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Landfill Installation Considerations – Solar PV

Renewable Energy @ Closed Landfills. Landfill Installation Considerations – Solar PV. By: Gary Garfield, PE, LSP URS Corporation Salem, New Hampshire. Landfills: An Underutilized Resource. Typical Landfill Cap. Flexible Installations. Rigid Installation.

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Landfill Installation Considerations – Solar PV

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  1. Renewable Energy @ ClosedLandfills Landfill Installation Considerations – Solar PV By: Gary Garfield, PE, LSP URS Corporation Salem, New Hampshire

  2. Landfills: An Underutilized Resource

  3. Typical Landfill Cap

  4. Flexible Installations

  5. Rigid Installation

  6. Rigid Installations

  7. Flexible vs. Rigid Panel Installation

  8. Factors to Consider • Racking Systems • Anchoring Systems • Side and Top Slopes • Settlement • Landfill Gas Extraction Equipment • Erosion and Vegetative Cover

  9. Racking Systems • Need to be elevated if installed on vegetative support layer • Need to be adjustable • Can be at grade if installed on stone layer

  10. Anchoring System • BallastSystem • Auger System

  11. Slope Considerations • 2% to 5% slopes preferred over 3:1 slopes • If placement is on side slope you need to consider slope stability • Static & Dynamic Loading • Snow and Ice loading • Side Slope Repairs • Side slope placement usually has less exposure time

  12. Settlement Consideration • Landfills are heterogeneous • Differential settlement will occur • Mitigation can include: • Use of geotextile or geonet reinforcement under stone dust or crushed stone • Use of Adjustable Racking Systems • Use of Shims

  13. Erosion Control • Changing the landfill surface changes surface water drainage capacity of: • Drainage Swales • Down Chutes • Mid-Slope Berms • Access Road Ditches • Toe Drains • Detention Basins

  14. Surface Cover • Crushed Stone • Kill vegetation • Apply geotextile • ¾ to 1 ½ inch stone • Grassy Cover • Mowing considerations • Insects • Healthy vegetative cover

  15. LFG System Considerations • LFG equipment maintenance • Subsurface LFG equipment includes • Header lines • Drip Legs • Blanket Drains • Sumps

  16. Thank You

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