### FINAL CLOSURE AND
POST-CLOSURE MAINTENANCE PLAN

FOR THE
PICACHO CUT AND FILL SITE

TABLE OF CONTENTS

SECTION PAGE

PCFS FCPCMP i BRYAN A. STIRRAT & ASSOCIATES C:\Documents And Settings\Pwcomputerroom\My Documents\ Solid Waste\Picacho\Updated FCPCMP 10-27-2010\Editable Files\PIC-TOC.DOC; 3/1/2011 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 ENVIRO NMENTAL 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

### FINAL CLOSURE AND
POST-CLOSURE MAINTENANCE PLAN

FOR THE
PICACHO CUT AND FILL SITE

TABLE OF CONTENTS

SECTION PAGE

PCFS FCPCMP ii BRYAN A. STIRRAT & ASSOCIATES C:\Documents And Settings\Pwcomputerroom\My Documents\ Solid Waste\Picacho\Updated FCPCMP 10-27-2010\Editable Files\PIC-TOC.DOC; 3/1/2011 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 Dr ainage Control System 3-12

3.7.2 Soil Loss Analysis 3-12
3.7.3 Erosion Control 3-13

3.8 Landfill Gas Control/Migrat ion 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/Deco mmissioning 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 Migrati on Monitoring Procedures 4-2 4.3.2 Landfill Gas Migrati on 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 M onitoring Procedures 4-5

### FINAL CLOSURE AND
POST-CLOSURE MAINTENANCE PLAN

FOR THE
PICACHO CUT AND FILL SITE

TABLE OF CONTENTS

SECTION PAGE

PCFS FCPCMP iii BRYAN A. STIRRAT & ASSOCIATES C:\Documents And Settings\Pwcomputerroom\My Documents\ Solid Waste\Picacho\Updated FCPCMP 10-27-2010\Editable Files\PIC-TOC.DOC; 3/1/2011 4.4.2 Groundwater Monitori ng Evaluation and Reporting 4-6
4.4.3 Groundwater Monitori ng Systems Maintenance 4-10

4.5 Final Cover Inspection and Maintenance 4-11

4.5.1 Periodic Leak Search/Identif ication 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 Syst em Features Maintenance 4-14 4.8.2 Downdrains, Drainage C hannels, 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 Em ergency Response Plan 5-6

### FINAL CLOSURE AND
POST-CLOSURE MAINTENANCE PLAN

FOR THE
PICACHO CUT AND FILL SITE

TABLE OF CONTENTS

SECTION PAGE

PCFS FCPCMP iv BRYAN A. STIRRAT & ASSOCIATES C:\Documents And Settings\Pwcomputerroom\My Documents\ Solid Waste\Picacho\Updated FCPCMP 10-27-2010\Editable Files\PIC-TOC.DOC; 3/1/2011 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 Pl ans 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

### FINAL CLOSURE AND
POST-CLOSURE MAINTENANCE PLAN

FOR THE
PICACHO CUT AND FILL SITE

TABLE OF CONTENTS

PCFS FCPCMP v BRYAN A. STIRRAT & ASSOCIATES C:\Documents And Settings\Pwcomputerroom\My Documents\ Solid Waste\Picacho\Updated FCPCMP 10-27-2010\Editable Files\PIC-TOC.DOC; 3/1/2011 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 R equest – Modified List of Detection Monitoring Parameters

### FINAL CLOSURE AND
POST-CLOSURE MAINTENANCE PLAN

FOR THE
PICACHO CUT AND FILL SITE

TABLE OF CONTENTS

PCFS FCPCMP vi BRYAN A. STIRRAT & ASSOCIATES C:\Documents And Settings\Pwcomputerroom\My Documents\ Solid Waste\Picacho\Updated FCPCMP 10-27-2010\Editable Files\PIC-TOC.DOC; 3/1/2011 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)