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John Carrigan MassDEP Northeast Regional Office

Renewable Energy at Closed Landfills Workshop: Landfill Post Closure Use Critical Components July 26, 2012. John Carrigan MassDEP Northeast Regional Office. Critical Application Components. What the DEP permit reviewer will be most focused on: Foundations Storm Water Controls

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John Carrigan MassDEP Northeast Regional Office

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  1. Renewable Energy at Closed Landfills Workshop: Landfill Post Closure Use Critical ComponentsJuly 26, 2012 John Carrigan MassDEP Northeast Regional Office

  2. Critical Application Components • What the DEP permit reviewer will be most focused on: • Foundations • Storm Water Controls • Long-Term Maintenance

  3. Foundations • Must not compromise the function and integrity of the landfill cap/final cover system: • Keep water out, • Management of storm water runoff, and • Keep landfill gas in. • Must be structurally stable and accommodate loading/settlement.

  4. Landfill Gas Control and Monitoring Plan • Address Impact of Facility Design on Landfill Gas Controls and of Landfill Gas on the Facility • Design criteria • Public Health (toxic compounds in ambient) • Safety (explosion, fire, asphyxiation) • Welfare (nuisance odors) • Landfill Gas Control and Risk Reduction Methods • Engineering • Management controls • Monitoring

  5. Geotechnical Analysis – Settlement & Stability • Demonstrate No Adverse Impact to Final Cover and Design is Structurally Stable • Site/Design Specific Geotechnical/Stability Analysis • Pre and Post Construction Monitoring

  6. Stormwater Controls • Consider: • the foundation design and density of development. • location and orientation of power lines from development. • Will these factors concentrate runoff and erosion potential or create water bars? • Design for the 24-hour, 25 year storm event. • Evaluate flooding potential from the 24-hour, 100 year storm event.

  7. Long-Term Maintenance • Maintenance ensures the continued functionality of the cap/final cover system and all of its components. • Designed well: Maintenance should be minimal. • Designed poorly: may need efforts to address instability, frequent erosion/cap repairs, and/or labor intensive vegetation control.

  8. Post Closure Monitoring & Maintenance Plan • Inspections • professional engineer or qualified professional • problems noted & scheduled for follow-up attention • Routine Monitoring and Repairs • mowing, removing brush and trees, reseeding • storm water • landfill gas collection system • leachate collection system • environmental monitoring system • Post Closure Monitoring • evaluate effectiveness of final cover system • post closure use areas

  9. IT’S NOT ROCKET SCIENCE Design Considerations • Impact of the Facility on the Landfill • Integrity and Function of the Cap, Landfill Gas and Storm Waster Controls • Impact of the Landfill on the Facility • Post-Closure Operation, Monitoring, and Maintenance of the Landfill including the Facility

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