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Presented By _______________________________________ Patrick S. Sullivan, R.E.A., C.P.P.

Landfill Management Practices for Reducing GHG Emissions CIWMB Strategic Policy Development Committee Public Workshop May 8, 2007 Sacramento, CA. Presented By _______________________________________ Patrick S. Sullivan, R.E.A., C.P.P. Outline of Presentation. Early Installation of LFG System

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Presented By _______________________________________ Patrick S. Sullivan, R.E.A., C.P.P.

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  1. Landfill Management Practices for Reducing GHG EmissionsCIWMBStrategic Policy Development Committee Public Workshop May 8, 2007Sacramento, CA Presented By _______________________________________ Patrick S. Sullivan, R.E.A., C.P.P.

  2. Outline of Presentation • Early Installation of LFG System • Maximizing LFG Design • Landfill Design/Operational Practices • Enhanced Monitoring

  3. Early Installation of LFG System • Use of LCRS for LFG Collection • Horizontal Collectors in Early Lifts of Waste • Earliest Possible Vertical Wells • Monitor and Collect When Sufficient Quantity (Pressure) Available • Obstacles • Low Gas Quality and Quantity • Significant Air Intrusion • Lack of BTUs for Combustion of Methane

  4. Maximizing LFG Design • Early Installation as Previous • Tighter Well Spacing---conservative radius of influence calculations • Dual Wells for Greater Vertical Coverage • Adequate Control and Backup Capacity • Maximize Blower Sizing and Include Redundancy • Maximize Pipe Sizing

  5. Maximizing LFG Design (cont.) • Maximize Borehole and Well Diameter • Use Combination of Vertical and Horizontal Wells Strategically • Limit Well Extensions Before Additional Well Installation • Increase Automation to Minimize Downtime • Use of VFD Blowers to Control Vacuum

  6. Maximizing LFG Design (cont.) • Design for Ease of Expansion • Design Include Collection from LCRS When Gas is Found • Enhanced Waste Degradation (bioreactor or leachate recirculation) means Enhanced LFG Collection • Looped Piping System for Multi-Directional Connection to Wells

  7. Landfill Design/Operational Practices • Design LFG Collection Component in Bottom Liner System • Seal Liner Anchor Trench • Improve Daily Cover Practices; Upgrade to Intermediate ASAP • ADC Must Provide Comparable LFG Barrier to Soil • Earliest Possible Final Cover System • Partial Final Cover if Entire Site Possible

  8. Landfill Design/Operational Practices (cont.) • Use of Biologically Active Covers • Avoid Cover Penetration When Possible and Seal Around Cover Penetrations • Landfill Expansion Design to Accommodate Gas Collection • Sequence Operations to Avoid Damage or Impact to LFG Systems

  9. Enhanced Monitoring • More Stringent Performance Standard for Surface Emissions (vs. 500 ppm) • More Frequent Monitoring (vs. quarterly) • Other Forms of Monitoring • Integrated Surface Sampling • Remote Sensing • Flux Chambers • Metric for Measuring Increase Performance ?

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