Pollution Engineering - November 2008 - (Page 62)

Advertorial HOWTO: Prevent Chemical Vapor Intrusion By REGENESIS B rownfield site development often requires a REMEDIAcontaminant vapor barrier to prevent volatile o r g a n i c con t a m i n a n t s in the subsurface from migrating into newly constructed buildings, potentially impacting indoor air quality. Historically, plastic sheet materials such as highdensity polyethylene (HDPE), known for its chemical resistance, have been applied as contaminant vapor barriers. The use of these materials, however, requires laborintensive cutting and seaming to ensure a continuous and cohesive barrier to vapor migration. This installation process can be intensive, difficult, and costly when applied to construction foundations with multiple penetrations (e.g. piping, electrical conduits). More recently, spray-applied asphalt/ latex membrane-type waterproofing materials have been widely promoted as a reasonable solution. While easy to apply and proven to retard water migration through concrete, the use of these asphalt/latex materials for repelling volatile organic compounds (VOCs), such as benzene and chlorinated solvents, may latex membranes. Geo-Seal™, a recently developed combe complicated by the affinity for contaminant vapors. It is widely recognized posite membrane system, offers exceptional that asphalt/latex-based products are, in chemical resistance for use as a gas vapor fact, highly susceptible to partitioning by barrier on construction sites with environVOCs, particularly chlorinated dry clean- mentally impacted soil and/or groundwater. ing-type solvents. This poses a concern This new technology was announced in a as the VOCs will partition into the mem- key platform presentation at the recent Sixth brane material itself potentially moving International Symposium on Remediation of through the vapor barrier over time and Chlorinated and Recalcitrant Compounds in impacting indoor air quality. Recently, a Monterey, Calif. Developed by Land Science new vapor barrier system has been developed and proven to resist such a parti- Technologies, a division of Regenesis, tioning effect and withstand contaminant Geo-Seal (patent pending) is the first permeation breakthrough for a period 18 vapor barrier technology to combine times longer than that of simple asphalt/ the durability and chemical resistance of two bonded HDPE layers with the ease and quality of installation found in a basic spray-applied asphalt/latex barrier. Geo-Seal is installed on-site prior to foundation construction. Data indicated that Geo-Seal was 645 percent more protective against volatile organic vapor transmission than commercially available spray-applied asphalt/latex products, with less than 0.16 the contaminant permeance, and resistance to contaminant permeation breakthrough for a period 18 times longer. For more information and/or a free cost estimate contact Regenesis at 949-366-8000 or visit www.regenesis.com. (949) 366-8000 • info@regenesis.com • www.regenesis.com 62 Pollution Engineering NOVEMBER2008 | HOWTO GUIDE http://www.regenesis.com http://www.regenesis.com http://www.regenesis.com

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Pollution Engineering - November 2008 Contents The Editor's Desk EnviroNews PE Events Legal Lookout Casebook Canada Environment Management The Green Files Waste Island Phase I ESAs and Vapor Intrusion Meeting the Mercury Target Wet ESPs - The Sky's the Limit Most Successful IFAT China Ever Thermoplastic to the Rescue Install a Trench Without Open Excavations Remediate Impacted Soils Without Accumulation of Metabolites Apply an Alternative to Wet ESP Solve These Common Pump Problems Minimize Risks Handling Ammonia Monitor International Regulatory Developments for Audits Skim Oil and Save Prevent Chemical Vapor Intrusion Spill Control and Containment Products Pumps and Systems Equipment PE Products Classified Marketplace Advertisers Index State Rules

Pollution Engineering - November 2008

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