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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.

Temporary EGCs Overview

• Where → Future Filling

• Who → Is This You?

• When → ~10 Years

• What → EGC

• Why → Benefits

• How → Case Study

© 2015 Cornerstone. All rights reserved. 2

Where → Future Filling

• Potential Landfill Expansion

• Operational Flexibility


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?


When →

10+/- years


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

What → Temporary EGC

• Materials

• fPP (reinforced)

• HDPE

• LLDPE

• TPO (reinforced)

• EPDM Rubber

• Thickness

• 35 mil – 60 mil


What → Temporary EGC+

• Turf Cover: VersaCap (AGRU)


Why Use an EGC?

• [picture? From don’s]


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


Temporary EGC Benefits – Maintenance

• Compared to Soil

• No vegetation

• No soil erosion

• Visualization of issues

• Tears

• Defects

• Ponding


Temporary EGC Benefits – Operations

• Minimize Stormwater Infiltration

→ Reduce Leachate Generation


Temporary EGC Benefits – Operations

• Maximize LFG Collection

• Better odor control

• Beneficial use

• Reduced ambient air intrusion

• Reduced GHG emissions


How? EGCs historically looked like this…


Or this…


Which resulted in this…


Or this…


Now They Look Like This:

• [Pictures of Finished Construction]


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




10.5 Acres

Design Considerations

• Wind Uplift

→ Anchor Trenches


What → Temporary EGC+

• Wind Defender



• 100% of Precipitation = Stormwater to be Managed

→ Infrastructure sizing



• LFG → Active Collection System


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


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


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


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)


No Angry Neighbors → Priceless


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!


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


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