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Building lifetime relationships
with our clients and employees.
Temporary Exposed Geomembrane Caps The Benefits Outweigh the Costs
May 4, 2015 © 2015 Cornerstone. All rights reserved.
Laura Hammerer Bodhi Piedmont-Fleischmann Mark Swyka, P.E.
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Temporary EGCs Overview
• Where → Future Filling
• Who → Is This You?
• When → ~10 Years
• What → EGC
• Why → Benefits
• How → Case Study
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Where → Future Filling
• Potential Landfill Expansion
• Operational Flexibility
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Who → Is This You?
• Mitigate Headaches
• Leachate treatment costs off the charts?
• Neighbors complaining about odors?
• And Reap Benefits
• Flexibility to recoup airspace?
• Increase LFG collection?
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When →
10+/- years
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6”
6”
24”
6” 12”
Barrier
Protection Soil
Barrier
Protection Soil
Vegetative Soil
Subgrade Subgrade
Geomembrane
Drainage,
Geomembrane &
Geocomposite
Intermediate Cover EGC Final Cover
> 30 days
Forever…
10+/- Years
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What → Temporary EGC
• Materials
• fPP (reinforced)
• HDPE
• LLDPE
• TPO (reinforced)
• EPDM Rubber
• Thickness
• 35 mil – 60 mil
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What → Temporary EGC+
• Turf Cover: VersaCap (AGRU)
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Why Use an EGC?
• [picture? From don’s]
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Temporary EGC Benefits – Construction
• Compared to Typical FC
• Faster & Cheaper
• No soil, drainage, or vegetation components
• Does not require permits or certifications
• No Soil Stability Issues
• Steeper slopes possible
• No need to establish vegetation
• Deconstruction
• Easier to remove for future filling
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Temporary EGC Benefits – Maintenance
• Compared to Soil
• No vegetation
• No soil erosion
• Visualization of issues
• Tears
• Defects
• Ponding
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Temporary EGC Benefits – Operations
• Minimize Stormwater Infiltration
→ Reduce Leachate Generation
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Temporary EGC Benefits – Operations
• Maximize LFG Collection
• Better odor control
• Beneficial use
• Reduced ambient air intrusion
• Reduced GHG emissions
© 2015 Cornerstone. All rights reserved. 12
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How? EGCs historically looked like this…
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Or this…
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Which resulted in this…
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Or this…
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Now They Look Like This:
• [Pictures of Finished Construction]
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Sussex County Sanitary Landfill, NJ
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Sussex County Sanitary Landfill, NJ
• Permit Application for 5.3 Million Cubic Yard
Horizontal and Vertical Expansion
• Add approximately 42 years of landfill life
• Temporary cap on approximately 10.5 acres of
existing landfill
• EGC Design Life → 10+ Years Until Expansion
• 40 mil HDPE EGC
• Constructed Fall 2014
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Sussex County Sanitary Landfill, NJ
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10.5 Acres
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Design Considerations
• Wind Uplift
→ Anchor Trenches
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What → Temporary EGC+
• Wind Defender
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Design Considerations
• 100% of Precipitation = Stormwater to be Managed
→ Infrastructure sizing
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Design Considerations
• LFG → Active Collection System
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Leachate Cost Savings at Sussex County
• Construction Cost → $660,000 Total
• Approximately $63,000 / acre installed
• (Excluding subgrade preparation and stormwater features)
• Savings in Leachate Treatment Cost
• Predict 1,200 gallons / acre-day reduction
• Transportation and disposal costs to the wastewater
treatment plant → $0.036 / gallon
• $15,800 / acre-year estimated savings
© 2015 Cornerstone. All rights reserved. 24
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Leachate Cost Savings at Sussex County
• Capital Expense → $63,000 / acre
• Annual Savings → $15,800 / acre
Payback Period → ~ 4 Years
• EGC design life of 10+ years → savings of
~$100,000 / acre in leachate disposal costs alone
• Savings increase with rising leachate disposal costs
© 2015 Cornerstone. All rights reserved. 25
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What Changed at Sussex Already??
• Projected ~ 5.5 Million Gallon Annual Reduction in
Leachate Generation Based on Q1 Data
• Savings of $195,000 in 2015 from Disposal Costs
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Increased LFG Recovery
• Intermediate Soil Covers Capture Approximately 75%
• EGCs Capture Approximately 95%
20% Increase
in LFG Collection
• Electricity Generation
• $50+/mwh
• Compressed Natural Gas (CNG)
• ~$2.00/gallon of gasoline equivalent (GGE)
© 2015 Cornerstone. All rights reserved. 27
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No Angry Neighbors → Priceless
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Conclusions
• Operational Benefits & Savings
• Reduce leachate and associated treatment cost
• LFG beneficial use
• Potential to reduce odor issues
• Design Considerations
The Benefits Outweigh the Cost!
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Thank you
Laura Hammerer (845) 695-0277 [email protected] Bodhi Piedmont-Fleischmann (845) 695-0238 [email protected] Cornerstone Environmental Group 100 Crystal Run Road, Suite 101 Middletown, NY 10941
© 2015 Cornerstone. All rights reserved. 30