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Considerations for Solar PV Installation on Closed Landfills

This document by Gary Garfield, PE, LSP from URS Corporation discusses the potential of utilizing closed landfills as sites for renewable energy generation through solar photovoltaic (PV) installations. It highlights key factors affecting installation, including racking and anchoring systems, slope and settlement concerns, and landfill gas extraction equipment. Visual landscapes may need adjustments for erosion control, while components such as drainage systems and vegetative covers are critical for sustainability. This resource underscores the importance of thoughtful planning and engineering in the integration of solar PV on underutilized landfill sites.

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Considerations for Solar PV Installation on Closed Landfills

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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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