Due to its location in a seismic area, concerns over slope stability that could compromise gas collection and containment was a major concern for this landfill. The lack of quality borrow soil and the cost of procuring it meant installing a system on the existing fill’s landscape. Likewise, gas collection using deep wells would drastically increase installation costs and compromise speed of closure. A system that could perform effectively without wells was greatly advantageous.
ClosureTurf’s proprietary turf system eliminated the need for traditional gas wells or piping. This resulted in a cost savings of $15,000 per acre that would have been required for installing deep gas wells. ClosureTurf’s structured geomembrane component reduces oxygen in the system that results in higher quality methane gas being vented for flaring or alternative energy generation.
Under the ClosureTurf® system, the gas rises to the surface due to positive pressure and generates little condensate to be caught and managed. The Timber Ridge system is consistently venting 500 SCFM over a ten-acre closure with no vertical wells. This achievement has resulted in Timber Ridge winning an International Achievement Award for a combined gas collection and closure system and the Solid Waste Association of North America (SWANA) Gold Excellence Award for landfill gas collection in 2012.
“Capturing 100% of methane has provided options for carbon credits and given us more fuel to burn for generating energy. As soon as an area is closed, all emissions can be controlled which is great. And, the structured membrane protects against oxygen infiltration, eliminating that as a fire pathway.”
Mike Freisen , Regional Engineer IESI, A Progressive Waste Solution Company
- Project Name: TimberRidge Landfill
- Location: Richwoods, MO
- Completion Date: 2010
- Products Used: ClosureTurf®
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