This decree belongs where those PCBs are buried in the silt of the Hudson.
At the bottom, Mr Cameron encountered incredibly fine silt, which he had to be careful not to disturb.
But as the water recedes it has left all the silt and sand and debris.
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Work has begun on removing several tonnes of silt from the River Nene in Northamptonshire.
The silt will be removed from the river using an excavator on a barge.
You don't have the border barge traffic kicking up the sand and the silt.
The river swirls away, white-crested and silt-laden, racing to the nearby border with Pakistan.
The cassiterite makes up some fraction of the standard sand and river silt there.
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The Canal and River Trust said silt would be "hoovered" up from the bottom of the docks.
More often than not, a bilateral deal unblocks one trade route only to silt up its tributaries.
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Silt curtain: fine, meshed material suspended in the water to prevent silt escaping from a construction site.
Dredging: excavation, digging, scraping, draglining, suction dredging to emove sand, silt, rock or other underwater sea-bottom material.
The entire Marina Beach resembles a graveyard, strewn with debris, silt and fish.
Egypt, for instance, seems to be stuck with the catastrophic Aswan dam, which is holding back the Nile's silt.
Because of low water levels and the harbors filing with silt, it can only carry 58, 000 tons, he said.
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Already, as the waters recede, Mozambican peasants have been rushing back to plant beans and maize in the silt.
Dig up, suck up, that sand and silt then separate the heavier cassiterite from the lighter sand and silt.
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Levees and navigation channels now funnel silt past the wetlands, which have shrunk by 2, 000 square miles in a century.
Their underground metamorphosis is slow and depends on minerals in the silt seeping into the skeletal structure, where they gradually solidify.
Ten years ago this creek was a mess, choked with silt and overflowing its undefined banks, a casualty of careless grazing.
And you do share his wonder at first catching sight of the ship, now half-buried in silt and shrouded in rusticles.
And those few larvae that were lucky enough to live long enough to extend a probing foot too often found only silt.
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The Salton Sea is shallow just 50 feet (15 metres) at its deepest point so a small drop in volume exposes a lot of silt.
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Restoring the water-retaining capacity of hydro-electric dams by regular dredging and sand and silt removal is the only way left before the authorities.
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Plans to clear silt from Gloucester Docks, using a new type of dredging, have been welcomed by organisers of the city's Tall Ships Festival.
The fish and a large amount of silt were found in the stream about a mile from Brecon at around 13:30 GMT on Friday.
Silt from the Mississippi replenished the marsh areas, but after levees were built to stop flooding, those muddy waters went out into the Gulf.
The river is a khaki-colored wash of silt and snowmelt that flows out of the mountain range to the north, past mud-walled family compounds.
Flooding last year may have worsened the situation on the Mississippi by leaving deposits of silt and debris in areas that would normally be clear.
The study showed that females, which were bigger and had longer bills, were able to peck deeper into the silt for prey than the shorter-billed males.
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