Permeable Barriers for Groundwater Remediation: Design, Construction, and Monitoring
Arun R. Gavaskar
Battelle Press, 1998 - Technology & Engineering - 176 pages
Because of the limitations of conventional pump-and-treat systems in treating groundwater contaminants, permeable barriers are potentially more cost-effective than pump-and-treat systems for treating dissolved chlorinated solvent plumes, which may persist in the saturated zone for several decades. Other contaminants, such as chromium or other soluble heavy metals, can also be treated with this technology. Permeable Barriers for Groundwater Remediation discusses the types of permeable barriers, their design and construction, and how they can be monitored to evaluate compliance. It provides practical guidance on reactive media selection, treatability testing, hydrogeologic and geochemical modeling, and innovative installation techniques for the evaluation and application of this promising new technology. The types of permeable barriers discussed include: trench-type and caisson-based reactive cells; innovative emplacements, such as horizontal trenching and jetting; and continuous reactive barriers versus funnel-and-gate systems.
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MODELING TO SUPPORT THE PERMEABLE
flowpaths for 180 days
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aquifer conductivity aquitard backfill backhoe Battelle bentonite caisson calculated capture zone width carbon characterization chemical chlorinated clamshell column tests concentrations configuration contaminants cost depth determined discharge downgradient emplacement techniques Environmental estimate evaluate excavation feet Figure flow system flow velocity flowpath forward modeling ft/d ft/day funnel walls funnel-and-gate system gate geochemical modeling Gillham granular iron groundwater flow model groundwater velocity grout heterogeneous hydraulic capture zone hydraulic conductivity hydraulic heads impermeable increase injected installation inverse modeling locations metal mg/L microbial modeling codes MODFLOW Moffett Federal Airfield monitoring parameters pea gravel performance permeable barrier permeable barrier application permeable barrier design permeable barrier system plume porosity potential precipitate pumping tests reaction reaction-transport models reactive cell reactive medium redox reduced residence samples sediments sheet piles simulated slug tests slurry walls soil subsurface surface trench U.S. Geological Survey upgradient vertical water-level Waterloo Hydrogeologic
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