Geocomposites Simplify Methane Barrier/Venting System Designby Josef J. Udwari, Managing Partner (Ltd.), United States,
Abstract: A case history describing the use of a geomembrane and geocomposite to simplify the design of a combined subsurface barrier and venting system is presented. The passive barrier and venting system represents the major component of a contingency plan prepared in response to a regulatory consent order to mitigate adverse effects on homeowners located adjacent to a closed debris landfill. The purpose of the passive system is to block potential subsurface methane migration from the landfill towards the homes by intercepting the gas as deep as 22 feet below ground surface, and venting it to the atmosphere under controlled conditions. Events leading to the system design, as well as site conditions affecting the selection of the geomembrane and geocomposite are summarized. Guidelines prepared to facilitate the successful installation of the methane barrier and venting system are also presented.
Subject Headings: Methane | Composite materials | Geomembranes | Case studies | Subsurface environment | Landfills | Debris | Site investigation
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