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<br />Preliminary Closure and Postclosure Maintenance Plan ii Department of Public Works/Solid Waste <br />North County Recycling Center and Sanitary Landfill County of San Joaquin Public Works/Solid Waste –October 30, 2024 <br /> Contents ______________________________________________________ <br />Acronyms and Abbreviations ........................................................................................................................................ iv <br />1.0 Introduction .................................................................................................................................................... 2-1 <br />1.1 Purpose .............................................................................................................................................. 2-1 <br />1.2 Background ......................................................................................................................................... 2-1 <br />1.3 Regulatory Requirements ................................................................................................................... 2-1 <br />2.0 Preliminary Closure Plan ................................................................................................................................ 2-2 <br />2.1 General ............................................................................................................................................... 2-2 <br />2.1.1 Location and Background ..................................................................................................... 2-2 <br />2.1.2 Site Development ................................................................................................................. 2-2 <br />2.1.3 Surrounding Land Use .......................................................................................................... 2-2 <br />2.1.4 Base Liner and LCRS System .............................................................................................. 2-3 <br />2.2 Maximum Area Requiring Closure ...................................................................................................... 2-3 <br />2.3 Removal of Landfill Structures ............................................................................................................ 2-3 <br />2.4 Decommissioning of Environmental Control Systems ........................................................................ 2-4 <br />2.5 Description of Closure Activities ......................................................................................................... 2-4 <br />2.5.1 Final Cover ........................................................................................................................... 2-4 <br />2.5.2 Final Grading and Drainage Plan ......................................................................................... 2-4 <br />2.5.3 Interim Development ............................................................................................................ 2-5 <br />2.5.4 Erosion Control ..................................................................................................................... 2-6 <br />2.5.5 Stability Analysis................................................................................................................... 2-6 <br />2.5.6 Landfill Gas (LFG) Migration Monitoring ............................................................................... 2-7 <br />2.5.7 LFG Emission Control .......................................................................................................... 2-7 <br />2.5.8 Groundwater, Surface Water, NPDES, and Unsaturated Zone Monitoring .......................... 2-7 <br />2.5.9 Site Security ......................................................................................................................... 2-8 <br />2.5.10 Construction Quality Assurance ........................................................................................... 2-8 <br />2.5.11 Leachate Monitoring and Control ......................................................................................... 2-9 <br />2.6 Site Life and Closure Schedule........................................................................................................... 2-9 <br />2.7 Land Use of Closed Area .................................................................................................................. 2-10 <br />2.8 Preliminary Closure Cost Estimate ................................................................................................... 2-10 <br />3.0 Postclosure Maintenance Plan ....................................................................................................................... 3-1 <br />3.1 Postclosure Land Use ......................................................................................................................... 3-1 <br />3.2 Monitoring and Control Systems ......................................................................................................... 3-1 <br />3.3 Postclosure Maintenance ................................................................................................................... 3-2 <br />3.3.1 Maintenance of the Integrity and Effectiveness of the Final Cover ....................................... 3-2 <br />3.3.2 Inspecting and Maintaining the Drainage System ................................................................ 3-3 <br />3.3.3 Maintaining the Vegetative Cover ......................................................................................... 3-3 <br />3.3.4 Inspecting and Maintaining the Final Grading ...................................................................... 3-4 <br />3.3.5 Settlement ............................................................................................................................ 3-4 <br />3.3.6 Operations and Maintenance for LFG Migration Monitoring and Control System ................ 3-4 <br />3.3.7 Operations and Maintenance for LFG Emission Monitoring and Control System ................. 3-5 <br />3.3.8 Groundwater Monitoring ....................................................................................................... 3-5 <br />3.3.9 Leachate Monitoring and Control ......................................................................................... 3-5 <br />3.4 Postclosure Maintenance Cost Estimates .......................................................................................... 3-5 <br />3.5 Financial Assurance ........................................................................................................................... 3-6 <br />4.0 References ..................................................................................................................................................... 4-1 <br /> <br />