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OUTLINE Definitions Examples of Landfills in the Valley Construction on Landfills Materials Placement in Landfills Developments on Landfills – why develop.

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Presentation on theme: "OUTLINE Definitions Examples of Landfills in the Valley Construction on Landfills Materials Placement in Landfills Developments on Landfills – why develop."— Presentation transcript:

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 – 24 th St Vulcan Materials, 28 th 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 –27 th Ave Landfill –Tempe Municipal Landfill –Northwest Regional Landfill, and Others Inert Debris Landfills –Salt River Materials Group Dobson Plant –28 th Street Landfill –24 th 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-ton Load Drop from 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 –Cant Take Care of all Piping and Raveling

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14 Deep Dynamic Compaction

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16 24 th Street and Salt River– Vibration Monitoring

17 Performance Evaluation with Plate Load Test

18 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

19 Debris Fill Specifications

20 EXAMPLE PROJECTS Tempe Market Place 28 th Street and Salt River 24 th Street and Salt River 14 th Street and River View Drive

21 Tempe Market Place – Before Development

22 Tempe Market Place – During Stabilization

23 Tempe Market Place – After Development

24 24 th Street & Salt River

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


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