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OUTLINE

OUTLINE. Definitions Examples of Landfills in the Valley Construction on Landfills Materials Placement in Landfills Developments on Landfills – why develop landfills ?? Concerns Associated with Development on Landfills Landfill Materials Investigation

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OUTLINE

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  1. OUTLINE • Definitions • Examples of Landfills in the Valley • Construction on Landfills • Materials Placement in Landfills • Developments on Landfills – why develop landfills ?? • Concerns Associated with Development on Landfills • Landfill Materials Investigation • Remediation of Construction and Demolition (C&D) Landfills • Example Projects

  2. DEFINITIONS • MSW Landfill • C&D Materials • Inert Debris Landfill

  3. EXAMPLES OF LANDFILLS IN THE VALLEY • C&D Landfills • Mostly Along the Salt River, Aqua Fria, Gila River & Santa Cruz River • Created Generally by Mining of Aggregates for Concrete, Asphalt, and Base Course Materials • Pits Left Behind are Backfilled with MSW or C&D • 24th St Vulcan Materials, 28th St ( Dean Thomas Property), Salt River Pima Maricopa Dobson Plant • Tempe Market Place

  4. EXAMPLES OF LANDFILLS IN THE VALLEY • MSW Landfills • Queen Creek Landfill • 27th Ave Landfill • Tempe Municipal Landfill • Northwest Regional Landfill, and Others • Inert Debris Landfills • Salt River Materials Group Dobson Plant • 28th Street Landfill • 24th Street Landfill • Cotton Lane Landfill • Estrella Pit

  5. MATERILAS PLACEMENT IN LANDFILLS • No Compaction During C&D Disposals • No Processing is Completed • Creates Nesting of Large Particles • Blind Spots around Odd Shaped Particles • Organics • MSW Decomposes, Develops Settlement, LFG & Leachate

  6. MATERILAS PLACEMENT IN LANDFILLS

  7. DEVELOPMENTS ON THE LANDFILLS • Install Recreational Facilities • Low Load Bearing Structures on Compacted MSW, e.g. Distribution Center • Heavier Structures on MSW should be on Deep Foundations • Industrial and Commercial Developments on C&D

  8. CONCERNS ASSOCIATED WITH LANDFILL MATERIALS • Large Settlement • Uneven/Differential Settlements • Unpredictable – No Model Available on Stability • Compaction by Itself • Biodegradation • Piping, Internal Erosion and Raveling • Gas (LFG) and Leachate Production, Accumulation & Contamination of Air and Ground Water • Organics in C&D Takes Too Long to Decompose

  9. LANDFILL MATERIAL INVESTIGATION

  10. SOLUTIONS TO PROBLEMS FOR C&D LANDFILLS • Deep Dynamic Compaction (DDC) for Inert Debris Landfills • Compaction Grout • Vibrofloatation (Not Common) • Remove and Reconstruct w/ Engineered Fill/Debris

  11. Deep Dynamic Compaction (DDC) Tempe Market Place

  12. SOLUTIONS TO PROBLEMS FOR C&D LANDFILLS Deep Dynamic Compaction (DDC): • Effective up to 30’-35’ • 30-ton Load Drop from 80-90 feet Height, Multiple Times • Imparts approx. 150 ton-ft/sq.ft. Equivalent to 150% of Standard Proctor Compaction up to 25 Foot Depth • Evaluate Performance • Can’t Take Care of all Piping and Raveling

  13. 2000 4000

  14. Deep Dynamic Compaction

  15. 24th Street and Salt River– Vibration Monitoring

  16. Performance Evaluation with Plate Load Test

  17. SOLUTIONS TO PROBLEMS FOR C&D • Debris Fill Specifications • Anything as long as Inert Debris • 2 to 3 feet Lift Thickness • Compaction with 10 to 15 ton Equipment • 3 to 4 Passes with 20 to 30 hertz vibration • 30 to 60 Gallons/Cu.Yd. Water

  18. Debris Fill Specifications

  19. EXAMPLE PROJECTS • Tempe Market Place • 28th Street and Salt River • 24th Street and Salt River • 14th Street and River View Drive

  20. Tempe Market Place – Before Development

  21. Tempe Market Place – During Stabilization

  22. Tempe Market Place – After Development

  23. 24th Street & Salt River

  24. CONCLUDING REMARKS • Environmental Benefits • Aesthetic Improvement • Monetary Value Added • Land Use • Positive Economic Impact • Catalyst • Stops Illegal Dumping

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