................................................. 6 4.1.3 Impacts from Tsunamis ............................................................................... 6 4.1.4 Impacts from Liquefaction and Associated Dynamic Settlement............... 6 4.1.5 Impacts from Potential Slope Failure ......................................................... 7 4.1.6 Summary of Impacts from Seismic Hazards ............................................. 10 4.2 Precipitation Impacts ............................................................................................ 10 4.3 Fire Impacts ........................................................................................................... 11 4.3.1 Subsurface Fires ........................................................................................ 11 4.3.2 Wildfires .................................................................................................... 12 4.4 Flooding Impacts ................................................................................................... 12 4.5 Non-Seismic Long-Term Performance .................................................................. 13 4.5.1 Final Cover System .................................................................................... 13 5.0 ANTICIPATED METHODS OF MITIGATION .................................................................. 14 5.1 Mitigation of Seismically-Induced Impacts ........................................................... 14 5.3 Mitigation of Fire-Related Impacts ....................................................................... 14 5.3.1 Subsurface Fires ........................................................................................ 14 5.3.2 Wildfires .................................................................................................... 15 5.4 Mitigation of Flood-Related Impacts .................................................................... 15 6.0 ESTIMATED NON-WATER RELEASE MITIGATION COST ESTIMATE SUMMARY ............. 15 7.0 LIMITATIONS ............................................................................................................ 15 8.0 REFERENCES ............................................................................................................. 16