Fracking Water Killed Trees, Study Finds

Green: Science

A study that argues for more research into the safe disposal of chemical-laced wastewater resulting from natural gas drilling found that a patch of national forest in West Virginia suffered quick and serious loss of vegetation after it was sprayed with hydraulic fracturing fluids.

The study, by researchers from the United States Forest Service, was published this month in the Journal of Environmental Quality. It said that two years after liquids were legally spread on a section of the Fernow Experimental Forest, within the Monongahela National Forest, more than half of the trees in the affected area were dead.

The researchers said that the disposal section was less than half an acre in size “to minimize the area of forest potentially affected by the fluid application.” About 75,000 gallons were applied over two days in June 2008.

The study’s author, Mary Beth Adams, a soil scientist, said that if the same amount had been spread over a larger area, less environmental damage to the forest would probably have been resulted.

She said that there was little information in the scientific literature about such impacts and that the study indicated that “there are potential effects of natural gas development that we didn’t expect.”

Several states allow disposal of drilling fluids on land and issue permits for this. The Fernow Experimental Forest, used for research by the Forest Service, is also the site of a drilling operation by Berry Energy. Dr. Adams said that while the government owned the surface rights to the forest, the sub-surface mineral rights are privately owned and available for natural gas exploration there and in other forest lands.

Although the exact composition of the fluids was not disclosed by the companies that manufactured them because they consider that information proprietary, her study noted, the main constituents appeared to be sodium and calcium chlorides because of their high concentrations on the surface soil.

Almost immediately after disposal, the researchers said, nearly all ground plants died. After a few days, tree leaves turned brown, wilted and dropped; 56 percent of about 150 trees eventually died.

The researchers said that studying ways to provide more protection to vegetation when drilling wastewater is disposed of, and developing a standard on doses of the wastewater, should be “a high priority.”