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The impermeable membrane is a thick plastic that can contain leaks.
BBC: Development challenge of Kazakhstan's giant oilfield
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Landfills without the benefit of a naturally impermeable layer use plastic liners and imported clay.
ECONOMIST: The charms of modern landfills
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Cement forms an extremely strong, effectively impermeable, seal from a thin slurry that can be pumped pretty easily anywhere, and is the ideal material for this purpose ( Cementing).
FORBES: The Fracking Solution Is A Good Cement Job
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The Times of London still sits behind an all-but-impermeable paywall, erected a year ago, that has not only devastated web traffic but coincided with a major drop in print circulation as well.
FORBES: The New York Post Gets a Paywall -- But Only on the iPad
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Gaby Mitchell, is set in rural Tennessee in the nineteen-thirties, and it looks a treat, down to the last button too much of a treat, perhaps, for what begins as a study of impermeable loneliness.
NEWYORKER: Get Low
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He says the Bakken has a layer of nearly impermeable shale that sits above the oil-bearing reservoirs.
FORBES: Focus
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But we'd like them to be applied in a way that makes them practically impermeable.
CNN: Oil spill from rig explosion at 5,000 barrels a day
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The landfill sits on a natural foundation of London clay which is more or less impermeable.
ECONOMIST: The charms of modern landfills
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The industry argues that this is highly unlikely, as the fraccing takes place a mile or more below drinking water aquifers and is separated from them by thick layers of impermeable rock.
FORBES: Daniel Yergin's The Quest: Human Ingenuity, Passion, the Fall of Caliphatism and the Rise of Prosperity