Design of a permeable reactive barrier in situ remediation system, Vermont site
- EMCON, Burlington, VT (United States)
- EMCON, Burbank, CA (United States)
EMCON designed a Permeable Reactive Barrier (PRB) for a site in Vermont to passively remediate in situ groundwater impacted with chlorinated volatile organic compounds (CVOCs). The PRB was selected over more conventional remediation approaches because it is a potentially low maintenance and long lasting solution for containment of groundwater impacts. Iron media are used as an agent to produce reductive dehalogenation reactions that break down the CVOCs. At the Vermont site, impacted groundwater is found from approximately 1.3 to 4.3 meters (4 to 14 feet) below ground surface in the uppermost aquifer, which is underlain by a silty clay aquitard. These are virtually optimum conditions for the implementation of this kind of technology. Effective design of the PRB required site specific hydrogeologic, geochemical, and geotechnical data, a substantial amount that was already available and some which was collected during the recent Corrective Action Feasibility Investigation (CAFI). Most PRBs have been constructed using sheet pilings to shore excavations backfilled by iron filings. On the Vermont project, continuous trenching is proposed to install HDPE sheeting for the funnel and alternative reactive media may be used in the reactive gates. The Funnel and Gate{trademark} system is being designed to regulate flow velocity through the gate to yield critical contact time between the CVOCs and the reactive media.
- OSTI ID:
- 567778
- Report Number(s):
- CONF-971032--
- Country of Publication:
- United States
- Language:
- English
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