FINAL CLOSURE AND 

POST-CLOSURE MAINTENANCE PLAN 

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PICACHO CUT AND FILL SITE 

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ACRONYM LIST 

1.0 INTRODUCTION 1-1 

 1.1 Purpose 1-1 

 1.2 Site Location 1-2 

 1.3 Closure Date 1-3 

 1.4 Surrounding Land Use 1-3 

 1.5 Post-Closure Site Use 1-4 

2.0 EXISTING ENVIRONMENTAL CONTROL AND 

 MONITORING SYSTEMS 2-1 

 2.1 Landfill Gas Control/Monitoring System 2-1 

 2.2 Groundwater Monitoring System 2-1 

 2.3 Leachate Collection and Removal System/Monitoring 2-3 

 2.4 Stormwater Monitoring 2-3 

3.0 CLOSURE PLAN 3-1 

 3.1 Introduction 3-1 

 3.2 Final Grading 3-3 

 3.3 Final Cover 3-2 

 3.3.1 Minimum Design Standards 3-2 

 3.3.2 Final Cover Design 3-3 

 3.3.3 Final Cover Construction 3-4 

 3.3.3.1 Access Road 3-6 

 3.4 Landfill Settlement 3-6 

 3.4.1 Settlement Analysis 3-6 

 3.4.1.1 Settlement Due to Underlying Native Material 

 Subsidence 3-7 

 3.5 Closed Landfill Stability 3-7 
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 3.6 Construction Quality Assurance 3-10 

 3.7 Drainage and Erosion Control 3-11 

 3.7.1 Drainage Design 3-11 

 3.7.1.1 Surface Water Hydrology 3-11 

 3.7.1.2 Existing Drainage System 3-11 

 3.7.1.3 Proposed Final Drainage Control System 3-12 

 3.7.2 Soil Loss Analysis 3-12 

 3.7.3 Erosion Control 3-13 

 3.8 Landfill Gas Control/Migration Monitoring System 3-14 

 3.9 Groundwater Monitoring System 3-15 

 3.10 Leachate Collection and Removal System 3-15 

 3.11 Site Security 3-16 

 3.12 Structure Removal/Decommissioning of Environmental 

 Control Systems 3-16 

 3.13 Closure Implementation Schedule 3-17 

 3.13.1 Closure Process 3-17 

 3.13.2 Construction Management 3-18 

4.0 POST-CLOSURE MAINTENANCE PLAN 4-1 

4.1 Introduction 4-1 

 4.2 Responsible Parties 4-1 

 4.3 Landfill Gas Migration Monitoring and Maintenance 4-2 

 4.3.1 Landfill Gas Migration Monitoring Procedures 4-2 

 4.3.2 Landfill Gas Migration Monitoring Reporting 4-3 

4.3.3 Maintenance of Landfill Gas Migration 

Monitoring System 4-3 

 4.4 Groundwater, Leachate and Surface Water Monitoring 4-4 

 4.4.1 Groundwater Monitoring Procedures 4-5 
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 4.4.2 Groundwater Monitoring Evaluation and Reporting 4-6 

 4.4.3 Groundwater Monitoring Systems Maintenance 4-10 

 4.5 Final Cover Inspection and Maintenance 4-11 

 4.5.1 Periodic Leak Search/Identification of Problem Areas 4-12 

 4.5.2 Maintenance Procedures 4-12 

 4.6 Landfill Settlement Monitoring 4-14 

 4.7 Access Road Maintenance 4-14 

 4.8 Drainage System Inspection and Maintenance 4-14 

 4.8.1 Deck Drainage Control System Features Maintenance 4-14 

 4.8.2 Downdrains, Drainage Channels, Basins and Ditches 4-15 

 4.8.3 Overall Drainage Maintenance Schedule 4-15 

 4.9 Site Security Inspection and Maintenance 4-16 

 4.10 Equipment, Labor and Material Requirements 4-16 

 4.10.1 Equipment 4-16 

 4.10.2 Labor 4-16 

5.0 POST-CLOSURE EMERGENCY RESPONSE PLAN 5-1

 5.1 Purpose and Scope 5-1 

 5.2 Site Safety Officer 5-1 

 5.3 Emergency Response Notification Procedure 5-1 

 5.4 Emergency Response Procedures 5-2 

 5.5 Fire and/or Explosions 5-3 

 5.6 Flood 5-3 

 5.7 Earthquake 5-4 

 5.8 Surface Drainage Problems 5-4 

 5.9 Vandalism 5-5 

 5.10 Underground Fires 5-5 

 5.11 Emergency Response Plan Orientation 5-5 

 5.12 Evacuation Procedures 5-6 

 5.13 Medical Care Procedures 5-6 

 5.14 Amendments to the Emergency Response Plan 5-6 
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6.0 CLOSURE/POST-CLOSURE MAINTENANCE COST ESTIMATE 6-1

 6.1 Introduction 6-1 

 6.2 Closure Cost Estimate 6-1 

 6.2.1 Final Cover 6-1 

 6.2.2 Final Cover Construction Quality Assurance 6-2 

 6.2.3 Drainage Control System 6-2 

 6.2.4 Erosion Control 6-2 

 6.2.5 Gas Migration Monitoring System 6-2 

 6.2.6 Groundwater Monitoring System 6-2 

 6.2.7 Site Security 6-2 

 6.2.8 Demolition 6-2 

 6.2.9 Closure Certification Report 6-3 

 6.2.10 Engineering Design Plans and Specifications 6-3 

 6.2.11 Construction Management 6-3 

 6.3 Post-Closure Maintenance Cost Estimate 6-3 

 6.4 Demonstration of Financial Responsibility 6-3 

7.0 RECORDKEEPING 7-1 

 7.1 Operating Record 7-1 

 7.2 Location and Inspection of Operating Records 7-1 

8.0 REFERENCES 

 8-1 

9.0 ENVIRONMENTAL PROTECTION AGENCY COMMENTS ON FINAL 

CLOSURE/POST CLOSURE MAINTENANCE PLAN DATED 2/10/2011 – 

ADDENDUM TO THE CLOSURE PLAN 
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LIST OF TABLES

Table 1 Site Life Projection 

Table 2 Final Closure Vegetative Cover Seed Mix 

Table 3 Closure Implementation Schedule 

Table 4 Post-Closure Maintenance Schedule 

Table 5 Post-Closure Equipment Schedule 

Table 6 Post-Closure Monitoring Schedule 

Table 7 Closure Cost Estimate Summary 

Table 8 Annual Post-Closure Maintenance and Monitoring Cost Estimate 

Summary 

LIST OF FIGURES

Figure 1 Location/Vicinity Map 

Figure 2 Site Plan 

Figure 3 Pre-Landfill Topography 

Figure 4 Fault Map 

Figure 5 Final Grading and Drainage Plan 

Figure 5A Final Grading and Drainage Plan with Benchmark 

Figure 6 Detail Sheet 

Figure 7 Cross Sections 

Figure 8 100-Year Developed Condition Hydrology Map 

Figure 9 Sign 

LIST OF FULL-SIZE DRAWINGS

Drawing 1 Site Plan 

Drawing 2 Final Grading and Drainage Plan 

Drawing 2A Cross Sections 

Drawing 3 Detail Sheet 

Drawing 4 100-Year Developed Condition Hydrology Map 

LIST OF APPENDICES

Appendix A Landfill Capacity Calculation Worksheet 

Appendix B Well Construction Logs 

Appendix C Sampling and Analysis Plan 

Appendix C-1 Site-Specific Flexibility Request – Modified List of Detection 

 Monitoring Parameters 
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Appendix D Preliminary Evaluation for an Alternative Final Cover Design 

Appendix D-1 Site-Specific Flexibility Request – Alternative Final Cover 

Appendix E Hydrology Study Calculations 

Appendix F Soil Loss Analysis 

Appendix G Post-Closure Maintenance/Monitoring Forms 

Appendix H Methane Gas Detection Monitoring Results 

Appendix I Landfill Cover Stability Results 

Appendix J Landfill Gas Migration Monitoring Probe Plan (Proposed)