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New Keystone XL Route Could Still Threaten Ogallala Aquifer

Map used to define Nebraska Sandhills doesn't include nearby areas also vulnerable to contamination, InsideClimate News has learned.

Mar 14, 2012
Nebraska Sandhills region

"A relatively modest jog around the Sandhills"—that's how one TransCanada executive describes the Keystone XL oil pipeline's new route through Nebraska, which is expected to be released in the next few weeks.

But while the path will avoid the Nebraska Sandhills—a region of grass-covered sand dunes that overlies the critically important Ogallala aquifer—it could still pass through areas above the Ogallala, where the water supply is vulnerable to the impacts of an oil spill.

The original Keystone XL would have crossed through 100 miles of the Sandhills on its way from the tar sands mines of Alberta, Canada to refineries on the U.S. Gulf Coast. But TransCanada agreed to reroute it in November, after thousands of Nebraskans joined environmentalists to protest the pipeline's path over the aquifer.

The aquifer spans eight states and supplies 83 percent of Nebraska's irrigation water. It's also connected to the High Plains aquifer, which in many places lies above the Ogallala aquifer. Although residents of the Sandhills technically rely on the High Plains aquifer for drinking and irrigation, most refer to the Ogallala aquifer when talking about their water supply.

"It was always about the water," said Amy Schaffer, a fifth-generation Nebraskan whose father runs a Sandhills ranch. "This isn't over until they get [the pipeline] out of the Ogallala aquifer."

Depth to water map of eastern Nebraska

**Click for PDF version of map**

After TransCanada agreed to move the Keystone XL out of the Sandhills, the Nebraska Department of Environmental Quality, or DEQ, chose a 2001 map called "Ecoregions of Nebraska and Kansas" to show the area the pipeline must avoid.

The map delineates the borders of the Sandhills, but scientists say it's a general-use map designed for ecosystem management. When it comes to groundwater and an area's vulnerability to an oil spill, the map doesn't encompass all the sensitive regions.

"I think if you're protecting the ecological aspects of the Sandhills, the boundary we have is probably better than any of the other [available maps]," said James Omernik, a retired EPA scientist who was one of the map's principal authors. "If you are more concerned about the water table or sandy [soil] or any other characteristic, then you might want to build a buffer around the Sandhills that would include the characteristic you're trying to protect."

TransCanada did not return calls for this article. But last week, Alex Pourbaix, president of TransCanada's energy and oil pipeline division, told reporters that the new route will add about 20 miles to the overall pipeline. That means the pipeline would run close to the edge of the Sandhills, through areas where scientists say the water table is high and the soil is sandy, just as it is in the Sandhills itself.

Schaffer says TransCanada's short detour isn't enough.

"If they're not going to be generous about the Sandhills boundary," we're going to continue to protest, she said. "TransCanada is putting in as little effort as they can. They're not taking our water and land seriously."

John Bender, a water quality standards coordinator at the Nebraska DEQ, said the ecoregions map is just the first step of the rerouting process. Now that the agency has identified the Sandhills, he said it's up to TransCanada to "come up with something that's as far away from [the Sandhills] as possible while still meeting their needs."

Landowners, DEQ Disagree on Sandhills Map

Although TransCanada has been tight-lipped about the new route, company spokesman Shawn Howard has said in previous interviews with InsideClimate News that the reroute will affect only Nebraska. That means the pipeline would still cross the South Dakota/Nebraska boundary at the original entry point in eastern Keya Paha County. From there, it would have to go east, because moving it west would take it further into the Sandhills.

If only 20 miles are being added to the route, the pipeline will likely run southeast through northern Holt County. That area is part of the northwestern glaciated plains, an ecoregion east of the Sandhills. The water table there is so high that in the spring, the groundwater often rises enough to flood some fields with standing water.

NebraskaDepthtoWaterMap_INSIDECLIMATENEWS.pdf166.81 KB
EcoregionsOfNebraskaAndKansasMap_front.pdf3.58 MB
EcoregionsOfNebraskaAndKansasDetails_back.pdf100.89 KB
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