Invited Session: Climate Change
Reducing Our Carbon Footprint with Exposed Geosynthetic Cover Systems (0.5 CEU)
Tuesday, September 26, 2017
15:30 – 16:00
Moderator: Cristina Polsgrove, Public Information Officer, City of Tucson, Arizona
An exposed geosynthetic cover system (EGCS) is an earth-friendly and economical alternative to a conventional soil closure of a landfill. Use of these systems results in a reduced carbon footprint improved downstream water quality and financial benefits for the owner. A conventional soil cover system consists of a gas relief layer + geomembrane + geocomposite + cover soil. In contrast, an EGCS consists of a gas relief layer + high-quality geomembrane or a gas relief layer + composite synthetic turf system. EGCS eliminates mining of cover soil and clear cutting of cover soil mining sites. There are no emissions from trucking cover soil to the site or from equipment used to spread cover soil. Ongoing maintenance of a conventional soil cover system involves frequent mowing, creating emissions in perpetuity, which is unnecessary with the EGCS. An EGCS also allows for an excellent method of greatly reducing the emissions of landfill gas since landfill gas (a major carbon source) is collected in a gas collection system underneath the impermeable ECGS. By designing landfills with earth-friendly alternatives at each phase of the project, we can contribute to the reduction of our carbon footprint.
By attending this presentation, the audience will understand the environmental and economic advantages to using an exposed geosynthetic cover system.