Mining and Drilling

December 20, 2013

WI Mining Company Fined

Read here about a mining company in Wisconsin that has been fined $200,000 in a 2011 pollution case.

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December 4, 2013

Gas Drilling Slows in PA City

Read here about a Pennsylvania city where the pace of gas drilling is slowing.…

April 5, 2013

Wildlife in NE Threatened by Drilling

Read here about how wildlife in the Northeast is being threatened because of the gas drilling boom.

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December 21, 2012

Request Made to Open Files on Drilling Suit

Read here about a hearing date that has been set as a result of a media request to open files related to a drilling lawsuit.

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December 17, 2012

Drilling – safe or dangerous?

Read here about the debate over whether gas drilling is safe or dangerous.

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January 25, 2012

NY takes action against Pa. driller over pollution

Read here about fines being sought from a Pennsylvania drilling company for polluting a stream.…

October 12, 2011

Mining Co to Pay Government to Settle Clean up

Read here about an Idaho mining company that will pay millions to the federal government to settle the clean up of the Silver Valley.…

July 21, 2010

Camp Enhancement

Pollution Engineering (06/10) Vol. 42, No. 6, P. 31; Zeller, Stephen N.; Ambulkar, Archis

Dredging is the process of extracting sediment material from waterway beds, and common techniques of sediment removal from lakes include draining and excavating the lake, mechanical dredging, and hydraulic dredging. The hydraulic dredging process entails removing and transporting waterways material via sediment/water slurry, and it does not require water drawdown in the lake. Instead, the dredging equipment floats on the water surface and sucks up sediment/water slurry from the lake, conveying the slurry to an offsite location via centrifugal pumps. The process primarily involves a floating barge, dredge unit, pumps, and discharge line, and sediment removal can be carried out over an entire lake or from specific locations within the lakes. Camp Yolijwa in Newville, Pa., faced the buildup of organic sediment in Lake Henrietta, which was impacting the waterfront activities that campers enjoyed. The camp selected a geotextile or filter bags option to separate the water from the sediments; slurry was pumped into polypropylene filter bags, where sediment was trapped and water allowed to filter out through the polypropylene material. The dredged sediment material was disposed offsite following filtering. Some 7,000 cubic yards of dredge material from the lake bottom was removed, and the hydraulic dredging method used a pump to lift the material deposited on the lake bottom and pump it into large filter bags. Within a week or two, the material in the bags reached a texture comparable to wet topsoil and was transported by backhoe and dump truck, and bags were sited along the lake banks so that water returned to the lake as they drained. The dredged material was expected to be compacted to less than 50 percent of its original volume, and the contractor was able to pump the material to any location within an elevation of less than 25 vertical feet of the lake bottom at no extra cost.…